纳米镍/铁对四氯乙烯快速脱氯试验

Rapid Reduction of Tetrachloroethene Using Nano-scale Ni/Fe Bimetallic Particles

实验室合成的纳米Ni/Fe(粒径20～60 nm,比表面积为52.61 m2/g),在固液比相对较低条件下(5.4 g/L),对四氯乙烯(PCE)能够快速并完全脱氯,在6 h时,脱氯率为99.70%,反应符合准一级反应动力学方程,标准化反应速率常数kSA为3.04 mL·m-2·h-1.反应过程中水样未检测到其他的氯代中间产物或最终产物,无毒的烃类乙烷(C2H6)是主要产物,约占加入时PCE总碳质量的94%～110%.试验结果说明加氢催化剂Ni的存在,通过原电池腐蚀作用提高了脱氯速率并同时增加了良性产物的产量(如C2H6).

Specific surface area of the synthesized nano-scale N i/ Fe was 52.61 m 2/g ,with a diameter from 20 to 60 nm. Rapid and complete de chlorination was achieved for tetrachloroethene( PCE) at relatively low metal to solution ratio (5.4 g/L). The dechlorination rate for tetrachloroethene is 99.7 0% with 6 h. The reaction followed a pseudo-first-order kinetics. Values of th e surface-area-normalized rate coefficient(k SA) was 3.04 mL·m -2·h -1. Ethane was the primary product from the reaction, amount to 9 4%~110%. No chlorinated intermediates or final products were detected above the method detection limit (<0.05 μg/L).Nickel enhanced the reaction rates throu gh the galvanic corrosion and increased the productivity of benign compounds.