Kinetics, thermodynamics and mechanistic studies of carbofuran removal using biochars from tea waste and rice husks
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This study reports the thermodynamic application and non-linear kinetic models in order to postulate the mechanisms and compare the carbofuran adsorption behavior onto rice husk and tea waste derived biochars. Locally available rice husk and infused tea waste biochars were produced at 700 °C. Biochars were characterized by using proximate, ultimate and surface characterization methods. Batch experiments were conducted at 25, 35, and 45 °C for a series of carbofuran solutions ranging from 5 to 100 mg L(-1) with a biochar dose of 1 g L(-1) at pH 5.0 with acetate buffer. Molar O/C ratios indicated that rice husk biochar (RHBC700) is more hydrophilic than tea waste biochar (TWBC700). Negative ΔG (Gibbs free energy change) values indicated the feasibility of carbofuran adsorption on biochar. Increasing ΔG values with the rise in temperature indicated high favorability at higher temperatures for both RHBC and TWBC. Enthalpy values suggested the involvement of physisorption type interactions. Kinetic data modeling exhibited contribution of both physisorption, via pore diffusion, π*-π electron donor-acceptor interaction, H-bonding, and van der Waals dispersion forces and chemisorption via chemical bonding with phenolic, and amine groups. Equilibrium adsorption capacities of RHBC and TWBC determined by pseudo second order kinetic model were 25.2 and 10.2 mg g(-1), respectively.
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Biochar is rich in aromatic structure and is an excellent adsorbent for removing hydrophobic organic contaminants.
“BC is rich in aromatic structure, and it was an excellent adsorbent for removing hydrophobic organics contaminants (Vithanage etal. 2015).”
From Review of organic and inorganic pollutants removal by biochar and biochar-based composites (2021) · cites this paper as Vithanage et al. (2015)
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- Authors
- Vithanage, M., Mayakaduwa, S. S., Herath, I., Ok, Y. S., & Mohan, D.
- Affiliations
- National Institute of Fundamental Studies (LK)
- Kangwon National University (KR)
- Jawaharlal Nehru University (IN)
- Corresponding author
- Vithanage, Meththika
- Venue
- Chemosphere
- Publisher
- Elsevier BV
- Published
- 2016-05
- Volume
- 150
- Pages
- 781-789
- ISSN
- 0045-6535 (ISSN-L)
- OpenAlex
- W2175523292
- Cited by
- 233
- References
- 50
- Citations by year
- 2026: 16 · 2025: 14 · 2024: 25 · 2023: 24 · 2022: 32 · 2021: 35 · 2020: 27 · 2019: 23 · 2018: 17 · 2017: 13 · 2016: 7
- FWCI
- 8.17
- Type
- journal article
- Language
- en
- Open access
- green
- figshare.com
- Licence
- Locations
- Chemosphere (publishedVersion)
- PubMed (publishedVersion)
- Figshare (submittedVersion, cc-by)
- Funders
- World Health Organization
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Environmental Science › Pollution › Pesticide and Herbicide Environmental Studies
- Physical Sciences › Engineering › Biomedical Engineering › Environmental remediation with nanomaterials
- Keywords
- carbofuran, pesticide adsorption, biochar, rice husk biochar, adsorption kinetics, adsorption thermodynamics, pseudo-second-order kinetics, physisorption, chemisorption, adsorption mechanism, agricultural waste valorization
- MeSH terms
- Adsorption, Carbofuran, Charcoal, Kinetics, Oryza, Temperature, Thermodynamics, Waste Products, Water Pollutants, Chemical, Camellia sinensis
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