Efficient removal of dyes by a novel magnetic Fe3O4/ZnCr-layered double hydroxide adsorbent from heavy metal wastewater
Efficient removal of dyes by a novel magnetic Fe3O4/ZnCr-layered double hydroxide adsorbent from heavy metal wastewater
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新型磁性 Fe3O4/ZnCr 层状双氢氧化物吸附剂高效去除重金属废水中的染料
DOI：
10.1016/j.jhazmat.2012.10.014
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发表时间：
2012-12-01
影响因子：
13.6
通讯作者：
Qian, Guangren
中科院分区：
文献类型：
--
作者：
Chen, Dan;Li, Yang;Qian, Guangren
以电镀废水和酸洗废液为原料，采用两步微波水热法制备了一种新型磁性Fe 3 O 4/ZnCr层状双氢氧化物吸附剂。研究了该材料对水中甲基橙子的吸附性能。三个变量的影响进行了研究，通过单因素的方法。采用Box-Behnken设计的响应面法对制备条件进行了优化。MO的最大吸附量为240.16 mg/g，表明该材料是一种有效的吸附剂。结果表明，99%的重金属离子（Fe 2+，Fe 3+，Cr 3+，Zn 2+）可以有效地去除到沉淀物中，并在吸附过程中释放得很少。此外，这种吸附染料的材料可以很容易地通过磁场分离，并在高级氧化技术催化再生后回收。同时，动力学模型，FTIR光谱和X-射线衍射图案被应用到实验数据，以探讨摄取机制。边界层和颗粒内扩散在吸附机理中起重要作用。(C)出版社：Elsevier B. V.
A novel magnetic Fe3O4/ZnCr-layered double hydroxide adsorbent was produced from electroplating wastewater and pickling waste liquor via a two-step microwave hydrothermal method. Adsorption of methyl orange (MO) from water was studied using this material. The effects of three variables have been investigated by a single-factor method. The response surface methodology (RSM) based on Box-Behnken design was successfully applied to the optimization of the preparation conditions. The maximum adsorption capacity of MO was found to be 240.16 mg/g, indicating that this material may be an effective adsorbent. It was shown that 99% of heavy metal ions (Fe2+, Fe3+, Cr3+, and Zn2+) can be effectively removed into precipitates and released far less in the adsorption process. In addition, this material with adsorbed dye can be easily separated by a magnetic field and recycled after catalytic regeneration with advanced oxidation technology. Meanwhile, kinetic models, FTIR spectra and X-ray diffraction pattern were applied to the experimental data to examine uptake mechanism. The boundary layer and intra-particle diffusion played important roles in the adsorption mechanisms. (C) 2012 Published by Elsevier B.V.