ZnO-PMMA复合材料光催化去除水中低浓度氨氮
发布时间：2018-01-04 02:38
本文关键词：ZnO-PMMA复合材料光催化去除水中低浓度氨氮 出处：《环境科学学报》2017年02期 论文类型：期刊论文
【摘要】：通过水热法制备纳米ZnO,采用热粘固法成功地将其负载于聚甲基丙烯酸甲酯(PMMA)微球表面,并对ZnO-PMMA复合材料光催化去除水中低浓度氨氮的能力进行了考察.同时,探究了负载比例、初始氨氮浓度、催化剂浓度和pH对低浓度氨氮去除效率的影响.实验结果显示,PMMA改善了纳米ZnO的分散性和光催化能力,ZnO-PMMA能够有效地催化去除氨氮废水.在汞灯照射下,当pH=12、温度为30℃时,1 g·L~(-1)的催化剂(ZnO-PMMA)对50 mg·L~(-1)的氨氮废水去除率达到66%,且反应产物硝氮和亚硝氮含量较低,体现了该催化剂具有将氨氮转化为N2的良好的光催化降解能力.同时,纳米材料可以简单方便地回收,减轻了对环境的潜在影响,符合绿色化学的原则.
[Abstract]:The preparation of nano ZnO by hydrothermal method, using thermal bonding method successfully loaded on the polymethyl methacrylate (PMMA) microspheres, and the ability to remove low concentration of ammonia water on ZnO-PMMA composite photocatalysts were investigated. At the same time, to explore the load ratio, initial ammonia nitrogen concentration, the effects of catalyst concentration and removal efficiency of pH low concentration of ammonia. The experimental results show that PMMA can improve the dispersion and photocatalytic ability of nano ZnO, ZnO-PMMA can effectively catalytic removal of ammonia wastewater. When the pH=12 in mercury lamp irradiation, and the temperature is 30 degrees centigrade, 1 g - L~ (-1) catalyst (ZnO-PMMA) to 50 mg (-1 - L~) the ammonia removal rate reached 66%, and the reaction product of nitrate nitrogen and nitrite nitrogen content is relatively low, reflecting the catalyst with the conversion of ammonia nitrogen is N2 good photocatalytic degradation ability. At the same time, nano materials can be simple and convenient recycling, reducing the ring The potential impact of the environment is in line with the principles of green chemistry.
【作者单位】： 南京理工大学化工学院;江苏省农业科学研究院农业资源与环境研究所;
【基金】：国家自然科学基金(No.41301267) 江苏省农业科技自主创新资金项目(No.CX(15)1004)~~
【分类号】：X703
【正文快照】： 2.江苏省农业科学研究院农业资源与环境研究所,南京2100141引言(Introduction)随着人类工业、生活污水的排放,加之农业面源污染,导致地表水氨氮污染严重.过量的氨氮会引起水体富营养化,使藻类大量增殖,对水体生态平衡和人类健康产生了严重的危害(姜瑞等,2013).因此,迫切需要寻，
本文编号：1376691
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