Preparation of Fe-TiO2 from recycling hand warmer and its applicability on photocatalytic degradation of dye Acid Red 27 under visible light

• Main Authors: Shih-Han Chang, 章詩函
• Other Authors: Yung-Hsu Hsieh
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/23331245620742528526

碩士 === 國立中興大學 === 環境工程學系所 === 103 === In this study, preparation of Fe-TiO2 was synthesized by sol-gel method using tetraisopropoxide (TTIP) and the iron of hand warmer as precursors. The manipulation parameters including different calcination temperatures(500 °C,600 °C and 700 °C), Fe:Ti molar ratios (0.05 %, 0.1 %, 0.25 % 0.5 % and 1 %), the pH value (3, 5.5, 9) and concentration of AR27 (10 mg/L, 20 mg/L, 30 mg/L) were evaluated by photodegradation of Acid Red 27 under visible light. Reusability of the catalyst was investigated by the optimal operating parameters. Desorption experiments were conducted to understand the photodegradation efficiency of catalyst under visibe light. Characterization of prepared catalysts by FE-SEM, HR-XRD, BET, ESCA, Zeta potential, UV-Vis was investigated. Fe:Ti molar ratio 0.1 mole% calcined at 500 °C showed strip shape with high surface area .Crystal structure exhibited anatase phase and pHzpc was 5.6. The ESCA provided evidence for Fe3+ surface species in the Fe-TiO2. There were the same trend between actual proportion of iron-doped and theoretical values. The band gap decreased as the amount of iron increased and shifted the absorbance edge to the visible light region. The results demonstrated that the best photodegradation efficiency was 0.1 mole% Fe-TiO2 calcined at 500 °C under the conditon of 10 mg/L dye concentation at pH 3. The color removal efficiency kept 89 % after catalyst used for 4 times. It was proved accroding to the prvious and desorption experiment results that preparation of Fe-TiO2 from recyled hand warmer showed great decolorization efficiency for AR27 under visibe light.