Ni/Fe双金属对PCE脱氯影响因素研究

Effects of Bimetal Ni/Fe on Dechlorination of PCE

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 2 0 g时 ,反应速率常数kobs分别为 0 .0 477h-1和 0 .0 970h-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 2 0～ 40目、40～ 6 5目和 80～ 10 0目时 ,kobs分别为 0 .0 477h-1,0 .0 5 9 8h-1和 0 .0 886h-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 .0 2 4% ,0 .0 48%和 0 .0 72 %时 ,所得kobs分别为 0 .0 477h-1,0 .0 6 6 2h-1和 0 .0 73 4h-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 .

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.