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广西师范大学学报(自然科学版) ›› 2023, Vol. 41 ›› Issue (5): 105-115.doi: 10.16088/j.issn.1001-6600.2022110901
王威1,2, 邓华1,2*, 胡乐宁1,2, 李杨3
WANG Wei1,2, DENG Hua1,2*, HU Lening1,2, LI Yang3
摘要: 以赤泥和海藻酸钠为原料,采用交联反应的方法制备赤泥-海藻酸钠水凝胶(RMSA)。通过批量实验考察溶液初始pH、吸附温度、吸附时间、初始浓度以及多元重金属体系对RMSA吸附Pb(Ⅱ)效果的影响,并结合XRD、FTIR和SEM-EDS表征分析,研究其对Pb(Ⅱ)的吸附特性。实验结果表明,拟二级动力学吸附模型和Langmuir吸附等温模型能够更好地描述RMSA对Pb(Ⅱ)的吸附过程,该吸附过程属于单分子层化学吸附。在pH=6,温度为25 ℃,吸附时间为900 min,Pb(Ⅱ)初始浓度为30~900 mg/L的最佳条件下,RMSA对Pb(Ⅱ)的最大理论吸附量为454.54 mg/g。RMSA在多元重金属体系吸附实验中对Pb(Ⅱ)的吸附更具选择性。分析表明,离子交换是RMSA吸附Pb(Ⅱ)的主要机理。此外,RMSA经过5次循环实验仍能保持较高的吸附性能,在经济适用性方面具有较好的应用前景。
中图分类号: X53
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