采用木质纤维素(LNC)与纳米蒙脱土(nano-MMT)插层复合制备出的LNC/nano-MMT复合材料作为吸附剂,进行了模拟含铜废水中Cu (Ⅱ)的吸附和解吸实验.通过静态吸附实验,研究了含Cu (Ⅱ)溶液的初始浓度、pH值、吸附温度和吸附时间对溶液中Cu (Ⅱ)吸附效果的影响.结果表明:最佳的吸附条件是Cu (Ⅱ)溶液初始浓度0.03 mol·L-1,pH值4.9,吸附温度50℃,吸附时间60 min时,吸附容量达到最大值322.56 mg·g-1.准二级动力学模型能很好地描述其吸附过程,吸附等温线符合Langmuir模型.使用HNO3对LNC/nanoMMT复合材料进行解吸再生实验.结果表明:以0.1 mol·L-1的HNO3作为解吸剂,解吸温度40℃,超声波解吸时间30 min时最大解吸量可达到283.15 mg·g-1.结合XRD、SEM和FTIR分析LNC/nano-MMT复合材料的吸附机制.吸附/解吸循环实验研究表明:LNC/nano-MMT复合材料重复使用4次时吸附量仍较高,是一种优良的可循环利用的高效吸附剂.
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