Fabrication and characterization of magnetic eucalyptus carbon for efficient Cr(VI) removal in aqueous solution and its mechanisms

Zhang, Hua; Wu, Zhenyu; Shi, Qingliang; Khan, Awais; Rad, Saeed; Shahab, Asfandyar; Ullah, Habib; Ali, Enas M.; Arafat, Ahmed; Zeng, Honghu; Luo, Liudan

doi:10.1016/j.arabjc.2023.105047

Cited by 8 publications

(2 citation statements)

References 47 publications

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“…The positive value of ΔS⁰ (25.7 kJ mol -1 ) showed an increase in the degree of randomness during the adsorption process. The literature obtained similar results (Hua et al, 2023). The results indicated that the compound association reaches equilibrium in a short period and at a reasonable temperature.…”

Section: Studying the Effect Of Different Temperatures On The Adsorpt...supporting

confidence: 67%

“…At acidic pH, the predominant species of Cr (VI) was HCrO 4in aqueous solution at pH 2. Increasing the pH changed it to CrO 4 2and Cr 2 O 7 2-(Alfa- Sika et al, 2010;Hua et al, 2023). Therefore, in acidic media, the adsorption surface of coffee husk becomes positively charged by H + ion, which directly approaches the electric attraction of the negatively charged HCrO 4to the binding sites on the adsorbent (Samson & Adedibu, 2016).…”

Section: Characterization Of Coffee Huskmentioning

confidence: 99%

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Applicability of Natural Coffee Husk as a Mesoporous Adsorbent for Removal of Chromium (VI) from Aquatic Environments

Alhogbi

2023

MAS

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Chromium (Cr) is an essential element in plant and animal metabolism, but high accumulation of this metal ion in soil and water from industrial sources has caused concern. This study investigated the removal of Cr (VI), the most mobile and toxic species, using coffee husk biosorption from aqueous solutions. Coffee husk was characterized using Brunauer Emmett Teller (BET) and Fourier Transform Infrared (FTIR) analysis. The effects of pH, adsorbent dosage, contact time, effect of KNO3 concentration, and temperature during the adsorption of Cr (VI) were studied. Infrared spectral studies revealed the presence of functional groups, such as hydroxyl and carboxyl groups, which facilitated the biosorption of Cr (VI). The maximum adsorption capacity reached 87 % at pH~2. Moreover, maximum adsorption capacity of Cr (VI) onto coffee husk 0.660 mg g-1 was recorded after 60 min of using 40 mg L-1 of Cr (VI) with no addition of KNO3 at 40 0C. The kinetic data followed the pseudo-second-order model with regression coefficients R2 = 0.99. The equilibrium data for the adsorption of Cr (VI) onto coffee husk biosorption were fitted into Langmuir and Temkin adsorption isotherm models with R2 = 0.98 corresponding to each model. Thermodynamic studies showed that the coffee husk-Cr (VI) adsorption system was spontaneous and endothermic because negative and positive values were obtained for ΔG° and Δ°H, respectively. The coffee husk was applicable to remove Cr (VI) after three recycling and using different environmental water samples. In conclusion, coffee husk can be used effectively as an adsorption system for Cr (VI) at different polluted sites.

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Section: Studying the Effect Of Different Temperatures On The Adsorpt...supporting

confidence: 67%

Section: Characterization Of Coffee Huskmentioning

confidence: 99%

Applicability of Natural Coffee Husk as a Mesoporous Adsorbent for Removal of Chromium (VI) from Aquatic Environments

Alhogbi

2023

MAS

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Fabrication of a Fe3O4/CS/AgNPs Composite from Indigenous Iron Sand for Enhanced Methylene Blue Adsorption

Ningtyas,

Yanti,

Amin

et al. 2024

J Clust Sci

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Gasification char adsorbent for dye removal: characterization, isotherm, kinetics and thermodynamic studies

Saravanan,

Ahmad,

Khasri

et al. 2024

Biomass Conv. Bioref.

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Fabrication and characterization of magnetic eucalyptus carbon for efficient Cr(VI) removal in aqueous solution and its mechanisms

Cited by 8 publications

References 47 publications

Applicability of Natural Coffee Husk as a Mesoporous Adsorbent for Removal of Chromium (VI) from Aquatic Environments

Applicability of Natural Coffee Husk as a Mesoporous Adsorbent for Removal of Chromium (VI) from Aquatic Environments

Fabrication of a Fe3O4/CS/AgNPs Composite from Indigenous Iron Sand for Enhanced Methylene Blue Adsorption

Gasification char adsorbent for dye removal: characterization, isotherm, kinetics and thermodynamic studies

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