Recyclable Ag@AgBr-gelatin film with superior visible-light photocatalytic activity for organic degradation
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Recyclable Ag@AgBr-gelatin film was fabricated by a versatile route, i.e., embedding Ag@AgBr grains into gelatin matrix, constructing 3D network structures via the cross-linking reaction between gelatin and cross-linking agent 1,3-bis(vinylsulfonyl) propanol, and forming Ag@AgBr-gelatin film on the nylon mesh. The microstructures and chemical compositions of the obtained films were analyzed by the means of scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, thermo gravimetry/differential thermal analyzer, and Fourier transform infrared spectroscopy. It was revealed that the 3D network structure was formed via the cross-linking reaction between gelatin and cross-linking agent 1,3-bis(vinylsulfonyl) propanol (BVP). Photocatalytic degradation of methyl orange indicated that Ag@AgBr-gelatin film exhibited excellent visible-light photocatalytic activity and recyclability, due to the reason that the 3D networks can efficiently fix Ag@AgBr but hardly hinder the transmissions of reactants and degradation products. The adhesion fastness of Ag@AgBr-gelatin film on nylon mesh enhances with increasing the dosage of cross-linking agent BVP, and the lower limit of BVP dosage for forming unbroken film is 0.02 g/m2. Excessive cross-linking would make gelatin network structure too denser, resulting in the decline of photocatalytic activity.
KeywordsAg@AgBr Gelatin film Recycle Surface plasmon resonance Photocatalytic activity
This work has been supported by the National Natural Science Foundation of China (21277046, 21047002, 21173077), the Shanghai Committee of Science and Technology (13NM1401000), the Shanghai Natural Science Foundation (10ZR1407400), the National Basic Research Program of China (973 Program, 2010CB732306), and the Project of International Cooperation of the Ministry of Science and Technology of China (2011DFA50530). Open Project from Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control of Nanjing University of Information Science and Technology, Jiangsu Province Innovation Platform for Superiority Subject of Environmental Science and Engineering (KHK1211).
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