CN105536730A - Composite nano-adsorbent, and preparation method and application thereof - Google Patents
Composite nano-adsorbent, and preparation method and application thereof Download PDFInfo
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention provides a composite nano-adsorbent, and a preparation method and application thereof, belonging to the technical field of environmental functional materials. The preparation method uses P(HB-HO), CS, a pore-foaming agent and PVA as raw materials and comprises the following steps: dissolving P(HB-HO) in an organic phase; dissolving CS in an acetic acid solution, adding the pore-foaming agent, carrying out mixing and then carrying out high-speed homogenization so as to form primary emulsion; dissolving a part of PVA so as to obtain an aqueous PVA solution, then mixing the aqueous PVA solution with the primary emulsion, carrying out high-speed homogenization so as to obtain compound emulsion, carrying out full stirring so as to allow the organic phase to be volatilized, subjecting the compound emulsion to centrifugation, discarding a supernatant and collecting a precipitate; and dissolving the rest PVA to form another aqueous PVA solution, dispersing the collected precipitate in the aqueous PVA solution, carrying out oscillation overnight, washing out the residual pore-forming agent in the precipitate, carrying out high-speed centrifugation, collecting the precipitate and subjecting the collected precipitate to freeze drying so as to obtain the P(HB-HO)/CS composite nano-adsorbent. The composite nano-adsorbent prepared in the invention has the advantages of uniform particle size distribution, a good dispersion degree, a porous structure, good stability, no secondary pollution, capacity of simultaneously removing heavy metals and hydrophobic organic matters in sewage and improved treatment efficiency.
Description
Technical field
The invention belongs to environment functional material technical field, be specifically related to a kind of composite nano adsorbent and its preparation method and application.
Background technology
Water is one of the mankind's three large vital principles of depending on for existence.China's freshwater resources total amount is 28000 billion cubic meters, accounts for 6% of global water resources.But water resources ownership per capita only has 2300m
3, being only 1/4 of world average level, is one of whole world country that water resource is the poorest per capita.Along with industrialization develop rapidly and the level of urbanization improve constantly, water resource pollution is on the rise, and majority is the combined pollution combined by multiple pollutant.A large amount of synthesis of hardly degraded organic substance and discharge, containing the existence of heavy metal ion trade effluent, Heavy Metals in Waters-organic combined pollution is made to become a kind of commonplace phenomenon, the mud of such as sewage treatment plant, city domestic refuse percolation liquid, the pollution caused containing sewage such as agricultural chemicals runoff and coking, oil refining, plating and printing and dyeing industries are mostly heavy metal-organic matter combined pollution.The main rivers and lakes of China all in various degree be subject to heavy metal and organic pollution.These pollutant toxicity are large, distribution is wide, difficult degradation, easily put aside, and the destruction to ecological environment and the harm to human health are potential and huge.At present, can be used for heavy metal in water-organic compound contaminated Treatment process and comprise enhanced coagulation method, photochemical catalysis method, bioanalysis, embrane method and absorption method etc.Wherein, absorption method is because of heavy metal and gas chromatography adsorption efficiency is high, removal ability is strong, and sorbing material such as can to reuse at the advantage, is more and more subject to people's attention.Research shows, utilizes the pollutant in sorbing material (as activated carbon, resin, silica gel etc.) absorption effluent, is the processing method of a kind of high-efficient simple solving water environment pollution.
Shitosan (CS) is chitin deacetylase based products; it is a kind of positively charged natural polymer; there is the advantages such as good biological degradability, biocompatibility, non-secondary pollution, in field extensive uses such as medicine, chemical industry, food, environment.There is a large amount of free amine groups and hydroxyl in CS molecule, under certain pH, by hydrogen bond, coordinate bond or covalent bond and heavy metal ion etc., complexation reaction occurs, become the adsorbent of a kind of function admirable in sewage disposal.Hydroxybutyric acid and Hydroxyoctanoic acid EVA [P (HB-HO)] are a kind of novel polyhydroxyl alkanoic acids (PHAs), are the hydrophobic polymer polyester produced through fermentation mode by microorganism.This material has good physics characteristic (as thermoplasticity, piezoelectricity, optical activity, mechanics mechanical performance etc.) and excellent biological characteristics (as biodegradability, biocompatibility, catabolite nontoxicity and surface modificability etc.), has become one of important candidate material of current ecological environment material nd and bio-medical material.Existing poly butyric (PHB) is as the bibliographical information of the single organic matter of sorbent treatment water body (chlorobenzene or o-chloronitrobenzene), but the less (58.78m of the specific area of this adsorbent
2g
-1), reach adsorption equilibrium required time longer (36h), limited sorption capacity.
