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Enhanced adsorption of Methylene blue with walnut shell carbon chemically activated by K2CO3

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Abstracts

In this study, walnut shell-based activated carbon (WSAC2-900) was prepared by pyrolysis-carbonization coupled with chemical activation of K2CO3 for the first time. The samples were characterized by XRD, nitrogen adsorption/desorption, SEM and FTIR. In addition, the zero-point potential pHpzc was determined. The specific surface area of WSAC2-900 reached 1690 m2/g, and the total pore volume was 0.73 cm3/g, of which 87.7% was the micropore volume. The surface of WSAC2-900 is rich in many oxygen-containing functional groups, such as hydroxyl and aldehyde groups, and its zero-charge point pHpzc is less than 2. The isotherms, kinetics and thermodynamics of MB adsorption by WSAC2-900 were investigated. The removal efficiency of WSAC2-900 for MB reached 99.6%, and the maximum adsorption capacity reached 557.5462 mg/g. At 283 K, 293 K, 303 K and 313 K, the maximum adsorption capacities of MB were 468.1695 mg/g, 506.3057 mg/g, 524.4298 mg/g and 548.2178 mg/g, respectively. In addition, the mechanism of MB adsorption by WSAC2-900 was discussed. 

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The data that support the findings of this study are available on request from the corresponding author.

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Funding

This work was supported by the National Natural Science Foundation of China (No. 52376199), the Special Project Fund of “Taishan Scholar” of Shandong Province (No. tsqn202103066) and the China Postdoctoral Science Foundation (No. 2021M691969).

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  1. College of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, 255000, Shandong, China

    Gangxin Ren, Zhiyu Li & Peng Fu

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Gangxin Ren (First Author): Conceptualization, Methodology, Software, Investigation, Formal Analysis, Writing - Original Draft; Zhiyu Li and Peng Fu (Corresponding Author): Data Curation, Supervision.

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Ren, G., Li, Z. & Fu, P. Enhanced adsorption of Methylene blue with walnut shell carbon chemically activated by K2CO3. Biomass Conv. Bioref. (2024). https://doi.org/10.1007/s13399-024-05742-8

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