LAPSE:2020.0031
Published Article
LAPSE:2020.0031
Preparation of KOH and H3PO4 Modified Biochar and Its Application in Methylene Blue Removal from Aqueous Solution
January 6, 2020
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.
Record ID
Keywords
Adsorption, corn stalk biochar, H3PO4 modification, KOH modification, Methylene blue
Subject
Suggested Citation
Liu L, Li Y, Fan S. Preparation of KOH and H3PO4 Modified Biochar and Its Application in Methylene Blue Removal from Aqueous Solution. (2020). LAPSE:2020.0031
Author Affiliations
Liu L: School of Physics and Electronic Engineering, Fuyang Normal University, Fuyang 236037, China
Li Y: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
Fan S: School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
Li Y: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
Fan S: School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
Journal Name
Processes
Volume
7
Issue
12
Article Number
E891
Year
2019
Publication Date
2019-12-01
Published Version
ISSN
2227-9717
Version Comments
Original Submission
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PII: pr7120891, Publication Type: Journal Article
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Published Article
LAPSE:2020.0031
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External Link
doi:10.3390/pr7120891
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Version History
[v1] (Original Submission)
Jan 6, 2020
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Jan 6, 2020
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https://psecommunity.org/LAPSE:2020.0031
Original Submitter
Calvin Tsay
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