NiO掺杂InVO_4光催化降解甲酸水溶液产氢的研究

Photocatalytic hydrogen production by degradation of formic acid aqueous solution over NiO doped InVO_4 photocatalyst

以有机污染物为电子供体可达到制氢与治污的双重目标。通过高温固相法制备了新型NiO/InVO4复合光催化剂。采用XRD,SEM,UV-VIS,BET等测试手段对复合光催化剂的物理和光学性质进行了表征,考察了NiO/InVO4复合光催化剂降解甲酸水溶液制氢的光催化反应。结果表明:NiO/InVO4复合光催化剂为正交晶相结构,主要由微米级的球形颗粒组成,比表面积为1.63 m2/g,与纯InVO4样品相比,NiO/InVO4复合光催化剂的可见光吸收能力增强。优化了NiO/InVO4复合光催化剂降解甲酸溶液制氢反应中的甲酸体积分数、pH值等反应参数,分析了其产氢机理。

The hydrogen production and wastewater treatment can be achieved synchronously when organic pollutants as electron donor were used in the hydrogen production process. The novel NiO/InVO4 composite photocatalysts were synthesized by solid-phase reaction at high temperature. The physical and optical properties of the composite photocatalysts were characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM）, ultraviolet-visible spectroscopy （ UV-VIS ） and Brunauer-Emmett-Teller （BET）. The photocatalytic performance of the NiO/InVO4 samples was evaluated by photocatalytic hydrogen production via degradation of formic acid aqueous solutions. The results indicate that the NiO/InVO4 photocatalysts are orthogonal phase and consist of spherical micron-sized particles. The specific surface area of samples is 1.63 m2/g. Compared with the pure InVO4 photocataysts, the composite samples show a superior absorption capacity for the visible light. Moreover, the reaction parameters of photocatalytic hydrogen production by degradation of formic acid aqueous solutions, such as formic acid volume fraction and pH value etc, were optimized. The mechanism of hydrogen production reaction was discussed.