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几种合成铁锰铝氧化物对铜离子的吸附作用及其影响因素研究

Keywords: 针铁矿,赤铁矿,δ-MnO2,三羟铝石,,吸附,影响因素

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Abstract:

应用平衡吸附法,研究了在不同的pH、离子强度、温度、Cu2+浓度及接触时间条件下,针铁矿、赤铁矿、δ-MnO2和三羟铝石对Cu2+的吸附作用。结果表明,随pH升高,几种氧化物对Cu2+的吸附率增大;针铁矿、赤铁矿和三羟铝石对Cu2+的吸附边界pH分别为4、5和4,而δ-MnO2的吸附边界pH不明显;随离子强度增大,针铁矿和赤铁矿对Cu2+的吸附量增加,而δ-MnO2和三羟铝石则降低;随Cu2+浓度增加,几种氧化物对Cu2+的吸附量增加,Langmuir方程的拟合效果最好。表观热力学参数指出,几种氧化物对Cu2+的吸附是自发、吸热和混乱度增加的过程;几种氧化物对Cu2+的吸附动力学过程可划分为快速和慢速反应阶段,Elovich方程更适于描述针铁矿和δ-MnO2对Cu2+的吸附动力学过程,双常数和抛物线扩散方程更适于赤铁矿,而一级动力学方程更适于三羟铝石。活化能和活化热力学参数指出,δ-MnO2对Cu2+吸附所需能量少、容易达到有序态,吸附速率大;而赤铁矿对Cu2+吸附所需能量多、不易达到有序态,吸附速率小。几种氧化物对Cu2+吸附的强弱顺序通常为δ-MnO2>三羟铝石>针铁矿>赤铁矿。

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