Photocatalysis is a rapidly expanding technology where a diverse range of toxic chemicals can be completely degraded in water. In this study, an efficient photocatalytic method for the degradation of the aquatic pollutant, emamectin benzoate, coupled with a novel electrochemical monitoring method is reported for the first time. Photocatalytic reactions were performed in a slurry-based reactor containing either a ZnO or TiO2 photocatalyst irradiated with 365nm UV-LEDs. Electrochemical monitoring was accomplished using Square Wave Voltammetry using a cathodically pre-treated boron doped diamond indicator electrode. Parameters such as initial pollutant concentration, solution pH and photocatalyst dosage, were investigated to optimise the process. ZnO provided a higher initial rate of degradation than TiO2 at all concentrations investigated, but the overall degradation profiles were similar. This novel technique allowed a large range of parameters to be rapidly and effectively scrutinised using electrochemical monitoring of the degradation.
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The application of voltammetric techniques for the detection and monitoring of the photocatalytic degradation of organic pollutants in waterAuthor: McCormick, W., Jul 2023
Student thesis: Doctoral Thesis › Doctor of Philosophy