Department of Environmental Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea.
Department of Environmental Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea.
J Hazard Mater. 2021 May 5;409:124415. doi: 10.1016/j.jhazmat.2020.124415. Epub 2020 Nov 2.
We developed a Cu/CuO-immobilized filter-type adsorbent for efficient iodide anion removal. A cellulose filter (CF) was used as a support, and its surface was modified using acrylic acid to enhance copper immobilization. The modified filter (CF-AA) exhibited 10x higher copper adsorption than the unmodified filter. Cu/CuO was prepared on CF-AA by using a simple hydrothermal method to obtain CF-AA-Cu, and the prepared Cu/CuO was characterized with scanning electron microscopy/energy-dispersive spectroscopy, x-ray photoelectron spectroscopy, and thermogravimetric analysis. While CF and CuO themselves exhibited limited iodide adsorption performance, CF-AA-Cu exhibited fast adsorption kinetics with a half-life of 60 min as well as a high adsorption capacity of 10.32 mg/g, as obtained using the Langmuir adsorption isotherm model. Moreover, it exhibited high selectivity for iodide when high concentrations of other anions were present. The adsorption mechanism was proved by means of material characterization before and after adsorption. The coexistence of Cu, Cu, and Cu in CF-AA-Cu make it effective in broader pH conditions via the redox reaction between Cu and Cu. Overall, iodide adsorbents in the form of filters with high adsorption capacity, selectivity, and ability over a wide pH range are potentially useful for removing iodide from water.
我们开发了一种用于高效去除碘离子的 Cu/CuO 固载型过滤吸附剂。纤维素过滤器（CF）用作载体，其表面经过丙烯酸改性以增强铜的固载。改性后的过滤器（CF-AA）比未改性的过滤器的铜吸附量高 10 倍。通过简单的水热法在 CF-AA 上制备了 Cu/CuO，得到 CF-AA-Cu，并通过扫描电子显微镜/能谱、X 射线光电子能谱和热重分析对其进行了表征。虽然 CF 和 CuO 本身对碘离子的吸附性能有限，但 CF-AA-Cu 表现出快速的吸附动力学，半衰期为 60 分钟，吸附容量高达 10.32mg/g，这是通过 Langmuir 吸附等温模型得到的。此外，当存在高浓度的其他阴离子时，它对碘化物表现出高选择性。吸附机制通过吸附前后的材料表征得到了证明。CF-AA-Cu 中的 Cu、Cu 和 Cu 共存，使得其在更宽的 pH 条件下通过 Cu 和 Cu 之间的氧化还原反应有效。总的来说，具有高吸附容量、选择性和在较宽 pH 范围内的能力的过滤器形式的碘化物吸附剂对于从水中去除碘化物具有潜在的用途。
