摘要:
印染工业生产中大量染料废水排放进入环境,对水生生物及人类健康造成威胁。为减少染料废水污染,本研究制备了一种MnFe 2 O 4@硅藻土复合材料吸附剂(MnFe 2O4@ DE),对废水中孔雀石绿(MG)染料具有优良去除效果且制备方法简单。通过多种方法对复合材料结构特性进行分析,研究了其对 MG 的吸附效果。试验结果表明,MnFe 2O4@DE中纳米铁锰颗粒均匀分布在硅藻土表面,其比表面积(112. 1m2 /g)及孔体积(0. 24cm3 /g)较两种单体材料明显增大。MnFe2O4@DE 对MG有较好去除效果,它对MG的最大吸附量为25. 70mg/ g,分别是硅藻土和MnFe2O4的1. 89 倍和1. 13 倍。MnFe 2O4@DE对MG的吸附过程是自发、吸热的,符合伪二级动力学和Langmuir 模型,且具有很好的再生性能,再生使用4次后仍具有87. 56%的去除率。可见,MnFe2O4@DE在染料污染治理领域具有较好的应用潜力。
Abstract:
Massive discharge of dyes by industries into environment has posed a threat to aquatic organisms and human health. In order to reduce dye pollution,a MnFe 2 O4 @ diatomite composite adsorbent (MnFe 2O4 @ DE)with excellent removal effect of malachite green(MG)in wastewater and simple preparation method was prepared in this study. A variety of characterization methods were used to analyze structural properties of the composite and its adsorption effect on MG was also systematically studied. The results showed that the MnFe 2O4 nanoparticles were well distributed on the surface of diatomite. Compared to two monomer materials,the specific surface area(112. 1m2/g)and pore volume(0. 24cm3/g)of the composite increased significantly. The as-synthesized composite exhibited enhanced ad- sorption behavior to MG,and its maximum adsorption capacity could reach 25. 70mg/g,which was up to around 1. 89 and 1. 13 times as much as that of diatomite(DE)and MnFe 2O4respectively. The adsorption process was spontaneous and endothermic,which was consistent with pseudo-second-order kinetic model and Langmuir model. And MnFe 2O4 @ DE also showed good reusability. After 4 times of reuse,composite still had 87. 56% removal effect on MG. Therefore,MnFe 2O4 @ DE has good application potential in dye pollution control.
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