Visible light-driven photocatalytic reduction of monovalent silver using a composite of Ni3Bi2S2 and O-doped gC3N4

被引:5
|
作者
Ajiboye, Timothy O. [1 ,2 ]
Oyewo, Opeyemi A. [3 ]
Ben Smida, Youssef [4 ]
Onwudiwe, Damian C. [1 ,2 ]
机构
[1] North West Univ, Fac Nat & Agr Sci, Mat Sci Innovat & Modelling MaSIM Res Focus Area, Mafikeng Campus,Private Bag X2046, ZA-2735 Mmabatho, South Africa
[2] North West Univ, Fac Nat & Agr Sci, Dept Chem, Sch Phys & Chem Sci, Mafikeng Campus,Private Bag X2046, ZA-2735 Mmabatho, South Africa
[3] Univ Johannesburg, Dept Sci & Technol Educ, Johannesburg, South Africa
[4] Univ Carthage, Natl Ctr Mat Sci Res, Lab Valorizat Useful Mat, Technopole Borj Cedria,BP 73, Soliman 8027, Tunisia
基金
新加坡国家研究基金会;
关键词
Functionalized gC(3)N(4); Silver(I) ions; Photocatalysis; Nickel bismuth sulphide; WASTE-WATER; METAL-IONS; NANOPARTICLES; DEGRADATION; G-C3N4; TIO2; PH; TRANSFORMATION; RECOVERY; REMOVAL;
D O I
10.1016/j.rineng.2022.100540
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this study, nickel bismuth sulphide (Ni2Bi2S3) was synthesized through solvothermal method and was used to functionalize oxygen-doped graphitic carbon nitride to form a nanocomposite (Ni2Bi2S3/O-gC(3)N(4)). Characterizations of the nanocomposite were carried out using X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and UV-vis spectrophotometer. The nanocomposite was used to photocatalytically reduce monovalent silver to useful metallic silver. The effects of process parameters including Ag+ concentration, pH of the solution, the dosage of the photocatalyst, light intensities, addition of persulfate and mixed organic pollutants were studied, and the data obtained were fitted into pseudo-first order kinetics. About 93.08% (pseudo first order rate constant of 0.0460 min(-1)) of Ag+ was photocatalytically removed within 1 h using 25 mg of the photocatalyst. Mixed organic pollutants and persulfate were found to have inhibitory effects on the rate of photocatalytic reduction. Finally, the Ni2Bi2S3/O-gC(3)N(4) photocatalyst was found to retain over 80% of its efficiency even after three cycles, and the scavenging experiment revealed that electrons, holes and superoxide played prominent roles in the photocatalytic process.
引用
收藏
页数:11
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