JPH07275850A - Activated carbon for removing lead and manufacture of the same - Google Patents
Activated carbon for removing lead and manufacture of the sameInfo
- Publication number
- JPH07275850A JPH07275850A JP6098019A JP9801994A JPH07275850A JP H07275850 A JPH07275850 A JP H07275850A JP 6098019 A JP6098019 A JP 6098019A JP 9801994 A JP9801994 A JP 9801994A JP H07275850 A JPH07275850 A JP H07275850A
- Authority
- JP
- Japan
- Prior art keywords
- activated carbon
- hydroxyapatite
- pores
- water
- lead
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Carbon And Carbon Compounds (AREA)
- Removal Of Specific Substances (AREA)
- Water Treatment By Sorption (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は水中の鉛除去用活性炭及
びその製法に関するもので、更に詳しく述べると水中の
鉛イオン除去性を付与した活性炭で、浄水器或いは排水
処理装置に取り付けて使用される浄化材及びその製法で
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to activated carbon for removing lead in water and a method for producing the same. More specifically, it is activated carbon having the ability to remove lead ions in water and is used by being attached to a water purifier or a waste water treatment device. Purifying material and its manufacturing method.
【０００２】[0002]
【従来の技術】従来水中に含まれている微量の鉛イオン
の除去材料としては、粒状の除去材が一般に使われてい
る。しかし、鉛イオンの吸着速度またはイオン交換速度
が遅いので、浄水器等の高速で通水して使用する機器に
しても充分に水中の鉛を除去することが出来なかった。2. Description of the Related Art Conventionally, a granular removing material is generally used as a removing material for a trace amount of lead ions contained in water. However, since the adsorption rate or ion exchange rate of lead ions is slow, it is not possible to sufficiently remove lead in water even with a device such as a water purifier that allows water to pass through at high speed.
【０００３】吸着速度或いはイオン交換速度を高くする
ためには粒子径を小さくする方法が効果的であるが、こ
の場合高い吸着速度を確保するためには鉛除去材料の粒
子の径を数ミクロン程度の微粒子にする必要がある。し
かし、この様な微粒子では粒状活性炭と混合して浄水器
カートリッジに充填しても、微粒子が流出して失われる
か或いは、流路を塞いで通水ができなくなるおそれがあ
る。また、微細粒子を繊維状活性炭の成型物の中に含有
せしめて成型体を作るのが困難である。In order to increase the adsorption rate or ion exchange rate, a method of reducing the particle size is effective. In this case, in order to secure a high adsorption rate, the particle size of the lead removing material is about several microns. Need to be fine particles. However, even if such fine particles are mixed with granular activated carbon and filled in a water purifier cartridge, there is a possibility that the fine particles may flow out and be lost, or the passage may be blocked and water cannot be passed. In addition, it is difficult to make a molded product by including fine particles in a molded product of fibrous activated carbon.
【０００４】[0004]
【発明が解決しようとする課題】活性炭或いは繊維状活
性炭の細孔内に鉛除去性化合物を含有させることによ
り、水中の有機物や遊離塩素を除去すると同時に鉛イオ
ンを除去する機能を有し、浄水器等のように比較的通水
速度が速い場合にも、高い鉛の吸着能力を発揮出来る活
性炭または繊維状活性炭を提供しようとするものであ
る。By incorporating a lead-removing compound into the pores of activated carbon or fibrous activated carbon, it has the function of removing organic matter and free chlorine in water and simultaneously removing lead ions. It is intended to provide activated carbon or fibrous activated carbon that can exhibit a high lead adsorption capacity even when the water flow rate is relatively high, such as in a vessel.
【０００５】[0005]
【課題を解決するための手段】本発明者等は水中の鉛イ
オンを除去するため、高い鉛イオンの除去機能を有する
浄水器用鉛除去材について検討した。その結果、活性炭
の細孔にヒドロキシアパタイトの微細結晶を成長せしめ
た活性炭は、その細孔表面の有する高い吸着性とも相ま
って高い鉛イオンの選択吸着性を示すことを見出した。
更にヒドロキシアパタイトを合成する際活性炭の細孔表
面の高い吸着性を利用して、予め細孔内にカルシウム塩
を充分に吸着せしめた後、pHを一定の範囲内に保持した
リン酸またはリン酸のアンモニウム塩溶液等に含浸させ
ることにより、細孔内部に微小なヒドロキシアパタイト
の結晶が成長して、高い鉛イオン吸着能を有する活性炭
が得られることを見出し、これに基づいて本発明に到達
した。In order to remove lead ions in water, the present inventors have studied a lead removing material for a water purifier having a high lead ion removing function. As a result, it was found that activated carbon obtained by growing fine hydroxyapatite crystals in the pores of activated carbon exhibits high selective adsorption of lead ions in combination with high adsorption on the surface of the pores.
