羧基化柚子皮吸附Cd2+的性能与机制

doi:10.11896/cldb.23060114

材料导报

2024, Vol. 38

Issue (20): 23060114-7 https://doi.org/10.11896/cldb.23060114

高分子与聚合物基复合材料

羧基化柚子皮吸附Cd²⁺的性能与机制

陈尚龙^1,2,*, 刘恩岐^1,2, 赵节昌², 陈安徽^1,2, 刘辉^1,2, 苗敬芝^1,2

1 徐州工程学院食品与生物工程学院,江苏徐州 221018
2 徐州工程学院江苏省食品资源开发与质量安全重点建设实验室,江苏徐州 221018

Adsorption Properties and Mechanism of Cd²⁺ on Carboxylated Pomelo Peel

CHEN Shanglong^1,2,*, LIU Enqi^1,2, ZHAO Jiechang², CHEN Anhui^1,2, LIU Hui^1,2, MIAO Jingzhi^1,2

1 College of Food and Biological Engineering, Xuzhou University of Technology, Xuzhou 221018, Jiangsu, China
2 Jiangsu Key Laboratory of Food Resources Development and Quality Safe, Xuzhou University of Technology, Xuzhou 221018, Jiangsu, China

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摘要为探索利用食品加工废弃物柚子皮制备一种重金属离子吸附材料的可行性,通过NaOH将柚子皮中甲酯化的羧基水解成羧酸,再利用TEMPO/次氯酸钠/溴化钠体系将柚子皮中C-6位伯羟基氧化成羧酸,制备出一种羧基化柚子皮吸附材料,同时采用FTIR、SEM-EDS和XPS对柚子皮和吸附Cd²⁺前后的羧基化柚子皮进行表征,研究其吸附机制。结果表明羧基化柚子皮中羧基含量为2.34 mmol/g,是改性前的10.64倍,且可以有效地去除水溶液中Cd²⁺。羧基化柚子皮吸附Cd²⁺更符合Langmuir和伪二阶动力学模型,属于单层化学吸附,对Cd²⁺的最大吸附量为76.16 mg/g,是改性前的5.81倍。羧基化柚子皮中羧基(-COO^-)是吸附Cd²⁺的功能性基团,吸附后形成羧酸镉,其中镉以Cd²⁺的形式存在,与-COO^-的配位方式主要是双齿桥式,该吸附过程是一个阳离子(Na⁺和Cd²⁺)交换的过程。

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关键词: 羧基柚子皮 Cd²⁺ 吸附性能吸附机制

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

出版日期: 2024-10-25 发布日期: 2024-11-05

ZTFLH:	X712
	X52

基金资助: 江苏省产学研合作项目(BY20221265)

通讯作者: * 陈尚龙,徐州工程学院食品科学与工程学院高级实验师。2006年徐州工程学院食品科学与工程专业本科毕业,2010年中国矿业大学矿物加工工程专业硕士毕业后到徐州工程学院工作至今,2020年中国矿业大学化学工艺专业博士毕业。目前主要从事固体废弃物资源化利用等方面的研究工作。发表论文30余篇,其中SCI、EI论文7篇,获得发明专利9件。slchen1982@163.com

引用本文:

陈尚龙, 刘恩岐, 赵节昌, 陈安徽, 刘辉, 苗敬芝. 羧基化柚子皮吸附Cd²⁺的性能与机制[J]. 材料导报, 2024, 38(20): 23060114-7.
CHEN Shanglong, LIU Enqi, ZHAO Jiechang, CHEN Anhui, LIU Hui, MIAO Jingzhi. Adsorption Properties and Mechanism of Cd²⁺ on Carboxylated Pomelo Peel. Materials Reports, 2024, 38(20): 23060114-7.

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http://www.mater-rep.com/CN/10.11896/cldb.23060114 或 http://www.mater-rep.com/CN/Y2024/V38/I20/23060114

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