Preparation of KOH and H3PO4 Modified Biochar and Its Application in Methylene Blue Removal from Aqueous Solution
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Improperly treated or directly discharged into the environment, wastewater containing dyes can destroy the quality of water bodies and pollute the ecological environment. The removal of dye wastewater is urgent and essential. In this study, corn stalk was pyrolyzed to pristine biochar (CSBC) in a limited oxygen atmosphere and modified using KOH and H3PO4 (KOH-CSBC, H3PO4-CSBC, respectively). The biochars were characterized by surface area and pore size, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), as well as their behavior in adsorbing methylene blue (MB). Results indicated that the pore structure of CSBC became more developed after modification by KOH. Meanwhile, H3PO4-CSBC contained more functional groups after activation treatment. The pseudo-second-order kinetic and the Langmuir adsorption isotherm represented the adsorption process well. The maximum MB adsorption capacity of CSBC, KOH-CSBC, and H3PO4-CSBC was 43.14 mg g−1, 406.43 mg g−1 and 230.39 mg g−1, respectively. Chemical modification significantly enhanced the adsorption of MB onto biochar, especially for KOH-CSBC. The adsorption mechanism between MB and biochar involved physical interaction, electrostatic interaction, hydrogen bonding and π–π interaction. Hence, modified CSBC (especially KOH-CSBC) has the potential for use as an adsorbent to remove dye from textile wastewater.
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KOH-CSBC has the potential to remove dyes from textile wastewater.
“Therefore, the KOH-CSBC has the potential to remove dyes from textile wastewater (Liu et al. 2019).”
From Modified biochar: synthesis and mechanism for removal of environmental heavy metals (2022) · cites this paper as Liu et al. 2019
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- Authors
- Liu, L., Li, Y., & Fan, S.
- Affiliations
- Fuyang Normal University (CN)
- Guangdong University of Technology (CN)
- Anhui Agricultural University (CN)
- Corresponding author
- Fan, Shisuo
- Venue
- Processes
- Publisher
- MDPI AG
- Published
- 2019-12-01
- Volume
- 7
- Issue
- 12
- Pages
- 891
- ISSN
- 2227-9717 (ISSN-L)
- OpenAlex
- W2991170629
- Cited by
- 160
- References
- 65
- Citations by year
- 2026: 23 · 2025: 30 · 2024: 18 · 2023: 30 · 2022: 38 · 2021: 16 · 2020: 5
- FWCI
- 5.33
- Type
- journal article
- Language
- en
- Open access
- gold
- dx.doi.org
- Licence
- Locations
- Processes (publishedVersion, cc-by)
- Funders
- National Natural Science Foundation of China (51809001)
- Natural Science Foundation of the Education Department of Anhui Province (KJ2018A0125, KJ2018A0347)
- Fuyang Normal University Youth Fund Project (No. 204008134, 2018FSKJ07ZD)
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Environmental Science › Water Science and Technology › Coagulation and Flocculation Studies
- Physical Sciences › Engineering › Biomedical Engineering › Thermochemical Biomass Conversion Processes
- Keywords
- biochar modification, KOH activation, phosphoric acid activation, corn stalk biochar, methylene blue adsorption, dye wastewater treatment, textile wastewater, adsorption mechanism, pore structure, functional groups, adsorption kinetics, Langmuir isotherm
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