Optimization of nano-scale nickel/iron particles for the reduction of high concentration chlorinated aliphatic hydrocarbon solutions
Optimization of nano-scale nickel/iron particles for the reduction of high concentration chlorinated aliphatic hydrocarbon solutions
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DOI：
10.1016/j.chemosphere.2010.01.044
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发表时间：
2010-04-01
期刊：
影响因子：
8.8
通讯作者：
Thompson, Ian P.
中科院分区：
文献类型：
--
作者：
Barnes, Robert J.;Riba, Olga;Thompson, Ian P.
纳米颗粒作为环境修复手段的使用仍然为污染沃茨的处理提供了一种相对新颖的方法。目前的研究比较了微米级的铁，纳米级的铁和纳米级的镍/铁（镍/铁）颗粒的反应性，专门用于脱氯的解决方案，含有350毫克L-1的三氯乙烯（浓度测量在英国德比郡的污染场地）。结果表明，采用1 g L-1的反应性材料的脱氯在monoclonal形式（微米和纳米尺度）表现出非常小的还原能力相比，纳米Ni/Fe纳米尺度的颗粒，含有28.9%的Ni（摩尔），实现完全脱氯的TCE在溶液中在576 h内。还进行了实验以确定用于TCE还原的Ni/Fe颗粒的最佳混合物组成。这表明，3.2%的Ni是最佳的Ni/Fe摩尔比，最大的脱卤性能和最小的镍释放到溶液中。使用最有效的TCE组合物的颗粒，进行实验以确定最佳TCE降低所需的浓度。在测试的纳米级颗粒浓度范围内（0.1-9 g L-1），三氯乙烯的减少率随着三氯乙烯：纳米级颗粒比例的增加而增加。然而，1-3克L-1的浓度范围被选为最合适的现场补救，因为更集中的解决方案表现出只有小的反应速率增加。最后，为了测试3.2%Ni/Fe纳米级颗粒的长期性能和反应性，将350 mg L-1 TCE的每周峰值注入3 g L-1纳米级颗粒间歇反应器中。结果表明，纳米级颗粒具有减少1750 mg L-1 TCE的能力，并保持活性至少13周。(C)2010爱思唯尔有限公司保留所有权利。
The use of nano-scale particles as a means of environmental remediation still provides a comparatively novel approach for the treatment of contaminated waters. The current study compares the reactivity of micro-scale Fe, nano-scale Fe and nano-scale Ni/Fe (nickel/iron) particles specifically for dechlorination of solutions containing 350 mg L-1 of TCE (concentration measured at a contaminated site in Derbyshire, UK). The results indicated that employing 1 g L-1 of reactive material for dechlorination in the monometallic form (both micro- and nano-scale) exhibited very little reduction capability compared with the bimetallic Ni/Fe nano-scale particles, containing 28.9% Ni (in molar), which achieved complete dechlorination of the TCE in solution within 576 h. Experiments were also performed to determine the optimum bimetallic composition of the Ni/Fe particles for TCE reduction. This revealed that 3.2% Ni was the optimum Ni/Fe molar ratio for both maximum dehalogenation performance and minimum release of Ni into solution. Using particles of the most effective bimetallic composition, experiments were carried out to determine the concentration required for optimal TCE reduction. Over the range of nano-scale particle concentrations tested (0.1-9 g L-1), reduction rates of TCE increased with greater TCE:nano-scale particle ratios. However, a concentration range of 1-3 g L-1 was selected as the most appropriate for site remediation, since more concentrated solutions demonstrated only small increases in rates of reaction. Finally, in order to test the long term performance and reactivity of the 3.2% Ni/Fe bimetallic nano-scale particles, weekly spikes of 350 mg L-1 TCE were injected into a 3 g L-1 nano-scale particle batch reactor. Results showed that the bimetallic nano-scale particles had the ability to reduce 1750 mg L-1 TCE and remained active for at least 13 weeks. (C) 2010 Elsevier Ltd. All rights reserved.