Zhang Fuyan, Ma Miaomiao, Li Shuang, Zhou Yuting, Zeng Jian, Huang Meiqi, Sun Qi, Le Tao
College of Life Sciences, Chongqing Normal University, Chongqing 401331, China.
Chongqing Key Laboratory of Conservation and Utilization of Freshwater Fishes, College of Life Sciences, Chongqing Normal University, Chongqing 401331, China.
Molecules. 2024 Oct 14;29(20):4860. doi: 10.3390/molecules29204860.
In the critical domain of wastewater treatment, the development of cost-effective, durable, and recyclable adsorbents with high adsorption capacities remains a significant challenge. This study introduces a novel magnetic bimetallic Metal-Organic Framework (MOF) adsorbent, MZIF-67-Co/Cu, doped with copper ions. The MZIF-67-Co/Cu adsorbent was successfully synthesized and structurally characterized, demonstrating remarkable selectivity for removing methyl orange (MO) from water. This high selectivity is attributed to the adsorbent's high porosity and Lewis base properties at the coordinating metal ion center. The incorporation of Cu ions significantly enhances the porous architecture and increases the number of metal adsorption sites, leading to an impressive maximum MO adsorption capacity of 39.02 mg/g under optimized conditions (0.5 g/L adsorbent concentration, pH 3.0, 250 rpm agitation speed, adsorption time > 10 min). The adsorption kinetics closely follow the pseudo-second-order model, and the isotherm data fit well with the Langmuir model. The primary adsorption mechanisms involve electrostatic attraction and mesoporous interaction. This study highlights MZIF-67-Co/Cu as a highly efficient adsorbent with magnetic recovery capabilities, positioning it as a promising candidate for addressing critical issues in wastewater treatment.
在废水处理的关键领域，开发具有高吸附容量、成本效益高、耐用且可回收的吸附剂仍然是一项重大挑战。本研究引入了一种新型的磁性双金属金属有机框架（MOF）吸附剂MZIF-67-Co/Cu，其掺杂了铜离子。成功合成了MZIF-67-Co/Cu吸附剂并对其进行了结构表征，结果表明该吸附剂对从水中去除甲基橙（MO）具有显著的选择性。这种高选择性归因于吸附剂在配位金属离子中心处的高孔隙率和路易斯碱性质。铜离子的掺入显著增强了多孔结构并增加了金属吸附位点的数量，在优化条件下（吸附剂浓度0.5 g/L、pH 3.0、搅拌速度250 rpm、吸附时间>10分钟），最大MO吸附容量达到了令人印象深刻的39.02 mg/g。吸附动力学密切遵循准二级模型，等温线数据与朗缪尔模型拟合良好。主要吸附机制包括静电吸引和介孔相互作用。本研究强调了MZIF-67-Co/Cu作为一种具有磁回收能力的高效吸附剂，使其成为解决废水处理关键问题的有前途的候选材料。
