纳米氧化钨的制备及光降解染料研究

Preparation of Nano Tungsten Oxide and Application as Photocatalytic Degradation for Dye

以仲钨酸铵为钨源,碳纳米管(CNTs)经600℃空气气氛和氮气气氛煅烧分别得到氧化钨(WO_3)(无CNTs)和WO_3/CNTs。在其他制备参数相同条件下,无模板制备了钨酸(H_2WO_4),经600℃空气气氛煅烧得到WO_3(空白)。分别以亚甲基蓝、甲基橙、酸性橙为染料,在500 W汞灯照射下,考察各样品对0.02 g/L染料的光催化降解能力,摸索了不同样品对染料光催化性能的影响规律。结果表明:经90 min光照,双氧水协助样品对亚甲基蓝溶液的降解率(99.9%)比未加双氧水(65.17%)亚甲基蓝溶液的降解率更高,且高于甲基橙溶液(35.1%)和酸性橙溶液(4.23%);WO_3/CNTs对3种染料的光催化效果明显优于WO_3(无CNTs)和WO_3(空白)。

H2WO4/CNTs powders were prepared by liquid phase method using ammonium paratungstate (APT) as tungsten source and carbon nanotubes (CNTs) as template.WO3 (without CNTs) and WO3/CNTs were obtained by calcinating H2WO4/CNTs at 600℃ at air atmosphere and nitrogen atmosphere respectively.The WO3 (blank) was prepared by H2WO4 under the same conditions without using template.The photocatalytic degradation ability of each sample for 0.02 g/L dyes of methylene blue,methyl orange,and acid orange was investigated under 500 W mercury lamp irradiation,and the effects of different samples on their photocatalytic properties were explored.The results showed that the degradation rate (99.9%) of the methylene blue solution was higher than that of the unoxygenated water (65.17%) without the help of hydrogen peroxide after 90 min illumination.The degradation of WO3/CNTs assistedby hydrogen peroxide on methylene bluesolution(99.9%)ishigherthanthat of methyl orange solution (35.1%) and acid orange solution (4.23%).The photocatalytic effects of WO3/CNTs on methylene blue,methyl orange,and acid orange were significantly better than those of WO3(without CNTs) and WO3(blank).