Summary of the invention
The object of the invention is the deficiency of the limited sorption capacity existed for above-mentioned existing adsorbent, a kind of composite nano adsorbent and its preparation method and application is provided.
For achieving the above object, the technical solution adopted in the present invention is: a kind of composite nano adsorbent, wherein: the matrix of following row parts by weight is raw material:
P (HB-HO) 3 ~ 30 parts, CS1 ~ 15 part, pore-foaming agent 5 ~ 30 parts, PVA11 ~ 25 part;
Described P (HB-HO) is hydroxybutyric acid and Hydroxyoctanoic acid EVA; Described CS is shitosan; Described PVA is polyvinyl alcohol.
Prepare a method for described composite nano adsorbent, wherein: comprise the following steps:
(1) P (HB-HO) of above-mentioned parts by weight is dissolved in organic phase, and described P (HB-HO) concentration in organic phase is 1 ~ 10%;
(2) again the CS of above-mentioned parts by weight is put into concentration be 2% acetum dissolve, then add above-mentioned parts by weight pore-foaming agent mixing after, high-speed homogenization 5 ~ 10min under the rotating speed of 10000 ~ 15000rpm, formed colostric fluid;
(3) first get the PVA of 1 ~ 15 part, be dissolved into the PVA aqueous solution that concentration is 0.1 ~ 1.5%, then after mixing with the colostric fluid that step (2) obtains, high-speed homogenization 5 ~ 10min under the rotating speed of 10000 ~ 15000rpm, forms double emulsion;
(4) double emulsion that step (3) is obtained is fully stirred 5 ~ 8h, organic phase is volatilized completely, makes double emulsion high speed centrifugation 10min under the rotating speed of 15000rpm, abandon supernatant, collecting precipitation thing;
(5) remaining PVA is dissolved into the PVA aqueous solution that concentration is 1%, the sediment that step (4) is collected is scattered in this PVA aqueous solution, shaken overnight, wash away the remaining pore-foaming agent in sediment, then under the rotating speed of 15000rpm after high speed centrifugation 10min, collecting precipitation thing, by the sediment freeze drier freeze drying 24h at the temperature of-50 DEG C collected, obtains P (HB-HO)/CS composite nano adsorbent.
Further preferred version, described organic phase is chloroform or carrene.
Described pore-foaming agent is any one in sodium chloride, sodium acid carbonate or hydrogen peroxide.
Composite nano adsorbent of the present invention is applied to simultaneously in absorption effluent in heavy metal and hydrophobic organic compound.
Compared with prior art, have the following advantages: the first, the present invention is using CS and P (HB-HO) as main carriers, and bi-material is all easy to get, and cost is lower, degradable.The second, the present invention has adopted emulsion homogenate legal system for P (HB-HO)/CS composite nano adsorbent, and this nano adsorber domain size distribution is homogeneous, and good dispersion degree, has loose structure, and stability is better, non-secondary pollution.3rd, the free amine group of CS molecule in adsorbent of the present invention, hydroxyl can with heavy metal ion generation complexation reaction, P (HB-HO) has extremely strong hydrophobicity, confirm through adsorption test, the good adsorbent performance of CS heavy metal is combined to the distinctive affinity of hydrophobic organic compound with P (HB-HO), the heavy metal in sewage and hydrophobic organic compound can be removed simultaneously, substantially increase the treatment effeciency to combined pollution in sewage.
Accompanying drawing explanation
Fig. 1 is the scanning electron microscope (SEM) photograph of P (HB-HO)/CS composite nano adsorbent.
Fig. 2 is the grain size distribution of P (HB-HO)/CS composite nano adsorbent.
