Abstract: 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 iron oxides. Systematically studying its photocatalytic 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 orange II (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 Fe3O4, ZnFe2O4, 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 photo-generated electron/hole separation efficiency. Compared with the uncalcined sample, its degradation rates for AOII at 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 AOII over the calcined EAFD samples decrease to 87.8% and 63.8% within 6 hours respectively, being attributed to the transformation of ZnO and some Fe3O4 in EAFD into ZnFe2O4 and particle coarsening above 510℃. Mildly roasted zinc containing electric arc furnace dust can be used as a low-cost, high visible light activity photocatalytic material, with potential applications in the treatment of organic pollutants in industrial wastewater. It has positive significance for the high value-added utilization of metallurgical solid waste and sustainable environmental development.

Key words: electric arc furnace dust (EAFD), solid waste, photoelectrochemistry, photocatalysis, photo-Fenton

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6 h降解率较未焙烧样分别增加47.6%, 11.1%和7.4%，6 h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Fe3O4转为ZnFe2O4，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。

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)