Furthermore, when synthesizing hydroxyapatite, by utilizing the high adsorptivity of the pore surface of activated carbon, the calcium salt was sufficiently adsorbed in the pores in advance, and then phosphoric acid or phosphoric acid whose pH was maintained within a certain range. It was found that by impregnating it with ammonium salt solution or the like, fine hydroxyapatite crystals grow inside the pores, and activated carbon having a high lead ion adsorption capacity can be obtained, and based on this, the present invention was reached. .
【０００６】すなわち、活性炭の細孔内にヒドロキシア
パタイトを生成せしめてなる水中の鉛除去用活性炭及
び、カルシウム塩水溶液中に活性炭を浸漬してカルシウ
ム塩を吸着せしめた後要すれば緩衝液を加えて、pHを8.
5 〜9.5 の範囲内に保持しながら、リン酸、リン酸のア
ンモニウム塩、ナトリウム塩、カリウム塩及びそれらの
酸性塩からなる群より選ばれた、一種または二種以上の
化合物の溶液を加えて活性炭の細孔内にヒドロキシアパ
タイトを生成せしめることを特徴とする水中の鉛除去用
活性炭の製法である。[0006] That is, activated carbon for removing lead in water in which hydroxyapatite is generated in the pores of activated carbon and activated carbon are immersed in an aqueous solution of calcium salt to adsorb the calcium salt, and then a buffer solution is added if necessary. PH to 8.
While maintaining within the range of 5 to 9.5, add a solution of one or more compounds selected from the group consisting of phosphoric acid, ammonium salts of phosphoric acid, sodium salts, potassium salts and acid salts thereof. This is a method for producing activated carbon for removing lead in water, which is characterized in that hydroxyapatite is generated in the pores of activated carbon.
【０００７】以下、本発明について詳しく説明する。The present invention will be described in detail below.
【０００８】本発明の水中の鉛除去用活性炭はその基材
として活性炭を使用する必要がある。ここで使用する基
材の活性炭は、通常1gあたり数100 m2或いはそれ以上の
大きな表面積を有し、高い吸着性を示す炭素材料であれ
ば広範囲に使用できる。活性炭の原料は通常ヤシ殻また
は木材等の炭化物或いは石炭が使用されるが何れでもよ
い。また賦活法も水蒸気或いは二酸化炭素により高温で
または塩化亜鉛、リン酸、濃硫酸処理等いづれの方法に
より得られたものでもよい。The activated carbon for removing lead in water according to the present invention requires the use of activated carbon as its base material. The activated carbon used as the base material here has a large surface area of several hundred m 2 or more per 1 g, and can be widely used as long as it is a carbon material exhibiting high adsorptivity. As the raw material of the activated carbon, a charcoal such as coconut shell or wood or coal is usually used, but any may be used. Further, the activation method may be obtained by steam or carbon dioxide at a high temperature or by any method such as treatment with zinc chloride, phosphoric acid or concentrated sulfuric acid.
【０００９】また形状は破砕炭、造粒炭或いは顆粒炭の
何れでも効果は認められるが、圧損失及び入替等取扱い
上造粒炭または活性炭を添着したシート状吸着層が便利
である。造粒炭は常法に従って炭素材料100 部に30〜60
部の石油ピッチ或いはコールタール等をバインダーとし
て加え混和成型後賦活して調製される。Although the shape of crushed charcoal, granulated charcoal, or granulated charcoal is effective, a sheet-shaped adsorption layer impregnated with granulated charcoal or activated charcoal is convenient in terms of handling such as pressure loss and replacement. Granulated charcoal is 30 to 60 per 100 parts of carbon material
Part of petroleum pitch, coal tar or the like is added as a binder, and the mixture is kneaded and molded and then activated.
