Park, Jeong-Ann Kang, Jin-Kyu Jung, Sung-Mok Choi, Jae-Woo Lee, Sang-Hyup Yargeau, Viviane Kim, Song-Bae 2024-01-19T17:33:22Z 2024-01-19T17:33:22Z 2021-09-05 2020-05 0045-6535 https://pubs.kist.re.kr/handle/201004/118666 Microcystin-LR (MC-LR) is the most common cyanotoxin released from algal-blooms. The study investigated the MC-LR adsorption mechanisms by comparing adsorption performance of protonated mesoporous carbon/silica (MC-H, MS-H) and their amino-functionalized forms (MC-NH2 and MS-NH2) considering surface chemistry and pore characteristics. The maximum MC-LR adsorption capacity (Langmuir model) of MC-H (37.87 mg/g) was the highest followed by MC-NH2 (29.25 mg/g) and MS-NH2 (23.03 mg/g), because pore structure is partly damaged during amino-functionalization. However, MC-NH2 (k(2) = 0.042 g/mg/min) reacted faster with MC-LR than MC-H during early-stage adsorption due to enhancing electrostatic interactions. Intra-particle diffusion model fit indicated K-p,K-1 of MC-H (2.11 mg/g/min(1/2)) was greater than MC-NH2 due to its greater surface area and pore volume. Also, large mesopore diameters are favorable to MC-LR adsorption by pore diffusion. The effect of adsorbate molecular size on adsorption trend against MC-H, MC-NH2 and MS-NH2 was determined by kinetic experiments using two dyes, reactive blue and acid orange: MS-NH2 achieved the highest adsorption for both dyes due to the large number of amino groups on its surface (41.2 NH2/nm(2)). Overall, it was demonstrated that adsorption of MC-LR on mesoporous materials is governed by (meso-)pore diffusion and pi - pi (and hydrophobic) interactions induced by carbon materials; in addition, positively-charged grafted amino groups enhance initial MC-LR adsorption rate. (C) 2020 Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD Investigating Microcystin-LR adsorption mechanisms on mesoporous carbon, mesoporous silica, and their amino-functionalized form: Surface chemistry, pore structures, and molecular characteristics Article 10.1016/j.chemosphere.2020.125811 1 CHEMOSPHERE, v.247 CHEMOSPHERE 247 N scie scopus 000527924400020 2-s2.0-85077703988 Environmental Sciences Environmental Sciences & Ecology Article SPECTROSCOPY EQUILIBRIUM PHENOL ACTIVATED CARBON EFFICIENT REMOVAL AQUEOUS-SOLUTIONS OXIDE FILMS WATER DYES IDENTIFICATION Mesoporous carbon Mesoporous silica Amino-functionalization Microcystin-LR Pore diffusion Molecular characteristics