石墨相氮化碳/壳聚糖复合材料对水中U(Ⅵ)的吸附性能与机理

Adsorption performance and mechanism of g-C3N4/CS composite for U(Ⅵ)from aqueous solution

王悦 ¹彭琳 ¹刘金香 ²王劲松 ²鲜寒 ¹刘迎九¹

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作者信息

1. 南华大学土木工程学院,湖南衡阳 421000
2. 南华大学土木工程学院,湖南衡阳 421000;南华大学污染控制与资源化技术湖南省重点实验室,湖南衡阳 421000
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摘要

针对核能发展与应用过程中产生的含铀废水所导致的环境铀污染难题,通过共混交联法将石墨相氮化碳(g-C3N4)负载在壳聚糖(CS)上,制备了复合材料-石墨相氮化碳/壳聚糖(g-C3N4/CS),用来吸附水溶液中的U(Ⅵ).对g-C3N4/CS的表面性质和作用机制进行了分析.结果表明:g-C3N4/CS投加量为0.2 g/L,g-C3N4质量分数为20％,吸附时间为120 min,温度为308 K,pH=6条件下,g-C3N4/CS对U(Ⅵ)的最大吸附量达到324.45 mg/g.Langmuir等温模型和准二级动力学模型符合该吸附过程,是一个自发吸热过程.g-C3N4/CS对U(Ⅵ)的吸附机理主要为—NH,—OH,C—O,C=O,C—N等官能团与U(Ⅵ)发生的配位络合.g-C3N4/CS在循环再生实验中显示出良好的重复利用性.

Abstract

Aimed at the problem of environmental uranium pollution caused by uranium-containing wastewater generated in the process of nuclear energy development and application,by loading g-C3N4 on chitosan (CS) through the cross-linking method,g-C3N4/CS composite was synthesized and used to remove U(Ⅵ) from aqueous solutions.The surface properties and the interaction mechanism of g-C3N4/CS were analyzed.The results show that when the adsorbent dosage of g-C3N4/CS is 0.2 g/L,mass fraction of g-C3N4 is 20％,adsorption time is 120 min,adsorption temperature is 308 K,and pH is 6,the maximum adsorption capacity of g-C3N4/CS on U(Ⅵ) reaches 324.45 mg/g.The adsorption of U(Ⅵ) by g-C3N4/CS involves a spontaneous endothermic process that follows the Langmuir isotherm model and quasi-second-order kinetic model.The adsorption mechanism of U(Ⅵ) by g-C3N4/CS is primarily attributed to the coordinated complexation of functional groups such as—NH,—OH,C—O,C=O,and C—N.The results of the recycling experiments show that g-C3N4/CS has good reusability.

关键词

铀(Ⅵ)/吸附/石墨相氮化碳/壳聚糖/性能与机制/复合材料

Key words

uranium (Ⅵ)/adsorption/g-C3N4/chitosan/performance and mechanism/composite

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基金项目

国家自然科学基金项目(42177074)

出版年

2024

材料工程

中国航发北京航空材料研究院

材料工程

CSTPCDCSCD北大核心

影响因子：0.78

ISSN：1001-4381

参考文献量45

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