氯化银(银)-铜铁钛氧化物光催化材料制备及还原硝酸盐性能  

AgCl(Ag)/CuFe_(x)Ti_(x+1)O_(y) for photocatalytic reduction of nitrate

作　　者：季兴立 于水利[1,2] 许莹 高梦鸿 JI Xingli;YU Shuili;XU Ying;GAO Menghong(State Key Laboratory of Pollution Control and Resource Reuse,College of Environmental Science and Engineering,Tongji University,Shanghai,200092,China;Shanghai Institute of Pollution Control and Ecological Security,Shanghai,200092,China)

机构地区：[1]同济大学环境科学与工程学院污染控制与资源再利用国家重点实验室,上海200092 [2]上海污染控制与生态安全研究所,上海200092

出　　处：《环境化学》2024年第7期2373-2381,共9页Environmental Chemistry

基　　金：国家自然科学基金(52170011)资助.

摘　　要：本研究采用改性的溶剂热法和化学沉淀法制备氯化银(银)-铜铁钛氧化物(AgCl(Ag)/CuFe_(x)Ti_(x+1)O_(y))复合光催化材料,用于去除水中的硝酸盐.分析表明,AgCl(Ag)促进CuFe_(x)Ti_(x+1)O_(y)产生光生电子,并促进光生电子-空穴对的分离,从而提高复合材料光催化还原硝酸盐性能.研究重点探究了复合材料在紫外/甲酸体系中的光还原性能,并将其应用于实际水处理中.实验结果表明:当AgCl掺杂量为40%(按质量算),且铜铁钛的配比为1:2:3时,光催化还原硝酸盐的效果最佳.在150 min时,硝酸盐去除率达94.6%,去除速率为(0.0188±0.0017)min^(-1),氮气转化率达99.0%.在实际水处理中,该体系对自来水和模拟地下水的硝酸盐去除率分别为87.4%和80.9%,氮气转化率均大于70%,显示出良好的应用潜力.A photocatalyst AgCl(Ag)/CuFe_(x)Ti_(x+1)O_(y) were prepared by synthetic methods including solvothermal and chemical precipitation methods.The analysis revealed that the presence of AgCl(Ag)facilitated the generation of photogenerated electrons in CuFe_(x)Ti_(x+1)O_(y),while inhibiting the recombination of electrons and holes,consequently enhancing photocatalytic efficiency.This article took nitrate as the removal object and investigated the photoreduction capabilities of the composite materials in the UV/formic acid system as well as their potential application in realistic water.The experimental results indicated that the optimal outcome was achieved when the AgCl doping concentration was 40%by massand the ratio of copper,iron,and titanium was 1:2:3.After 150 minutes of reaction,the nitrate removal rate was 94.6%,the degradation rate reached(0.0188±0.0017)min^(-1),and the nitrogen conversion rate reached 99.0%.Additionally,in implementation in realistic water treatments,the system exhibited nitrate removal rates of 87.4%for tap water and 80.9%for simulated groundwater,with a nitrogen conversion rate exceeding 70%.These results suggesting a promising potential for application.

关 键 词：氯化银(银)-铜铁钛氧化物 高级还原 硝酸盐 氮气转化率 

分 类 号：X-1[环境科学与工程] O6[理学—化学]