Mn-doped zirconium metal-organic framework as an effective adsorbent for removal of tetracycline and Cr(VI) from aqueous solution
Mn-doped zirconium metal-organic framework as an effective adsorbent for removal of tetracycline and Cr(VI) from aqueous solution
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锰掺杂锆金属有机骨架作为有效吸附剂去除水溶液中的四环素和 Cr(VI)
DOI：
10.1016/j.micromeso.2018.11.014
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发表时间：
2019-03-15
影响因子：
5.2
通讯作者：
Zhang, Yan-ru
中科院分区：
文献类型：
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作者：
Yang, Zhao-hui;Cao, Jiao;Zhang, Yan-ru
具有多孔特性的金属 - 有机骨架（MOFs）在环境修复中备受关注。在此，采用简便的溶剂热法制备了具有立方形态的锰掺杂UiO - 66（记为MnUiO - 66）。为了研究MnUiO - 66的吸附性能，选择四环素（TC）和六价铬（Cr(VI)）作为目标污染物。MnUiO - 66对TC和Cr(VI)的最大吸附量分别为184.493 mg/g和32.773 mg/g，分别是原始UiO - 66的4.9倍和3.1倍。研究了溶液pH值、初始浓度和共存离子对吸附量的影响，并基于zeta电位测量提出了吸附机理。MnUiO - 66对TC和Cr(VI)的吸附过程最符合准二级动力学和朗缪尔模型，这表明化学吸附在吸附反应中占主导地位，且MnUiO - 66吸附剂具有均匀的吸附表面。吸附热力学研究表明，TC和Cr(VI)在MnUiO - 66上的吸附过程是自发的且放热的。此外，MnUiO - 66在TC - Cr(VI)混合样品和制药废水中表现出优异的吸附性能。更重要的是，再生实验表明MnUiO - 66吸附剂可循环使用。这项工作为制备用于水净化的基于MOFs的吸附剂提供了有益的见解。
Metal-organic frameworks (MOFs) with porous property have gained much concern in environment remediation. Herein, the Mn-doped UiO-66 (denoted as MnUiO-66) with cubic morphology was fabricated with a facile solvothermal method. To investigate the adsorption performance of MnUiO-66, tetracycline (TC) and Cr(VI) were chosen as the target pollutant. The maximum adsorption capacity of MnUiO-66 for TC and Cr(VI) were 184.493 mg g(-1) and 32.773 mg g(-1), respectively, which were 4.9 and 3.1 times higher than the pristine UiO-66. Effects of the solution pH values, initial concentrations and coexisting ions on adsorption capacity were investigated and the adsorption mechanism based on zeta potential measurement was proposed. The adsorption process of MnUiO-66 over TC and Cr(VI) had the most accordance with pseudo-second-order and Langmuir models, which suggested that chemisorption was dominant in adsorption reaction and the MnUiO-66 adsorbent had a homogenous surface for adsorption. Adsorption thermodynamic studies implied that the adsorption process of TC and Cr(VI) on MnUiO-66 were spontaneous and exothermic. In addition, the MnUiO-66 showed excellent adsorption performance in TC-Cr(VI) mixed sample and pharmaceutical wastewater. More importantly, the regeneration experiment indicated the MnUiO-66 adsorbent was recyclable. This work provided a useful insight into the fabrication MOFs-based adsorbent for water purification.