Preparation Of Polymer-Inorganic Semiconductor Composites And Their Photocatalytic Performance

Environmental pollution and energy shortage are two of the main point of the current social attention, photocatalystic technology and the use of some clean energy such as solar energy can effectively solve the energy shortage and environment problem. Thus, the exploration of semiconductor materials with excellent photocatalystic property has been a focus of photocatalytic fields. In recent years, researcher have paid more focused on the materials with environmental protection performance, which mainly synthesize some environment friendly catalyst, the large of research have been paid attention to combining non-toxic natural high-polymer with semiconductor photo catalysts. In this paper, our works are devoted to modificating titanium dioxide, zinc oxide with protein and porphyrin for the preparation photocatalyst and discussing photocatalytic property of the preparation materials. The mainly specific research contents are as followers:1、The photocatalyst flower-like ZnO and ZnO/BSA by grinding and bath method, and were characterized by XRD、SEM、TEM、FT-IR. The photocatalytic activities of sample were evaluated by depredating of the selected methylene blue and phenol dye under UV light irradiation, and discussing the photocatalytic reaction mechanism. The experimental results showed that ZnO/BSA composite has bigger specific surface area、lower fluorescence intensity and higher photocurrent density through BET、PL and photo current testing, which indicate the composites can effectively suppress the recombination rate compared with ZnO catalyst. The experimental result showed that about 78% of MB could be degraded by ZnO, while more than 98% of MB had been degraded by ZnO/BSA, respectively. As for phenol, the photocatalytic efficiency of ZnO/BSA could be reached merely 92%, which was higher than that 72% of ZnO. Thus, organic dye could be efficiently degraded by ZnO/BSA photocatalyst under UV light irradiation. During photocatalytic reaction process, BSA, as a high polymer of animal, was applied to modify ZnO, which has similarity effect with organic dyes, and absorbed more dyes to surface of photocatalyst to improve photodegradation.2、Soy isolate protein（SPI）,as a natural high polymer plant protein, modified semiconductor TiO₂ to form SPI@TiO₂ composites photocatalyst, we have tested their electrochemical performance through a series of characterization methods, such as XRD、DRS、BET、PL, prepared composite materials with different protein content and discussed optimal protein content, In addition, a possible reaction mechanism of the photocatalyst SPI@TiO₂ has been put forward。The experiment results showed that SPI@TiO₂ photocatalyst have lower fluorescence intensity and higher photocurrent density compared with TiO₂ photocatalyst. When added 0.02 g protein into TiO₂ form SPI@TiO₂ composite, it has the best photodegradate performance, when contained 0.06 g protein, the composite’ photodegradate performance become reduced, which could due to large protein gathered surface to hider UV light.3、The different morphology（flower-like, global, ellipsoid shape）of TiO₂ were synthesized via a facile hydrothermal method, ZnTmMpHPP as photosensitizer modified different morphology TiO₂ to form TiO₂/ZnTmMpHPP composites, Besides, we have characteried the sample by XRD、BET、FT-IR、DRS testing method, and investigated electrochemical performance、property of hydrogen production from water. The experiment result indicated that TiO₂/ZnTmMpHPP composites have a higher photocurrent density、lower photo electron recombination rate and higher hydrogen production compared with TiO₂ photocatalyst.All in all, combining natural polymer protein with inorganic semiconductor materials is beneficial to photocatalytic degradation of organic dyes, porphyrin of photosensitive agent and inorganic semiconductor titanium dioxide composites showed drastically improved photocatalytic activity for water decomposition.