Adsorption of Heavy Metal Ions from Leachate by Chitosan Cross-linked Humic Acid Gel Beads
LIU Shan1,2,*, LIAO Lei1,2, WEI Li1,3, LI Xuanni1,2, CAO Lei1,2, WANG Xin1,2
1 School of Water and Environment,Chang'an University, Xi'an 710054, China 2 Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang'an University, Xi'an 710054, China 3 Fourth Institute of Geological and Mineral Exploration of Gansu Provincial Bureau of Geology and Mineral Resources, Jiuquan 735000, Gansu, China
Abstract: Anovel porous composite adsorbent(CS-HA gel beads) was prepared by chitosan (CS) modified with humic acid(HA), using formaldehyde (CH2O) as the crosslinking agent and polyethylene glycol (PEG) as the pore-forming agent. The static adsorption performance of Cr(Ⅵ), Ni(Ⅱ), Cu(Ⅱ) and Pb(Ⅱ) by CS-HA gel beads and the dynamic adsorption capacity of the four heavy metal ions in the leachate environment were investigated. The results showed that the optimal adsorption pH of Cr(Ⅵ), Ni(Ⅱ), Cu(Ⅱ) and Pb(Ⅱ) were 3, 8, 6 and 6, respectively. The adsorption process of the four heavy metal ions conformed to the pseudo-second-order kinetics and Langmuir isothermal model, with the adsorption being spontaneous.The maximum adsorption capacity of Cr(Ⅵ), Ni(Ⅱ), Cu(Ⅱ) and Pb(Ⅱ) was 108.84 mg/g, 170.40 mg/g, 104.95 mg/g and 92.80 mg/g, respectively. The dynamic adsorption experiment results showed that CS-HA gel beads could simultaneously adsorb Cr(Ⅵ), Ni(Ⅱ), Cu(Ⅱ) and Pb(Ⅱ) from the leachate, and the adsorption capacity of the four heavy ions was similar. The depletion time of Ni(Ⅱ) was the longest, and the utilization efficiency of the adsorbent was the highest. The FTIR results indicated that the complexation of hydroxyl, amino and carboxyl groups with heavy metal ions was the main adsorption mechanism.
刘珊, 廖磊, 魏莉, 李炫妮, 曹磊, 王鑫. 壳聚糖交联腐殖酸凝胶球吸附渗滤液中重金属离子研究[J]. 材料导报, 2023, 37(3): 21040317-8.
LIU Shan, LIAO Lei, WEI Li, LI Xuanni, CAO Lei, WANG Xin. Adsorption of Heavy Metal Ions from Leachate by Chitosan Cross-linked Humic Acid Gel Beads. Materials Reports, 2023, 37(3): 21040317-8.
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2023, Vol. 37 
