Abstract
In this work, a ZnO-layered double hydroxide@graphitic carbon nitride composite (ZnO-LDH@C3N4) was synthesized via co-precipitation method with solvothermal treatment. The structure and morphology of ZnO-LDH@C3N4 composite were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopes/transmission electron microscopes (SEM/TEM), N2 adsorption/desorption, ultraviolet visible diffuse reflectance spectroscopy (UV-Vis-DRS), photoluminescence spectrometer (PL) and electrochemical impedance spectroscopy (EIS). The adsorption and photocatalytic properties of ZnO-LDH@C3N4 composite towards the organic dyes: Orange II sodium salt (OrgII, an anionic azo dye) and methylene blue (MB, a cationic azo dye) were investigated. Compared to ZnO-LDH and g-C3N4, the ZnO-LDH@C3N4 composite displayed an excellent performance in both adsorption and photocatalytic degradation of the organic dyes. Moreover, a combination of ZnO-LDH and g-C3N4 significantly improved the photocatalytic performance of ZnO-LDH and g-C3N4 under visible-light irradiation. The adsorption and photocatalytic mechanism were also investigated.
Highlights
Several commonly used dyes that are toxic and mutagenic for aquatic organisms can even be carcinogenic for humans [1]
We report a simple method for the design and preparation of a ZnO-layered double hydroxides (LDHs)@C3 N4 composite with improved adsorption and photocatalytic properties towards both anionic and cationic dyes present in water
ZnO-LDH@Ccarriers and the fitting plots of photogenerated trapping in the photodegradation of Methylene Blue (MB) by ZnOdata and and the3fitting fitting plots of photogenerated carriers trapping in the photodegradation of MB by the plots of photogenerated carriers trapping in the photodegradation of MB by ZnON4 under visible-light irradiation
Summary
Several commonly used dyes that are toxic and mutagenic for aquatic organisms can even be carcinogenic for humans [1]. Photocatalytic degradation is a sustainable and green approach to removing the adsorbed dyes These LDHs and their derivatives are only photocatalytically active under UV light [6]. These LDH-based materials showed little adsorption towards cationic dyes and did not show good photocatalytic performance under visible lights. Di et al reported that a sphere-like g-C3 N4 /BiOI composite exhibited a higher photocatalytic activity in the photodegradation of dyes than pure BiOI, which was due to the enhanced electron-hole separation and broadened light absorption range [16]. We report a simple method for the design and preparation of a ZnO-LDH@C3 N4 composite with improved adsorption and photocatalytic properties towards both anionic and cationic dyes present in water
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