FeTiO_(3)@TiO_(2)/C纳米复合材料的合成及其PMS辅助光催化降解性能  

Synthesis of FeTiO_(3)@TiO_(2)/C nanocomposites and the enhanced visible light catalytic degradation properties promoted by PMS

作　　者：朱建华[1,2] 王瑞 王晨 李梦迪 周慧 ZHU Jianhua;WANG Rui;WANG Chen;LI Mengdi;ZHOU Hui(Key Laboratory of Metallurgical Emission Reduction&Resources Recycling,Ministry of Education,Anhui University of Technology,Ma′anshan 243002;Anhui Province Key Laboratory of Metallurgical Engineering and Resources Recycling,Anhui University of Technology,Ma′anshan 243002)

机构地区：[1]安徽工业大学冶金减排与资源综合利用教育部重点实验室,马鞍山243002 [2]安徽工业大学冶金工程与资源综合利用安徽省重点实验室,马鞍山243002

出　　处：《环境科学学报》2023年第3期65-76,共12页Acta Scientiae Circumstantiae

基　　金：2020年度安徽高校自然科学研究项目(No.KJ2020A0256);安徽省高校协同创新项目(No.GXXT-2020-072)。

摘　　要：以Fe(2-MI)@NH_(2)-MIL-125(Ti)为前驱物制备了三元FeTiO_(3)@TiO_(2)/C异质结构复合材料,发现其具有丰富的N掺杂的石墨烯缺陷,在可见光范围内显示出良好的光吸收能力.FeTiO_(3)和TiO_(2)在碳骨架上有效耦合,可显著提高催化活性.实验结果表明,制备的催化剂能有效活化PMS;在自然光/PMS体系中,30 min内降解罗丹明B的效率可达99%,优于已报到的同类催化剂;催化剂在pH为3~9范围内去除有机物的效率均达到90%以上,且矿化效率达到50%以上.EPR和自由基淬灭实验显示,空穴和·OH对催化过程起到关键作用,空穴/光电子和活性金属中心Fe(Ⅲ)/Fe(Ⅱ)氧化还原对自由基和后期有机物降解也起到重要作用.Ternary FeTiO_(3)@TiO_(2)/C heterojunction nanocomposites were prepared by using Fe(2-MI)@NH_(2)-MIL-125(Ti)as the precursor,which contain abundant N-doped graphene defects.The coupling of FeTiO_(3) with TiO_(2) on the carbon skeleton can enhance the harvesting capability of the visible light and improve the catalytic activity significantly.Experiments have revealed that the prepared catalyst can activate PMS effectively.Within 30 mins,the degradation efficiency of Rhodamine B can reach to 99%in visible light/PMS systems,which is much higher than those of similar reported catalysts.Meanwhile,the removal rate can reach more than 90%in a wide pH range from 3 to 9 with high mineralization efficiency above 50%.EPR and radical quenching experiments have confirmed that holes and ·OH played predominate roles during the catalytic process.The visible light excited electrons/holes pairs and the redox recycling of Fe(Ⅲ)/Fe(Ⅱ) also contribute to the degradation of the organic pollutant.

关 键 词：FeTiO_(3)@/TiO_(2)/C 三元复合材料 PMS/光催化降解 罗丹明B 

分 类 号：X703[环境科学与工程—环境工程] TH3[机械工程—机械制造及自动化]