Synthesis of triethylenetetramine modified sodium alginate/CuS nanocrystal composite for enhanced Cr(VI) removal: Performance and mechanism

三乙烯四胺 六价铬 吸附 光催化 化学 复合数 吸光度 纳米晶 柠檬酸 朗缪尔吸附模型 核化学 化学工程 无机化学 材料科学 催化作用 有机化学 纳米技术 色谱法 复合材料 工程类
作者
Shaojie Wu,Cheng Han,Lili Xin,Mingyang Li,Hongming Long,Xiangpeng Gao
出处
期刊:International Journal of Biological Macromolecules [Elsevier BV]
卷期号:238: 124283-124283 被引量:22
标识
DOI:10.1016/j.ijbiomac.2023.124283
摘要

Photocatalysis has been widely used for the removal of hexavalent chromium from wastewater as an efficient and environmental friendly method. However, conventional photocatalysts generally exhibit poor adsorption properties toward Cr(VI), resulting in unsatisfactory performance in high concentrated wastewaters. In this study, we synthesized a novel composite material with high Cr(VI) adsorption ability by blending prepared CuS nanocrystals into triethylenetetramine modified sodium alginate for the enhanced photocatalytic removal of Cr(VI). Effect of CuS dosage, pH value, light source and intensity were discussed for the optimum Cr(VI) removal conditions. The synthesized composite has shown good adsorption performance toward Cr(VI) and the overall removal rate reached 98.99 % within 50 min under UV light irradiation with citric acid as hole scavenger. Adsorption isotherm, thermodynamics, and kinetics with corresponding model fitting were discussed, which suggested that the monolayer and chemical adsorption dominated the adsorption process. Characterization results indicated that amino and hydroxyl groups contributed electrons in the photocatalysis reaction for the reduction of Cr(VI) to Cr(III). CuS nanocrystals can enhance the surface charge and light absorbance ability of the composite, and the Cr(VI) removal was governed by electrostatic interaction and photo-induced redox reaction.
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