纳米Pd修饰碳毡阴极对四溴双酚A的电化学脱溴  

Electrochemical debromination of tetrabromobisphenol A by nano-Pd-modified carbon felt cathode

作　　者：秦庆东[1] 张家萱 徐健[1] 许妍[1] Qin Qingdong;Zhang Jiaxuan;Xu Jian;Xu Yan(School of Civil Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]东南大学土木工程学院,南京211189

出　　处：《东南大学学报（自然科学版）》2022年第5期917-923,共7页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(41671468)。

摘　　要：为提高碳毡阴极的催化活性,采用电沉积法在碳毡阴极上负载纳米Pd,用于电化学还原降解四溴双酚A(TBBPA).借助扫描电子显微镜(SEM)、X射线光电子能谱仪(XPS)、线性扫描伏安法(LSV)和电化学阻抗谱(EIS)对纳米Pd修饰碳毡阴极的形貌、元素组成和电化学性能进行了表征,研究了Pd负载量、阴极电位、TBBPA初始浓度、pH值等因素对TBBPA降解的影响.结果表明:Pd颗粒平均粒径为27 nm,表面Pd由0价和+2价2种价态组成,电极的催化性能得到显著提升;TBBPA的去除率随Pd负载量、阴极电位和TBBPA初始浓度的升高呈先增加后降低的趋势,随pH值的升高而降低;当Pd负载量为0.104 mg/cm~2、阴极电位为-1.5 V、pH值为2时,初始质量浓度为5 mg/L的TBBPA在60 min内去除率为87.6%;TBBPA的降解机理主要为电子直接还原和活性氢间接还原,并最终生成双酚A.采用纳米Pd修饰碳毡阴极可增强TBBPA的电化学脱溴.To improve the catalytic activity of carbon felt cathode, a nano-Pd was loaded on carbon felt cathode by electrodeposition method for electrochemical reduction degradation of tetrabromobisphenol A(TBBPA). Scanning electron microscopy(SEM), X-ray photoelectron spectroscopy(XPS), linear sweep voltammetry(LSV), and electrochemical impedance spectroscopy(EIS) were used to characterize the morphology, elemental composition and electrochemical performance of nano-Pd-modified carbon felt cathode. The effects of Pd load, cathode potential, initial concentration of TBBPA, and pH value on the degradation of TBBPA were studied. The results show that the average particle size of Pd particles is 27 nm, the valence states are 0 and +2 for surface Pd, and the catalytic activity of the electrode is significantly improved. The removal rates of TBBPA first increase and then decrease with the increase of Pd load, cathode potential and initial TBBPA concentration, and decrease with the increase of pH value. When the Pd load is 0.104 mg/cm~2, the cathode potential is-1.5 V, and the pH value is 2, the TBBPA removal rate is 87.6% within 60 min with the initial mass concentration of 5 mg/L. The degradation mechanism of TBBPA on nano-Pd-modified carbon felt cathode is mainly direct reduction of electron transfer and indirect reduction of the reactive hydrogen, and the final product is bisphenol A. The electrochemical debromination of TBBPA can be enhanced by using nano-Pd-modified carbon felt cathode.

关 键 词：四溴双酚A 纳米Pd 碳毡 电化学脱溴 机理 

分 类 号：X703.5[环境科学与工程—环境工程]