摘要
实验研究了Pd修饰Ti电极对甲醇/水相中十六烷基三甲基溴化铵(CTAB)增溶的2,4,5-PCB(PCB:多氯联苯)的电化学还原脱氯作用.采用两室流通式电解池,考察了Pd负载量、电极结构、电场条件和溶液流速对2,4,5-PCB的去除效率的影响.优化条件是:Pd负载量为3mg·cm-2,阴极为3层电极极板,电极电位为-1.10V(vsSCE);溶液流速对脱氯效率的影响不明显.在该条件下经过9h电解,2,4,5-PCB的去除率达96.2%,脱氯产物未完全生成联苯,其产率为89.6%,电流效率介于11.3%￣33.0%之间.
Electrocatalytic reductive dechlorination of 2,4,5-PCB （PCB ： polychlorinated biphenyls） in aqueous solution containing methanol and hexadecyltrimethyl ammonium bromide （CTAB） was studied in a Teflon-made two-compartment flow-through cell with a palladium-loaded permeable titanium mini mesh cathode and a platinum foil anode. The experiments were carried out to explore the effects of palladium loading, electrode structure, applied cathode potential and catholyte flow rate on dechlorination. The results indicated that the optimal conditions were 3 mg Pd loading/cm^2 geometric area, three-layer cathode and -1.10 V （vs SCE） controlled potential. After 9 h electrocatalytic reduction under the optimal conditions, the dechlorination rate of 2,4,5-PCB reached 96.2%, but the conversion rate to biphenyl was 89.6%. The current efficiency changed between 11.3% and 33.0% during the electrocatalytic reduction.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2006年第3期306-311,共6页
Acta Physico-Chimica Sinica
基金
国家重点基础研究规划项目(973)(G1999045711)
高等学校博士学科点专项科研基金(20040003042)资助
