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以硝酸铋、钨酸钠为原料,只使用无机添加剂硫酸钠,在控制反应体系pH=1、180℃、24 h的条件下,通过水热法制备了形貌均一、分散性较好、直径约为1μm的鸟巢状钨酸铋。利用XRD、SEM、UV-Vis、BET对样品的组成、结构、形貌、能带结构、比表面积进行了表征。以氙灯为光源(用滤光片去除λ≤420 nm的光),以甲基橙(MO)、亚甲基蓝(MB)、罗丹明B(RhB)为降解对象,考察了样品对染料废水的降解活性。结果表明,硫酸钠的添加量对钨酸铋的形貌有较大影响,在硫酸钠添加量为3 g时形成的鸟巢状钨酸铋形貌较好。制备的鸟巢状钨酸铋的吸收边缘在470 nm处,比表面积为14.289 7 m2/g,在可见光下反应120 min时对甲基橙、亚甲基蓝、罗丹明B的降解率分别为5.6%、45.5%、98.2%。
Using bismuth nitrate and sodium tungstate as raw materials, the inorganic additive sodium sulfate was used only. Under the conditions of pH = 1,180 ℃ and 24 h, Bird’s nest bismuth tungstate about 1 μm. The composition, structure, morphology, energy band structure and specific surface area of the samples were characterized by XRD, SEM, UV-Vis and BET. Using xenon lamp as light source (filter with λ≤420 nm), degradation of dye wastewater by methyl orange (MO), methylene blue (MB) and rhodamine B (RhB) . The results showed that the addition of sodium sulfate had a great influence on the morphology of bismuth tungstate, and the shape of bismuth tungstate was better when the dosage of sodium sulfate was 3 g. The absorption edge of bismuth tungstate prepared at 470 nm and specific surface area of 14.289 7 m2 / g, the degradation rates of methyl orange, methylene blue and rhodamine B were 5.6% and 45.5 %, 98.2%.