| 王竞,李丽华,吕红,金若菲,周集体,杨凤林.电聚合固定化介体催化强化2,6-二硝基甲苯生物还原[J].,2010,(6):877-882 |
| 电聚合固定化介体催化强化2,6-二硝基甲苯生物还原 |
| Enhanced biological reduction of 2,6-dinitrotoluene by catalysis of electropolymerization-immobilized redox mediators |
| |
| DOI：10.7511/dllgxb201006007 |
| 中文关键词: 固态氧化还原介体 聚吡咯 电聚合 2,6-二硝基甲苯 生物转化 |
| 英文关键词: solid redox mediator polypyrrole electropolymerization 2,6-dinitrotoluene biotransformation |
| 基金项目:国家自然科学基金资助项目(50578022；50978040). |
|
| 摘要点击次数: 1559 |
| 全文下载次数: 1285 |
| 中文摘要: |
| 难生物降解的水溶性氧化还原介体会随出水而流失，造成二次污染．采用活性炭毡(ACF)电极上电聚合吡咯单体掺杂蒽醌二磺酸盐技术制备的固定化氧化还原介体，AQDS/PPy/ACF，考察了其作为一种新型固态介体催化2,6-二硝基甲苯(2,6-DNT)生物还原的可行性．结果表明，基体材料对聚吡咯复合材料的表面形貌特性影响很大，在铂片上形成的聚吡咯呈“菜花状”，而在ACF上则呈现“微球”状；AQDS/PPy/ACF对2,6-DNT具有较强的生物催化活性和催化稳定性；它的加入可使2,6-DNT的生物还原速率提高近4倍，一级降解动力学常数达到 0.034 5 h -1 ；在该反应体系中，2,6-DNT首先被还原为中间产物2-氨基-6-硝基甲苯(2-A-6-NT)，后者再被还原为终产物2,6-二氨基甲苯(2,6-DAT)． |
| 英文摘要: |
| The continuous dosing and discharge of water-soluble redox mediators, such as biologically recalcitrant compounds, will result in the secondary contamination. The immobilized redox mediator prepared by incorporation of anthraquinonedisulphonate (AQDS) during the electropolymerization of pyrrole monomer on active carbon felt (ACF) electrode, AQDS/PPy/ACF, was used for catalyzing anaerobic biotransformation of 2,6-dinitrotoluene (2,6-DNT). The results show that the morphology of the PPy film largely depends on the surface texture of substrate materials, the PPy films depositing on Pt are characterized by a cauliflower-like structure, and those on ACF by some globular structure; AQDS/PPy/ACF exhibits good catalytic activity and stability for 2,6-DNT, the enhanced reduction rate obtained in the incubations with AQDS/PPy/ACF is about four times that of the incubations without AQDS/PPy/ACF, and the corresponding first-order reduction rate constant reaches 0.034 5 h -1 ; 2,6-DNT is reduced to be 2,6-diaminotoluene via 2-amino-6-nitrotoluene in the system. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|