Adsorption-Coagulation Mechanism of Composites in Treating Acid Mine Drainage

Liping Xiao, Zhe Liu, Xuefei Luan, Jichi Bai
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Abstract

In order to study the removal efficiency of Cu 2+ from acid mine drainage by prepared bentonite - steel slag composite particle s, adsorption experiment was carried out. The composite particles were characterized by X-ray Diffraction analysis technique (XRD), Scanning Electron Microscopy (SEM) and Fourier Transform Infrared spectrometer (FTIR). The results show that: the composite particles can release alkali to neutralize the acid of acid mine drainage ; t he adsorption and chemical precipitation of Cu 2+ occur red in the whole reaction process ; t he removal amount of composite particles on Cu 2+ was 9.88 mg/g when the reaction reached equilibrium ; the FTIR spectra reveal ed the existence of surface complexation ; the SEM micrographs suggest ed that the composite particles would continue to adsorb and coagulate Cu 2+ after the composite particles surface adsorbing Cu 2+ and forming precipitate, namely, there was synergistic reaction of adsorption and coagulation ; the XRD patterns further showed the existence of cation exchange and revealed that the states of Cu 2+ in the surface of the composite particles was Cu -Si-O mineral phase and CuO(Cu(OH) 2 ) polymerization precipitation. The bentonite-steel slag composite particles which can play a role of adsorption-coagulation synergism are excellent multifunctional g reen environmental mineral materials to treat acid mine drainage containing heavy metal ions.
复合材料处理矿山酸性水的吸附-混凝机理研究
为了研究制备的膨润土-钢渣复合颗粒对酸性矿山废水中Cu 2+的去除效果,进行了吸附实验。采用x射线衍射分析技术(XRD)、扫描电镜(SEM)和傅里叶变换红外光谱仪(FTIR)对复合颗粒进行了表征。结果表明:复合颗粒能释放碱,中和酸性矿井水中的酸;Cu 2+的吸附和化学沉淀贯穿于整个反应过程;反应达到平衡时,复合颗粒对cu2 +的去除率为9.88 mg/g;FTIR光谱显示了表面络合的存在;SEM显微图表明,复合颗粒表面吸附cu2 +并形成沉淀后,仍会继续吸附和凝固cu2 +,即存在吸附和凝固的协同反应;XRD谱图进一步表明了阳离子交换的存在,表明复合颗粒表面的cu2 +形态为Cu -Si-O矿物相和CuO(Cu(OH) 2)聚合沉淀。膨润土-钢渣复合颗粒具有吸附-混凝协同作用,是处理含重金属酸性矿山废水的优良多功能绿色环保矿物材料。
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