Heterogeneous photocatalysis of glove wastewater over green synthesized zno immobilized on natural hydroxyapatite

Leow, Guo Quan (2019) Heterogeneous photocatalysis of glove wastewater over green synthesized zno immobilized on natural hydroxyapatite. Final Year Project, UTAR.

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Abstract

Photocatalytic degradation of glove wastewater has been studied in this research to treat the ongoing water pollution from the glove industry. The green synthesized using plant extracts was emerged as a renewable, cost effectively and environmental friendly method that can be used to synthesis zinc oxide (ZnO) photocatalyst. Corn husk extract was used to synthesis ZnO without the usage of harmful chemicals. Besides that, the ZnO also coupled with the natural hydroxyapatite (HAp) that obtained from buffalo bone to enhance the photocatalysis. ZnO, HAp and ZnO/HAp was characterized through numerous analyses which included X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), Fourier transform infrared spectroscopy (FTIR), Ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS), and Particle Size Analysis (PSA). The ZnO was observed as hexagonal wurtzite structure and HAp was indicate in the XRD analysis. Green synthesized ZnO, HAp and ZnO/HAp was observed as porous and fluffy in nature in the SEM analysis. The fine particle of ZnO and ZnO/HAp was observed through PSA. EDX analysis determines the composition of element that presented in the photocatalyst. The content of HAp on the ZnO was studied in this research by varying 20 wt% to 50 wt % of HAp. The optimum HAp content on ZnO was ZnO-50%HAp was achieved 100 % photocatalytic degradation efficiency of glove wastewater. The effects of initial wastewater concentration and ZnO/HAp catalyst loading were studied. The optimal ZnO-50%HAp catalyst loading was found to be 1 g/L. Consequently, the effect of various scavengers was also investigated to determine the role of each active species in the reaction mechanism. The h+ radicals was observed to be the main reactive species in this studY.

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