Lee, Seon Yong Jung, Kyung-Won Choi, Jae-Woo Lee, Young Jae 2024-01-19T19:34:13Z 2024-01-19T19:34:13Z 2021-09-02 2019-07 1385-8947 https://pubs.kist.re.kr/handle/201004/119827 A facile route is reported for the in situ formation of three-dimensionally structured hierarchical Co-Al layered double hydroxide (CoAl-LDH) crystals on a boehmite surface (CoAl-LDH@boehmite) via the dissolution of boehmite followed by the coprecipitation of Co and Al ions on the boehmite surface. The physicochemical properties of the as-prepared materials were characterized and tested for evaluating their sorption affinity toward arsenate (As(V)) in an aqueous solution. The characterization results confirmed that the plate-like CoAlL-DH nanocrystals were densely and uniformly formed on the boehmite surface with a three-dimensional hierarchical structure. Batch experiments were conducted systematically to evaluate the effects of the sorbent dosage, initial pH, competitive anions, and temperature on the sorption behavior of CoAl-LDH@boehmite. The sorption kinetics and isotherms studies indicated that the As(V) sorption processes could be well described by the pseudo-second-order and Sips isotherm models, respectively. The sorption mechanisms were confirmed by various solid phase analyses, including X-ray diffraction, Fourier transform infrared, transmission electron microscopy, X-ray photoelectron spectroscopy, and extended X-ray absorption fine structure. These findings suggest that the intercalation of As(V) into the interlayer region via anion exchange and bidentate-binuclear innersphere surface complexation due to ligand exchange were responsible for the removal of As(V) by CoAl-LDH@boehmite. English ELSEVIER SCIENCE SA In situ synthesis of hierarchical cobalt-aluminum layered double hydroxide on boehmite surface for efficient removal of arsenate from aqueous solutions: Effects of solution chemistry factors and sorption mechanism Article 10.1016/j.cej.2019.03.043 1 CHEMICAL ENGINEERING JOURNAL, v.368, pp.914 - 923 CHEMICAL ENGINEERING JOURNAL 368 914 923 N scie scopus 000462769600085 2-s2.0-85062558273 Engineering, Environmental Engineering, Chemical Engineering Article ADSORPTION WATER PHOSPHATE ADSORBENTS NANOCOMPOSITES PERFORMANCE CO CONTAMINATION SOLUBILITY BEHAVIOR Arsenic removal Layered double hydroxide Boehmite Hierarchical structure Anion exchange Ligand exchange