Single phase of Cr-doped SrTiO3 (SrTi1−xCrxO3, x = 0–0.2) nanoparticles (15–20 nm) were successfully synthesized by themicrowave assisted-solvothermal synthesis method in KOH methanol oleic acid solution. The small amount of chromium doping (x = 0.005) resulted in excellent visible light photocatalytic activity up to the wavelength of = 627nm (red light LED). The high photocatalytic activity in the visible region was caused by generating the new absorption in the visible region.
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