摘要
针对TNT炸药废水具有成分复杂、排放量大、有毒等特点,立足于炸药废水在排放前的降解处理,研究开发一种基于核壳结构Fe3O4@SiO2/TiO2纳米颗粒的高效、可控回收、无二次污染且成本低的光催化降解方法。利用高温碳还原法和溶胶凝胶法制备了具有核壳结构的Fe3O4@SiO2/TiO2纳米颗粒。XRD分析表明,内核Fe3O4呈现磁铁矿特征,表面覆盖的纳米TiO2为锐钛矿型。磁滞回线测试结果显示,复合颗粒的饱和磁化强度为46.5 emu/g,N2吸附-解吸分析结果表明,该颗粒具有典型的介孔结构。使用Fe3O4@SiO2/TiO2纳米颗粒在紫外光下对含TNT废水进行降解,降解率达到81.9%,且颗粒的回收率达到88.4%,为实现高效、可控回收、无二次污染光催化-吸附降解TNT奠定了基础。
Aimed at the complicated composition,high emission and poison of the TNT wastewater,a degradation method based on efficient and recoverable Fe3O4@ SiO2/TiO2nanoparticles through UV photocatalysis was reported. The Fe3O4@ SiO2/TiO2nanoparticles were obtained through high temperature carbon reduction method and gel-sol method. The results of XRD,TEM and magnetic characterizations showed that the magnetic cores were magnetite and the functional layer was anatase with the saturation magnetization of the overall nanoparticles was 46. 5 emu/g. The morporous structure was demonstrated by the N2adsorption-desorption analysis results. Fe3O4@ SiO2/TiO2nanoparticles were utilized on degradating 20 mg/L TNT waste solution under ultraviolet light. The degradation rate was 81. 9% after 3 hours,and the recovery rate of Fe3O4@ SiO2/TiO2nanoparticles was 88. 4%. The preparation of Fe3O4@ SiO2/TiO2nanoparticles laid a solid foundation of degradating TNT in photocatalytic method with high efficiency and controllable recovery but no secondary pollution.
出处
《环境工程学报》
CAS
CSCD
北大核心
2014年第6期2413-2416,共4页
Chinese Journal of Environmental Engineering
基金
山西省归国留学人员基金(2008062)
山西省青年基金(2011021020-2)
关键词
核壳结构
吸附
光催化
TNT
core-shell structure
absorption
photocatalysis
TNT
