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Molecules 2018, 23(7), 1606;

Using Natural Biomacromolecules for Adsorptive and Enzymatic Removal of Aniline Blue from Water

Fermentation Technology Division, Huanghuai University, Zhumadian 463000, China
Henan Dongfangrun Environmental Protection Technology Co. Ltd., Zhumadian 463000, China
Author to whom correspondence should be addressed.
Academic Editors: Elena Ibañez and Farid Chemat
Received: 6 June 2018 / Revised: 24 June 2018 / Accepted: 25 June 2018 / Published: 2 July 2018
(This article belongs to the Special Issue Green Extraction, Separation and Purification Processes)
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The present study investigated the adsorptive and enzymatic removal of aniline blue dye (AB) from aqueous solution using waxy riceprocessing waste (RW), peanut shell (PS), microbial waste of Aspergillus niger (MW) as low cost adsorbents, and laccase (Lac) as a biocatalyst. Commercial activated carbon (AC) was also employed to compare the adsorption performance with the three adsorbents. Dye removal was examined under various parameters in batch experiments. It was found that dye removal by RW and Lac was 89–94% noticeably better than that by MW and PS (20–70%). In any cases, AC produced the highest dye removal among the tested materials. The kinetics, isotherms, and thermodynamics were then analyzed to elucidate the adsorption process by the four adsorbents. The pseudo-second order kinetic was superior to the pseudo first order kinetic model in describing adsorption for all adsorbents. The Langmuir model fitted the adsorption process very well, indicating monolayer coverage of dyes on a solid surface. A thermodynamic analysis of enthalpy (ΔH°), entropy (ΔS°), and Gibbs free energy (ΔG°) classified the adsorption as a nonspontaneous and endothermic process. The results reveal diverse natural materials (e.g., processing waste RW) as novel substitutes for traditional activated carbon, as well as laccase as a green catalyst for the treatment of dye wastewater. View Full-Text
Keywords: adsorption; adsorbent; laccase; aniline blue; dye removal adsorption; adsorbent; laccase; aniline blue; dye removal

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You, X.; Li, E.; Liu, J.; Li, S. Using Natural Biomacromolecules for Adsorptive and Enzymatic Removal of Aniline Blue from Water. Molecules 2018, 23, 1606.

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