摘要
以硝酸铋和硝酸银为主要原料,采用水解法制备了可见光响应型高效复合催化剂Bi6O26N5H9/AgCl。利用X射线仪(XRD)、扫描电镜(SEM)等手段对样品进行表征,并以碱性染料罗丹明B为目标污染物,金属卤化物灯为可见光光源测试其光催化性能,研究了初始Bi 3+/Ag+物质的量比、废水pH及浓度等对Bi6O26N5H9/AgCl光催化活性的影响,并对光催化过程中产生的活性物种进行了检测。结果表明,当罗丹明B的质量浓度为20 mg/L、AgCl/Bi6O26N5H9催化剂用量为0.5g/L、pH=4.6、光照30min条件下,罗丹明B脱色率、COD和TOC去除率分别为98.73%、88%和69%。活性物种的检测表明光催化过程产生的主要活性物种为·OH自由基,而非空穴和超氧阴离子。
A novel Bi6O26N5H9/AgCl composite photocatalyst was prepared by simple hydrolytic method and characterized with SEM and XRD.The photocatalytic properties were studied by use of RhB as simulated wastewater to degrade and a metallic halide lamp as a visible light source.The effects of different Bi^3＋/Ag^＋molar ratios,initial pH and concentration of wastewater on the activity of visible light catalyst were studied,and the active species released during reaction process were detected with EDTA,NBT and Fe（phen）32＋.The results show that the decolorization rate,COD and TOC removal rate of RhB solution are respective 98.73%,88%and 69% under the condition of the initial RhB concentration of 20mg/L,photocatalyst dosage of 0.5g/L,solution initial pH of 4.6and irradiation of 30 min.Furthermore,the main active species released during the photocatalytic degradation process are not holes and superoxide anion,but are hydroxyl radicals.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2015年第20期8-12,共5页
Materials Reports
基金
广西高等学校科研基金(YB2014049)
国家自然科学基金(51469006)