Detailed description of the invention
Embodiment 1:
A kind of composite nano adsorbent of the present embodiment, wherein: the matrix of following row parts by weight is raw material:
P (HB-HO) 3 parts, CS1 part, 30 parts, sodium chloride, PVA11 part;
Described P (HB-HO) is hydroxybutyric acid and Hydroxyoctanoic acid EVA; Described CS is shitosan; Described PVA is polyvinyl alcohol.
Prepare a method for described composite nano adsorbent, wherein: comprise the following steps:
(1) P (HB-HO) of above-mentioned parts by weight is dissolved in carrene, and described P (HB-HO) concentration in carrene is 1%;
(2) again the CS of above-mentioned parts by weight is put into concentration be 2% acetum dissolve, then add above-mentioned parts by weight sodium chloride mixing after, high-speed homogenization 5min under the rotating speed of 15000rpm, formed colostric fluid;
(3) first get the PVA of 1 part, be dissolved into the PVA aqueous solution that concentration is 0.1%, then after mixing with the colostric fluid that step (2) obtains, high-speed homogenization 5min under the rotating speed of 15000rpm, forms double emulsion;
(4) double emulsion that step (3) is obtained is fully stirred 5h, carrene is volatilized completely, makes double emulsion high speed centrifugation 10min under the rotating speed of 15000rpm, abandon supernatant, collecting precipitation thing;
(5) remaining PVA is dissolved into the PVA aqueous solution that concentration is 1%, the sediment that step (4) is collected is scattered in this PVA aqueous solution, shaken overnight, wash away the remaining sodium chloride in sediment, then under the rotating speed of 15000rpm after high speed centrifugation 10min, collecting precipitation thing, by the sediment freeze drier freeze drying 24h at the temperature of-50 DEG C collected, obtains P (HB-HO)/CS composite nano adsorbent.
As depicted in figs. 1 and 2, this nano adsorber is spheroidal, and surface has loose structure, and domain size distribution is at about 250-350nm for the scanning electron microscope (SEM) photograph of P (HB-HO)/CS composite nano adsorbent and grain size distribution.
P (the HB-HO)/CS composite nano adsorbent prepared with embodiment 1 is to toluene, Cr
6+compound sewage carries out adsorption treatment.Take toluene and Cr that 0.5gP (HB-HO)/CS composite nano adsorbent is placed in 200mL, initial concentration is 50mg/L
6+mixed solution in, water bath with thermostatic control vibration 24h under the conditions of 30 DEG C and 150rpm, centrifugation also measures toluene (high performance liquid chromatography) and Cr in solution respectively
6+the concentration of (atomic absorption spectrophotometry).P (HB-HO)/CS composite nano adsorbent is to toluene and Cr
6+adsorption rate be respectively 96.36%, 98.97%.
In contrast, as adsorbent, adopt method same as described above to toluene, Cr 0.5gCS and P (HB-HO) intermingling material (ratio of weight and number of CS and P (HB-HO) is 1:3)
6+compound sewage carries out adsorption treatment.Intermingling material adsorbent is to toluene and Cr
6+adsorption rate be respectively 20.28%, 30.74%.
Result shows: prepared P (HB-HO)/CS composite nano adsorbent is to toluene, Cr
6+compound sewage adsorption effect is remarkable.Embodiment 2:
A kind of composite nano adsorbent of the present embodiment, wherein: the matrix of following row parts by weight is raw material:
P (HB-HO) 25 parts, CS15 part, sodium acid carbonate 6 parts, PVA15 part;
Described P (HB-HO) is hydroxybutyric acid and Hydroxyoctanoic acid EVA; Described CS is shitosan; Described PVA is polyvinyl alcohol.
