Fast and quick degradation properties of doped and capped ZnO nanoparticles under UV–Visible light radiations. (February 2016)

• Record Type: Journal Article
• Authors: Mittal, Manish; Sharma, Manoj; Pandey, O.P.
• Is Part Of: Solar energy. Volume 125(2016)
• Page Start: 51
• Page End: 64
• Publication Date: 2016-02
• Subjects: ZnO -- Photocatalytic degradation -- Nanoparticles -- Doping -- pH; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2015.12.003
• Languages: English
• ISSNs: 0038-092X

Abstract

Graphical abstract: Highlights: Nano-sized undoped and Mn doped ZnO has been synthesized by co-precipitation route. PL spectra for doped samples show large absorption and emission in visible region. Degradation of CV dye with doped samples synthesized at various pH is discussed. Fast degradation of CV dye with optimized photocatalyst with H2 O2 has been observed. Cationic and industrial dyes were degraded successfully. Abstract: Undoped and Manganese (Mn) doped zinc oxide (ZnO) (Zn1− x Mn x O, x = 0.005, 0.01, 0.015 and 0.02) nanoparticles (NPs) capped with (1.0%) Thioglycerol (TG) has been successfully synthesized by co-precipitation method. Optical and morphological studies have been done for photophysical and structural analysis of synthesized materials. The photocatalytic activity of undoped and Mn doped ZnO NPs were investigated by degradation of crystal violet (CV) dye under UV–Visible light radiations. It has been found that Mn (1.0%) doping concentration is optimal for photophysical and photocatalytic properties. When the pH of as synthesized optimum doped ZnO NPs varied from natural pH i.e. from 6.7 to 8.0 and 10.0, the degradation of CV dye increases from 92% to 95% and 98% in 180 min respectively. Further on increasing the pH of optimum doped synthesized NPs to 12.0, almost 100% degradation has been achieved in 150 min. Optimum doped photocatalyst synthesized at pH-12.0 has also effectively degraded the CV dye solution in acidic and basic medium thus showed its utility in various industries. However, it has been found that 100% of CV dye quickly degraded in 30 min when only 1.0% of hydrogen peroxide (H2 O2 ) was introduced along with optimized NPs synthesized at pH-12. Kinetic studies show that the degradation of CV dye follows pseudo first and second-order kinetic law. Further an industrial anionic polyazo Sirius red F3B (SRF3B) dye has been degraded to 100% with optimized NPs synthesized at pH-12.0 in 15 min only.