Molten salt synthesis of Z-scheme CeO_(2)/C_(3)N_(4) photocatalysts with excellent properties for removal of organic pollutants:Characterization,kinetics and mechanisms  

作　　者：Deyang Ning Junqi Li Yuanpei Lan Hong Yong Sohn Jian Yang Chaoyi Chen Zhiyao Chu Xisong Mao 

机构地区：[1]Department of Metallurgical Engineering,College of Materials and Metallurgy,Guizhou University,Guiyang 550025,China [2]Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving,Guiyang 550025,China [3]Department of Materials Science&Engineering,University of Utah,Salt Lake City,UT,84112,USA [4]College of Materials Science and Engineering,Chongqing University,Chongqing 40044,China

出　　处：《Journal of Rare Earths》2023年第8期1153-1162,I0002,共11页稀土学报（英文版）

基　　金：supported by National Natural Science Foundation of China(52164025,51804088,U1812402);Basic Research Program from Science&Technology Department of Guizhou Province([2020]1Y219,[2019]1082)。

摘　　要：In this work,we firstly synthesized a CeO_(2)/C_(3)N_(4) photocatalyst with Z-scheme heterojunction by a facile LiC-KCI molten salt method.The synthesized catalyst has an excellent quality for removing organic pollution of dyes and antibiotics in wastewater.As an example,the CeCN-1:5 prepared with a mass ratio of Ce_(2)(CO_(3))_(3)·xH_(2)O:C_(3)H_(3)N_(6)=1:5 exhibits a methylene blue(MB)removal capacity of 100%within 90 min and tetracycline(TC)removal capacity of 94.6%.After 4 cycles,the CeCN-1:5 keeps a removal efficiency of nearly 100%in 150 min for MB and 85.7%for TC.The kinetics study reveals that the MB removal process with the CeCN-1:5 fits the modified Elovich model with strong adsorption while TC removal fits the first-order model.The large surface area(238 m^(2)/g)and negative zeta potential(-39.3 mV)of CeCN-1:5 contribute to superior adsorption capacity to MB.However,the adsorption of TC is restricted due to the positive surface/pore potential in acidic solution.CeCN-1:5has combined Z-scheme heterojunction and exhibits a low recombination rate of electrons(e^(-))/holes(h^(+))and the photo-generated active radicals of·OH/·O_(2)^(-)that promotes the photocatalytic performance.This novel CeO_(2)/C_(3)N_(4) photocatalyst with an excellent photocatalysis removal activity has an enormous potential for photocatalytic applications.

关 键 词：Molten salt synthesis CeO_(2)/C_(3)N_(4)composite Kinetic modeling Adsorption PHOTODEGRADATION Rare earths 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X703[环境科学与工程—环境工程]