State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Institute of Biochemical Engineering & Environmental Technology, Lanzhou University, Lanzhou 730000, PR China.
Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, PR China.
Int J Biol Macromol. 2024 Nov;279(Pt 1):134872. doi: 10.1016/j.ijbiomac.2024.134872. Epub 2024 Aug 20.
Methylene blue (MB) is a refractory organic pollutant that poses a potential threat to the aquatic environment. Fenton reaction is considered a primrose strategy to treat MB. However, the traditional Fenton process is plagued by narrow pH application range, poor stability, and secondary pollution. To solve these problems, many Fenton-like catalysts including metal-organic frameworks (MOFs) have been prepared. Herein, a novel bimetallic MOF (Fe/Ce-BDC@CS) was prepared through simple adsorption for the effective removal of MB, where chitosan (CS) was used as the carrier. The degradation performance of Fe/Ce-BDC@CS (100 % within 20 min) was better than that of most reported monometallic MOFs. Moreover, Fe/Ce-BDC@CS exhibited good repeatability and its anti-interference performance of some inorganic ions was also remarkable. Column loading experiments showed that the removal efficiency of MB was still about 50 % over 155 h with a flowing speed of 0.30 L/h. Comparative analysis indicated that such excellent performances could be attributed to the synergistic effect between Fe and Ce. Furthermore, the results of quenching tests indicate that OH, O, and O contributed to MB degradation. In brief, Fe/Ce-BDC@CS has promising prospects in MB treatment, which can provide scientific references for the design and application of bimetallic MOFs.
亚甲蓝（MB）是一种难处理的有机污染物，对水生环境构成潜在威胁。芬顿反应被认为是处理 MB 的一种有前途的策略。然而，传统的芬顿工艺存在 pH 应用范围窄、稳定性差和二次污染等问题。为了解决这些问题，已经制备了许多类芬顿催化剂，包括金属有机骨架（MOFs）。本文通过简单吸附制备了一种新型双金属 MOF（Fe/Ce-BDC@CS），用于有效去除 MB，其中壳聚糖（CS）用作载体。Fe/Ce-BDC@CS 的降解性能（20 min 内达到 100%）优于大多数报道的单金属 MOFs。此外，Fe/Ce-BDC@CS 表现出良好的重复性，对一些无机离子的抗干扰性能也很显著。柱加载实验表明，在流速为 0.30 L/h 时，MB 的去除效率仍在 155 h 内保持在 50%左右。对比分析表明，这种优异的性能可归因于 Fe 和 Ce 之间的协同作用。此外，猝灭实验结果表明，OH、O 和 O 对 MB 的降解有贡献。总之，Fe/Ce-BDC@CS 在 MB 处理方面具有广阔的应用前景，可为双金属 MOFs 的设计和应用提供科学参考。
