Flash fixation of heavy metals from two industrial wastes into ferrite by microwave hydrothermal co-treatment.
Flash fixation of heavy metals from two industrial wastes into ferrite by microwave hydrothermal co-treatment.
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DOI：
10.1016/j.jhazmat.2011.06.091
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发表时间：
2011-09
影响因子：
13.6
通讯作者：
Dan Chen;Chun-Yan Mei;Li-Hua Yao;Hong-Ming Jin;G. Qian;Zhiyuan Xu
中科院分区：
文献类型：
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作者：
Dan Chen;Chun-Yan Mei;Li-Hua Yao;Hong-Ming Jin;G. Qian;Zhiyuan Xu
采用微波水热法对电镀废水和酸洗废液中的重金属进行快速固定。电镀废水中的Cr（VI）与酸洗废液中的Fe（II）发生氧化还原反应，可降低废水的毒性。通过Box-Behnken设计（BBD）实验，确定了最佳工艺条件为：废水体积比（VPWL：VEPW = 0.20）、pH值11、停留时间15min。在此条件下，生成的铁氧体具有较高的饱和磁化强度（Ms），为47.4emu/g。根据晶粒生长动力学，快速铁素体过程具有较低的激活能7.01kJ/mol。从环境和经济角度出发，我们介绍了一种新的、有趣的水修复方法，即利用微波介导的水热过程同时合成铁氧体。
Flash fixation of heavy metals from electroplating wastewater (EPW) and pickling waste liquor (PWL) into ferrite lattice can be investigated by microwave hydrothermal process. The toxicity of wastewater may be reduced by the redox reaction between Cr(VI) in electroplating wastewater and Fe(II) in pickling waste liquor. Box–Behnken design (BBD) experiment gives optimal process condition of ferrite formation as follows: wastewater volume ratio (VPWL:VEPW=0.20), pH value 11 and retention time 15min, on which formed ferrite has a soft magnetic property with high saturation magnetization (Ms) 47.4emu/g. The rapid ferrite process has lower activation energy 7.01kJ/mol according to grain growth kinetics. Concerning the environmental and economy, we introduced a new and interesting method for water remediation simultaneously synthesizing ferrite by using microwave mediated hydrothermal processes.