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Removing pollutants from water is important to maintaining clean environment and eco system.Among various technologies,water purification using photocatalyst is easy and simple to handle,and able to use sunlight directly.[1] The most widely used photocatalyst is TiO2 powder which is cheap,but e-h+ pairs separation occurred mostly under UV light irradiation which is hard to utilize long wavelength region even sunlight consist with large portion of above wavelength of visible light.[2] To utilize sunlight properly,photocatalyst have to be adsorbed long wavelength light and generate e-h+ pairs.Herein,a polymer photocatalyst,g-C3N4 with silver ion supported were developed to degrade organic dye (RhB).The nanostructured g-C3N4 can enhance its photocatalytic activity due to its thin layer which is reduced electron and hole recombination.[3] Moreover metal assisted g-C3N4 can remove organic dye much faster than non-structure,structured g-C3N4 and TiO2 nanoparticle under visible light irradiation (>420nm).The functional organic metal hybrid material exhibited modified electronic properties of g-C3N4.Also unlike sulfide and oxynitride semiconductor,g-C3N4 photocatalyst is stable under light irradiation in water solution as well as in acid or base due to its strong covalent bonds between carbon and nitrogen atoms.The high stability and moderate band gap imply that g-C3N4 has numerous potential application in the photocatalyst field.