CN103285803B - Method of preparing porous CdO absorbent through thermal decomposition and application of porous CdO absorbent in wastewater treatment - Google Patents
Method of preparing porous CdO absorbent through thermal decomposition and application of porous CdO absorbent in wastewater treatment Download PDFInfo
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- CN103285803B CN103285803B CN201310276510.7A CN201310276510A CN103285803B CN 103285803 B CN103285803 B CN 103285803B CN 201310276510 A CN201310276510 A CN 201310276510A CN 103285803 B CN103285803 B CN 103285803B
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Abstract
The invention provides a method of preparing porous CdO absorbent through high temperature thermal decomposition, and belongs to the technical field of inorganic materials. The method comprises the steps of: grinding Cd(NO3)2.4H2O to powder, roasting the powder at 400-700 DEG C for 3-8 hours, cooling the powder to room temperature, and grinding the powder to obtain the porous CdO absorbent. As being verified in a large number of experiments, the porous CdO absorbent prepared by the method provided by the invention has good adsorption function on such anionic dyes in wastewater as Congo red, methyl orange and orange G, and the like, and meanwhile having strong adsorption ability on copper ions in the wastewater, so that the porous CdO absorbent can be used for treating anionic dye wastewater and industrial wastewater containing heavy metal ions. The porous CdO absorbent prepared by the method provided by the invention has the advantages of good chemical stability, easiness for separation, low cost, and the like, thereby being a potential sewage adsorption material.
Description
Technical field
The invention belongs to technical field of inorganic material, relate to a kind of preparation method of porous C dO adsorbent, particularly relate to a kind of method adopting high temperature thermal decomposition to prepare porous C dO adsorbent, be mainly used in the dyestuff in absorption effluent and heavy metal ion.
Background technology
Along with the development of DYE PRODUCTION and dyeing, the discharge capacity of dying industrial wastewater sharply increases.Current dye quantity reaches tens thousand of kinds, many dye product complex process, yield poorly, side reaction is many, such that waste water from dyestuff quantity is large, complicated component, very large to the harm of human body and environment.Waste water from dyestuff has that colourity is large, organic pollution content is high, complicated components, salt content are high, water quality and quantity change greatly and the feature such as bio-refractory, make its intractability larger, and along with dye species gets more and more, and the requirement of dyestuff is improved constantly, the production of dyestuff is progressively towards anti-light solution, oxidation resistant future development, the composition of waste water from dyestuff is become increasingly complex, further increases wastewater treatment difficulty.
At present, the method being usually used in industrial dye waste water process both at home and abroad has: the methods such as biological treatment, chemical flocculation, chemical oxidization method, absorption method and electrochemical process.Absorption method, due to features such as technique are simple, cost is low, efficient, is occupied and is had consequence in the process of waste water from dyestuff and heavy metal containing sewage.
CdO is a kind of II ~ VI group of important semiconductor functional material.At present, the CdO of different structure and pattern can be prepared by diverse ways nanocrystalline.Such as, prepare CdO nano wire and nanobelt with physical evaporation method, prepare CdO nano wire by alumina formwork method, electrochemical deposition method and reverse microemulsion process and prepare CdO nanometer rods and nanocrystal etc. with solvent-thermal method.Although above method has successfully prepared the CdO nanocrystal of different structure and pattern, the equal more complicated of these synthetic methods, and cost is higher.
Summary of the invention
The object of the invention is for problems of the prior art, a kind of method adopting high temperature thermal decomposition to prepare porous C dO adsorbent is provided.
The present invention adopts high temperature thermal decomposition to prepare the method for porous C dO adsorbent, is by Cd (NO
3)
24H
2o is ground into powder, and then roasting 3 ~ 8 hours at 400 ~ 700 DEG C, is cooled to room temperature, and grinding, obtains porous C dO adsorbent.
Below by ESEM and X-ray diffraction, the stuctures and properties to porous C dO adsorbent of the present invention is described.
