Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou 310014, China.
Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou 310014, China; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
J Environ Sci (China). 2019 Jun;80:197-207. doi: 10.1016/j.jes.2018.12.013. Epub 2018 Dec 29.
To obtain a cost-effective adsorbent for the removal of arsenic in water, a novel nanostructured Fe-Co based metal organic framework (MOF-74) adsorbent was successfully prepared via a simple solvothermal method. The adsorption experiments showed that the optimal molar ratio of Fe/Co in the adsorbent was 2:1. The FeCo MOF-74 was characterized by various techniques and the results showed that the nanoparticle diameter ranged from 60 to 80 nm and the specific surface area was 147.82 m/g. The isotherm and kinetic parameters of arsenic removal on FeCo MOF-74 were well-fitted by the Langmuir and pseudo-second-order models. The maximum adsorption capacities toward As(III) and As(V) were 266.52 and 292.29 mg/g, respectively. The presence of sulfate, carbonate and humic acid had no obvious effect on arsenic adsorption. However, coexisting phosphate significantly hindered the removal of arsenic, especially at high concentrations (10 mmol/L). Electrostatic interaction and hydroxyl and metal-oxygen groups played important roles in the adsorption of arsenic. Furthermore, the prepared adsorbent had stable adsorption ability after regeneration and when used in a real-water matrix. The excellent adsorption performance of FeCo MOF-74 material makes it a potentially promising adsorbent for the removal of arsenic.
为了获得一种经济高效的水中砷去除吸附剂，通过简单的溶剂热法成功制备了一种新型纳米结构的 Fe-Co 基金属有机骨架（MOF-74）吸附剂。吸附实验表明，吸附剂中 Fe/Co 的最佳摩尔比为 2:1。采用多种技术对 FeCo MOF-74 进行了表征，结果表明纳米颗粒直径在 60 至 80nm 之间，比表面积为 147.82m/g。砷在 FeCo MOF-74 上的吸附等温线和动力学参数均很好地符合 Langmuir 和拟二级动力学模型。FeCo MOF-74 对 As(III)和 As(V)的最大吸附容量分别为 266.52 和 292.29mg/g。硫酸盐、碳酸盐和腐殖酸的存在对砷吸附没有明显影响。然而，共存的磷酸盐会显著阻碍砷的去除，特别是在高浓度（10mmol/L）下。静电相互作用、羟基和金属-氧基团在砷的吸附中起重要作用。此外，制备的吸附剂在再生后和用于真实水基质时具有稳定的吸附能力。FeCo MOF-74 材料具有优异的吸附性能，使其成为一种很有前途的去除砷的吸附剂。
