Cadmium sulfide sensitized titanium dioxide catalysts for the photoelectrocatalytic degradation of methylene blue

• Main Authors: Wu,Yu-Hsuan, 吳宇玄
• Other Authors: Lin, Yang-Wei
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/tmu8gg

碩士 === 國立彰化師範大學 === 化學系 === 106 === In this study, photoanode prepared by cadmium sulfide sensitized titanium dioxide nanoparticles (CdS/TiO2) deposited on fluorine-doped tin oxide (FTO) substrate was proposed for the photoelectrocatalytic degradation of organic dyestuff. The prepared CdS/TiO2/FTO substrates with different layers of CdS deposition were characterized by scanning electron microscope (SEM), and energy dispersive X ray spectrometer (EDX). The results showed that the prepared photoanodes with higher photocatalytic activity under visible light irradiation were found due to CdS sensitization. Under optimum conditions (6-layer CdS sensitization, 2-V electric voltage, 300-W Xe lamp irradiation), the prepared 6-layer CdS/TiO2/FTO photoanodes provided higher photoelectro-catalytic activity toward methylene blue (82 % degradation within 3 hr). The experimental results show that the main reactive species is superoxide radical. Therefore, the addition of hydrogen peroxide during the degradation process can effectively accelerate the photoelectrocatalytic efficiency. Even in a real water samples, it is still less affected by the matrix and remains a considerable degree of degradation efficiency. Comparing to photodegradation and electrodegradation, the proposed photoelectrocatalytic degradation toward organic pollutants possessed advanced properties including simplicity, fast, and high degradation activity under visible light irradiation. In the future, it was considered with potential for photoelectrocatalytic degradation of organic pollutants for environmental water samples.