1, ESEM
Fig. 1 is the scanning electron microscope (SEM) photograph of porous C dO adsorbent.From Fig. 1, we can find out relatively loosen in the surface of CdO, and are distributed a lot of duct, illustrate that the internal structure of CdO is porous type.
2、XRD
Fig. 2 is the XRD figure of porous C dO adsorbent.In figure, the number of degrees of the angle of diffraction 2 θ are respectively 32.90 °, 38.20 °, 55.20 °, 65.80 °, and (111) of 69.20 ° of corresponding cubic structures crystal formation (JCPDS-05-0640) of decibel, (200), (220), (311) and (222) crystal face.Illustrate that porous C dO adsorbent crystallinity very well and have good chemical stability.
3, absorption property test
3.1 pairs of Congo red adsorption tests
Get 100mg porous C dO adsorbent, dropping into initial concentration is in the Congo red solution of 100ml of 100mg/L, and stirring and adsorbing is after 1 hour, after centrifugation adsorbent, measuring Congo red concentration with ultraviolet specrophotometer (TU-1901 type) is 0.135mg/L, and adsorption rate is 99.86%.
The adsorption test of 3.2 pairs of malachite greens
Get 100 mg porous C dO adsorbents, dropping into initial concentration is in the 100ml malachite green solution of 100 mg/L, and stirring and adsorbing is after 3 hours, after centrifugation adsorbent, measuring malachite green concentration with ultraviolet specrophotometer (TU-1901 type) is 71.92 mg/L, and adsorption rate is 28.08%.
The adsorption test of 3.3 pairs of orange Gs
Get 100 mg porous C dO adsorbents, dropping into initial concentration is in the 50 ml orange G solution of 10mg/L, and stirring and adsorbing is after 3 hours, after centrifugation adsorbent, measuring orange G concentration with ultraviolet specrophotometer (TU-1901 type) is 0.206 mg/L, and adsorption rate is 97.94%.
The adsorption test of 3.4 pairs of methyl oranges
Get 100 mg porous C dO adsorbents, dropping into initial concentration is in the 50 ml methyl orange solutions of 10 mg/L, and stirring and adsorbing is after 3 hours, after centrifugation adsorbent, measuring methyl orange concentration with ultraviolet specrophotometer (TU-1901 type) is 0.378 mg/L, and adsorption rate is 96.22%.
The adsorption test of 3.5 pairs of methylene blues
Get 100 mg porous C dO adsorbents, dropping into initial concentration is in the 50 ml methylene blue solutions of 10 mg/L, and stirring and adsorbing is after 3 hours, after centrifugation adsorbent, measuring methylene blue concentration with ultraviolet specrophotometer (TU-1901 type) is 6.49 mg/L, and adsorption rate is 3.51%.
The adsorption test of 3.6 pairs of rhodamine Bs
Get 100 mg porous C dO adsorbents, dropping into initial concentration is in the 50 ml rhodamine B solution of 10 mg/L, and stirring and adsorbing is after 3 hours, after centrifugation adsorbent, measuring rhodamine B concentration with ultraviolet specrophotometer (TU-1901 type) is 7.43 mg/L, and adsorption rate is 2.57%.
3.7 couples of CuSO
45H
2the adsorption test of O solution
Get 100 mg porous C dO adsorbents, drop into 100 mlCuSO that initial concentration is 100 mmg/L
45H
2in O solution, stirring and adsorbing is after 6 hours, and after centrifugation adsorbent, with copper ion and content in Fo Erhadefa titration clear liquid, result shows, adsorbent is 89.76% to the adsorption rate of copper ion.
3.8 roasting time are tested the impact of absorption property
Take 1000 g Cd (NO
3)
24H
2o, grind into powder, is then placed in alumina crucible, and is positioned in Muffle furnace by crucible, difference roasting 3 hours, 4 hours, 5 hours, 6 hours, 7 hours and 8 hours at 400 DEG C; Take out when being cooled to room temperature, grinding, obtains porous C dO adsorbent.The adsorption rate of this porous C dO adsorbent to anionic dye methyl orange sees the following form.
