Reductive dechlorination of γ-hexachlorocyclohexane using Fe-Pd bimetallic nanoparticles
Reductive dechlorination of γ-hexachlorocyclohexane using Fe-Pd bimetallic nanoparticles
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DOI：
10.1016/j.jhazmat.2009.10.063
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发表时间：
2010-03-15
影响因子：
13.6
通讯作者：
Paknikar, Kishore M.
中科院分区：
文献类型：
--
作者：
Nagpal, Varima;Bokare, Alok D.;Paknikar, Kishore M.
合成了纳米Fe-Pd/TiO 2复合粒子，并将其用于降解水中的六六六。结果表明，当催化剂负载量为0.5g/L时，5 mg/L的亚麻油在5 min内完全脱氯，降解过程符合一级动力学。GC-MS分析与GC-ECD结果确证，结果显示存在环己烷作为最终降解产物。提出的锂还原脱氯机理涉及Fe腐蚀诱导的氢原子从Pd表面转移。Fe-Pd纳米颗粒的增强的降解效率归因于：（1）纳米级金属颗粒的高比表面积（60 m2/g），比商业级微米级或毫米级铁颗粒（类似于1.6 m2/g）大许多倍;以及（2）由于表面上I'd的存在而增加的催化反应性。回收和柱研究表明，这些纳米粒子表现出有效和持续的催化活性。(C)2009爱思唯尔有限公司版权所有。
Nanoscale Fe-Pd bimetallic particles were synthesized and used for degradation of lindane (gamma-hexachlorocyclohexane) in aqueous solution. Batch studies showed that 5 mg/Lof lindane was completely dechlorinated within 5 min at a catalyst loading of 0.5 g/L and the degradation process followed first-order kinetics. GC-MS analysis in corroboration with GC-ECD results showed the presence of cyclohexane as the final degradation product. The proposed mechanism for the reductive dechlorination of lindane involves Fe corrosion-induced hydrogen atom transfer from the Pd Surface. The enhanced degradation efficiency of Fe-Pd nanoparticles is attributed to: (1) high specific surface area of the nanoscale metal particles (60 m(2)/g), manyfold greater that of commercial grade micro- or milli-scale iron particles (similar to 1.6 m(2)/g); and, (2) increased catalytic reactivity due to the presence of I'd on the Surface. Recycling and column studies showed that these nanoparticles exhibit efficient and sustained catalytic activity. (C) 2009 Elsevier B.V. All rights reserved.