化工进展Issue(7)：2080-2085,2096,7.DOI:10.16085/j.issn.1000-6613.2015.07.046
改性 Fe3O4纳米粒子的定性及对功能菌固定化与脱氮特性
Characteristics of modified Fe3O4 nanoparticles and application for immobilization of functioning bacterium and denitrification in water
摘要
Abstract
In order to solve the water pollution caused by eutrophication,Fe3O4 nanoparticles modified with SiO2 and chitosan(CS)was used for immobilizing functional strain,so that the strain can denitrify the contamination in water more efficiently. The morphology,structure and magnetic properties of Fe3O4 nanoparticles were characterized by scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),thermogravimetric analysis(TGA)and vibrating sample magnetometer(VSM),and the functions for removing ammonia nitrogen and nitrate nitrogen from water were investigated. The results showed that Fe3O4 nanoparticles exhibited highly ordered crystallinity,regular crystalline morphologies and excellent magnetism. The adsorption rate for the bacteria was up to 85.00% and the numbers of adsorption strain achieved (2.1—2.2)×106cfu/mL at 20min during the adsorption process. Furthermore,when the non-immobilized strain was added into the media(liquid),the removal rate of ammonia nitrogen and nitrate nitrogen was 54.13% and 59.17%,respectively. However,when the immobilized strain was added into the media,the removal rate of ammonia nitrogen and nitrate nitrogen increase to 72.26% and 74.56%. Experimental results showed that the modified Fe3O4 nanoparticles had strong adsorption capacity for the strain. In the mean time,the microcapsule structure could make the immobilized strain have better performance and longer life cycle of Fe3O4 nanoparticles compared with the non-immobilized strain.关键词
磁性微球/微胶囊/表征/脱氮性能Key words
magnetic microspheres/microcapsules/representation/denitrification performance引用本文复制引用
郑永杰,尚明慧,田景芝,王志刚,徐伟慧..改性 Fe3O4纳米粒子的定性及对功能菌固定化与脱氮特性[J].化工进展,2015,(7):2080-2085,2096,7.基金项目
“十二五”国家科技支撑计划项目（2013BAJ12B01）。 （）
