Jang Seok Byum, Choong Choe Earn, Pichiah Saravanan, Choi Jae Young, Yoon Yeomin, Choi Eun Ha, Jang Min
Department of Environmental Engineering, Kwangwoon University, 20 Kwangwoon-Ro, Nowon-Gu, Seoul 01897, Republic of Korea; Plasma Bioscience Research Center/Department of Electrical and Biological Physics, Kwangwoon University, Seoul 01897, Republic of Korea.
Department of Environmental Engineering, Kwangwoon University, 20 Kwangwoon-Ro, Nowon-Gu, Seoul 01897, Republic of Korea; Plasma Bioscience Research Center/Department of Electrical and Biological Physics, Kwangwoon University, Seoul 01897, Republic of Korea.
J Hazard Mater. 2022 Feb 15;424(Pt A):127267. doi: 10.1016/j.jhazmat.2021.127267. Epub 2021 Sep 20.
Novel integration of adsorption followed by catalytic oxidation is expected to be more beneficial for higher Mn(II) removal performance. We prepared self-assembled 3D flower-like Mg(OH) coated on granular-sized polyurethane (namely FMHP) via hydrothermal method at 120 °C under a facile synthesis route. The optimized material, FMHP prepared with 7 g MgO and 20 g polyurethane (FMHP), achieved up to 351.2 mg g Mn(II) removal capacity by Langmuir isotherm model. Besides, FMHP exhibited high Mn(II) removal in a wide range of NaCl concentration (0~0.1 M) and pH 2-9. Notably, through consecutive kinetics, BET, XPS, XRD, FESEM, and TEM analyses, it was found that the MnO layer grows in-situ via ion exchange with Mg(II) on FMHP and further boosts the Mn(II) removal via catalytic oxidation during the Mn(II) removal process. Further, column experiments revealed that the FMHP exhibited superior Mn(II) removal capacities up to 135.9 mg g and highly compatible treatment costs ($0.062 m) compared to conventional chemical processes. The granular-sized FMHP prepared by economic precursors and simple synthesis route revealed a high potential for Mn(II) containing water treatment due to its high removal capacities and easy operation.
吸附后催化氧化的新型集成有望对更高的锰（II）去除性能更有益。我们通过水热法在120°C下，采用简便的合成路线制备了包覆在颗粒状聚氨酯上的自组装三维花状氢氧化镁（即FMHP）。用7 g氧化镁和20 g聚氨酯制备的优化材料FMHP，根据朗缪尔等温线模型，实现了高达351.2 mg g的锰（II）去除容量。此外，FMHP在广泛的氯化钠浓度（0~0.1 M）和pH值2 - 9范围内表现出高的锰（II）去除率。值得注意的是，通过连续动力学、BET、XPS、XRD、FESEM和TEM分析发现，MnO层通过与FMHP上的镁（II）进行离子交换原位生长，并在锰（II）去除过程中通过催化氧化进一步提高锰（II）的去除率。此外，柱实验表明，与传统化学工艺相比，FMHP表现出高达135.9 mg g的优异锰（II）去除容量和高度兼容的处理成本（0.062美元/立方米）。由经济前驱体和简单合成路线制备的颗粒状FMHP，因其高去除容量和易于操作，在含锰（II）水处理方面显示出巨大潜力。
