Investigating Microcystin-LR adsorption mechanisms on mesoporous carbon, mesoporous silica, and their amino-functionalized form: Surface chemistry, pore structures, and molecular characteristics.,Chemosphere

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Investigating Microcystin-LR adsorption mechanisms on mesoporous carbon, mesoporous silica, and their amino-functionalized form: Surface chemistry, pore structures, and molecular characteristics.
Chemosphere ( IF 8.1 ) Pub Date : 2020-01-10 , DOI: 10.1016/j.chemosphere.2020.125811
Jeong-Ann Park ₁ , Jin-Kyu Kang ₂ , Sung-Mok Jung ₃ , Jae-Woo Choi ₄ , Sang-Hyup Lee ₅ , Viviane Yargeau ₆ , Song-Bae Kim ₂

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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 (k2 = 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 Kp,1 of MC-H (2.11 mg/g/min1/2) 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/nm2). Overall, it was demonstrated that adsorption of MC-LR on mesoporous materials is governed by (meso-)pore diffusion and π - π (and hydrophobic) interactions induced by carbon materials; in addition, positively-charged grafted amino groups enhance initial MC-LR adsorption rate.

中文翻译：

研究微囊藻毒素-LR在中孔碳，中孔二氧化硅及其氨基官能化形式上的吸附机理：表面化学，孔结构和分子特征。

微囊藻毒素-LR（MC-LR）是从藻花释放的最常见的氰毒素。该研究通过比较质子化介孔碳/二氧化硅（MC-H，MS-H）及其氨基官能化形式（MC-NH2和MS-NH2）的吸附性能，研究了MC-LR的吸附机理，并考虑了表面化学和孔隙特征。MC-H（37.87 mg / g）的最大MC-LR吸附容量（Langmuir模型）最高，其次是MC-NH2（29.25 mg / g）和MS-NH2（23.03 mg / g），因为孔结构是在氨基官能化过程中部分受损。然而，由于增强的静电相互作用，在早期吸附过程中，MC-NH2（k2 = 0.042 g / mg / min）与MC-LR的反应比MC-H反应更快。颗粒内扩散模型拟合表明，MC-H的Kp，1（2.11 mg / g / min1 / 2）比MC-NH2大，这是因为其更大的表面积和孔体积。而且，大的中孔直径有利于通过孔扩散的MC-LR吸附。吸附剂分子大小对MC-H，MC-NH2和MS-NH2吸附趋势的影响是通过使用活性染料蓝色和酸性橙这两种染料的动力学实验确定的：由于存在大量染料，MS-NH2对两种染料的吸附率最高其表面的氨基数（41.2 NH2 / nm2）。总的来说，证明了MC-LR在介孔材料上的吸附受碳材料诱导的（中-）孔扩散和π-π（和疏水）相互作用的控制。此外，带正电荷的接枝氨基可提高初始MC-LR吸附速率。MC-NH2和MS-NH2是使用两种染料（活性蓝和酸性橙）通过动力学实验确定的：由于其表面上存在大量氨基（41.2 NH2 / nm2），MS-NH2对两种染料的吸附率最高。总的来说，证明了MC-LR在介孔材料上的吸附受碳材料诱导的（中-）孔扩散和π-π（和疏水）相互作用的控制。此外，带正电荷的接枝氨基可提高初始MC-LR吸附速率。MC-NH2和MS-NH2是使用两种染料（活性蓝和酸性橙）通过动力学实验确定的：由于其表面上存在大量氨基（41.2 NH2 / nm2），MS-NH2对两种染料的吸附率最高。总的来说，证明了MC-LR在介孔材料上的吸附受碳材料诱导的（中-）孔扩散和π-π（和疏水）相互作用的控制。此外，带正电荷的接枝氨基可提高初始MC-LR吸附速率。结果表明，MC-LR在介孔材料上的吸附受碳材料诱导的（中-）孔扩散和π-π（和疏水）相互作用的控制。此外，带正电荷的接枝氨基可提高初始MC-LR吸附速率。结果表明，MC-LR在介孔材料上的吸附受碳材料诱导的（中-）孔扩散和π-π（和疏水）相互作用的控制。此外，带正电荷的接枝氨基可提高初始MC-LR吸附速率。

更新日期：2020-01-11

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