JP6330416B2 - ヒ素吸着性樹脂粒子 - Google Patents
ヒ素吸着性樹脂粒子 Download PDFInfo
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- JP6330416B2 JP6330416B2 JP2014067134A JP2014067134A JP6330416B2 JP 6330416 B2 JP6330416 B2 JP 6330416B2 JP 2014067134 A JP2014067134 A JP 2014067134A JP 2014067134 A JP2014067134 A JP 2014067134A JP 6330416 B2 JP6330416 B2 JP 6330416B2
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- JP
- Japan
- Prior art keywords
- arsenic
- resin particles
- parts
- adsorption
- water
- 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.)
- Expired - Fee Related
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- 229910052785 arsenic Inorganic materials 0.000 title claims description 86
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims description 83
- 239000002245 particle Substances 0.000 title claims description 70
- 239000011347 resin Substances 0.000 title claims description 67
- 229920005989 resin Polymers 0.000 title claims description 67
- 230000000274 adsorptive effect Effects 0.000 title description 2
- 238000000034 method Methods 0.000 claims description 29
- 239000000696 magnetic material Substances 0.000 claims description 22
- 238000005349 anion exchange Methods 0.000 claims description 14
- 239000013522 chelant Substances 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 7
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims description 3
- 125000003277 amino group Chemical group 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims description 2
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- 238000001000 micrograph Methods 0.000 claims 1
- 238000001179 sorption measurement Methods 0.000 description 44
- -1 phosphorus compound Chemical class 0.000 description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 33
- 239000000243 solution Substances 0.000 description 29
- 239000003463 adsorbent Substances 0.000 description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
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- 230000000052 comparative effect Effects 0.000 description 13
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- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
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Images
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Description
(粒子状磁性材料)
本発明の樹脂粒子は、粒子状磁性材料を含む。本発明に用いられる磁性材料としては特に制限はなく、磁性を示すあらゆる材料を用いることができる。例えば鉄、ニッケル、コバルト等の金属またはこれらを主成分とする磁性合金の粉末、四三酸化鉄、三二酸化鉄、コバルト添加酸化鉄、バリウムフェライト、ストロンチウムフェライト等の金属酸化物系磁性体の粉末が挙げられる。好ましくは鉄を主成分とする磁性体であり、より好ましくは四三酸化鉄である。
本願発明の樹脂粒子は、重合反応中に粒子状磁性材料と複合化できる樹脂であって、重合化後にキレート部位および陰イオン交換部位を導入することのできる官能基を有する樹脂をベース樹脂として含む。ベース樹脂には、ラジカル重合性のあるスチレン系化合物やアクリル系化合物が利用できる。
上述のように形成された粒子状磁性材料を含む樹脂粒子は、さらにキレート部位を備える。ヒ素に対するキレート基として用いられるものは、N−メチル−D−グルカミン、グルカミン、エタノールアミン、イミノジエタノール等から誘導されるアミノポリオール基が挙げられる。中でもN−メチル−D−グルカミンから誘導される基が好ましい。これらのキレート部位は、ベース樹脂のハロゲン等の反応性官能基にアミノポリオール化合物を反応させて導入することができる。
本発明の樹脂粒子は、さらに陰イオン交換部位を備える。陰イオン交換部位として、第1級、第2級、および第3級アミノ基を用いることができる。例えば、トリメチルアミノ基、トリエチルアミノ基およびエタノールアミノ基を用いることができる。中でもトリエチルアミノ基が好ましい。これらの陰イオン交換部位は、ベース樹脂のハロゲン等の反応性官能基にアミン化合物を反応させて導入することができる。
