JP5316645B2 - 吸着材の製造方法 - Google Patents
吸着材の製造方法 Download PDFInfo
- Publication number
- JP5316645B2 JP5316645B2 JP2011538113A JP2011538113A JP5316645B2 JP 5316645 B2 JP5316645 B2 JP 5316645B2 JP 2011538113 A JP2011538113 A JP 2011538113A JP 2011538113 A JP2011538113 A JP 2011538113A JP 5316645 B2 JP5316645 B2 JP 5316645B2
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- Prior art keywords
- cerium
- carrier
- adsorbent
- supporting
- graft
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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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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Description
本発明に係る吸着材の製造方法では、セリウムを担持可能な官能基を有する担体に、3価のセリウムを担持させるセリウム担持工程と、担持した上記セリウムを酸化して、当該セリウムの価数を4価にするセリウム酸化工程とを含む。このため、取り扱いが困難である4価のセリウム塩を用いることなく、4価のセリウムを担持した吸着材を製造することができる。
担体作製工程は、上記担体を製造することができればどのような方法であってもよい。
本実施の形態では、まず、活性化工程において、結晶化度が80%以上のセルロースを主成分とする粒子状セルロース系基材を活性化する。
上記活性化工程で活性化された粒子状セルロース系基材は、グラフト鎖導入工程で、エチレン性不飽和モノマーと接触させて、当該エチレン性不飽和モノマーを上記粒子状セルロース系基材にグラフト重合させる。これにより、上記粒子状セルロース系基材にグラフト鎖が導入される。
官能基結合工程では上記グラフト鎖導入工程で導入された上記グラフト鎖に、セリウムを担持可能な官能基を結合させる。
セリウム担持工程は、セリウムを担持可能な官能基を有する担体に3価のセリウムを担持させることができれば、どのような条件下で行ってもよい。例えば、セリウム担持工程では、水溶性である3価のセリウム塩の水溶液を用いて上記担体に3価のセリウムを担持させることが好ましい。
セリウム酸化工程は、上記セリウム担持工程によって得られた、3価のセリウムを担持した担体を酸化処理することによって、担体において担持されたセリウムを3価から4価へと酸化させる工程である。例えば、上述したセルロース基材にセリウムを担持した吸着材の場合では、酸化処理後、セリウムは3価から4価になることによって吸着材の表面の色が白色から濃い茶色となる。
本発明に係る吸着材は、セリウムを担持可能な官能基を有する担体と、当該担体に担持された4価のセリウムとを含み、担体が4価のセリウムとキレート形成している。当該吸着材は、上述した製造方法によって製造することができる。
本発明に係る吸着処理方法は、水中に存在するヒ素の吸着処理方法であって、上述した本発明に係る吸着材を用いる。
グラフト率、即ち、粒子状セルロース系基材に対する、グラフト重合により導入されているエチレン性不飽和モノマーの量(質量百分率)は、以下の方法で求めた。
グラフト率(%)=((Wg−W0)/W0)×100
<担体1g中に含まれるセリウムを担持可能な官能基の量>
担体1g中に含まれるセリウムを担持可能な官能基の量は、上記方法で求めた粒子状セルロース系基材のグラフト重合物の質量(Wg、単位:g)、セリウムを担持可能な官能基の当量(M)、セリウムを担持可能な官能基を結合し洗浄乾燥して得られた担体の質量(Wp、単位:g)から次式により算出した。
<セリウムの担持率>
セリウムの担持率、即ち、吸着材の質量に対する、担持されたセリウムの量(質量百分率)は、用いた担体の質量(Wp)と、得られた吸着材の質量(Wq)から次式により算出した。
セリウムの担持率(質量%)=((Wq−Wp)/Wq)×100
〔実施例1〕
微結晶セルロースのみから構成されるセルロース微粒子(直径:200〜300μm、製品名:セルフィア(登録商標)、旭化成ケミカルズ社製、結晶化度:99%以上)を、薄いプラスチックバッグの中に配置して、当該バッグを窒素で数回パージし、密封した。
実施例1で得た吸着材CCM−Asを用いて、以下のようなヒ素のバッチ吸着実験を行った。
市販の3価のヒ素標準液を純水で希釈して、5ppmの3価のヒ素溶液を調製した(初期pH:6.5前後)。