【００１０】更に、繊維状活性炭は通常の粒状活性炭に
較べて比表面積を著しく高めることが可能であり、この
ため細孔表面の吸着性も高く、水の浄化機能が優れてい
る他、水中のトリハロメタンを吸着除去する機能も高い
ため、本発明の鉛除去材の基材としてはより好ましい。
その他合成樹脂炭化物、骨炭等の吸着性炭素材料も基材
として使用可能である。Further, the fibrous activated carbon can significantly increase the specific surface area as compared with the ordinary granular activated carbon. Therefore, the adsorptivity of the surface of the pores is high, the water purification function is excellent, and Since it has a high function of adsorbing and removing trihalomethane, it is more preferable as the base material of the lead removing material of the present invention.
Other adsorptive carbon materials such as synthetic resin carbide and bone charcoal can also be used as the base material.
【００１１】本発明の鉛除去用活性炭は基材の活性炭の
細孔内にヒドロキシアパタイトを生成せしめたものであ
る必要がある。ヒドロキシアパタイトの結晶が活性炭の
細孔内に広い面積に分布しているため水と充分に接触
し、更に活性炭の大きな比表面積に基づくファンデルヴ
ァールス力による細孔表面の高い吸着性と相まって、ヒ
ドロキシアパタイトの鉛イオンに対する選択的な交換機
能が著しく高められるため、水中の鉛イオンの除去速度
が著しく高くなる。このため高速で水を通過させて使用
する、浄水器或いは排水処理装置用の鉛除去材としても
充分に使用可能である。The lead-removing activated carbon of the present invention needs to have hydroxyapatite generated in the pores of the activated carbon of the base material. Since the hydroxyapatite crystals are distributed over a wide area in the pores of activated carbon, they are in good contact with water, and in combination with the high adsorptivity of the pore surface due to the van der Waals force due to the large specific surface area of activated carbon, Since the selective exchange function of apatite for lead ions is remarkably enhanced, the removal rate of lead ions in water is remarkably increased. Therefore, it can be sufficiently used as a lead removing material for a water purifier or a waste water treatment device that allows water to pass through at high speed.
【００１２】更に、基材の活性炭は水中の悪臭物質、残
留塩素及びトリハロメタン等不純物の吸着除去性も高い
ので、これらの浄水機能も併せて発揮される。Furthermore, since the activated carbon as the base material has a high adsorptive removal property of malodorous substances, residual chlorine and impurities such as trihalomethane in water, these water purifying functions are also exhibited.
【００１３】活性炭の細孔内部にヒドロキシアパタイト
Ca10(PO4)6(OH)2 を生成せしめる方法には乾式法と湿式
法があるが、活性炭は比較的低温で着火し易いため高温
処理を必要とする乾式法は不適当であり、100 ℃程度で
処理をする湿式法が好ましい。本発明の活性炭の細孔内
にヒドロキシアパタイトを生成させる方法では、先ず基
材の活性炭をカルシウム塩水溶液中に浸漬してカルシウ
ム塩を吸着せしめる必要がある。活性炭表面は極めて多
数の細孔からなり大きな比表面積を有するため、高い無
極吸着性を有する物質である。従って、カルシウム塩の
水溶液中に浸漬することにより多量のカルシウム塩を細
孔表面に吸着・担持させることが出来る。尚、この際次
のヒドロキシアパタイト生成反応工程を考慮して、カル
シウム塩水溶液のpHを8.5 〜9.5 の範囲内に保持して吸
着させることが好ましい。Hydroxyapatite inside the pores of activated carbon
There are a dry method and a wet method for producing Ca 10 (PO 4 ) 6 (OH) 2 , but activated carbon is apt to ignite at a relatively low temperature, so a dry method requiring high temperature treatment is unsuitable, A wet method of treating at about 100 ° C. is preferable. In the method of producing hydroxyapatite in the pores of the activated carbon of the present invention, it is first necessary to immerse the activated carbon of the base material in an aqueous calcium salt solution to adsorb the calcium salt. The surface of activated carbon is a substance having a high non-polar adsorptive property because it has a large specific surface area made up of an extremely large number of pores. Therefore, a large amount of calcium salt can be adsorbed and supported on the surface of the pores by immersing it in an aqueous solution of calcium salt. At this time, it is preferable to keep the pH of the aqueous calcium salt solution within the range of 8.5 to 9.5 for adsorption in consideration of the subsequent hydroxyapatite formation reaction step.
