木质纤维素/蒙脱土纳米复合材料对Hg(Ⅱ)的吸附性能-《西北林学院学报》

文章信息/Info

Title:: Adsorptionand Desorption Propertiesof Hg(Ⅱ)on Lignocellulose/Montmorillonite Nanocomposite

作者:: 多化琼¹; 谢孔辉^1*; 张晓涛²; （1.内蒙古农业大学材料科学与艺术设计学院，内蒙古呼和浩特 010018；2.内蒙古农业大学理学院，内蒙古呼和浩特 010018）

Author(s):: DUO Hua-qiong¹; XIE Kong-hui^1*; ZHANG Xiao-tao²; (1.College of Material Science and Art Design,Inner Mongolia Agriculture University,Huhhot,Inner Mongolia 010018,China; 2.College of Science,Inner Mongolia Agriculture University,Huhhot,Inner Mongolia 010018,China)

Keywords:: lignocellulose; nanometer montmorillonite; Hg(Ⅱ); adsorption; desorption; waste water

摘要:: 以木质纤维素和蒙脱土为原材料,采用插层复合方式制备木质纤维素/蒙脱土纳米复合材料(LNC/MMT)吸附剂,研究其对Hg(Ⅱ)离子的吸附和解吸性能。结果表明：该吸附剂对Hg(Ⅱ)有较好的吸附能力,在Hg(Ⅱ)溶液初始浓度为 0.8 mmol·L^-1,吸附时间为120 min，吸附温度为50 ℃，pH值为4时，吸附量达到最大79.32 mg·g^-1;在研究的浓度范围内，吸附过程符合伪二级动力学模型，吸附平衡符合Langmuir模型。采用0.3 mol·L^-1的HNO₃作为解吸剂,在解吸时间为30 min、解吸温度为30 ℃时解吸量达到最大66 mg·g^-1。循环再生试验证明所制备吸附剂的重复使用性能良好。进一步结合SEM、EDX和FTIR分析了该吸附剂对Hg(Ⅱ)的吸附和解吸的机理。

Abstract:: Lignocellulose (LNC) and montmorillonite (MMT) were used to prepare nanocomposite by intercalation compounding method.The adsorption and desorption abilities of the prepared nanocomposite were examined.The maximum adsorption amount (79.32 mg·g^-1) was achieved under the conditions of the initial Hg (Ⅱ) concentration:0.8 mmol·L^-1,adsorption time:120 min,adsorption temperature:50 ℃,and pH:4.The adsorption process conformed to the pseudo-second-order kinetics model and the adsorption equilibrium was in line with the Langmuir adsorption model.The maximum desorption amount (66.00 mg·g^-1) was achieved under the conditions of desorption agent:0.3 mol·L^-1 HNO₃,desorption time:30 min,and desorption temperature:30℃.In the recycling experiment,the LNC/MMT nanocomposite demonstrated good performances of repeated use.The mechanisms of adsorption and desorption were analysed in combined with SEM,EDX and FTIR.