羧基化柚子皮吸附Cd<sup>2+</sup>的性能与机制

doi:10.11896/cldb.23060114

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Abstract In order to explore the feasibility of preparing a heavy metal ions adsorption material with food processing waste pomelo peel as raw material, the methyl carboxyl groups in pomelo peel were hydrolyzed into carboxylic acids by NaOH. The C-6 primary hydroxyl groups in pomelo peel were oxidized to carboxylic acids by TEMPO/sodium hypochlorite/sodium bromide system. A carboxylated pomelo peel adsorbent was prepared. FTIR, SEM-EDS and XPS were used to characterize the pomelo peel and the carboxylated pomelo peel before and after adsorption of Cd²⁺ for elucidating the mechanism of its influence. The results show that the carboxyl content in the carboxylated pomelo peel is 2.34 mmol/g, which is 10.64 times greater compared with that before modification. The carboxylated pomelo peel can effectively remove Cd²⁺ from aqueous solution. The adsorption of Cd²⁺ using the carboxylated pomelo peel is more in line with Langmuir model and pseudo-second-order model, belong to single-layer and chemical adsorption. The maximum adsorption capacity of the carboxylated pomelo peel for Cd²⁺ is 76.16 mg/g and 5.81 times that before modification. It could be proved that the carboxyl groups (-COO^-) contained in the carboxylated pomelo peel are functional groups, which adsorb Cd²⁺ in the solution and form carboxylic acid cadmium. They (-COO^-) are acting as a bidentate chelate coordinate to Cd²⁺. The process of adsorption of Cd²⁺ using the carboxylated pomelo peel is an exchange process of cations (Na⁺ and Cd²⁺).

Key words： carboxyl group pomelo peel Cd²⁺ adsorption property adsorption mechanism

Published: 25 October 2024 Online: 2024-11-05

CLC number:	X712
	X52

Fund:Jiangsu Province Industry-University-Research Cooperation Project (BY20221265).

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	Articles by authors
	CHEN Shanglong
	LIU Enqi
	ZHAO Jiechang
	CHEN Anhui
	LIU Hui
	MIAO Jingzhi

Cite this article:

CHEN Shanglong,LIU Enqi,ZHAO Jiechang, et al. Adsorption Properties and Mechanism of Cd²⁺ on Carboxylated Pomelo Peel[J]. Materials Reports, 2024, 38(20): 23060114-7.

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http://www.mater-rep.com/EN/10.11896/cldb.23060114 OR http://www.mater-rep.com/EN/Y2024/V38/I20/23060114

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