吸着材をヒ素含有溶液と接触させる方法について、特に制限はないが、タンク中にヒ素含有溶液と本発明の樹脂粒子を添加し、攪拌後、磁気分離する方法が操作の簡便性から好ましい。本発明の樹脂粒子の添加量は、溶液のヒ素含有量に合わせて調整される。例えば、濃度3mg/リットルのヒ素含有溶液(pH7)を処理する場合、本発明の吸着材は体積比で約500倍の排水を処理することができる。また、吸着材とヒ素含有溶液との接触時間は30分以上とすることが好ましい。30分未満ではヒ素除去が低いレベルにとどまることがある。
クロロメチルスチレン90モル部に1,6−ビス(アクリロイルオキシ)ヘキサン10モル部およびジメチル−2,2′−アゾビス(イソブチレート)2モル部を予め添加した原料モノマー70部に四三酸鉄ナノ粒子(平均粒径<50nm)30部を混合し、超音波を照射して均一に分散させた。これを、ポリビニルアルコール(重合度1500)0.5部、塩化ナトリウム0.5部を溶解したイオン交換水600部に添加し、ホモジナイザーで500rpm×1分間撹拌して懸濁溶液とした後、80℃で4時間加熱した。生成物は、水洗後、乾燥させ、ふるいによる分級の結果、全体の44%に相当する、粒径300μmから400μmの大きさの樹脂粒子を中間体1(参考例1)とした。
クロロメチルスチレン80モル部とスチレン20モル部にジメチル−2,2′−アゾビス(イソブチレート)2モル部を予め添加した原料モノマーを、ポリビニルアルコール(重合度1500)0.5部、塩化ナトリウム0.5部を溶解したイオン交換水1000部に添加した。これを、ホモジナイザーで500rpm×1分間撹拌して懸濁溶液とした後、80℃で4時間加熱した。生成物は、水洗後、乾燥させ、ふるいによる分級において全体の40%に相当する、粒径100μmから300μmの大きさの樹脂粒子を参考例2とした。得られた参考例2の樹脂粒子のヒ素吸着試験を参考例1と同様の条件で行った。結果を表1および図1に示す。
ジビニルベンゼン100部にジメチル−2,2′−アゾビス(イソブチレート)2モル部を予め添加した原料モノマー65部に平均粒径が200nmの四三酸鉄粒子35部を混合し、超音波を照射して均一に分散した。これをポリビニルアルコール(重合度1500)0.5部、塩化ナトリウム0.5部を溶解したイオン交換水600部に添加し、ホモジナイザーで500rpm×1分間撹拌して懸濁溶液とした後に、80℃で4時間加熱した。生成物は、水洗後、乾燥させ、ふるいによる分級において全体の82%に相当する、粒径50μmから300μmの大きさの樹脂粒子を参考例3とした。得られた参考例3の樹脂粒子のヒ素吸着試験を参考例1と同様の条件で行った。結果を表1および図1に示す。
N−メチル−D−グルカミン6部、アセトン30部、水15部を予め混合して調整した反応溶液に上記中間体1を10部加え2時間還流した。生成物は、水洗後、磁石により集めて乾燥させ、中間体2を得た。
クロロメチルスチレン95モル部に1,6−ビス(アクリロイルオキシ)ヘキサン5モル部およびジメチル−2,2′−アゾビス(イソブチレート)2モル部を予め添加した原料モノマー70部に四三酸鉄ナノ粒子(平均粒径<50nm)30部を混合し、超音波を照射し均一に分散した。これを、ポリビニルアルコール(重合度1500)0.5部、塩化ナトリウム0.5部を溶解したイオン交換水600部に添加し、ホモジナイザーで500rpm×1分間撹拌して懸濁溶液とした後、80℃で4時間加熱した。生成物は、水洗後、乾燥させ、ふるいによる分級の結果、全体の53%に相当する、粒径300μmから400μmのものを中間体1’とした。
ヒ素吸着材料として中間体2を用いる他は実施例1と同様にヒ素吸着試験を行った。結果を表2及び図2に示す。
実施例2の吸着材35μLを、和光純薬製ヒ素標準液(1,000ppm)を用いてヒ素イオン濃度3ppm、pHを3.0、7.0、11.0にそれぞれ調製した水溶液20mLに加え、室温で15時間振とうした。その後、樹脂粒子を集磁し、デカンテーションにより水相を取り出した。水相のヒ素イオン濃度を原子吸光高度計によりグラファイト炉原子化法で求め、残存ヒ素濃度を測定した。結果を表3および図3に示す。
実施例3で使用した、使用済みの樹脂粒子に1M水酸化ナトリウム水溶液を20mg加え、5時間振とうし、再生させた後、樹脂粒子を集磁し、デカンテーションにより水相を取り出した。さらに純水を加え数回洗浄し、洗液が中性になったら、樹脂粒子を集磁し、デカンテーションにより水相を取り出し、再び実施例3と同じ吸着試験方法でヒ素を再吸着させた。吸着と再生の工程を6回繰り返し、7回目の再吸着試験を行った際の結果を表3および図3に示す。
ヒ素吸着材料として三菱化学(株)製ダイアイオンCRB03を35μL用いて、実施例3と同様に調整したヒ素水溶液20mLに加え、室温で15時間振とうした。その後、静置し、デカンテーションにより水相を取り出した。取り出した水相のヒ素イオン濃度は実施例3と同様の方法で測定した。結果を表3および図3に示す。
比較例2で使用した、使用済みの樹脂粒子に1M水酸化ナトリウム水溶液を20mg加え、5時間振とうし、再生させた後、デカンテーションにより水相を取り出した。さらに純水を加え数回洗浄し、洗液が中性になったら、デカンテーションにより水相を取り出し、再び実施例3と同じ吸着試験方法でヒ素を再吸着させた。吸着と再生の工程を6回繰り返し、7回目の再吸着試験を行った際の結果を表3および図3に示す。
ヒ素吸着材料としてオルガノ(株)製強塩基性イオン交換樹脂IRA402BLを35μL用いた他は比較例2と同じ条件で試験を行った。結果を表3および図3に示す。
比較例3で使用した、使用済みの樹脂粒子に1M水酸化ナトリウム水溶液を20mg加え、5時間振とうし、再生させた後、デカンテーションにより水相を取り出した。さらに純水を加え数回洗浄し、洗液が中性になったら、デカンテーションにより水相を取り出し、再び実施例3と同じ吸着試験方法でヒ素を再吸着させた。吸着と再生の工程を6回繰り返し、7回目の再吸着試験を行った際の結果を表3および図3に示す。
Claims (4)
- 粒子状磁性材料を含む樹脂粒子であって、キレート部位および陰イオン交換部位を備えた樹脂粒子であり、前記キレート部位は、アミノポリオール基であり、前記陰イオン交換部位は、アミノ基である、樹脂粒子。
- 前記粒子状磁性材料は、透過型電子顕微鏡画像の観察により測定された平均粒径が1〜100nmである請求項1に記載の樹脂粒子。
- 前記樹脂粒子は、直径300μm〜400μmである、請求項1または2に記載の樹脂粒子。
- 上記請求項1〜3のいずれか一項に記載の樹脂粒子を用いてヒ素含有水溶液中のヒ素を除去する方法。
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