School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education, Guangzhou 510006, China.
School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education, Guangzhou 510006, China; Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Guangzhou 510006, China.
J Environ Sci (China). 2020 May;91:22-34. doi: 10.1016/j.jes.2019.12.014. Epub 2020 Jan 9.
Because of its significant toxicological effects on the environment and human health, arsenic (As) is a major global issue. In this study, an Fe-based metal-organic framework (MOF) (Materials of Institut Lavoisier: MIL-100 (Fe)) which was impregnated with reduced graphene oxide (rGO) by using a simple hydrothermal method and coated with birnessite-type manganese oxide (δ-MnO) using the one-pot reaction process (MIL-100(Fe)/rGO/δ-MnO nanocomposites) was synthesized and applied successfully in As removal. The removal efficiency was rapid, the equilibrium was achieved in 40 min and 120 min for As(III) and As(V), respectively, at a level of 5 mg/L. The maximum adsorption capacities of As(III) and As(V) at pH 2 were 192.67 mg/g and 162.07 mg/g, respectively. The adsorbent revealed high stability in pH range 2-9 and saturated adsorbent can be fully regenerated at least five runs. The adsorption process can be described by the pseudo-second-order kinetic model and Langmuir monolayer adsorption. The adsorption mechanisms consisted of electrostatic interaction, oxidation and inner sphere surface complexation.
由于砷对环境和人类健康具有重大的毒理学影响，因此它是一个全球性的主要问题。在这项研究中，采用简单的水热法将还原氧化石墨烯(rGO)浸渍到一种基于铁的金属有机骨架(MOF)(Lavoisier 研究所材料：MIL-100(Fe))中，并通过一锅反应过程将菱锰矿型氧化锰(δ-MnO)涂覆在其上(MIL-100(Fe)/rGO/δ-MnO 纳米复合材料)。成功地将其用于砷的去除。去除效率很快，在 5mg/L 时，As(III)和 As(V)分别在 40min 和 120min 内达到平衡。在 pH 2 时，As(III)和 As(V)的最大吸附容量分别为 192.67mg/g 和 162.07mg/g。该吸附剂在 pH 2-9 范围内具有高稳定性，至少可进行五次再生以完全再生饱和的吸附剂。吸附过程可以用拟二级动力学模型和 Langmuir 单层吸附来描述。吸附机制包括静电相互作用、氧化和内球表面络合。
