摘要
采用浸渍法制备催化剂Pd-Cu/γ-Al2O3,用BET、ICP、XRD、TEM和EDX对该催化剂进行了表征.以甲酸钠作为还原剂,对催化还原硝酸盐进行了试验研究.结果表明,100mg·L-1硝酸盐完全反应时总氮的脱除率可以达到87%.催化反应的活性和选择性受pH值、催化剂投加量、甲酸钠浓度和硝酸盐初始浓度等反应条件影响.甲酸钠作为还原剂时只需控制溶液初始pH值,初始pH值过高或过低都会降低催化剂活性;控制初始pH值为4.5,适当降低催化剂投加量和增加甲酸钠的浓度有利于提高催化活性,但选择性会显著降低.初始pH值为4.5时,不同初始浓度硝酸盐的催化还原反应为一级反应.
catalyst Pd-Cu /γ-Al2O3 was prepared by impregnation and characterized by BET,ICP,XRD, TEM and EDX. Catalytic reduction of nitrate in groundwater by sodium formate was conducted. It was found that total nitrogen was removed effectively from the 100 mg · L^-1 nitrate solution with a removal rate of 87%. It was also found that the catalytic activity was affected by pH value, catalyst amount, concentration of sodium formate and initial concentration of nitrate. Using sodium formate as a reductant, it was only needed to control initial pH value. Too high or too low initial pH value reduced the catalytic activity. An initial pH value of 4.5, a low amount of catalyst amount and high concentration of sodium formate were in favor of the catalytic reduction of nitrate, but decreased the selectivity. When initial pH value of 4.5 and at different initial concentration of nitrate, the catalytic reduction followed a first order kinetics.
出处
《环境科学学报》
CAS
CSCD
北大核心
2006年第4期567-571,共5页
Acta Scientiae Circumstantiae
基金
教育部南开大学
天津大学科技合作基金项目~~
关键词
催化还原
硝酸盐
氨氮
催化剂
甲酸钠
catalytic reduction
nitrate
ammonium
catalysis
sodium formate
