摘要
以TiO_(2)、Al_(2)O_(3)、CeO_(2)和SiO_(2)为载体,采用浸渍法制备Pd基催化剂,并通过透射电镜(TEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)和电感耦合等离子体发射光谱(ICP-OES)等手段对催化剂的结构进行了详细表征.以Pd/TiO_(2)为催化剂,研究四溴双酚A(TBBPA)在阴极池的电催化还原.结果表明,悬浮体系中Pd基催化剂的催化活性远高于固定体系;与其他载体相比,Pd/TiO_(2)的电催化还原活性最高;反应过程符合Langmuir-Hinshelwood模型,受控于TBBPA在催化剂表面的吸附过程;随着恒定电流和Pd负载量的增大,TBBPA电催化还原反应的初活性呈现火山型变化规律;经过5次循环使用,Pd/TiO_(2)催化剂仍能够完全去除TBBPA,具有良好的稳定性.
We prepared Pd based catalysts by the impregnation method with TiO_(2),Al_(2)O_(3),CeO_(2) and SiO_(2) as the supports,and the structural properties of the catalysts were characterized by TEM,XRD,XPS and ICP-OES.The electrocatalytic debromination of tetrabromobisphenol A(TBBPA)was studied on Pd/TiO_(2).The results showed that the activity of Pd/TiO_(2)catalyst in suspension system was much higher than that in fixed system.The Pd/TiO_(2)catalyst had the highest electrocatalytic debromination activity among the test catalysts.The reaction process complied with the Langmuir-Hinshelwood model,and was controlled by the adsorption of TBBPA on the catalyst surface.With the increase of constant current and loading amounts of Pd,the initial activity of the catalyst for electrocatalytic reduction of TBBPA displayed a volcano-type dependency.Furthermore,complete debromination of TBBPA could be achieved on suspended Pd/TiO_(2)catalyst after five catalyst cycles,suggesting very high catalyst stability.
作者
胡佳佳
孙玉菡
万玉秋
郑寿荣
HU Jiajia;SUN Yuhan;WAN Yuqiu;ZHENG Shourong(State Key Laboratory of Pollution Control and Resource Reuse Research,College of the Environment,Nanjing University,Nanjing,210023,China)
出处
《环境化学》
CAS
CSCD
北大核心
2023年第7期2251-2261,共11页
Environmental Chemistry
基金
国家自然科学基金(21976086)资助.
