School of Materials Science and Engineering, Beihang University, Beijing, 100191, China; Intl. Research Centre for Advanced Structural and Bio-Materials, Beihang University, Beijing, 100191, China; Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
Environ Pollut. 2019 May;248:229-237. doi: 10.1016/j.envpol.2019.01.018. Epub 2019 Jan 29.
A novel self-assembly method was developed to prepare a γ-FeO/graphene oxide (GO) heterogeneous catalyst that showed excellent synergy between photocatalysis and Fenton-like reactions. The γ-FeO/GO catalyst prepared on the iron plates demonstrated efficient and reproducible catalytic activities for water treatment. It takes only 80 min to degrade 50 mg L methylene (MB) completely, which is the main non-biodegradable dye in wastewater from the textile industry. The heterogeneous catalyst is stable over a wide range of pH (from 2.0 to 10.2) for MB degradation, and can be easily extracted from solution and repeatedly used with little loss of catalytic activity. The high activity and stability of the catalyst system can be attributed to charge separation between γ-FeO and GO, which could accelerate Fenton-like process and photocatalysis. In addition, the dominant reactive oxidant species responsible for the MB degradation, including the hydroxyl radicals (•OH) and holes (h), were trapped on the surface of the γ-FeO/GO composite, as proved by a free-radical quenching experiment. The γ-FeO/GO heterogeneous catalyst could potentially provide a solution for removal of non-biodegradable dyes from wastewater in the textile industry.
一种新的自组装方法被开发出来，用于制备γ-FeO/氧化石墨烯（GO）异质催化剂，该催化剂在光催化和类 Fenton 反应之间表现出优异的协同作用。在铁板上制备的 γ-FeO/GO 催化剂在水处理方面表现出高效且可重复的催化活性。它只需 80 分钟即可完全降解 50mg/L 的亚甲基蓝（MB），MB 是纺织工业废水中主要的难生物降解染料。该非均相催化剂在广泛的 pH 值范围内（从 2.0 到 10.2）对 MB 降解都很稳定，并且可以很容易地从溶液中提取并重复使用，而催化活性损失很小。该催化剂体系的高活性和稳定性归因于 γ-FeO 和 GO 之间的电荷分离，这可以加速类 Fenton 过程和光催化。此外，通过自由基猝灭实验证明，负责 MB 降解的主要活性氧物种，包括羟基自由基（•OH）和空穴（h），在 γ-FeO/GO 复合材料表面被捕获。γ-FeO/GO 异质催化剂可能为去除纺织工业废水中的难生物降解染料提供了一种解决方案。