【００１４】ここで使用されるカルシウム塩は特に限定
せず、広範囲なカジウム塩が使用可能である。例えば、
CaCl2 、Ca(No3)2、(CH3COO)2Ca 、Ca(OH)2 、CaCO3 、
CaSO4 ・H2O 等が使用可能である。The calcium salt used here is not particularly limited, and a wide range of cadium salts can be used. For example,
CaCl 2 , Ca (No 3 ) 2 , (CH 3 COO) 2 Ca, Ca (OH) 2 , CaCO 3 ,
CaSO 4 · H 2 O etc. can be used.
【００１５】次にカルシウム塩を吸着した活性炭に、リ
ン酸、リン酸のアンモニウム塩、ナトリウム塩、カリウ
ム塩及びそれらの酸性塩からなる群より選ばれた一種ま
たは二種以上の化合物の溶液を、pH8.5 〜9.5 の範囲内
に保持しながら加える必要がある。この際リン酸、リン
酸のアンモニウム塩等の化合物と活性炭の細孔内に吸着
されていたカルシウム塩との反応は、細孔表面の吸着性
によって一層促進される。更に、この反応液のpHが8.5
〜9.5 の範囲内に保持されているため、ヒドロキシアパ
タイトCa10(PO4)6(OH)2 が選択的に生成され、活性炭の
細孔内にヒドロキシアパタイトの微結晶が生成される。Next, a solution of one or more compounds selected from the group consisting of phosphoric acid, ammonium salts of phosphoric acid, sodium salts, potassium salts and their acidic salts is added to activated carbon having adsorbed calcium salts, It must be added while maintaining the pH within the range of 8.5 to 9.5. At this time, the reaction between the compound such as phosphoric acid or ammonium salt of phosphoric acid and the calcium salt adsorbed in the pores of the activated carbon is further promoted by the adsorptivity of the pore surface. Furthermore, the pH of this reaction solution is 8.5.
Since it is kept in the range of ˜9.5, hydroxyapatite Ca 10 (PO 4 ) 6 (OH) 2 is selectively produced, and hydroxyapatite microcrystals are produced in the pores of the activated carbon.
【００１６】カルシウム塩を吸着した活性炭に、リン
酸、リン酸のアンモニウム塩等をpHを8.5 〜9.5 の範囲
内に保持して加える際、pHを一定の範囲内に保持するた
め要すれば緩衝液を加えることが好ましい。緩衝液は溶
液のpHを8.5 〜9.5 に保持出来るものであれば特に限定
しないが、例えば、KH2PO4-Na2HPO4系或いはH3BO3 ＋KC
l-NaOH 系緩衝液が好ましい。When phosphoric acid, ammonium salt of phosphoric acid, etc. are added to activated carbon having adsorbed calcium salt while keeping the pH within the range of 8.5 to 9.5, a buffer is required to keep the pH within the certain range. It is preferable to add a liquid. The buffer solution is not particularly limited as long as it can maintain the pH of the solution at 8.5 to 9.5. For example, KH 2 PO 4 -Na 2 HPO 4 system or H 3 BO 3 + KC
I-NaOH buffer is preferred.
【００１７】これらの反応液（好ましくは、溶解度の大
きいリン酸のアンモニウム塩、ナトリウム塩、カリウム
塩等）の一種または二種以上の化合物の混合液に緩衝液
を加えてpHを調整した液に、カルシウム塩を吸着した活
性炭を浸漬する。次いで、反応液を適当な反応温度（80
℃〜100 ℃程度）に加熱しながら残りの反応液を滴下す
ることによって、細孔内のヒドロキシアパタイトの生成
が一層促進される。A buffer solution is added to a mixed solution of one or more of these reaction solutions (preferably ammonium salts of phosphoric acid having high solubility, sodium salts, potassium salts, etc.) to adjust the pH. Soak activated carbon with adsorbed calcium salt. Then, the reaction solution is heated to an appropriate reaction temperature (80
The production of hydroxyapatite in the pores is further promoted by adding the remaining reaction solution dropwise while heating to about 100 ° C to 100 ° C.
【００１８】本発明方法は活性炭の吸着性を利用してカ
ルシウム塩を活性炭の細孔内に吸着させ、更に活性炭の
吸着性を利用してリン酸または、リン酸のアンモニウム
塩等の分子を細孔内に吸着させることによりヒドロキシ
アパタイト生成反応を促進させて、細孔内の広範囲の面
積をその微結晶で被覆すると共に、微結晶粒子間の間隙
を通して細孔内における活性炭の吸着力を保持した状態
とする点に最も特徴を有するものである。The method of the present invention utilizes the adsorptivity of activated carbon to adsorb a calcium salt into the pores of activated carbon, and further utilizes the adsorptivity of activated carbon to reduce molecules such as phosphoric acid or ammonium salt of phosphoric acid. By adsorbing in the pores, the hydroxyapatite formation reaction was promoted, covering a wide area in the pores with the microcrystals and maintaining the adsorption power of activated carbon in the pores through the gaps between the microcrystal particles. It is the most characteristic in that it is in a state.
