Abstract
In this study, we evaluated the possibility of the application of amino-silane as a cationic dye adsorbent via chemical modification using lignin. Amino-silane modified lignins (ALs) have been synthesized via amine-silanization. The ALs have high accessibility to pollutants and stability in aqueous solutions owing to their high zeta-potential and specific surface area. Adsorption experiments showed that the ALs exhibited excellent cationic dye removal under neutral and basic conditions. Because ALs contain abundant amine groups, having a lone pair of electrons confers excellent accessibility via electrostatic attraction with cationic dyes. The maximum adsorption amount of the cationic dye reached 197.44 mg·gSUP-1/SUP. All adsorption processes followed the pseudo-second-order kinetics, Langmuir and Temkin isotherm models, and spontaneous processes. Therefore, this study contributes to the development of a low-cost and sustainable lignin-based adsorbent.
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