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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0.03mol·L-1,pH值4.9,吸附温度50℃,吸附时间60min时,吸附容量达到最大值322.56mg·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0.1mol·L-1的HNO3作为解吸剂,解吸温度40℃,超声波解吸时间30min时最大解吸量可达到283.15mg·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。
The LNC / nano-MMT composites prepared by intercalation of LNC and nano-MMT were used as adsorbents to simulate the adsorption and desorption experiments of Cu (II) in wastewater containing copper . The effects of initial concentration, pH value, adsorption temperature and adsorption time of Cu (II) solution on Cu (II) adsorption in solution were studied by static adsorption experiments. The results showed that the optimum adsorption conditions were as follows: initial concentration of Cu (II) solution was 0.03mol·L-1, pH value was 4.9, adsorption temperature was 50 ℃, adsorption time was 60min, adsorption capacity reached the maximum of 322.56mg · g-1. The quasi-second-order kinetic model can well describe the adsorption process, and the adsorption isotherm conforms to the Langmuir model. LNC / nanoMMT composites were desorbed and regenerated using HNO3. The results showed that the maximum desorption amount was 283.15 mg · g-1 when the desorption temperature was 40 ℃ with 0.1 mol·L-1 HNO3 as desorbent and the desorption time was 30 min. The adsorption mechanism of LNC / nano-MMT composite was analyzed by XRD, SEM and FTIR. Adsorption / desorption cycle experiments show that: LNC / nano-MMT composite material is still a high amount of adsorption when it is reused for 4 times, which is an excellent recyclable and efficient adsorbent.