Prepare a method for described composite nano adsorbent, wherein: comprise the following steps:
(1) P (HB-HO) of above-mentioned parts by weight is dissolved in carrene, and described P (HB-HO) concentration in carrene is 8.3%;
(2) again the CS of above-mentioned parts by weight is put into concentration be 2% acetum dissolve, then add above-mentioned parts by weight sodium acid carbonate mixing after, high-speed homogenization 6min under the rotating speed of 13000rpm, formed colostric fluid;
(3) first get the PVA of 5 parts, be dissolved into the PVA aqueous solution that concentration is 0.5%, then after mixing with the colostric fluid that step (2) obtains, high-speed homogenization 6min under the rotating speed of 13000rpm, forms double emulsion;
(4) double emulsion that step (3) is obtained is fully stirred 6h, carrene is volatilized completely, makes double emulsion high speed centrifugation 10min under the rotating speed of 15000rpm, abandon supernatant, collecting precipitation thing;
(5) remaining PVA is dissolved into the PVA aqueous solution that concentration is 1%, the sediment that step (4) is collected is scattered in this PVA aqueous solution, shaken overnight, wash away the remaining sodium acid carbonate in sediment, then under the rotating speed of 15000rpm after high speed centrifugation 10min, collecting precipitation thing, by the sediment freeze drier freeze drying 24h at the temperature of-50 DEG C collected, obtains P (HB-HO)/CS composite nano adsorbent.
P (the HB-HO)/CS composite nano adsorbent prepared with embodiment 2 is to naphthalene, Pb
2+compound sewage carries out adsorption treatment.Take naphthalene and Pb that 0.5gP (HB-HO)/CS composite nano adsorbent is placed in 200mL, initial concentration is 50mg/L
2+mixed solution in, water bath with thermostatic control vibration 24h under the conditions of 30 DEG C and 150rpm, centrifugation also measures naphthalene (high performance liquid chromatography) and Pb in solution respectively
2+the concentration of (atomic absorption spectrophotometry).P (HB-HO)/CS composite nano adsorbent is to naphthalene and Pb
2+adsorption rate be respectively 95.76%, 97.13%.
In contrast, as adsorbent, adopt method same as described above to naphthalene, Pb CS and P (HB-HO) intermingling material (ratio of weight and number of CS and P (HB-HO) is 3:5)
2+compound sewage carries out adsorption treatment.Intermingling material adsorbent is to naphthalene and Pb
2+adsorption rate be respectively 21.39%, 27.32%.
Result shows: prepared P (HB-HO)/CS composite nano adsorbent is to naphthalene, Pb
2+compound sewage adsorption effect is remarkable.
Embodiment 3:
A kind of composite nano adsorbent of the present embodiment, wherein: the matrix of following row parts by weight is raw material:
P (HB-HO) 12 parts, CS1 part, hydrogen peroxide 10 parts, PVA25 part;
Described P (HB-HO) is hydroxybutyric acid and Hydroxyoctanoic acid EVA; Described CS is shitosan; Described PVA is polyvinyl alcohol.
Prepare a method for described composite nano adsorbent, wherein: comprise the following steps:
(1) P (HB-HO) of above-mentioned parts by weight is dissolved in chloroform, and described P (HB-HO) concentration in chloroform is 4%;
(2) again the CS of above-mentioned parts by weight is put into concentration be 2% acetum dissolve, then add above-mentioned parts by weight hydrogen peroxide mixing after, high-speed homogenization 8min under the rotating speed of 12000rpm, formed colostric fluid;
(3) first get the PVA of 15 parts, be dissolved into the PVA aqueous solution that concentration is 1.5%, then after mixing with the colostric fluid that step (2) obtains, high-speed homogenization 8min under the rotating speed of 12000rpm, forms double emulsion;
(4) double emulsion that step (3) is obtained is fully stirred 7h, chloroform is volatilized completely, makes double emulsion high speed centrifugation 10min under the rotating speed of 15000rpm, abandon supernatant, collecting precipitation thing;
(5) remaining PVA is dissolved into the PVA aqueous solution that concentration is 1%, the sediment that step (4) is collected is scattered in this PVA aqueous solution, shaken overnight, wash away the residual hydrogen peroxide in sediment, then under the rotating speed of 15000rpm after high speed centrifugation 10min, collecting precipitation thing, by the sediment freeze drier freeze drying 24h at the temperature of-50 DEG C collected, obtains P (HB-HO)/CS composite nano adsorbent.