Above-mentioned experiment shows, when increasing gradually upon firing, the adsorption effect of porous C dO adsorbent to anionic dye methyl orange increases.
In sum, the porous C dO adsorbent that the present invention adopts high temperature thermal decomposition to prepare, to Congo red, the anionic dye such as methyl orange, orange G in waste water, there is good suction-operated, to the copper ion in waste water, there is stronger adsorption capacity simultaneously, and poor to the ability of the dyes of positive ion such as the malachite green in waste water, methylene blue, rhodamine B.Therefore, can be used for processing anionic dye waste water and the trade effluent containing heavy metal ion.The porous C dO adsorbent chemical stability prepared due to the present invention is good, is easy to be separated, and low cost and other advantages is the very potential sewage sorbing material of one.
Accompanying drawing explanation
Fig. 1 is the scanning electron microscope (SEM) photograph of porous C dO adsorbent.
Fig. 2 is the XRD figure of porous C dO adsorbent.
Detailed description of the invention
Embodiment 1
Take 1000 g Cd (NO
3)
24H
2o, grind into powder, is then placed in alumina crucible, and is positioned in Muffle furnace by crucible, roasting 3 hours at 400 DEG C; Take out when being cooled to room temperature, grinding, obtains porous C dO adsorbent.The adsorption rate of this porous C dO adsorbent to anionic dye sees the following form.
Embodiment 2
Take 1000 g Cd (NO
3)
24H
2o, grind into powder, is then placed in alumina crucible, and is positioned in Muffle furnace by crucible, roasting 3 hours at 500 DEG C; Take out when being cooled to room temperature, grinding, obtains porous C dO adsorbent.The adsorption rate of this porous C dO adsorbent to anionic dye sees the following form.
Embodiment 3
Take 1000 g Cd (NO
3)
24H
2o, grind into powder, is then placed in alumina crucible, and is positioned in Muffle furnace by crucible, roasting 3 hours at 600 DEG C; Take out when being cooled to room temperature, grinding, obtains porous C dO adsorbent.The adsorption rate of this porous C dO adsorbent to anionic dye sees the following form.
Embodiment 4
Take 1000 g Cd (NO
3)
24H
2o, grind into powder, is then placed in alumina crucible, and is positioned in Muffle furnace by crucible, roasting 3 hours at 700 DEG C; Take out when being cooled to room temperature, grinding, obtains porous C dO adsorbent.The adsorption rate of this porous C dO adsorbent to anionic dye sees the following form.
Above-described embodiment shows, when sintering temperature raises gradually, porous C dO adsorbent is less on the absorption property impact that anionic dye is Congo red, almost remains unchanged.But increase to the adsorption effect of methyl orange, orange G and heavy metal ion copper ion, this just demonstrates the rising along with sintering temperature, the absorption property of porous C dO adsorbent improves.
Claims (1)
1. adopt the porous C dO adsorbent prepared of thermolysis process for the treatment of the waste water containing heavy metal ion; The method that described employing thermolysis process prepares porous C dO adsorbent is: by Cd (NO
3)
24H
2o is ground into powder, and then roasting 3 ~ 8 hours at 400 ~ 700 DEG C, is cooled to room temperature, and grinding, obtains porous C dO adsorbent.
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| CN101891240A (en) * | 2010-07-14 | 2010-11-24 | 南京大学 | Preparation method of CdO porous nanometer material |
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| CN101891240A (en) * | 2010-07-14 | 2010-11-24 | 南京大学 | Preparation method of CdO porous nanometer material |
Non-Patent Citations (2)
| Title |
|---|
| Synthesis, Characterization and Adsorption Capability of CdO Microstructure for Congo Red from Aqueous Solution;A. Tadjarodi etal.;《Journal of Nanostructures》;20120601;第2卷;摘要 * |
| The effect of Er3+ doping on the structure and thermoelectric properties of CdO ceramics;Shufang Wang etal.;《Journal of the European Ceramic Society》;20130405;第33卷;第1764页左栏第2段以及右栏第3段 * |
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