Parshetti G K, Doong R A
Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu 30013, Taiwan.
Water Sci Technol. 2008;58(8):1629-36. doi: 10.2166/wst.2008.543.
Highly reactive nanoscale Ni/Fe nanoparticles were synthesized on microfiltration membranes for dechlorination of 20 mg/L trichloroethylene (TCE). Complete degradation of TCE was achieved within 25 min by Nylon 66 membrane with the production of ethane as a major degradation product, depicting that hydrodechlorination is the major reaction mechanism for TCE dechlorination. In addition, the carbon mass balance can be reached to 93%. The surface-area-normalized rate constant (kSA) for TCE degradation by Ni/Fe immobilized on Nylon 66 was 0.172 L h(-1) m(-2), which is higher than that by Ni/Fe in solution. Further TEM and SEM-EDS analyses show that Nylon 66 can retain higher amounts of Ni on the surface of membrane. In addition, the efficiency and rate for TCE dechlorination increased upon increasing mass loading of Ni from 2.5 to 20 wt%. Results obtained in this study clearly demonstrate that the use of Nylon 66 as the support for immobilization of bimetallic Ni/Fe nanoparticles has a good catalytic activity for dechlorination of TCE.
在微滤膜上合成了高活性的纳米级镍铁双金属纳米颗粒用于对20mg/L三氯乙烯（TCE）进行脱氯处理。尼龙66膜在25分钟内实现了TCE的完全降解，主要降解产物为乙烷，这表明加氢脱氯是TCE脱氯的主要反应机制。此外，碳质量平衡可达93%。固定在尼龙66上的镍铁双金属对TCE降解的比表面积归一化速率常数（kSA）为0.172L h(-1) m(-2)，高于溶液中镍铁双金属的该常数。进一步的透射电子显微镜（TEM）和扫描电子显微镜-能谱分析（SEM-EDS）表明，尼龙66能在膜表面保留更多的镍。此外，随着镍的质量负载从2.5wt%增加到20wt%，TCE脱氯的效率和速率提高。本研究结果清楚地表明，使用尼龙66作为负载双金属镍铁纳米颗粒的载体对TCE脱氯具有良好的催化活性。
