壳聚糖交联腐殖酸凝胶球吸附渗滤液中重金属离子研究

doi:10.11896/cldb.21040317

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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.

Key words： chitosan humic acid leachate heavy metal ion adsorption

Published: 10 February 2023 Online: 2023-02-23

CLC number:	TQ424
	X52
	O647.3

Fund:The National Natural Science Foundation of China (51408041).

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	LIU Shan
	LIAO Lei
	WEI Li
	LI Xuanni
	CAO Lei
	WANG Xin

Cite this article:

LIU Shan,LIAO Lei,WEI Li, et al. Adsorption of Heavy Metal Ions from Leachate by Chitosan Cross-linked Humic Acid Gel Beads[J]. Materials Reports, 2023, 37(3): 21040317-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21040317 OR http://www.mater-rep.com/EN/Y2023/V37/I3/21040317

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