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化工进展  2015 

纳米腐殖酸对重金属铬的吸附热力学及动力学

DOI: 10.16085/j.issn.1000-6613.2015.06.046, PP. 1792-1798

Keywords: 纳米腐殖酸,铬离子,热力学,动力学,吸附,重复使用性

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Abstract:

采用静态吸附法系统研究了纳米腐殖酸对重金属铬的吸附,考察了吸附剂用量、吸附温度、振荡时间、溶液pH值等因素对纳米腐殖酸吸附含铬废水的影响;用N2吸附-脱附实验表征吸附剂的比表面积及孔径;绘制了静态吸附等温线及吸附动力学曲线。实验结果表明最优吸附条件为纳米腐殖酸加入量50g/L,吸附温度30℃,振荡时间20min,溶液pH=5.0,得到吸附率及吸附量分别为97.5%和157.52mg/g;其比表面积及平均孔径分别为150.6m2/g和6.5nm;纳米腐殖酸对铬离子的吸附符合Langmuir模型,为单分子层吸附,吸附过程是自发且放热过程;吸附过程动力学符合准一级动力学方程;连续循环使用4次后,对铬离子的吸附量无明显改变,表明吸附剂具有重复使用性。

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