P (the HB-HO)/CS composite nano adsorbent prepared with embodiment 3 is to o-dichlorohenzene, Zn
2+compound sewage carries out adsorption treatment.Take o-dichlorohenzene and Zn that 0.5gP (HB-HO)/CS composite nano adsorbent is placed in 200mL, initial concentration is 50mg/L
2+mixed solution in, water bath with thermostatic control vibration 24h under the conditions of 30 DEG C and 150rpm, centrifugation also measures o-dichlorohenzene (high performance liquid chromatography) and Zn in solution respectively
2+the concentration of (atomic absorption spectrophotometry).P (HB-HO)/CS composite nano adsorbent is to o-dichlorohenzene and Zn
2+adsorption rate be respectively 96.10%, 98.69%.
In contrast, as adsorbent, adopt method same as described above to o-dichlorohenzene, Zn CS and P (HB-HO) intermingling material (ratio of weight and number of CS and P (HB-HO) is 1:12)
2+compound sewage carries out adsorption treatment.Intermingling material adsorbent is to o-dichlorohenzene and Zn
2+adsorption rate be respectively 19.91%, 28.38%.
Result shows: prepared P (HB-HO)/CS composite nano adsorbent is to o-dichlorohenzene, Zn
2+compound sewage adsorption effect is remarkable.
Embodiment 4:
A kind of composite nano adsorbent of the present embodiment, wherein: the matrix of following row parts by weight is raw material:
P (HB-HO) 24 parts, CS8 part, sodium acid carbonate 20 parts, PVA20 part;
Described P (HB-HO) is hydroxybutyric acid and Hydroxyoctanoic acid EVA; Described CS is shitosan; Described PVA is polyvinyl alcohol.
Prepare a method for described composite nano adsorbent, wherein: comprise the following steps:
(1) P (HB-HO) of above-mentioned parts by weight is dissolved in chloroform, and described P (HB-HO) concentration in chloroform is 8%;
(2) again the CS of above-mentioned parts by weight is put into concentration be 2% acetum dissolve, then add above-mentioned parts by weight sodium acid carbonate mixing after, high-speed homogenization 10min under the rotating speed of 10000rpm, formed colostric fluid;
(3) first get the PVA of 10 parts, be dissolved into the PVA aqueous solution that concentration is 1%, then after mixing with the colostric fluid that step (2) obtains, high-speed homogenization 10min under the rotating speed of 10000rpm, forms double emulsion;
(4) double emulsion that step (3) is obtained is fully stirred 8h, chloroform is volatilized completely, makes double emulsion high speed centrifugation 10min under the rotating speed of 15000rpm, abandon supernatant, collecting precipitation thing;
(5) remaining PVA is dissolved into the PVA aqueous solution that concentration is 1%, the sediment that step (4) is collected is scattered in this PVA aqueous solution, shaken overnight, wash away the remaining sodium acid carbonate in sediment, then under the rotating speed of 15000rpm after high speed centrifugation 10min, collecting precipitation thing, by the sediment freeze drier freeze drying 24h at the temperature of-50 DEG C collected, obtains P (HB-HO)/CS composite nano adsorbent.
P (the HB-HO)/CS composite nano adsorbent prepared with embodiment 4 is to luxuriant and rich with fragrance, Cd
2+compound sewage carries out adsorption treatment.Take phenanthrene and Cd that 0.5gP (HB-HO)/CS composite nano adsorbent is placed in 200mL, initial concentration is 50mg/L
2+mixed solution in, water bath with thermostatic control vibration 24h under the conditions of 30 DEG C and 150rpm, centrifugation also measures solution China and Philippines (high performance liquid chromatography) and Cd respectively
2+the concentration of (atomic absorption spectrophotometry).P (HB-HO)/CS composite nano adsorbent is to luxuriant and rich with fragrance and Cd
2+adsorption rate be respectively 97.71%, 97.99%.
In contrast, using CS and P (HB-HO) intermingling material (ratio of weight and number of CS and P (HB-HO) is 1:3) as adsorbent, adopt method same as described above to luxuriant and rich with fragrance, Cd
2+compound sewage carries out adsorption treatment.Intermingling material adsorbent is to luxuriant and rich with fragrance and Cd
2+adsorption rate be respectively 20.76%, 29.82%.
Result shows: prepared P (HB-HO)/CS composite nano adsorbent is to luxuriant and rich with fragrance, Cd
2+compound sewage adsorption effect is remarkable.
