Faculty of Chemical Engineering and Technology, University of Zagreb, Marulicev trg 19, 10000, Zagreb, Croatia.
Faculty of Chemistry and Chemical Technology, University of Ljubljana, Vecna pot 113, 1000, Ljubljana, Slovenia.
Environ Sci Pollut Res Int. 2018 Jan;25(3):2538-2551. doi: 10.1007/s11356-017-0667-x. Epub 2017 Nov 10.
One of the most important features of photocatalytic materials intended to be used for water treatment is their long-term stability. The study is focused on the application of thermal and chemical treatments for the reactivation of TiO-SnS composite photocatalyst, prepared by hydrothermal synthesis and immobilized on the glass support using titania/silica binder. Such a catalytic system was applied in solar-driven treatment, solar/TiO-SnS/HO, for the purification of water contaminated with diclofenac (DCF). The effectiveness of studied reactivation methods for retaining TiO-SnS activity in consecutive cycles was evaluated on basis of DCF removal and conversion, and TOC removal and mineralization of organic content. Besides these water quality parameters, biodegradability changes in DCF aqueous solution treated by solar/TiO-SnS/HO process using simply reused (air-dried) and thermally and chemically reactivated composite photocatalyst through six consecutive cycles were monitored. It was established that both thermal and chemical reactivation retain TiO-SnS activity in the second cycle of its reuse. However, both treatments caused the alteration in the TiO-SnS morphology due to the partial transformation of visible-active SnS into non-active SnO. Such alteration, repeated through consecutive reactivation and reuse, was reflected through gradual activity loss of TiO-SnS composite in applied solar-driven water treatment.
用于水处理的光催化材料最重要的特性之一是其长期稳定性。本研究侧重于通过热和化学处理来再生 TiO-SnS 复合光催化剂的应用，该催化剂通过水热合成制备，并使用 TiO 2 /SiO 2 粘合剂固定在玻璃载体上。在太阳能驱动的处理中，即太阳能/TiO-SnS/HO 中，该催化体系被应用于净化含有双氯芬酸（DCF）的水。通过 DCF 的去除和转化、TOC 的去除和有机物质的矿化来评估所研究的再激活方法在连续循环中保留 TiO-SnS 活性的效果。除了这些水质参数外，还监测了在太阳能/TiO-SnS/HO 过程中，使用简单重复使用（风干）和热化学再激活的复合光催化剂通过六个连续循环处理后，DCF 水溶液的可生物降解性变化。结果表明，热和化学再激活都能在其第二次重复使用时保留 TiO-SnS 的活性。然而，这两种处理方法都由于可见活性 SnS 部分转化为非活性 SnO，导致 TiO-SnS 形态发生变化。通过连续的再激活和再利用，这种变化反映在应用于太阳能驱动的水处理中 TiO-SnS 复合催化剂的活性逐渐丧失。
