A kind of polystyrene/bismuth oxyiodide/titanium dioxide composite photocatalyst and preparation method thereof
A technology of bismuth oxyiodide and polystyrene, applied in the field of photocatalyst and its preparation, to avoid secondary pollution, facilitate multiple cycle degradation of dyes, and improve separation efficiency
Active Publication Date: 2019-09-17
SUZHOU UNIV
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Problems solved by technology
[0004] However, most of the experiments on photocatalytic degradation of simulated dyes are carried out in airtight glass bottles. In addition to considering the improvement of the degradation rate of photocatalysts, the problem of recovering samples dispersed in the solution after the experiment also needs to be resolved.
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Embodiment 1
[0028] Preparation of polystyrene pellets: Add 0.3 g of polyvinyl alcohol, 0.01 g of polyvinylpyrrolidone and 100 ml of deionized water into a three-necked flask equipped with mechanical stirring, condenser and air guide tube respectively, and start stirring And feed nitrogen for 20 minutes, mix 5 g of styrene, 5 g of divinylbenzene, 0.05 g of dibenzoyl peroxide, 7 g of n-heptane and 1.25 g of acrylic acid into the above system, and keep the nitrogen atmosphere, The stirring speed was adjusted to 400 rpm for 15 minutes of pretreatment, then the temperature was raised to 70 °C, and the reaction was carried out for 24 hours. After the reaction is finished, the reaction solution is filtered, and the obtained microspheres are repeatedly washed with hot water at 70° C. until the filtrate is clear, and then dried to prepare polystyrene beads. In this example, polystyrene was modified with acrylic acid to form carboxylated polystyrene.
[0029] See attached figure 2 Figures (a) an...
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Abstract
The invention discloses a polystyrene / bismuth iodide oxide / titanium dioxide composite photocatalyst and a preparation method thereof. Polystyrene pellets are used as carriers, and bismuth iodide oxide is attached to the polystyrene pellets by the first hydrothermal method. surface; after the polystyrene / bismuth oxyiodide balls are dried, the second step of hydrothermal method is used to realize the adhesion of titanium dioxide on the surface of the polystyrene / bismuth oxyiodide balls to obtain polystyrene / bismuth oxyiodide / TiO2 composite photocatalyst. The polystyrene / bismuth oxyiodide / titanium dioxide composite photocatalyst prepared by the invention has good crystallization degree and good repeatability, and has a certain degree of absorption in the ultraviolet-visible light region, and the composite photocatalyst not only enhances the photocatalysis of bismuth oxyiodide performance, and solve the problem that titanium dioxide is limited to the application of ultraviolet photocatalysis and the powder is difficult to recover in solution, which is convenient for recycling.
Description
technical field [0001] The invention relates to a photocatalyst and a preparation method thereof, in particular to a two-step hydrothermal reaction method in which polystyrene pellets are used as a carrier and bismuth oxyiodide and titanium dioxide are sequentially attached to the surface, belonging to the technical field of composite material photocatalysis. Background technique [0002] With the rapid development of the economy and the continuous growth of the population, the problems of global environmental pollution and increasing demand for energy supply have become increasingly prominent. According to statistics, factories discharge about 30 to 40 billion tons of pollutants into global waters every year, including sewage containing excessive heavy metals, toxic solvents and other wastes, causing serious environmental pollution. Sustainable development has become the path that modern society must choose . On the one hand, as a renewable energy source, solar energy has ...
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IPC IPC(8): B01J31/38B01J35/08B01J37/10C02F1/30C02F101/30
CPCC02F1/30B01J31/38B01J37/10C02F2101/308B01J35/51B01J35/39Y02W10/37
Inventor 秦传香陆楚楚鲍志敏郭晓飞
Owner SUZHOU UNIV