目前有关纯聚吡咯(PPy)用于吸附处理含Cr(Ⅵ)废水的研究不多.为了考察聚吡咯对铬离子污水的吸附性能,在超声条件下原位氧化聚合制备了PPy微／纳米球.用红外光谱仪、X射线衍射仪、扫描电子显微镜、透射电子显微镜和紫外-可见光谱仪分别表征了样品的结构、形貌和吸附性能.以聚吡咯为吸附剂研究了吸附时间、pH值、初始浓度及温度对Cr(Ⅵ)离子吸附性能的影响.结果表明:对于含Cr(Ⅵ) 500 mg/L的溶液,吸附5 min的去除率已超过94.6％;pH值对PPy吸附性能影响不大;随着温度的升高,吸附率逐渐升高.其等温吸附行为较好地符合Freudlich吸附模型.PPy动力学吸附拟合满足准二级动力学模型,通过计算得到聚吡咯对Cr(Ⅵ)的理论最大单位吸附量为47.6 mg/g(试验值为49.7 mg/g).
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