摘要
以硝酸铋、钨酸铵为起始原料,采用水热法合成介孔Bi_2WO_6光催化剂,借助X射线粉末衍射(XRD)、固体紫外-可见吸收光谱(UV-Vis)、电子扫描电镜(FE-SEM)和透射电镜(TEM)对催化剂的物相组成、形貌和光吸收特性进行表征,并推测三维球状介孔Bi_2WO_6的形成机理;研究溶液pH值和环境水体中常见无机离子对Bi_2WO_6光催化降解亚甲基蓝的影响。结果表明:在强酸条件下,Bi_2WO_6表现出更高的光催化活性;环境水体中的无机离子对亚甲基蓝的光催化降解影响显著,阳离子如Fe^(3+),NH^+_4以及阴离子如卤素离子对其光催化降解具有很强的促进作用,Cu^(2+)和NO^-_2几乎无影响,而Fe^(2+)对其则具有明显抑制作用。
Using bismuth nitrate and ammonium tungstate as raw materials, mesoporous bismuth tungstates （Bi2WO6） were synthesized by a facile hydrothermal process. The phase composition, structure, optical absorption properties and morphology of Bi2 WO6 photocatalyst were characterized by XRD, UV-Vis, FE-SEM and TEM, the forming mechanism of three-dimensional spherical meso porous Bi2WO6 was speculated. The effect of solution＇s pH value and common inorganic ions in tile natural water on the mesoporous BieWO6 photocatalytic activity was also studied. The experimental result of methyl-blue （MB） photocatalytie degradation show that the mesoporous Bi2WO6 exhihits better photoeatalytie activity in the strong acidic solution. Furthermore, investigation reveals thai common inorganic ions have obvious influence on the photocatalytic degradation of methyl-blue. Cat ion, such as NH＋ and Fe3＋ , and anion, such as C1 ,Br and I , can obviously promote the degrada tion of methyl-blue. Cue＋and NO2- have nearly no effect on it. While, Fe2＋ can clearly inhibit the deg radation of methyl-blue.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2016年第2期8-16,共9页
Journal of Materials Engineering
基金
教育部合成与天然产物重点实验室基金(338080055)
陕西省科技厅工业攻关项目(2013K11-08)
陕西省教育厅基金(15JS119)
延安市工业攻关项目(2011kg-13)
延安大学科研基金(2013YDZ-07
YDBK2013-11)
关键词
水热法
Bi2WO6
光催化活性
无机离子
hydrothermal method Bi2 WO6 photocatalytic activity inorganic ion
