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Preparation of Acid- and Alkali-Modified Biochar for Removal of Methylene Blue Pigment
Open accessAbstract
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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“Acid modification increased a large number of oxygen-containing functional groups on biochar.”
From Modified biochar: synthesis and mechanism for removal of environmental heavy metals (2022) · cites this paper as Liu et al. 2020b
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“The maximum sorption capacities of WPC and WSC by the two biomass treatments were 850.9mg · g -1 and 701.3mg · g -1 , respectively (Liu et al. 2020b).”
From Modified biochar: synthesis and mechanism for removal of environmental heavy metals (2022) · cites this paper as Liu et al. 2020b
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“The sorption capacities of MB on different treatment reagents were ZnCl2 > KOH > H 3 PO4 > H 2SO4.”
From Modified biochar: synthesis and mechanism for removal of environmental heavy metals (2022) · cites this paper as Liu et al. 2020b
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“Experimental results showed that the specific surface area of modified biochar after KOH treatment was the highest.”
From Modified biochar: synthesis and mechanism for removal of environmental heavy metals (2022) · cites this paper as Liu et al. 2020b
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Metadata
- 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
- Venue
- ACS Omega
- Publisher
- American Chemical Society (ACS)
- Published
- 2020-11-30
- Volume
- 5
- Issue
- 48
- Pages
- 30906-30922
- ISSN
- 2470-1343 (ISSN-L)
- 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
- 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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