Enhanced adsorption of anionic dyes onto NaOH modified green coffee waste biochar: characteristics and performance evaluation

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Enhanced adsorption of anionic dyes onto NaOH modified green coffee waste biochar: characteristics and performance evaluation

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Enhanced adsorption of anionic dyes onto NaOH modified green coffee waste biochar: characteristics and performance evaluation

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10503 - Water resources

Projekt

—

Návaznosti

N - Vyzkumna aktivita podporovana z neverejnych zdroju

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

International Journal of Environmental Science and Technology

ISSN

1735-1472

e-ISSN

—

Svazek periodika

22

Číslo periodika v rámci svazku

Neuveden

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

18

Strana od-do

7721-7738

Kód UT WoS článku

001351974900001

EID výsledku v databázi Scopus

2-s2.0-85208178177