Activated carbon-supported AgMoOS bimetallic oxysulfide as a catalyst for the photocatalytic hydrogen evolution and pollutants reduction

• Published in: Journal of alloys and compounds 2022-08, Vol.913, p.165287, Article 165287
• Main Authors: Abdeta, Adugna Boke, Wu, Qinhan, Kuo, Dong-Hau, Li, Ping, Zhang, Hanya, Zhang, Jubin, Yuan, Zhanhui, Lin, Jinguo, Chen, Xiaoyun
• Format: Article
• Language: English
• Subjects: Activated carbon; AgMoOS@AC; Bimetals; Catalysts; Catalytic activity; Dispersion; Hydrogen evolution; Light irradiation; Nanoparticles; Photocatalysis; Pollutant; Pollutants; Reagents; Silver; Sodium sulfide; Sodium sulfite
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2022.165287

Activated carbon (AC) with high porosity and surface area as a catalyst carrier can enhance the catalytic activity and stability of metal nanoparticles with well dispersion to avoid aggregation. Herein, silver molybdenum oxysulfide (AgMoOS) nanoparticles supported by activated carbon with different porous sizes were synthesized through a facile method for photocatalytic H2 evolution reaction and pollutants reduction. The highest H2 evolution of 338.9 µmol/h was obtained by microporous AC-supported AgMoOS (AgMoOS@AC-1) under visible-light irradiation using Na2S/Na2SO3 as a hole scavenger reagent. Likewise, 76.9% of the 4-NP reduction is achieved by in-situ generated proton within 160 min. AC could lower the recombination rate of photo carriers due to its pore channels. Under the dark condition, 10 mg AgMoOS@AC-1 completely reduced MB, MO, RhB, 4-NP, and Cr6+ within 4, 4, 9, 9, and 12 min, respectively. This excellent catalytic activity is due to a good dispersion of AgMoOS nanoparticles on AC-1, electron hopping transport of Mo4+→ Mo6+ ions, and surface oxygen vacancy. AgMoOS@AC catalyst also exhibits good stability and efficiency that provides a practical catalytic application to reduce chemical pollutants and environmental remediation. [Display omitted] •Uniformly deposited AgMoOS nanoparticles on the surface of AC synthesized.•Dispersion of AgMoOS on AC is important for AgMoOS@AC catalytic activity.•AC Pores used as e− reservoir and increases efficiency of photocatalytic performance.•Oxygen vacancy and e- hopping transport in Mo4+/Mo6+ improved the activities.•Reduction mechanism over AgMoOS@AC catalyst proposed and discussed.