Song Rutong, Yao Jun, Yang Mei, Ye Zhongbin
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China.
College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China.
Langmuir. 2022 Aug 2;38(30):9400-9409. doi: 10.1021/acs.langmuir.2c01354. Epub 2022 Jul 21.
Metal-organic frameworks (MOFs), especially Fe-MOFs, have shown prospective application in eliminating organic dyes from wastewater due to their well-developed pores, water stability, easy preparation, and economy. Herein, we synthesized four types of Fe-MOFs (such as MIL-88A, MIL-88B, MIL-100, and MIL-101) using the hydrothermal method. The products were analyzed with several methods. By comparing the adsorption effect of those four types of Fe-MOFs on three kinds of dyes, it has been shown that MIL-100 owns the best adsorption efficiency on cationic organic dyes methylene blue (MB) and Rhodamine B (RhB) in 180 min, while all MOFs have slight removal capacity on methyl orange (MO). MIL-100, as an adsorbent, was studied under various research conditions, and the maximum removal efficiencies to MB, RhB, and MO were found to be up to 97.36%, 88.75%, and 13.00%, respectively. Furthermore, cationic dye MB's removal by MIL-100 was fitted with a pseudo-second-order model and Langmuir isotherm model ( = 411.041 mg/g) by adsorption kinetics and isotherms research, and MIL-100 could rapidly and selectively divide MB from a binary complex aqueous solution of MB and MO. The as-fabricated MIL-100 also exhibited excellent recyclability after four adsorption-desorption recycles and can be treated as a potential substance with high removal efficiency of cationic organic dye-containing industrial effluents.
金属有机框架材料（MOFs），尤其是铁基金属有机框架材料（Fe-MOFs），因其具有发达的孔隙结构、水稳定性、易于制备且经济实惠等特点，在去除废水中的有机染料方面展现出了潜在的应用前景。在此，我们采用水热法合成了四种类型的Fe-MOFs（如MIL-88A、MIL-88B、MIL-100和MIL-101）。通过多种方法对产物进行了分析。通过比较这四种类型的Fe-MOFs对三种染料的吸附效果发现，MIL-100在180分钟内对阳离子有机染料亚甲基蓝（MB）和罗丹明B（RhB）具有最佳的吸附效率，而所有MOFs对甲基橙（MO）的去除能力都很微弱。作为吸附剂的MIL-100在不同研究条件下进行了研究，发现其对MB、RhB和MO的最大去除效率分别高达97.36%、88.75%和13.00%。此外，通过吸附动力学和等温线研究，MIL-100对阳离子染料MB的去除符合准二级模型和朗缪尔等温线模型（ = 411.041 mg/g），并且MIL-100能够快速且选择性地从MB和MO的二元混合水溶液中分离出MB。制备的MIL-100在经过四次吸附-解吸循环后还表现出优异的可回收性，可被视为一种对含阳离子有机染料工业废水具有高去除效率的潜在物质。