Embodiment 5:
A kind of composite nano adsorbent of the present embodiment, wherein: the matrix of following row parts by weight is raw material:
P (HB-HO) 5 parts, CS2 part, sodium acid carbonate 5 parts, PVA18 part;
Described P (HB-HO) is hydroxybutyric acid and Hydroxyoctanoic acid EVA; Described CS is shitosan; Described PVA is polyvinyl alcohol.
Prepare a method for described composite nano adsorbent, wherein: comprise the following steps:
(1) P (HB-HO) of above-mentioned parts by weight is dissolved in carrene, and described P (HB-HO) concentration in carrene is 1.7%;
(2) again the CS of above-mentioned parts by weight is put into concentration be 2% acetum dissolve, then add above-mentioned parts by weight sodium acid carbonate mixing after, high-speed homogenization 7min under the rotating speed of 11000rpm, formed colostric fluid;
(3) first get the PVA of 5 parts, be dissolved into the PVA aqueous solution that concentration is 0.8%, then after mixing with the colostric fluid that step (2) obtains, high-speed homogenization 7min under the rotating speed of 11000rpm, forms double emulsion;
(4) double emulsion that step (3) is obtained is fully stirred 6h, carrene is volatilized completely, makes double emulsion high speed centrifugation 10min under the rotating speed of 15000rpm, abandon supernatant, collecting precipitation thing;
(5) remaining PVA is dissolved into the PVA aqueous solution that concentration is 1%, the sediment that step (4) is collected is scattered in this PVA aqueous solution, shaken overnight, wash away the remaining sodium acid carbonate in sediment, then under the rotating speed of 15000rpm after high speed centrifugation 10min, collecting precipitation thing, by the sediment freeze drier freeze drying 24h at the temperature of-50 DEG C collected, obtains P (HB-HO)/CS composite nano adsorbent.
P (the HB-HO)/CS composite nano adsorbent prepared with embodiment 5 is to naphthalene, Pb
2+compound sewage carries out adsorption treatment.Take naphthalene and Pb that 0.5gP (HB-HO)/CS composite nano adsorbent is placed in 200mL, initial concentration is 50mg/L
2+mixed solution in, water bath with thermostatic control vibration 24h under the conditions of 30 DEG C and 150rpm, centrifugation also measures naphthalene (high performance liquid chromatography) and Pb in solution respectively
2+the concentration of (atomic absorption spectrophotometry).P (HB-HO)/CS composite nano adsorbent is to naphthalene and Pb
2+adsorption rate be respectively 96.11%, 97.89%.
In contrast, as adsorbent, adopt method same as described above to naphthalene, Pb CS and P (HB-HO) intermingling material (ratio of weight and number of CS and P (HB-HO) is 2:5)
2+compound sewage carries out adsorption treatment.Intermingling material adsorbent is to naphthalene and Pb
2+adsorption rate be respectively 22.74%, 29.38%.
Result shows: prepared P (HB-HO)/CS composite nano adsorbent is to naphthalene, Pb
2+compound sewage adsorption effect is remarkable.
Embodiment 6:
A kind of composite nano adsorbent of the present embodiment, wherein: the matrix of following row parts by weight is raw material:
P (HB-HO) 30 parts, CS6 part, 28 parts, sodium chloride, PVA15 part;
Described P (HB-HO) is hydroxybutyric acid and Hydroxyoctanoic acid EVA; Described CS is shitosan; Described PVA is polyvinyl alcohol.
Prepare a method for described composite nano adsorbent, wherein: comprise the following steps:
(1) P (HB-HO) of above-mentioned parts by weight is dissolved in chloroform, and described P (HB-HO) concentration in chloroform is 10%;
(2) again the CS of above-mentioned parts by weight is put into concentration be 2% acetum dissolve, then add above-mentioned parts by weight sodium chloride mixing after, high-speed homogenization 8min under the rotating speed of 12000rpm, formed colostric fluid;
(3) first get the PVA of 1 part, be dissolved into the PVA aqueous solution that concentration is 0.5%, then after mixing with the colostric fluid that step (2) obtains, high-speed homogenization 8min under the rotating speed of 12000rpm, forms double emulsion;
(4) double emulsion that step (3) is obtained is fully stirred 5h, chloroform is volatilized completely, makes double emulsion high speed centrifugation 10min under the rotating speed of 15000rpm, abandon supernatant, collecting precipitation thing;
(5) remaining PVA is dissolved into the PVA aqueous solution that concentration is 1%, the sediment that step (4) is collected is scattered in this PVA aqueous solution, shaken overnight, wash away the remaining sodium chloride in sediment, then under the rotating speed of 15000rpm after high speed centrifugation 10min, collecting precipitation thing, by the sediment freeze drier freeze drying 24h at the temperature of-50 DEG C collected, obtains P (HB-HO)/CS composite nano adsorbent.
