The risks of selenium (Se) water contamination to human and aquatic life make it important to develop and apply efficient Se removal methods. Selenium photocatalytic reduction is an effective technique for this purpose, but it still suffers from limitations related to the photocatalyst recovery at the end of the process. In the present work, magnetic particles were coated with a titanium dioxide (TiO₂) layer, using a sol–gel process, in order to obtain a magnetic recoverable Fe/TiO₂ photocatalysts. The catalysts were prepared with different Fe concentrations and with or without thermal treatment, being then characterized by different techniques and applied in the Se photoreduction. Both calcined and non-calcined catalysts presented similar specific surface areas (19–29 m² g^− 1), but the latter showed better results in the photocatalytic tests (100% of Se removal in 15 min using the non-calcined 8% Fe photocatalyst). The photostability test performed using the best catalyst (non-calcined 8% Fe photocatalyst) indicated a decrease in the photoactivity from the second photocatalytic cycle onwards. Besides, the catalysts lost their magnetic properties after being calcined.

硒（Se）水污染对人类和水生生物的风险使开发和应用有效的Se去除方法变得很重要。硒光催化还原是用于此目的的有效技术，但是在该过程结束时仍遭受与光催化剂回收相关的限制。在目前的工作中，使用溶胶-凝胶工艺在磁性颗粒上涂覆了二氧化钛（TiO ₂）层，以获得可磁性回收的Fe / TiO ₂光催化剂。制备了具有不同铁浓度且经过或未经过热处理的催化剂，然后通过不同技术对其进行表征，并应用于硒的光还原中。煅烧和未煅烧的催化剂都具有相似的比表面积（19–29 m ² g ^-1），但后者在光催化测试中显示出更好的结果（使用未经煅烧的8％Fe光催化剂在15分钟内100％去除Se）。使用最佳催化剂（未煅烧的8％Fe光催化剂）进行的光稳定性测试表明，从第二次光催化循环开始，光活性降低。此外，催化剂在煅烧后失去了磁性。