【００１９】このため細孔内における水とヒドロキシア
パタイトとの接触面積が著しく大きくなると共に、水中
の鉛イオンに対する活性炭の吸着力の相乗効果と相まっ
て浄水器或いは排水処理装置に水を高速で通過させた場
合にも、鉛イオンとカルシウムイオンの交換速度を高い
状態に保持することを可能とするものである。For this reason, the contact area between water and hydroxyapatite in the pores is significantly increased, and in combination with the synergistic effect of the adsorptive power of activated carbon for lead ions in water, the water is passed through the water purifier or the waste water treatment equipment at high speed. In this case, the exchange rate of lead ions and calcium ions can be kept high.
【００２０】ヒドロキシアパタイトに含まれるカルシウ
ムイオンと、水溶液中の金属イオンのイオン交換反応に
は顕著な選択性が認められ、鉛イオンに対しては高い選
択性を示す。また、このイオン交換反応の速度は基材で
ある活性炭の高い吸着性によって更に促進される。水中
の鉛イオンの除去は、前記の様にヒドロキシアパタイト
のカルシウムイオンとの選択的イオン交換によってなさ
れるため、通常の水道水の様にカルシウム鉄等の多種類
の金属イオンを含む場合にも、鉛イオンの除去剤として
充分な効果が得られる。また、ヒドロキシアパタイトは
骨格の構成成分にも含まれている化合物であるから、処
理水に微量のヒドロキシアパタイトが含まれていても衛
生上無害である。The ion exchange reaction between the calcium ion contained in hydroxyapatite and the metal ion in the aqueous solution has a remarkable selectivity, and shows a high selectivity for lead ion. Further, the rate of this ion exchange reaction is further accelerated by the high adsorptivity of the activated carbon as the base material. Removal of lead ions in water is carried out by selective ion exchange with calcium ions of hydroxyapatite as described above, and therefore, when many kinds of metal ions such as calcium iron are contained like ordinary tap water, A sufficient effect can be obtained as a lead ion remover. In addition, since hydroxyapatite is a compound that is also contained in the constituent components of the skeleton, even if the treated water contains a small amount of hydroxyapatite, it is harmless in terms of hygiene.
【００２１】このイオン交換反応式は通常次の様に示さ
れるが、生成物の詳細な構造は明確でない。This ion exchange reaction formula is usually shown as follows, but the detailed structure of the product is not clear.
【００２２】[0022]
【化１】 [Chemical 1]
【００２３】本発明方法による活性炭の細孔内における
ヒドロキシアパタイトの合成は、他の無機吸着剤と異な
り湿式法によって低温で合成することが可能であり、活
性炭が反応工程で燃焼するおそれがないため安全性にも
優れている。The synthesis of hydroxyapatite in the pores of activated carbon according to the method of the present invention can be performed at a low temperature by a wet method unlike other inorganic adsorbents, and activated carbon is not likely to burn in the reaction step. Excellent in safety.
【００２４】[0024]
【実施例】以下、実施例を挙げて本発明を更に具体的に
説明する。EXAMPLES The present invention will be described in more detail below with reference to examples.
