Efficient photocatalytic degradation of Acid Red 57 using synthesized ZnO nanowires

Abstract

Zinc oxide photocatalyst was synthesized through a low‐temperature co‐precipitation process using zinc sulfate as precursor for the degradation of Acid Red 57 (AR57) under UV irradiation. The activities of the prepared photocatalyst at different calcination temperatures (400, 500, and 600 °C) were investigated. The synthesized zinc oxides were characterized by different techniques such as X‐ray diffraction, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, N2 adsorption–desorption, and pH titration for the determination of the zero‐point charge (pHZPC). The efficiency of photocatalytic degradation of ZnO prepared at the calcination temperatures of 400, 500, and 600 °C was 90.03, 77.67, and 72.71%, respectively, after 190 min. The kinetics and scavengers of the reactive species during the degradation were also investigated. It was found that the degradation of AR57 fitted first‐order kinetics and the OH• radicals were the main species. During irradiation, the formation of OH• free radicals was ascertained by photoluminescence studies using terephthalic acid as the probe molecule.

Eco‐friendly synthesis of ZnO nanorods using Cycas pschannae plant extract with excellent photocatalytic, antioxidant, and anticancer nanomedicine for lung cancer treatment

“…UV irradiation was carried out in a cubic UV chamber with a 40 W UV lamp emitting at 365 nm. The photocatalytic activity of 5 g/L ZnO NRs was diluted with 30 mg/L MB dye was maintained at pH 7, and solution mixtures were kept for the sonication process to obtain a homogenous mixture . The homogenous solution of ZnO NRs and MB was transferred to a photoreactor quartz tube retained in a photoreactor with a continuous stirrer.…”

“…The photocatalytic activity of 5 g/L ZnO NRs was diluted with 30 mg/L MB dye was maintained at pH 7, and solution mixtures were kept for the sonication process to obtain a homogenous mixture. [29] The homogenous solution of ZnO NRs and MB was transferred to a photoreactor quartz tube retained in a photoreactor with a continuous stirrer. The photo-degradation was analyzed at 365 nm and the degradation activity was monitored and calculated at 10-min intervals.…”

Hydrangea‐like ZnO nanospheres on Al substrates via hydrothermal synthesis for photocatalytic activity

“…X‐ray diffraction (XRD) patterns of ZnO nanospheres and standard XRD patterns are shown in Figure a. As you can see from the diagram, after the comparison with the reference card, it is true that the peak of sample at 34.47° can be assigned to the (002) peak of ZnO, according to JCPDS: 36‐1451 . In accordance with JCPDS: 04‐0787, the peaks at 38.4°, 44.7°, 65.1°, and 78.2° can be indexed to (111), (200), (220), and (311) planes of Al .…”

Parameters affecting carbofuran photocatalytic degradation in water using ZnO nanoparticles

“…3,[8][9][10][11][12] Zinc oxide is a semiconductor photocatalyst in group II-VI, its band energy is wide (3.37 eV), and elevated thermally and mechanically stable at room temperature, and also has high bond energy (60 meV). [13][14][15][16] Zinc oxide is capable of absorbing visible light and ushering in the era of solar photocatalysis, soluble in water, 17 and ends up as a zinc metal in the ecosystem which makes it an [Correction added on 3 June 2020 after first online publication: Captions for Figure 1 to 17 has been updated.] attractive water treatment catalyst, 15 and also by considering that this treated wastewater will be used in agriculture, and then there will be no need to remove zinc oxide after the treatment process as it is considered as a source of zinc element which plants need.…”