ZnFe2O4/NG光催化同时脱除亚硝态氮与氮氨的研究  

Photocatalytic simultaneous removal of nitrite and ammonia via zinc ferrite/N-doped graphene catalyst

作　　者：叶嘉 刘守清 YE Jia;LIU Shouqing(School of Chemistry,Biology and Materials Engineering,SUST,Suzhou 215009,China;Jiangsu Key Laboratory of Environmental Functional Materials,Suzhou 215009,China)

机构地区：[1]苏州科技大学化学生物与材料工程学院,江苏苏州215009 [2]江苏省环境功能材料重点实验室,江苏苏州215009

出　　处：《苏州科技大学学报（自然科学版）》2019年第4期36-42,共7页Journal of Suzhou University of Science and Technology（Natural Science Edition）

基　　金：国家自然科学基金资助项目(21576175);江苏省产业前瞻项目(BE2015190);苏州科技大学研究生创新项目(SKCX16_066)

摘　　要：采用水热法合成氮杂石墨烯负载的铁酸锌(ZnFe2O4/NG)杂化催化剂,并利用X射线粉末衍射、透射电子显微镜、拉曼光谱以及紫外-可见漫反射光谱等方法对催化剂进行了表征。以ZnFe2O4/NG为光催化剂开展了同时脱除亚硝态氮与氨氮的研究,考察了pH值、催化剂用量、氮杂石墨烯含量、氨氮初始浓度等对光催化脱除亚硝态氮与氨氮的影响。结果表明,在厌氧条件下,pH=9.5的亚硝态氮与氨氮混合溶液中,当ZnFe2O4/NG(NG 5.0 wt%)用量为1.5 g·L^-1,亚硝态氮与氨氮初始浓度分别为50 mg·L^-1和100 mg·L^-1时,白光光照3 h,亚硝态氮与氨氮的脱氮率分别达到90.95%和62.84%。随后将溶液曝气30 min,继续光照10 h后,亚硝态氮、氨氮和总氮的脱氮率分别达到92.04%、89.44%和90.31%。实现了光催化同时脱除亚硝态氮与氨氮的目标。Zinc ferrite/N-doped graphene catalysts were synthesized by hydrothermal reaction. The synthesized materials were characterized by XRD,TEM,Raman and UV-VIS-DRS. We explored the photocatalytic simultaneous removal of nitrite and ammonia via zinc ferrite/N-doped graphene as the photocatalyst. The effects of pH,amount of catalyst,N-doped graphene content,and initial concentration of ammonia on photocatalytic removal of nitrite and ammonia were examined. The results show that the removal ratio of nitrite-N and ammonia-N is90.95% and 62.84% respectively,when the dosage of ZnFe2O4/NG(NG 5.0 wt%) is 1.5 g·L^-1 and the initial concentrations of nitrite-N 50 mg·L^-1,ammonia-N 100 mg·L^-1 with pH 9.5 under anaerobic conditions upon white light irradiation for 3 h. After the solution is aerated for 30 min and irradiated for 10 h under aerobic conditions,the removal ratios of nitrite-N,ammonia-N and total nitrogen are 92.04%,89.44% and 90.31% respectively. The complete removal of nigrogen is done.

关 键 词：铁酸锌/氮杂石墨烯 亚硝态氮 氨氮 光催化 同时脱除 

分 类 号：X592[环境科学与工程—环境工程]