市販の5価のヒ素標準液を純水で希釈して、5ppmの5価のヒ素溶液を調製した(初期pH:6.5前後)。
Claims (8)
- セリウムを担持可能な官能基を有する担体に、3価のセリウムを担持させるセリウム担持工程と、
担持した上記セリウムを酸化して、当該セリウムの価数を4価にするセリウム酸化工程と、
を含むことを特徴とする吸着材の製造方法。 - セリウムを担持可能な官能基を有する上記担体を作製する担体作製工程を更に含み、
上記担体作製工程は、
結晶化度が80%以上のセルロースを主成分とする粒子状セルロース系基材を活性化する活性化工程と、
活性化された粒子状セルロース系基材を、エチレン性不飽和モノマーと接触させることにより、当該エチレン性不飽和モノマーを上記粒子状セルロース系基材にグラフト重合させてグラフト鎖を導入するグラフト鎖導入工程と、
導入された上記グラフト鎖にセリウムを担持可能な官能基を結合させる官能基結合工程とを含むことを特徴とする請求項1に記載の吸着材の製造方法。 - 上記グラフト鎖導入工程では、活性化された粒子状セルロース系基材を、エチレン性不飽和モノマーを含むエマルションと接触させることにより、当該エチレン性不飽和モノマーを上記粒子状セルロース系基材にグラフト重合させてグラフト鎖を導入することを特徴とする請求項2に記載の吸着材の製造方法。
- 上記セルロース系基材の結晶化度が95%以上であることを特徴とする請求項2または3に記載の吸着材の製造方法。
- セリウムを担持可能な上記官能基が、イミノニ酢酸基、リン酸基、スルホン酸基、及びホスホン酸基からなる群から選択される少なくとも1種であることを特徴とする請求項1〜4の何れか1項に記載の吸着材の製造方法。
- セリウム担持工程では、3価の水溶性セリウム塩を用いて、3価のセリウムを担体に担持させることを特徴とする請求項1〜5の何れか1項に記載の吸着材の製造方法。
- 上記セリウム担持工程では、担体のセリウム担持率が2〜20質量%の範囲内となるように担持させることを特徴とする請求項1〜6の何れか1項に記載の吸着材の製造方法。
- 上記セリウム酸化工程を、セリウムを担持した担体を酸化剤水溶液と接触させる方法、セリウムを担持した担体をオゾンガスと接触させる方法、セリウムを担持した担体に対してUVを照射する方法、又はセリウムを担持した担体に対して電子ビームを照射する方法によって行うことを特徴とする請求項1〜7の何れか1項に記載の吸着材の製造方法。
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JPS61187931A (ja) * | 1985-02-18 | 1986-08-21 | Asahi Chem Ind Co Ltd | 水溶液中の砒素の吸着剤 |
JPH04317738A (ja) * | 1991-04-16 | 1992-11-09 | Agency Of Ind Science & Technol | フッ化物イオン吸着材の製造法 |
JP2000024647A (ja) * | 1998-07-08 | 2000-01-25 | Chiyoda Corp | 水中に溶解した砒素を吸着除去する方法 |
JP2003225559A (ja) * | 2001-06-21 | 2003-08-12 | Japan Science & Technology Corp | 植物バイオマスを原料とする吸着剤 |
JP2007130607A (ja) * | 2005-11-11 | 2007-05-31 | National Institute Of Advanced Industrial & Technology | 有機イオウ化合物吸着剤の製造方法 |
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JPS61187931A (ja) * | 1985-02-18 | 1986-08-21 | Asahi Chem Ind Co Ltd | 水溶液中の砒素の吸着剤 |
JPH04317738A (ja) * | 1991-04-16 | 1992-11-09 | Agency Of Ind Science & Technol | フッ化物イオン吸着材の製造法 |
JP2000024647A (ja) * | 1998-07-08 | 2000-01-25 | Chiyoda Corp | 水中に溶解した砒素を吸着除去する方法 |
JP2003225559A (ja) * | 2001-06-21 | 2003-08-12 | Japan Science & Technology Corp | 植物バイオマスを原料とする吸着剤 |
JP2007130607A (ja) * | 2005-11-11 | 2007-05-31 | National Institute Of Advanced Industrial & Technology | 有機イオウ化合物吸着剤の製造方法 |
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