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

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Abstract
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

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