Enhanced adsorption of anionic dyes onto NaOH modified green coffee waste biochar: characteristics and performance evaluation
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F25%3A63581519" target="_blank" >RIV/70883521:28610/25:63581519 - isvavai.cz</a>
Result on the web
<a href="https://link.springer.com/article/10.1007/s13762-024-06090-w" target="_blank" >https://link.springer.com/article/10.1007/s13762-024-06090-w</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s13762-024-06090-w" target="_blank" >10.1007/s13762-024-06090-w</a>
Alternative languages
Result language
angličtina
Original language name
Enhanced adsorption of anionic dyes onto NaOH modified green coffee waste biochar: characteristics and performance evaluation
Original language description
Synthetic dyes are resistant to self-degradation in aqueous systems that pose severe health hazards to marine life. This work focuses on the comparative adsorption evaluation of synthesized biochar derived from green coffee wastes (GCB) and NaOH-modified GCB (NaOH-GCB) for the removal of anionic dyes (Eriochrome Black T and Congo Red) in aqueous solution. The characterization results of NaOH-GCB indicate higher thermal stability, improved surface functionality with -OH groups, smaller particle size (from 2–15 µm decreased to 0.5–1 µm), higher pore volume (increase from 0.0027 to 0.003 cm3/g), and higher surface area (increase from 2.91 to 3.22 m2/g) which enhanced dye adsorption. The maximum adsorption capacity was attained using NaOH-GCB with values of 119.37 mg/g and 91.54 mg/g recorded for EBT and CR, respectively. For both adsorbents, the optimal removal for EBT and CR dyes was obtained at solution pH 2 and 7 due to electrostatic and hydrogen bonding interactions. CR had slightly lower removal than EBT due to its hydrophobic nature. Pseudo-second order and Redlich-Peterson were the most effective models in providing insights about the adsorption kinetics and isotherm, with the system being heterogeneous and involving multi-layer behavior. Additionally, thermodynamics elucidated the adsorption to be spontaneous and exothermic. After five reusability cycles, the NaOH-GCB indicated excellent performance of over 90% removal for both dyes. The results show that NaOH-GCB is potentially an economical adsorbent for efficient and effective remediation of dye-contaminated wastewater streams.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10503 - Water resources
Result continuities
Project
—
Continuities
N - Vyzkumna aktivita podporovana z neverejnych zdroju
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
International Journal of Environmental Science and Technology
ISSN
1735-1472
e-ISSN
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Volume of the periodical
22
Issue of the periodical within the volume
Neuveden
Country of publishing house
US - UNITED STATES
Number of pages
18
Pages from-to
7721-7738
UT code for WoS article
001351974900001
EID of the result in the Scopus database
2-s2.0-85208178177