Enhanced photocatalytic degradation of organic dyes from aqueous environment using neodymium-doped mesoporous layered double hydroxide

作     者：Ajaz Ahmad Wani Amjad Mumtaz Khan Yahiya Kadaf Manea Mansour A.S.Salem Ajaz Ahmad Wani;Amjad Mumtaz Khan;Yahiya Kadaf Manea;Mansour A.S.Salem

作者机构：Department of ChemistryAligarh Muslim UniversityAMUAligarh202002India 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2022年第40卷第10期

页      面：1554-1563页

核心收录：

学科分类：081704[工学-应用化学] 081705[工学-工业催化] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0815[工学-水利工程] 0703[理学-化学] 

基　　金：Junior Research Fellowship provided by CSIR-UGC (55/CSIRNETJUNE2019)New Delhi 

主　　题：Organic pollutants Degradation Multifunctional Mesoporous LC-MS Rare earths 

摘      要：Neodymium-doped Zn-Al layered double hydroxide(Nd/Zn-Al LDH) with excellent photocatalytic activity was prepared by a one-step hydrothermal method. The morphology and physicochemical properties of as-synthesized photocatalysts were well analyzed by Fourier transform infrared(FT-IR), X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), photoluminescence(PL), UV-diffuse reflectance spectroscopy(UV-DRS), and Brunauer-Emmett-Teller(BET)surface analysis. Doping Nd^(3+) into Zn-Al LDH enhances the overall catalytic activity of the nanocomposite, like better electron-hole pair separation, increase in interplanar distance, fast electron transfer, and large surface area. The as-prepared nanocomposite shows excellent degradation of three different dyes under visible light irradiation. The degradation efficiency of these dyes follows the order of Congo red rose Bengal fast green. Furthermore, liquid chromatography-mass spectrometry(LC-MS)was employed to propose a possible photocatalytic degradation pathway for Congo Red and Rose Bengal dyes by Nd/Zn-Al LDH. With the help of radical trapping experiments, it is revealed that during the photoexcitation process, the primary reactive intermediates are hydroxyl radicals.