CAJ | 학술논문

采用溶胶-凝胶法制备Fe、Mn掺杂的干凝胶材料(XFe和XMn),并对其催化臭氧氧化去除邻二氯苯(o-DCB)的性能进行了研究.通过X射线光电子能谱(XPS)、X射线衍射(XRD)、透射电镜(TEM)、扫描电镜(SEM)、压汞仪和氮气吸附等技术对Fe、Mn掺杂的干凝胶材料进行表征.结果表明:XFe和XMn中存在三价金属氧化物等活性物种,金属相无明显的衍射峰且金属颗粒的尺寸较小,表明金属颗粒在干凝胶载体上获得较好的分散性;相比于单独臭氧氧化时44%的o-DCB去除率,XFe和XMn的添加使得o-DCB去除率分别达到58%和72%,XFe和XMn显示了较好的催化活性;XFe和XMn的金属溶出状况不同,在水溶液中浸泡5 h后它们的金属溶出率分别为2%和8%左右.
채용용효-응효법제비Fe、Mn참잡적간응효재료(XFe화XMn),병대기최화취양양화거제린이록분(o-DCB)적성능진행료연구.통과X사선광전자능보(XPS)、X사선연사(XRD)、투사전경(TEM)、소묘전경(SEM)、압홍의화담기흡부등기술대Fe、Mn참잡적간응효재료진행표정.결과표명:XFe화XMn중존재삼개금속양화물등활성물충,금속상무명현적연사봉차금속과립적척촌교소,표명금속과립재간응효재체상획득교호적분산성;상비우단독취양양화시44%적o-DCB거제솔,XFe화XMn적첨가사득o-DCB거제솔분별체도58%화72%,XFe화XMn현시료교호적최화활성;XFe화XMn적금속용출상황불동,재수용액중침포5 h후타문적금속용출솔분별위2%화8%좌우.
Metal-doped xerogels were synthesized by the sol-gel method and their catalytic performance was evaluated for the catalytic ozonation of simulated micro-polluted water containing ortho-dichlorobenzene (o-DCB).The obtained samples were characterized by X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), X-ray diffraction (XRD), scanning electron microscopy (SEM), mercury porosimetry and nitrogen adsorption.Results show that Fe3+ oxides and Mn3+ oxides are present in the Fe-doped xerogel (XFe) and the Mn-doped xerogel (XMn), respectively. No obvious diffraction peaks corresponding to a metallic phase were present in the XRD patterns of the xerogels. Also, the metallic particles were found to be small; therefore, the metallic particles were well distributed over the xerogel supports. Catalytic ozonation experiments indicated that the removal rate of o-DCB was 44% with single ozonation, and this increased to 58% and 72% with catalytic ozonation using XFe and XMn,respectively, which suggests that metal-doped xerogels are promising catalysts for the ozonation process. We also investigated metal leaching from the metal-doped xerogel to the water solution to test the stability of the catalysts, and about 2% and 8% metal leaching for XFe and XMn was obtained within 5 h.