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Facile One‐Pot Solvothermal Synthesis of Noble Metal‐Free NiS Modified In 2 S 3 ‐Based Photocatalyst for Highly Efficient Visible‐Light‐Driven Cr 6+ Removal
Author(s) -
Wang Linjuan,
Zan Ling
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202002228
Subject(s) - photocatalysis , visible spectrum , noble metal , x ray photoelectron spectroscopy , high resolution transmission electron microscopy , photocurrent , charge carrier , materials science , excited state , hydrothermal circulation , electron , photochemistry , metal , nanotechnology , analytical chemistry (journal) , chemical engineering , chemistry , optoelectronics , atomic physics , transmission electron microscopy , physics , catalysis , organic chemistry , quantum mechanics , metallurgy , engineering
Rapidly electrons transferring of noble metal‐free electron mediator NiS modifying In 2 S 3 photocatalysts were synthesized through a one‐pot hydrothermal method. Light with longer wavelength scope and stronger intensity can be absorbed and achieving more rapidly electrons transportation speed. PL and photocurrent spectra demonstrating that NiS‐In 2 S 3 composites have higher charge carrier separation efficiency. HRTEM revealed that NiS and In 2 S 3 were contacted in nano size and have intimate contact with each other. XPS further proved there has an influence of the banding energy between NiS and In 2 S 3 . 10 % content sample achieving complete removal of Cr 6+ with a trace photocatalyst concertation (0.2 mg/mL) within 30 min which was 3 times higher than pure In 2 S 3 . The proper mechanism was proposed that In 2 S 3 was excited by visible light to produce electron‐hole pairs, and NiS acted as a light absorbing intensifier and electron trapper conducting electrons from the In 2 S 3 conduction band to the surface of composites and then reacting with the active species, thus improving the charge carrier separation efficiency and photocatalytic activity