包覆型纳米零价铁的制备及其对染料溶液的脱色性能  

Preparation of SiO_2-coated NZVI and its decolorization ability to dye solution

作　　者：张昊[1] 何如宝 崔岱宗[1] 吴聪荣 赵敏[1] Zhang Hao He Rubao Cui Daizong Wu Congrong Zhao Min(College of Life Science, Northeast Forestry University, Heilongjiang Harbinl50040, Chin)

机构地区：[1]东北林业大学生命科学学院,黑龙江哈尔滨150040

出　　处：《化工环保》2016年第6期625-629,共5页Environmental Protection of Chemical Industry

基　　金：国家自然科学基金资助项目(No.J1210053);中央高校基本科研业务费资助项目(No.2572015BA04)

摘　　要：采用一步法合成了SiO2覆型纳米零价铁（SiO2-NZVI），并采用TEM，XRD，FTIR及EDS方对其进行了表征，考察了SiO2-NZVI对偶氮、蒽醌、三苯甲烷3种不同类型的染料溶液的脱色能力。表征结果表明：SiO2-NZVI平均粒径为15-22nm，SiO，薄膜厚度均一，约为10nm；SiO2-NZVI中所含元素主要为Fe和Si，质量比为90．6：9．4。实验结果表明：SiO2-NZVI对3种染料溶液均具有脱色能力，在染料溶液质量浓度为100mg／L、SiO2-NZVI加入量为2g／L、反应时间为35min的条件下，对甲基橙、孔雀石绿、洋红溶液的脱色率分别为86．04％，97．50％，82．13％；SiO2-NZVI相对于NZVI有更强的抗氧化能力，且酸性环境有利于SiO2-NZVI对染料溶液的脱色。SiO2-coated nano-scale zero-valent iron （SiO2-NZVI）was synthesized by one-step method and characterized by TEM, XRD, FTIR and EDS. The decolorization abilities of SiO2-NZVI to 3 different sorts of dye solutions including azo dye, anthraquinone dye and triphenylmethane dye were investigated. The characterization results show that： The average grain diameter of SiO2-NZVI is 15-22 nm, and the thickness of the uniform SiO2 film is approximately 10 nm; The main elements in SiO2-coated NZVI are Fe and Si, with the mass ratio of 90.6 ： 9.4. The experimental results show that： SiO2-NZVI has decolorization ability to each of the 3 dye solution, and under the conditions of mass concentration of dye solution 100 mg/L, SiO2-NZVI dosage 2 g/L and reaction time 35 min, the decolorizaition rate of the dye solution containing methyl orange, malachite green and magenta is 86.04%, 97.50%, 82.13% respectively; SiO2-NZVI is more resistant to oxidation than NZVI and acidic environment is beneficial for decolorizaition.

关 键 词：纳米零价铁 二氧化硅 包覆 染料 脱色 

分 类 号：X788[环境科学与工程—环境工程]