P (the HB-HO)/CS composite nano adsorbent prepared with embodiment 6 is to toluene, Cr
6+compound sewage carries out adsorption treatment.Take toluene and Cr that 0.5gP (HB-HO)/CS composite nano adsorbent is placed in 200mL, initial concentration is 50mg/L
6+mixed solution in, water bath with thermostatic control vibration 24h under the conditions of 30 DEG C and 150rpm, centrifugation also measures toluene (high performance liquid chromatography) and Cr in solution respectively
6+the concentration of (atomic absorption spectrophotometry).P (HB-HO)/CS composite nano adsorbent is to toluene and Cr
6+adsorption rate be respectively 97.38%, 98.76%.
In contrast, as adsorbent, adopt method same as described above to toluene, Cr 0.5gCS and P (HB-HO) intermingling material (ratio of weight and number of CS and P (HB-HO) is 1:5)
6+compound sewage carries out adsorption treatment.Intermingling material adsorbent is to toluene and Cr
6+adsorption rate be respectively 21.35%, 30.58%.
Result shows: prepared P (HB-HO)/CS composite nano adsorbent is to toluene, Cr
6+compound sewage adsorption effect is remarkable.
Claims (5)
1. a composite nano adsorbent, is characterized in that: the matrix of following row parts by weight is raw material:
P (HB-HO) 3 ~ 30 parts, CS1 ~ 15 part, pore-foaming agent 5 ~ 30 parts, PVA11 ~ 25 part;
Described P (HB-HO) is hydroxybutyric acid and Hydroxyoctanoic acid EVA; Described CS is shitosan; Described PVA is polyvinyl alcohol.
2. prepare a method for composite nano adsorbent according to claim 1, it is characterized in that: comprise the following steps:
(1) P (HB-HO) of above-mentioned parts by weight is dissolved in organic phase, and described P (HB-HO) concentration in organic phase is 1 ~ 10%;
(2) again the CS of above-mentioned parts by weight is put into concentration be 2% acetum dissolve, then add above-mentioned parts by weight pore-foaming agent mixing after, high-speed homogenization 5 ~ 10min under the rotating speed of 10000 ~ 15000rpm, formed colostric fluid;
(3) first get the PVA of 1 ~ 15 part, be dissolved into the PVA aqueous solution that concentration is 0.1 ~ 1.5%, then after mixing with the colostric fluid that step (2) obtains, high-speed homogenization 5 ~ 10min under the rotating speed of 10000 ~ 15000rpm, forms double emulsion;
(4) double emulsion that step (3) is obtained is fully stirred 5 ~ 8h, organic phase is volatilized completely, makes double emulsion high speed centrifugation 10min under the rotating speed of 15000rpm, abandon supernatant, collecting precipitation thing;
(5) remaining PVA is dissolved into the PVA aqueous solution that concentration is 1%, the sediment that step (4) is collected is scattered in this PVA aqueous solution, shaken overnight, wash away the remaining pore-foaming agent in sediment, then under the rotating speed of 15000rpm after high speed centrifugation 10min, collecting precipitation thing, by the sediment freeze drier freeze drying 24h at the temperature of-50 DEG C collected, obtains P (HB-HO)/CS composite nano adsorbent.
3. the preparation method of composite nano adsorbent according to claim 2, is characterized in that: described organic phase is chloroform or carrene.
4. the preparation method of composite nano adsorbent according to claim 2, is characterized in that: described pore-foaming agent is any one in sodium chloride, sodium acid carbonate or hydrogen peroxide.
5. composite nano adsorbent according to claim 1, is characterized in that: described composite nano adsorbent is applied to simultaneously in absorption effluent in heavy metal and hydrophobic organic compound.
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