Effective photocatalytic degradation of organic dyes using ZNC/rGO nanocomposite photocatalyst derived from ZIF-8/rGO thermolysis for water treatment

光催化 石墨烯 材料科学 光电流 纳米复合材料 氧化物 介电谱 化学工程 拉曼光谱 纳米技术 化学 电化学 有机化学 光电子学 电极 催化作用 物理化学 冶金 工程类 物理 光学
作者
Mahmoud M. Kaid,Ossama Elbanna,S.A. El-Hakam,Hani M. El‐Kaderi,Amr Awad Ibrahim
出处
期刊:Journal of Photochemistry and Photobiology A-chemistry [Elsevier BV]
卷期号:430: 114001-114001 被引量:24
标识
DOI:10.1016/j.jphotochem.2022.114001
摘要

Photocatalytic water treatment using nano-structured semiconductors with in situ generations of electron-hole pairs upon irradiation with light is a very promising oxidation process for environmental remediation. Herein, we report a new synthetic strategy based on coupling semiconductors derived from ZNC (carbonaceous nitrogen-doped zinc oxide) and rGO (reduced graphene oxide) to enhance the electron-hole separation and reduce the recombination of photogenerated charge carriers. ZNC derived from ZIF-8) Zeolitic Imidazolate Framework-8) is a good n-type semiconductor, and rGO is a highly conducting material. The new photocatalytic system, ZNC/rGO, with a bandgap of 2.8 eV, was used to treat wastewater containing methylene blue (MB) dye which is oxidized to environmentally friendly substances (CO2 and H2O). All samples were characterized thoroughly using XRD, FT-IR, XPS, Raman, TGA, SEM, TEM, surface area measurements (SBET), UV–vis spectroscopy, photocurrent response, Mott-Schottky plots, and electrochemical impedance spectroscopy (EIS). The higher photocurrent response intensity of ZNC/rGO compared to that of ZNC reflects the synergistic effect of rGO to enhance the charge separation efficiency. It is worth noting that the loading of a small amount of rGO over ZIF-8 followed by thermolysis results in a great enhancement of MB dye degradation from 51% to 98.9% under simulated solar light irradiation. Finally, we expect the novel photocatalyst, ZNC/rGO, to have important applications in the fields of energy and environmental protection. Synopsis: Thermolysis of ZIF-8/graphene oxide composite affords a highly active photocatalyst for organic pollutant degradation, making water desalination more feasible.
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