摘要
以金属表面处理的副产物磷化渣为原料,采用水热法在不同温度下制备了羟基磷酸铁。通过对样品的成分、形貌、结构进行表征分析,探讨了铅离子在改性羟基磷酸铁修饰电极上的电化学性能。结果表明:在180℃制备的羟基磷酸铁晶型结构较好,呈正八面体,粒径比较均匀,约为13~16μm;在氮气下热处理改性的羟基磷酸铁P_2表面有碳氮沉积。电化学分析表明,在空气下热处理改性的羟基磷酸铁催化剂P_1以及催化剂P_2均具有明显的催化活性,其中,P_2催化剂修饰电极的峰电位差仅为265 mV,同时峰电流显著增大,表现出优于P_1催化剂的电催化性能。这主要归因于P_2催化剂表面具有提高催化活性以及增大电极表面电子传递速率的石墨碳和氮。
Hydroxyl iron phosphate was hydrothermally prepared from phosphate sludge,a by-product of metal surface treatment at different temperatures,and the elemental,structural,and surface morphologies of the samples were characterized.The electrochemical performance of electrode modified with hydroxyl iron phosphate for lead ion were also investigated.Characterization analysis showed that the hydroxyl iron phosphate prepared at 180℃ had better crystal structure with octahedrons and uniform particle size approximately from 13 to 16 μm.Graphite carbon and nitrogen were deposited on the surface of the hydroxyl iron phosphate modified by heat treatment under a nitrogen atmosphere.Electrochemical analysis showed that the P_1 and P_2 catalysts that were modified by heat treatment under an air atmosphere and a nitrogen atmosphere,respectively,exhibited good catalytic activity.Compared with P_1,P_2 had a smaller peak potential difference of 265 mV,a larger peak current,and exhibited better electrochemical performance because of the graphite carbon and nitrogen on its surface,which enhanced the catalytic activity and increased the electron transfer rate at the electrode surface.
出处
《环境工程学报》
CAS
CSCD
北大核心
2017年第5期3135-3141,共7页
Chinese Journal of Environmental Engineering
基金
浦东新区科技发展基金创新资金(PKJ2014-Z03)
上海第二工业大学材料科学与工程重点学科(XXKZD1601)
上海第二工业大学研究生项目基金(A01GY16F030)
上海市曙光计划(09SG54)
关键词
磷化渣
羟基磷酸铁
铅离子
电催化性能
phosphate sludge
hydroxyl iron phosphate
lead ion
electrocatalytic performance
