文献类型：期刊文献

英文题名：Adsorption-photoreduction behaviors and mechanisms of layered double hydroxide loaded on uranium(vi) removal

作者：Ling, Qian[1];Kuang, Peiling[1];Zhong, Xin[1];Hu, Baowei[1]

机构：[1]Shaoxing Univ, Sch Life & Environm Sci, Huancheng West Rd 508, Shaoxing 312000, Peoples R China

年份：2023

卷号：52

期号：24

起止页码：8247

外文期刊名：DALTON TRANSACTIONS

收录：SCI-EXPANDED(收录号：WOS:000997410900001)、、EI(收录号：20232414215891)、Scopus(收录号：2-s2.0-85161567217)、WOS

基金：We sincerely appreciate the "leading talent training plan of colleges and universities in Zhejiang Province". Financial support from the Research Fund Program of National Natural Science Foundation of China (No. 22106107), and Natural Science Foundation of Zhejiang Province (LY23B070003).

语种：英文

外文关键词：Adsorption - Chemical bonds - Cost effectiveness - Efficiency - Electronegativity - Energy gap - Photocatalytic activity - Sulfur compounds - Uranium dioxide - Wastewater disposal - Wastewater treatment

外文摘要：The synthesis and development of cost-effective and high-efficiency adsorption-photocatalysis bifunctional treatment agents for uranium-containing wastewater is of great importance. In this work, we successfully synthesized layered double hydroxides (LDHs, NiAl and ZnNiAl) with different nickel coordination environments and investigated the adsorption activity and photocatalytic removal performance of uranium (U(vi)) under visible light. The adsorption experimental results showed that the adsorption capacity of NiAl was about four times that of ZnNiAl, and the excellent adsorption properties of NiAl originated from its large surface area and surface Ni-OH groups, which had a high coordination ability toward U(vi). In addition, NiAl had a narrower band gap than ZnNiAls due to the electronegativity of Ni2+(1.91) being greater than Zn2+(1.65), and NiAl (0.055 h(-1)) exhibited a higher efficiency of U(vi) photoreduction than ZnNiAl (0.0138 h(-1)) under visible light. Thus, NiAl showed dual properties of adsorption and photoreduction. In the process of photocatalysis, the photogenerated electrons and generated O-2(-) radicals could reduce the absorbed U(vi) into insoluble UO2(s) and U3O8. Consequently, photocatalytic reduction could further improve the performance of NiAl in removing U(vi) from the solution. NiAl with its low cost and disposal simplicity could be exploited for the decontamination of U(vi), involving surface complexation and photocatalytic reduction.