摘要
用30%(w)H_2O_2溶液氧化处理活性炭(AC),再以三聚氰胺为含氮前驱体经高温处理制得氮掺杂AC催化剂。采用催化湿式氧化(CWO)法去除草甘膦废水中的有机磷(OP),将其彻底氧化降解为PO_4^(3-),再利用Ca(OH)_2沉淀法去除总磷(TP)。表征结果显示:氮掺杂改性可在AC表面形成多种含氮碱性官能团,从而提高其对OP的催化氧化活性。实验结果表明:在温和的工艺条件下(130℃,1 MPa),该催化剂对不同来源废水的OP去除率均高于90%;当m(Ca(OH)_2)∶m(TP)为20时,Ca(OH)_2沉淀可有效去除CWO出水中的TP,最终出水TP质量浓度小于5 mg/L,可有效缓解后续生化系统除磷的压力。
The nitrogen-doped activated carbon（AC）catalyst was prepared by oxidation treatment with 30%（w）H2 O2 solution and thermal treatment with melamine as nitrogen-containing precursor. Organic phosphorus（OP）in glyphosate wastewater was removed and degraded deeply into PO4-（3-）by catalytic wet oxidation（CWO）with nitrogen-doped AC,and then the total phosphorus（TP）could be removed by Ca（OH）2 precipitation. The characterization results indicated that a variety of nitrogen-containing basic groups was formed on the surface of AC by nitrogen doping,which enhanced its catalytic activity to OP oxidation. The experimental results showed that：At the mild conditions（130 ℃,1 MPa）,all the removal rates of OP in different wastewaters were above 90%with the catalyst;When m（Ca（OH）2）∶m（TP）was 20,TP in the CWO effluent could be removed effectively by Ca（OH）2 precipitation with lower than 5 mg/L of the effluent TP mass concentration,which relieved the pressure of biological treatment system for phosphorus removal.
作者
邢波
杨郭
陈洪林
刘兴勇
张小明
XING Bo1,YANG Guo1,CHEN Honglin2,LIU Xingyong1,ZHANG Xiaoming2(1. College of Chemical Engineering,Sichuan University of Science and Engineering,Zigong Sichuan 643000,China;2. Chengdu Institute of Organic Chemistry,Chinese Academy of Sciences,Chengdu Sichuan 610041,Chin)
出处
《化工环保》
CAS
CSCD
北大核心
2018年第3期311-316,共6页
Environmental Protection of Chemical Industry
基金
四川省科技支撑计划项目(2015GZ0169)
关键词
氮掺杂活性炭
湿式催化氧化
草甘膦
总磷
nitrogen-doped activated carbon
catalytic wet oxidation
glyphosate
total phosphorus