【００２５】（実施例１）0.16 W％ Ca(NO3)2 水溶液10
0ml にアンモニアガスを通気してPHを8.5-9.5 になるよ
うに調製した後、粒度16-35 meshの活性炭（窒素吸着法
により、半径20Å以上が82％存在）30g を加え一昼夜放
置した。放置後の活性炭を濾過し、余分な溶液を取り除
いた。次に、200ml ビーカーにこの活性炭を入れ、100
℃程度に加熱しながら、アンモニアガスでPHを8.5-9.5
にした0.067 W ％(NH4)2HPO4水溶液100 mlと 5.94 W ％
CH3COONH4水溶液100 mlを 1 ml/min の流量で滴下し、
更に、PHを8.5-9.5 としながら、ヒドロキシアパタイト
を合成した。その結果、活性炭重量に対して6.0 ％のヒ
ドロキシアパタイトを含有させることが出来た。Example 1 0.16 W% Ca (NO 3 ) 2 Aqueous Solution 10
Ammonia gas was bubbled through 0 ml to adjust the pH to 8.5-9.5, and then 30 g of activated carbon with a particle size of 16-35 mesh (82% radius of 20 Å or more existed by nitrogen adsorption method) was added and left overnight. The activated carbon after standing was filtered to remove excess solution. Next, add this activated carbon to a 200 ml beaker and
While heating to about ℃, pH 8.5-9.5 with ammonia gas
100 ml of 0.067 W% (NH 4 ) 2 HPO 4 in water and 5.94 W%
Add 100 ml of CH 3 COONH 4 aqueous solution dropwise at a flow rate of 1 ml / min,
Furthermore, hydroxyapatite was synthesized while adjusting the pH to 8.5-9.5. As a result, 6.0% of hydroxyapatite was contained in the activated carbon.
【００２６】上記で得られたヒドロキシアパタイト含有
活性炭を使用して水中の鉛イオン除去試験を行った。通
水条件は、ヒドロキシアパタイトを含有した活性炭20g
を内径40φのカラムに詰め、SV 600/hで濃度100ppm (鉛
として) の硝酸鉛溶液を通水した。通水量と鉛イオン除
去率の関係を図１に示す。A test for removing lead ions in water was conducted using the activated carbon containing hydroxyapatite obtained above. Water flow condition is 20g activated carbon containing hydroxyapatite
Was packed in a column having an inner diameter of 40φ, and a lead nitrate solution having a concentration of 100 ppm (as lead) was passed through at SV 600 / h. The relationship between the water flow rate and the lead ion removal rate is shown in FIG.
【００２７】（実施例２、比較例１）0.16 W％ CaCl2水
溶液100ml にKH2PO4 3.0％、Na2HPO4 2.5 ％からなる緩
衝液を加えてPH 8.5に調節した後、粒度16-35mesh の活
性炭（窒素吸着法により、半径20Å以上が82％存在）30
g を加え一昼夜放置した。放置後の活性炭を濾過し、余
分な溶液を取り除いた。次に、200 mlビーカーにこの活
性炭を入れ、95℃に加熱しながら2.5 W ％ Na2HPO4水溶
液100 mlを1 ml/minの流量で滴下しながらヒドロキシア
パタイトを合成した。その結果、活性炭重量に対してヒ
ドロキシアパタイト含有量9.4 ％の活性炭が得られた。(Example 2, Comparative Example 1) A buffer solution consisting of 3.0% KH 2 PO 4 3.0% and Na 2 HPO 4 2.5% was added to 100 ml of 0.16 W% CaCl 2 aqueous solution to adjust the pH to 8.5, and then the particle size of 16- 35mesh activated carbon (82% radius of 20Å or more exists by nitrogen adsorption method) 30
g was added and left overnight. The activated carbon after standing was filtered to remove excess solution. Next, this activated carbon was placed in a 200 ml beaker, and 100 ml of a 2.5 W% Na 2 HPO 4 aqueous solution was added dropwise at a flow rate of 1 ml / min while heating at 95 ° C. to synthesize hydroxyapatite. As a result, activated carbon having a hydroxyapatite content of 9.4% based on the weight of activated carbon was obtained.
【００２８】上記で得られたヒドロキシアパタイト含有
活性炭を使用して水中の鉛イオン除去試験を行った。試
験条件は実施例１と同様で、通水量と鉛イオン除去率の
関係を図１に併せて示す。A test for removing lead ions in water was conducted using the activated carbon containing hydroxyapatite obtained above. The test conditions are the same as in Example 1, and the relationship between the water flow rate and the lead ion removal rate is also shown in FIG.
【００２９】尚、比較のためヒドロキシアパタイトを担
持させない基材の活性炭についても同様に、水中の鉛イ
オン除去試験を行った（比較例１）。その結果も併せて
図１に示す。For comparison, a lead ion removal test in water was similarly conducted on activated carbon as a base material on which hydroxyapatite was not carried (Comparative Example 1). The results are also shown in FIG.
【００３０】これらの結果より、本発明のヒドロキシア
パタイト含有活性炭で鉛イオンを含む水を処理した場
合、高い水中の鉛イオン除去性を有することが分かる。From these results, it is understood that when the water containing lead ions is treated with the hydroxyapatite-containing activated carbon of the present invention, it has a high lead ion removing property in water.
