Cited by 210Adsorption and biosorption for pollutant removalThermochemical Biomass Conversion ProcessesAdsorption, diffusion, and thermodynamic properties of materials

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Preparation of Acid- and Alkali-Modified Biochar for Removal of Methylene Blue Pigment

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Liu, Can, Wang, Wendong, Wu, Rui, Liu, Yun, Lin, Xu, Kan, Huan, Zheng, Yunwu·2020·ACS Omega

DOI 10.1021/acsomega.0c03688PMC PMC7726758

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Abstract

Walnut shell biochar (WSC) and wood powder biochar (WPC) prepared using the limited oxygen pyrolysis process were used as raw materials, and ZnCl2, KOH, H2SO4, and H3PO4 were used to modify them. The evaluation of the liquid-phase adsorption performance using methylene blue (MB) as a pigment model showed that modified biochar prepared from both biomasses had a mesoporous structure, and the pore size of WSC was larger than that of WPC. However, the alkaline modified was more conducive to the formation of pores in the biomass-modified biochar materials; KOH treatment resulted in the highest modified biochar-specific surface area. The isothermal adsorption of MB by the two biomass pyrolysis charcoals conformed to the Freundlich equation, and the adsorption process conformed to the quasi-second-order kinetic equation, which is mainly physical adsorption. The large number of oxygen-containing functional groups on the particle surface provided more adsorption sites for MB adsorption, which was beneficial to the adsorption reactions. The adsorption effects of woody biomass were obviously higher than that of shell biomass, and the adsorption capacities of the two raw materials’ pyrolysis charcoal were in the order of WPC > WSC. The adsorption effects of different treatment reagents on MB were in the order ZnCl2 > KOH > H3PO4 > H2SO4. The maximum adsorption capacities of the two biomass treatments were 850.9 mg/g for WPC with ZnCl2 treatment and 701.3 mg/g for WSC with KOH treatment.

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Authors: Liu, C., Wang, W., Wu, R., Liu, Y., Lin, X., Kan, H., & Zheng, Y.
Affiliations: Southwest Forestry University (CN)
Corresponding author: Kan, Huan
Zheng, Yunwu
ORCID: Liu, Can
Wang, Wendong
Wu, Rui
Liu, Yun
Lin, Xu
Kan, Huan
Zheng, Yunwu
Venue: ACS Omega
Publisher: American Chemical Society (ACS)
Published: 2020-11-30
Volume: 5
Issue: 48
Pages: 30906-30922
ISSN: 2470-1343 (ISSN-L)
DOI: 10.1021/acsomega.0c03688
PMC: PMC7726758
OpenAlex: W3107557650
Cited by: 210
References: 47
Citations by year: 2026: 40 · 2025: 42 · 2024: 44 · 2023: 41 · 2022: 33 · 2021: 10
FWCI: 6.44
Type: journal article
Language: en
Open access: gold
doi.org
Licence: cc-by-nc-nd
pubs.acs.org/page/policy/authorchoice_ccbyncnd_termsofuse.html (vor)
Locations: ACS Omega (publishedVersion, cc-by-nc-nd)
PubMed Central (publishedVersion)
PubMed (publishedVersion)
DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders: National Natural Science Foundation of China (31960296)
Ministry of Science and Technology of the People's Republic of China (2019YFD1002404)
Yunnan Provincial Science and Technology Department (2017FG001-001, 2017FG001-072, 2018ZG004, 202002AA10007)
Key Laboratory of State Forestry Administration for Highly-Efficient Utilization of Forestry Biomass Resources, Southwest Forestry University (2019-KF05)
Topics: Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
Physical Sciences › Energy › Fuel Technology › Thermochemical Biomass Conversion Processes
Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Adsorption, diffusion, and thermodynamic properties of materials
Keywords: biochar modification, methylene blue adsorption, walnut shell biochar, acid modification, alkali modification, ZnCl2 activation, KOH activation, phosphoric acid activation, mesoporous structure, oxygen-containing functional groups, Freundlich isotherm, pseudo-second-order kinetics, dye removal

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Preparation of Acid- and Alkali-Modified Biochar for Removal of Methylene Blue Pigment

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