Ni/Fe双金属对PCE脱氯影响因素研究

以四氯乙烯(PCE)为目标污染物, 利用批试验研究Ni/Fe双金属对氯代烃脱氯的影响因素.结果表明: (1)当参加反应的Ni/Fe双金属分别为10 g和20 g时, 反应速率常数k_obs分别为0.047 7 h-1和0.097 0 h-1, 说明增加参加反应的Ni/Fe双金属的质量可提高脱氯速率; (2)当粒度分别为20~ 40目、40~ 65目和80~ 100目时, k_obs分别为0.047 7 h-1, 0.059‥ 8 h-1和0.088 6 h-1, 说明选用Ni/Fe双金属颗粒越小脱氯速率越快; (3)当Ni/Fe质量比分别为0.024%, 0.048%和0.072%时, 所得k_obs分别为0.047 7 h-1, 0.066 2 h-1和0.073 4 h-1, 说明Ni/Fe双金属系统中Ni/Fe质量比越高脱氯效果越好, 但最优Ni/Fe质量比还有待于进一步研究. 

Effects of Bimetal Ni/Fe on Dechlorination of PCE

In order to study the affecting factors in the degradation of chlorinated hydrocarbon, tetrachlrethene (PCE) was selected as target contaminant and Ni/Fe bimetal was used as reactants in batch experiments. The results show: (1) When the mass of Ni/Fe bimetal used in batch experiment was 10 g and 20 g, the reaction rates (k obs ) were 0.047 7 h -1 and 0.09 7 h -1 , respectively. The more the Ni/Fe bimetal used in PCE degradation, the faster the reaction. (2) The reaction rates (k obs ) were 0.047 7 h -1 , 0.059 8 h -1 and 0.088 6 h -1 when Ni/Fe bimetal was 20-40 mesh, 40-65 mesh and 80-100 mesh, respectively. The finer the metal, the faster the reaction. (3) The reaction rates (k obs ) were 0.047 7 h -1 , 0.066 2 h -1 and 0.073 4 h -1 when the Ni/Fe mass ratio was 0.024%, 0.048% and 0.072%, respectively. The higher the Ni/Fe mass ratio, the faster the reaction. Further study of the optimum Ni/Fe mass ratio is needed.