【００３１】[0031]
【発明の効果】本発明の鉛除去用活性炭は活性炭の細孔
内にヒドロキシアパタイトを含有せしめたもので、ヒド
ロキシアパタイトと水の接触面積が著しく大きい。更に
ヒドロキシアパタイトは水中の鉛イオンに対して選択的
なイオン交換性を有するため、活性炭の細孔内における
吸着力とも相まって鉛イオンの交換速度が速く、浄水器
或いは排水処理装置に取り付けて高速で通水する場合に
も浄化材として高い効果を発揮することが出来る。その
他更に基材の活性炭の作用によって、水中の悪臭物質、
残留塩素及びトリハロメタン等不純物の浄水機能もあ
る。The lead-removing activated carbon of the present invention contains hydroxyapatite in the pores of activated carbon, and the contact area between hydroxyapatite and water is extremely large. Furthermore, since hydroxyapatite has a selective ion-exchange property with respect to lead ions in water, the exchange rate of lead ions is fast in combination with the adsorptive power in the pores of activated carbon. Even when passing water, it can be highly effective as a purification material. In addition, due to the action of activated carbon as a base material, malodorous substances in water,
It also has a water purification function for impurities such as residual chlorine and trihalomethane.
【図１】通水量と鉛の除去率の関係を示す。FIG. 1 shows the relationship between the water flow rate and the lead removal rate.
１ 実施例１ ２ 実施例２ ３ 比較例１ 1 Example 1 2 Example 2 3 Comparative Example 1
Claims (2)
を生成せしめてなる水中の鉛除去用活性炭。1. Activated carbon for removing lead in water, wherein hydroxyapatite is produced in the pores of activated carbon.
てカルシウム塩を吸着せしめた後要すれば緩衝液を加え
て、pHを8.5 〜9.5 の範囲内に保持しながら、リン酸、
リン酸のアンモニウム塩、ナトリウム塩、カリウム塩及
びそれらの酸性塩からなる群より選ばれた、一種または
二種以上の化合物の溶液を加えて活性炭の細孔内にヒド
ロキシアパタイトを生成せしめることを特徴とする水中
の鉛除去用活性炭の製法。2. A method of immersing activated carbon in an aqueous solution of calcium salt to adsorb the calcium salt, and then adding a buffer solution if necessary to maintain the pH within the range of 8.5 to 9.5 while adding phosphoric acid,
Characterized by adding a solution of one or more compounds selected from the group consisting of ammonium salts, sodium salts, potassium salts of phosphoric acid and their acidic salts to generate hydroxyapatite in the pores of activated carbon A method for producing activated carbon for removing lead in water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6098019A JPH07275850A (en) | 1994-04-11 | 1994-04-11 | Activated carbon for removing lead and manufacture of the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6098019A JPH07275850A (en) | 1994-04-11 | 1994-04-11 | Activated carbon for removing lead and manufacture of the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07275850A true JPH07275850A (en) | 1995-10-24 |
Family
ID=14208156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6098019A Pending JPH07275850A (en) | 1994-04-11 | 1994-04-11 | Activated carbon for removing lead and manufacture of the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07275850A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102962027A (en) * | 2012-11-15 | 2013-03-13 | 深圳大学 | Composite material for treating wastewater and preparation method thereof |
| CN109731542A (en) * | 2019-03-13 | 2019-05-10 | 淮海工学院 | A kind of hydroxyapatite and the preparation method and application thereof with absorption heavy metal lead ion |
| CN113694885A (en) * | 2021-07-20 | 2021-11-26 | 红河学院 | Biological activated carbon-loaded hydroxyapatite composite material and application method thereof |
-
1994
- 1994-04-11 JP JP6098019A patent/JPH07275850A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102962027A (en) * | 2012-11-15 | 2013-03-13 | 深圳大学 | Composite material for treating wastewater and preparation method thereof |
| CN109731542A (en) * | 2019-03-13 | 2019-05-10 | 淮海工学院 | A kind of hydroxyapatite and the preparation method and application thereof with absorption heavy metal lead ion |
| CN113694885A (en) * | 2021-07-20 | 2021-11-26 | 红河学院 | Biological activated carbon-loaded hydroxyapatite composite material and application method thereof |
| CN113694885B (en) * | 2021-07-20 | 2023-07-18 | 红河学院 | Biological active carbon loaded hydroxyapatite composite material and application method thereof |
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