Effectiveness and mechanisms of dye adsorption on a straw-based biochar
Abstract
A biochar (BC) generated from straw as a cost-effective substitute for activated carbon (AC) was tested for its adsorptive ability toward reactive brilliant blue (KNR) and rhodamine B (RB). BC and AC had similar surface areas but differed in porosity, surface acidity and point of zero surface charge. The two carbons were highly effective adsorbents for both dyes at pH 3.0 and 6.5. BC was slightly more effective than AC to adsorb RB due to the RB-BC electrostatic interactions and RB protonation at low pH. The two carbons reversed in their effectiveness to adsorb KNR for similar reasons. The pi-pi interactions between dye molecules and graphene layers of BC, the direct dye-BC electrostatic attraction/repulsion and the intermolecular hydrogen bonding are proposed to be the combined mechanisms for dye adsorption. Rich phenolic hydroxyls on the surface of BC are expected to enhance the pi-pi interactions.
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Biochar from mixed wood wastes pyrolyzed at 450°C for 1 h has maximum adsorption capacities of 1066 mg/g for simazine and 1158 mg/g for atrazine.
“The adsorption capacity of biochar prepared from mixed wood wastes, pyrolysed at 450°C for 1h, was investigated, and maximum adsorption capacities of 1066 and 1158mg/g were obtained for two herbicides, namely simazine and atrazine, respectively (Qiu etal. 2009).”
From Mechanisms and adsorption capacities of biochar for the removal of organic and inorganic pollutants from industrial wastewater (2021) · cites this paper as Qiu et al. 2009
Better adsorption performances for simazine and atrazine by mixed wood waste biochar are obtained in acidic conditions.
“The authors claimed that better adsorption performances were obtained in acidic conditions.”
From Mechanisms and adsorption capacities of biochar for the removal of organic and inorganic pollutants from industrial wastewater (2021) · cites this paper as Qiu et al. 2009
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- Authors
- Qiu, Y., Zheng, Z., Zhou, Z., & Sheng, G. D.
- Affiliations
- Zhejiang University of Technology (CN)
- Corresponding author
- Sheng, G. Daniel
- Venue
- Bioresource Technology
- Publisher
- Elsevier BV
- Published
- 2009-11
- Volume
- 100
- Issue
- 21
- Pages
- 5348-5351
- ISSN
- 0960-8524 (ISSN-L)
- OpenAlex
- W1990022937
- Cited by
- 342
- References
- 16
- Citations by year
- 2026: 18 · 2025: 18 · 2024: 29 · 2023: 30 · 2022: 36 · 2021: 31 · 2020: 32 · 2019: 20 · 2018: 35 · 2017: 24 · 2016: 11 · 2015: 13 · 2014: 13 · 2013: 11 · 2012: 8
- FWCI
- 6.55
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Bioresource Technology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Science Foundation
- Zhejiang University
- National Key Research and Development Program of China
- 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 › Environmental remediation with nanomaterials
- Keywords
- biochar, straw, dye adsorption, rhodamine B, activated carbon, adsorption mechanism, π-π stacking, electrostatic interactions, hydrogen bonding, phenolic hydroxyl groups, surface acidity, porosity, pH effect, low-cost adsorbent
- MeSH terms
- Adsorption, Benzenesulfonates, Cellulose, Charcoal, Coloring Agents, Hydrogen-Ion Concentration, Osmolar Concentration, Rhodamines, Surface Properties, Porosity
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