Synergetic effect on methylene blue adsorption to biochar with gentian violet in dyeing and printing wastewater under competitive adsorption mechanism


Decolorization of dyeing/printing wastewater by carbon-based materials has been carried out to study the adsorption of dye molecules onto adsorbent. Biomass-derived activated carbon (SAC) was sampled from cornstalk pyrolysis in the presence of K2CO3 as an activator. Adsorption of methylene blue (MB) and gentian violet (GV) onto SAC was examined to probe the mechanisms, isotherms, and kinetics of dye removal in single- or two-component systems. According to the adsorption rate in a single-component system, three stages were identified. The equilibrium adsorption capacity for MB onto SAC in the single-component system is 274.84 mg g−1 which is higher than that for GV of 266.57, meanwhile the pseudo-second-order (PSO) model would describe the adsorption kinetics with the correlation coefficient higher than 0.99. In the binary GV-MB system, presence of GV promoted MB adsorption to 325.15 mg g−1 and 287.73 mg g−1 at different GV concentrations while the PSO model was also applicable. Furthermore, differences between experimental and calculated values by the Freundlich and Langmuir isotherms indicated the occurrence of competitive adsorption in the two-component system. The gained insights are beneficial for removing the multiple dyes from industrial wastewater, economically and effectively and thus paving the way to the establishment of a greener society.

Publication DOI:
Divisions: College of Engineering & Physical Sciences > Chemical Engineering & Applied Chemistry
Additional Information: Copyright: 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license. Funding: This work was supported by grants from the National Natural Science Foundation of China (No. 51836001), National Key R&D Program of China (NO.2018YFB1501405) and the Jilin Provincial Special Foundation for Industrial Independent Innovation Ability, China (Grant No. 2019C026).
Uncontrolled Keywords: Biomass-derived activated carbon,kinetics,isotherm,dye,waste water
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Related URLs: https://www.sci ... 2628?via%3Dihub (Publisher URL)
PURE Output Type: Article
Published Date: 2021-08-01
Published Online Date: 2021-05-28
Accepted Date: 2021-05-22
Authors: Chen, Qicheng
Zhang, Qiaomu
Yang, Yang (ORCID Profile 0000-0003-2075-3803)
Wang, Qingyan
He, Yifeng
Dong, Nanhang

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