• 关键词：电催化还原  粒子电极  Br₃^-去除  原子氢  纳米Pd/Al₂O₃

• 基金项目：国家自然科学基金（No.51478455）

• 童雅婷
• 1. 河北工业大学土木工程学院, 天津 300401;2. 中国科学院生态环境研究中心, 中国科学院饮用水科学与技术重点实验室, 北京 100085

• 冒冉
• 中国科学院生态环境研究中心, 中国科学院饮用水科学与技术重点实验室, 北京 100085

• 安晓强
• 中国科学院生态环境研究中心, 中国科学院饮用水科学与技术重点实验室, 北京 100085

• 李一兵
• 河北工业大学土木工程学院, 天津 300401

• 李建斐
• 河北工业大学土木工程学院, 天津 300401

• 姜鹏
• 河北工业大学土木工程学院, 天津 300401

• 许文泽
• 河北工业大学土木工程学院, 天津 300401

• 兰华春
• 中国科学院生态环境研究中心, 中国科学院饮用水科学与技术重点实验室, 北京 100085

• 摘要：针对常规方法难以去除水中Br₃^-的问题，采用浸渍煅烧法制备了负载型纳米Pd/Al₂O₃粒子电极，研究了该电极电催化还原BrO₃^-的效果.催化剂的结构表征表明该反应实现了Pd纳米晶的均匀负载，纳米Pd/Al₂O₃具有较高的电催化活性和较低的能耗，其最佳反应条件为3% Pd负载量，0.9 mA·cm^-2电流密度和1 g·L催化剂投量，酸性条件可促进BrO₃^-的直接或间接还原.ESR检测证实了Pd的负载增强了反应体系活性物种[H]的生成，进而促进了BrO₃^-的间接电催化还原.

• Abstract：The conventional water treatment strategies face the challenge to remove harmful BrO₃^- from drinking water. Here, Pd/Al₂O₃ particle electrodes were synthesized via an impregnation and calcination method. The potential application of particle electrodes in the electrocatalytic reduction of BrO₃^- was studied. The structural characterization results of catalysts confirme the uniform distribution of Pd nanocrystals, which resulted in the superior catalytic efficiency and low energy consumption. The optimal conditions for the reduction was determined to be 3% Pd loading, 0.9 mA·cm^-2 current density and 1 g·L^-1 catalyst dosage. Both of direct and indirect reduction could be facilitated by decreasing solution pH. The reactive species and possible electrocatalytic mechanism were further investigated. The ESR spin trapping result demonstrates the enhanced production of atomic[H] in the presence of Pd, which contributed to the significantly improved electrocatalytic reduction of BrO₃^-.

• Key words：electrocatalytic reduction  particle electrodes  bromate  atomic hydrogen  nano-Pd/Al₂O₃

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