Quantum Sized Zinc Oxide Immobilized on Bentonite Clay and Degradation of C.I. Acid Red 35 in Aqueous under Ultraviolet Light

Abstract

Nano-ZnO supported on bentonite was prepared to form composite photocatalyst by sol-gel method. The photocatalyst was analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscope (TEM). C.I. Acid Red 35 was used as simulating contaminant to be treated by ultraviolet light synergistic with nano-ZnO/bentonite. The results show that 5.7 nm ZnO particle was acquired and uniformly dispersed on the surface of the bentonite at calcination temperature of 200°C. The removal of C.I. Acid Red 35 could reach 84.9% after 200 min under optimum ZnO/bentonite dosage of 0.6 g L−1. The 60% ZnO content in ZnO/bentonite composite exhibited a great photocatalytic activity to treat C.I. Acid Red 35. The photocatalytic process followed pseudo-first-order kinetics and the best apparent rate constant was 0.00927 min−1with correlation coefficient (R2) of above 0.98.

Photocatalytic decolorization of cationic and anionic dyes over ZnO nanoparticle immobilized on natural Tunisian clay

“…Zinc oxide as a semiconductor, (ZnO, 3.37 eV), has been historically used for the removal 63 of CR or MG from water due to its high photo sensitivity, large band-gap, stability and relatively 64 low toxicity (Saikia et original raw clay and pure ZnO, the composite material exhibited considerably higher 77 photocatalytic activity in the photodecomposition of Acid Red 35 in water solution under 78 ultraviolet irradiation (Xu et al 2015). In another study, ZnO particle supported on commercial 79…”

Sensitive Metal Oxide-Clay Nanocomposite Colorimetric Sensor Development for Aflatoxin Detection in Foods: Corn and Almond

“…As shown in Figure i, the FT-IR spectra of ZnO NPs and ZnOBt were compared, indicating the presence of bentonite and ZnO NPs in the intercalated nanocomposite. The composite showed the band location at around 1500–1350 cm –1 for N–H stretch of bentonite and at around 800–400 cm –1 for ZnO stretch. , The absorption in the region around 1574 cm –1 and band centered at 1132 cm –1 was related to the H–O–H bending vibration of water and siloxane (−Si–O–Si−) group stretching for bentonite. ,, The capping agent and stabilization of as-synthesized ZnO NPs may be due to the coordination of ZnO NPs with CO and −OH groups. , Other bands in the region between 1200 and 800 cm –1 were identified as Si–O–Al, Si–O–Si, and Al–OH–Mg peaks at 921.53, 1132.66, and 1574.23 in the ZnOBt nanocomposite. Thus, characterization revealed ZnOBt synthesized for prevented free release of supported Zn NPs into the environment, prevented agglomeration, and effective colorimetric AFs detection in the food matrix in this study.…”

“… 57 , 58 The absorption in the region around 1574 cm –1 and band centered at 1132 cm –1 was related to the H–O–H bending vibration of water and siloxane (−Si–O–Si−) group stretching for bentonite. 31 , 51 , 59 The capping agent and stabilization of as-synthesized ZnO NPs may be due to the coordination of ZnO NPs with C=O and −OH groups. 49 , 60 Other bands in the region between 1200 and 800 cm –1 were identified as Si–O–Al, Si–O–Si, and Al–OH–Mg 31 peaks at 921.53, 1132.66, and 1574.23 in the ZnOBt nanocomposite.…”

Clay-Supported Metal Oxide Nanoparticles in Catalytic Advanced Oxidation Processes: A Review

“…Along with the increasing particle size, clay destruction may occur due to the rapid heating rate, which is directly expressed by the reduced specific surface area. The pillaring of hectorite and montmorillonite with ZnO demonstrated these variable synthesis outcomes [ 116 , 117 ]. Comparing the formation of metal oxide phase in pillared clay form with the formation of pure metal oxide nanoparticles is a better approach.…”