焙烧改性对含锌电炉尘可见光光-芬顿催化性能的影响  

Effect of roasting modification on visible light photo-Fenton catalytic performance of zinc-containing electric furnace dust

作　　者：周芮 黄时雨 刘伟明[2] 吴照金[1,2] Rui ZHOU;Shiyu HUANG;Weiming LIU;Zhaojin WU(Key Laboratory of Metallurgical Emission Reduction&Resources Recycling,Ministry of Education,Anhui University of Technology,Ma'anshan,Anhui 243002,China;Anhui Key Laboratory of Metallurgical Engineering&Resources Recycling,Anhui University of Technology,Ma'anshan,Anhui 243002,China)

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,安徽马鞍山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,安徽马鞍山243002

出　　处：《过程工程学报》2024年第11期1274-1283,共10页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:U1660105)。

摘　　要：对马钢现场采集的含锌电炉尘进行焙烧改性,以酸性橙Ⅱ(AOⅡ)为模型污染物评估焙烧对其可见光光-芬顿催化活性的影响。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和光电化学工作站等对含锌电炉尘的物相结构、微观形貌和光电化学性能进行表征分析,并讨论了相关机制。结果表明,含锌电炉尘具有良好的可见光催化活性,焙烧对其组织结构、载流子浓度及分离和输运行为影响显著,从而影响其光-芬顿催化性能。260℃焙烧使含锌电炉尘的载流子浓度提高1.66倍,且具有最佳的载流子分离和输运性能,其对AOII的2,4和6h降解率较未焙烧样分别增加47.6%,11.1%和7.4%,6h降解率高达94.2%。提高焙烧温度至510和650℃,含锌电炉尘中ZnO和部分Fe_(3)O_(4)转为ZnFe_(2)O_(4),导致颗粒粗化并削弱其光催化性能。温和焙烧的含锌电炉尘可作为低成本、高可见光活性的光-芬顿催化材料,在治理工业废水中有机污染物领域具有应用潜力,对冶金固废高附加值利用和环境可持续发展具有积极意义。Zinc containing electric arc furnace dust(EAFD)is a hazardous solid waste generated during the electric arc furnaces steelmaking process,which contains a large amount of zinc and ironoxides.Systematically studying itsphotocatalytic performance is of great significance for its high value-added utilization.Herein,the EAFD collected from Masteel is treated by roasting modification,and the effect of roasting on its visible light photo-Fenton catalytic activity is evaluated using acid orangeⅡ(AOⅡ)as a model pollutant.The phase structure,microtexture,and photoelectrochemical properties of EAFD are analyzed using X-ray diffraction(XRD),scanning electron microscopy(SEM),and photoelectrochemical workstation,and the relevant mechanisms are discussed.The results indicate that EAFD has good visible light catalytic activity,and calcination has a significant impact on its phase components,carrier concentration,separation and transport behavior of photo generated electrons/holes,thereby regulating its photo-Fenton catalytic performance.Calcination at 260℃ can effectively remove inert attachments on the surface of particles without changing their main phase composition,exposing more active sites on the surfaces of catalytic active phases Fe_(3)O_(4),ZnFe_(2)O_(4),and ZnO.Compared to the uncalcined EAFD sample,the carrier concentration has increased by 1.66 times,and it possesses the lower electrochemical impedance and better photogenerated electron/hole separation efficiency.Compared with the uncalcined sample,its degradation rates for AOⅡat 2,4,and 6 h increase by 47.6%,11.1%,and 7.4%,respectively,with a degradation rate of 94.2%after 6 h.Further increasing the calcination temperature to 510 and 650℃,the degradation rates of AOⅡover the calcined EAFD samples decrease to 87.8% and 63.8% within 6 hours respectively,being attributed to the transformation of ZnO and some Fe_(3)O_(4) in EAFD into ZnFe_(2)O_(4) and particle coarsening above 510℃.Mildly roasted zinc containing electric arc furnace dust can be used as a l

关 键 词：电炉尘 固体废弃物 光电化学 光催化 光-芬顿 酸性橙Ⅱ(AOⅡ) 

分 类 号：X75[环境科学与工程—环境工程] O643.36[理学—物理化学]