5%Ag掺杂对MNO_(2)纳米棒和海胆微球形貌及其甲苯氧化性能的影响  

Effect of 5%Ag on the morphology and toluene oxidation of MNO_(2)nanorod and sea urchin microspheres

作　　者：鲁美娟[1] 方汉孙[1] 黄华军 李丹萍 吴玮玲 屈小路 喻成龙 LU Meijuan;FANG Hansun;HUANG Huajun;LI Danping;WU Weiling;QU Xiaolu;YU Chenglong(School of Land Resource and Environment,Jiangxi Agricultural University)

机构地区：[1]江西农业大学国土资源与环境学院

出　　处：《环境工程技术学报》2024年第4期1239-1246,共8页Journal of Environmental Engineering Technology

基　　金：国家自然科学基金项目(51508245,52160009);江西省主要学科学术和技术带头人培养计划—青年人才项目(20212BCJL23054)。

摘　　要：采用水热法制备了MNO_(2)纳米棒和海胆微球,并原位掺杂5%Ag制备了Mn-Ag复合氧化物,利用SEM、XRD、BET、Raman等表征技术对其结构进行表征,并考察不同催化剂对甲苯的去除性能。结果表明:(NH_(4))_(2)S_(2)O_(8)的掺入量会对MNO_(2)的形貌产生影响,当其掺入量为2.28 g时,形成MNO_(2)纳米棒,当其掺入量为6.84 g时,形成MNO_(2)海胆微球;MNO_(2)纳米棒掺杂5%的Ag后,形貌未发生变化,但当MNO_(2)海胆微球掺杂5%Ag时,表面的纳米线较MNO_(2)海胆微球有所增长,且出现了缠绕现象,形成了空心鸟巢状结构;5%Ag掺杂后,对MNO_(2)纳米棒和MNO_(2)海胆微球的晶型未产生影响,均为α-MNO_(2),但5%Ag-MNO_(2)纳米棒出现了Mn2O_(3)的衍射峰;MNO_(2)海胆微球较MNO_(2)纳米棒的比表面积、孔径和孔容均增大,且Ag的掺杂进一步提高了MNO_(2)海胆微球的比表面积、孔径和孔容;MNO_(2)海胆微球比MNO_(2)纳米棒具有更好的甲苯去除性能,且5%Ag掺杂后,MNO_(2)海胆微球对甲苯的去除性能达到最好。MNO_(2)nanorod and sea urchin microspheres were prepared using the hydrothermal method,and Mn-Ag composite oxides were prepared by in-situ doping with 5%Ag.The as-prepared samples were characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),BET,Raman and other characterization techniques,and the removal performance of different catalysts for toluene was investigated.It was found that the amount of(NH_(4))_(2)S_(2)O_(8) would affect MNO_(2)morphology.MNO_(2)nanorods were formed when(NH_(4))_(2)S_(2)O_(8) was 2.28 g,while MNO_(2)sea urchin microspheres were formed when(NH_(4))_(2)S_(2)O_(8) was 6.84 g.There was no morphology change of MNO_(2)nanorods after 5%Ag doping.However,the nanowires on the surface of MNO_(2)sea urchin microspheres increased when 5%Ag was doped,and the entanglement phenomenon occurred,forming a hollow bird's nest structure.After 5%Ag doping,there was no effect on the crystal of MNO_(2)nanorods and sea urchin microspheres,both of which wereα-MNO_(2),but a diffraction peak of Mn2O_(3)appeared in 5%Ag-MNO_(2)nanorods.Compared to MNO_(2)nanorods,MNO_(2)sea urchin microspheres showed an increasing trend of specific surface area,pore size and pore volume.The doping of Ag further increased the specific surface area,pore size and pore volume of MNO_(2)sea urchin microspheres.For the toluene removal,MNO_(2)sea urchin microspheres showed a better toluene removal performance than MNO_(2)nanorods,and 5%Ag-MNO_(2)sea urchin microspheres showed the best toluene removal performance among all the catalysts.

关 键 词：MNO_(2)纳米棒 MNO_(2)海胆微球 AG掺杂 形貌影响 甲苯去除 

分 类 号：X511[环境科学与工程—环境工程]