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Investigation on the g-C 3 N 4 encapsulated ZnO nanorods heterojunction coupled with GO for effective photocatalytic activity under visible light irradiation
Arabian Journal of Chemistry ( IF 6 ) Pub Date : 2020-01-01 , DOI: 10.1016/j.arabjc.2018.07.013
N. Kumaresan , M. Maria Angelin Sinthiya , M. Praveen Kumar , S. Ravichandran , R. Ramesh Babu , K. Sethurman , K. Ramamurthi

Abstract The present work reports on a novel ternary nanocomposite of ZnO rods encapsulated by graphitic like carbon nitride (g-C3N4) and coupled with graphene oxide (GO) prepared by ultrasonication assisted hydrothermal method which provides enhanced photocatalytic activity and stability. Field emission scanning electron microscopy analysis showed that the surface morphology of ZnO, g-C3N4 (prepared by heating method) and the GO contains nanorods structures, sheet like structures and sheets with porous structures respectively. Formation of rod like structures of ZnO and thin sheet like structures of g-C3N4 were observed from transmission electron microscopy analysis. Transmission electron microscopy analysis of g-C3N4 (6 wt%)/ZnO nanocomposites showed that ZnO nanorods are encapsulated by the thin sheets of g-C3N4 and g-C3N4(6 wt%)/ZnO/GO (30 mg) ternary nanocomposites contains porous structures of GO. The optical band gap of ZnO nanoparticles was shifted from 3.08 eV to 2.85 eV for g-C3N4(6 wt%)/ZnO/GO(30 mg) ternary nanocomposites. Under visible light irradiation the ZnO nanorods and g-C3N4 (6 wt%)/ZnO showed photodegradation efficiency of ∼21% and 90% respectively for 120 min whereas g-C3N4 (6 wt%)/ZnO/GO(30 mg) showed about 99% photodegradation efficiency in a time period of 14 min. The recycle process carried out for g-C3N4(6 wt%)/ZnO/GO(30 mg) composites up to five cycles showed 91.5% of photodegradation in the fifth cycle for a time period of 14 min. Total Organic Carbon (TOC) analysis shows removal of carbon content 83% in 28 min. The Gas Chromatography-Mass Spectroscopy analysis shows the intermediate products of 1,2 benzenedicarboxylic acid and phthalic acid during the RhB dye photodegradation process. The radical trapping experiment reveals that the photo-induced holes (h+) are one of the main reactive species involved in the degradation of the RhB.

中文翻译:

研究 gC 3 N 4 封装的 ZnO 纳米棒异质结与 GO 在可见光照射下的有效光催化活性

摘要 本工作报告了一种新型三元 ZnO 棒纳米复合材料,该复合材料由类似氮化碳 (g-C3N4) 的石墨包裹并与通过超声辅助水热法制备的氧化石墨烯 (GO) 偶联,该复合材料具有增强的光催化活性和稳定性。场发射扫描电子显微镜分析表明,ZnO、g-C3N4(通过加热法制备)和GO的表面形貌分别含有纳米棒结构、片状结构和具有多孔结构的片状结构。从透射电子显微镜分析观察到 ZnO 棒状结构和 g-C3N4 薄片状结构的形成。g-C3N4 (6 wt%)/ZnO 纳米复合材料的透射电子显微镜分析表明,ZnO 纳米棒被 g-C3N4 和 g-C3N4(6 wt%)/ZnO/GO (30 mg) 三元纳米复合材料的薄片包裹GO的多孔结构。对于 g-C3N4(6 wt%)/ZnO/GO(30 mg) 三元纳米复合材料,ZnO 纳米颗粒的光学带隙从 3.08 eV 变为 2.85 eV。在可见光照射下,ZnO 纳米棒和 g-C3N4 (6 wt%)/ZnO 在 120 分钟内分别显示出~21% 和 90% 的光降解效率,而 g-C3N4 (6 wt%)/ZnO/GO(30 mg)显示出在 14 分钟的时间内,光降解效率约为 99%。对 g-C3N4(6 wt%)/ZnO/GO(30 mg) 复合材料进行的循环过程最多五个循环,在第五个循环中显示 91.5% 的光降解,时间为 14 分钟。总有机碳 (TOC) 分析显示在 28 分钟内去除了 83% 的碳含量。气相色谱-质谱分析显示了 RhB 染料光降解过程中 1,2 苯二甲酸和邻苯二甲酸的中间产物。自由基捕获实验表明,光致空穴 (h+) 是参与 RhB 降解的主要反应物质之一。
更新日期:2020-01-01
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