title: A visible-light-driven core-shell like Ag2S@Ag2CO3 composite photocatalyst with high performance in pollutants degradation.
abstract: A series of Ag2S-Ag2CO3 (4%, 8%, 16%, 32% and 40% Ag2S), Ag2CO3@Ag2S (32%Ag2S) and Ag2S@Ag2CO3 (32%Ag2S) composite photocatalysts were fabricated by coprecipitation or successive precipitation reaction. The obtained catalysts were analyzed by N2 physical adsorption, powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, UV-vis diffuse reflectance spectroscopy and photocurrent test. Under visible light irradiation, the influences of Ag2S content and core-shell property on photocatalytic activity and stability were evaluated in studies focused on the degradation of methyl orange (MO) dye, phenol, and bisphenol A. Results showed that excellent photocatalytic performance was obtained over Ag2S/Ag2CO3 composite photocatalysts with respect to Ag2S and Ag2CO3. With optimal content of Ag2S (32 wt%), the Ag2S-Ag2CO3 showed the highest photocatalytic degradation efficiency. Moreover, the structured property of Ag2S/Ag2CO3 greatly influenced the activity. Compared with Ag2S-Ag2CO3 and Ag2CO3@Ag2S, core-shell like Ag2S@Ag2CO3 demonstrated the highest activity and stability. The main reason for the boosting of photocatalytic performance was due to the formation of Ag2S/Ag2CO3 well contacted interface and unique electron structures. Ag2S/Ag2CO3 interface could significantly increase the separation efficiency of the photo-generated electrons (e(-)) and holes (h(+)), and production of OH radicals. More importantly, the low solubility of Ag2S shell could effectively protect the core of Ag2CO3, which further guarantees the stability of Ag2CO3.
authors.affiliation: School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China. Electronic address: yuchanglinjx@163.com.
authors.forename: Changlin
authors.initials: C
authors.lastname: Yu
authors.affiliation: School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China.
authors.forename: Longfu
authors.initials: L
authors.lastname: Wei
authors.affiliation: School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China.
authors.forename: Wanqin
authors.initials: W
authors.lastname: Zhou
authors.affiliation: Environmental Engineering and Science Program, Department of Biomedical, Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, OH 45221, United States.
authors.forename: Dionysios D
authors.initials: DD
authors.lastname: Dionysiou
authors.affiliation: School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China.
authors.forename: Lihua
authors.initials: L
authors.lastname: Zhu
authors.affiliation: School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Shu
authors.affiliation: Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, PR China. Electronic address: liuhong@cigit.ac.cn.
authors.forename: Hong
authors.initials: H
authors.lastname: Liu
mesh_terms: D001391:Azo Compounds / Q000737:chemistry; D001559:Benzhydryl Compounds / Q000737:chemistry; D002254:Carbonates / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry; D008027:Light; D019800:Phenol / Q000737:chemistry; D010636:Phenols / Q000737:chemistry; D010782:Photolysis; D018030:Silver Compounds / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D000098826:Bisphenol A Compounds
chemical_list: D001391:Azo Compounds; D001559:Benzhydryl Compounds; D002254:Carbonates; D004396:Coloring Agents; D019800:Phenol; D010636:Phenols; D018030:Silver Compounds; D014874:Water Pollutants, Chemical; C100258:methyl orange; C013251:silver sulfide; C006780:bisphenol A; D000098826:Bisphenol A Compounds; C033260:silver carbonate
keywords: Ag(2)CO(3); Ag(2)S; Core-shell; Photocatalytic degradation; Water pollutants