International Journal of Health Studies2423-65943020170101Photocatalytic Degradation of 4-Nitro Phenol in Aqueous Solution by the AgInS2 Nanoparticles Synthesized via Microwave Heating Technique20520510.22100/ijhs.v3i0.205ENAmir HosseinCheshme Khavar 11. Dept. of Basic Science, Tarbiat Modares University, Tehran, Iran.. moslem.jafarisani@gmail.comMoslemJafarisani 2*201701162017041520170306Background: With increasing demands for environmental protection,photocatalysis has attracted great attention, and AgInS2 basedphotocatalysis are an attractive system to study.Methods: In this work, AgInS2 (AIS) nanoparticles were synthesizedvia the microwave heating process with the power of 900 W for 5 min,which showed excellent photocatalytic activities upon the degradationof 4-nitro phenol (4-NP) under visible light irradiation.Results: The optimum catalyst showed the removal efficiency up to97%, of 4-NP with the 15 mg L−1 concentration from the water after80 min photocatalytic reaction time. The mechanism of photocatalysiswas also analyzed. The product was characterized by PXRD, FE-SEM,TEM, and UV-Vis spectroscopy. A scanning electron microscope andtransmission electron microscope revealed the particle morphology,with the average size of 70 nm. Powder X-ray diffraction confirmedthat the resultant product is a pure orthorhombic phase of AISnanoparticles. The band gap energy of 1.96 eV estimated by the diffusereflectance spectroscopy (DRS), exhibited that this product can beprone for photocatalytic activity in the visible region.Conclusions: It is suggested that the AgInS2 nanoparticles developedin our work can provide a new platform for the design of highlyefficient photocatalysts under visible light irradiation.