Synthesis And Photocatalysis Research Of Narrow Band Gap Semiconductors Bi₂MoO₆, CuWO₄

A major challenge for human being in the21st century is the worldwide environmental pollution and destruction. Conventional water treatment technology can not deal well with the organic pollutions that are not easy to degrade. Hydroxyl radical with strong oxidbillity induced by the photocatalysis can degrade most of the poisonous organic pollutions efficiently. The semiconductor photocatalytic technology will become one of the important means to cope with environmental problems.Conventional semiconductor photocatalyst Ti?O2with band gap at3.2eV can only response in UV range, which takes up5%of the solar energy. To enhance the utilization of solar energy and the efficiency of photocatalysis, it’s important and necessary to develop new photocatalysis materials that can response in the visible-light range. This paper reported two oxide of γ-Bi2MoP6and CuWO4, the main contents was included as follows:1. The pure phase γ-Bi2MoO6nanoflakes with a diameter in16-30nm and thickness about5nm were obtained by the solvothermal method in variation acidic conditions at160℃for9h in which EG (ethylene glycol) was used as solvent and SDBS as surfactant. The optimum process conditions were SDBS1.0g,40mL absolute ethyl alcohol and40mL EG,160γ and9h. The obtained samples were characterized by XRD, SEM, TEM, UV-vis spectroscopy. The photocatalytic activities were evaluated by the degradation of Rhodamine B, about84%Rhodamine B was mineralized within3h. The photocurrent was taken to characterize the ability to generate and transfer photogenerated charge carriers of semiconductor. The relationships between reaction conditions, morphology and photocatalytic abilities were investigated.2. The pure phase CuWO4was synthesized by simple sol-gel method. XRD, SEM, UV-vis were taken to characterize the phases and structures, morphology, optical properties and band gap of obtained samples. The photocatalytic activity of obtained samples was evaluated by the degradation process of Methylene Blue (MB). To get the pure phase CUWO4, it was critical to wash the dried gel before calcination. The microstructure and morphology had great impact on the photocatalytic abilities. The obtained samples had excellent adsorptive abilities and photocatalytic abilities. After the adsorption-desorption equilibrium,33%MB was adsorbed and82%MB was photodegraded within4h.