Neza Rahayu Palapa, Tarmizi Taher, Alfan Wijaya, Aldes Lesbani
Modification of Cu/Cr layered double hydroxides (LDHs) has been conducted by intercalation using Keggin type polyoxometalate [α-SiW12O40]4- to form CuCr-[α-SiW12O40]. The materials were analyzed by XRD, FTIR, and surface area analyses. Furthermore, materialswere used as selectivity adsorbents of cationic dyes such as malachite green, rhodamine-B and methylene blue. The malachite green is more selective than others from an aqueous solution. The adsorption of malachite green showed that the adsorption capacity of CuCr-[α-SiW12O40] was higher than pristine LDHs. The adsorption process was followed pseudo second order kinetic model and Langmuir isotherm adsorption. The Qmax value of CuCr-[α-SiW12O40] reached 55.322 mg/g at 323 K after 100 minutes adsorption time. Thermodynamic parameters such as ΔG, ΔH and ΔS confirm that the adsorption process was endothermic, spontaneous, and more favorable at high temperatures. The intercalated material was higher structural stability toward reusability adsorbent than pristine LDHs. © 2021 The Authors.
Graduate School of Faculty of Mathematics and Natural Sciences, Sriwijaya University, Palembang, South Sumatra, Indonesia; Department of Environmental Engineering, Institut Teknologi Sumatera, Lampung Selatan, Indonesia; Research Center of Inorganic Materials and Complexes, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Indralaya, Indonesia
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