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Title: Comparative Study on Adsorption of Crystal Violet and Chromium (VI) by Activated Carbon Derived from Spent Coffee Grounds
Authors: Loulidi, Ilyasse 
Jabri, Maria 
Amar, Abdelouahed 
Kali, Abderahim 
A. Alrashdi, Awad 
Hadey, Chaimaa 
Ouchabi, Mbarka 
Abdullah, P. 
Lgaz, Hassane 
Cho, Youngjae 
Boukhlifi, Fatima 
Keywords: activated carbon;adsorption;isotherm
Issue Date: 2023
Publisher: Applied Sciences
Journal: Applied Sciences (Switzerland) 
In the context of the circular economy, used coffee grounds were transformed into powdered activated carbon by chemical activation using potassium hydroxide. Its characterisation was conducted in comparison with that of a commercial activated carbon by scanning electron microscopy (SEM) coupled with energy dispersive X-ray microanalysis (EDX), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Boehm titration, and point zero charge (pHPZC) and by determination of the methylene blue number (MBN) and the iodine number (IN). Performance of the prepared activated carbon was tested in the adsorption of the cationic dye crystal violet (CV) and hexavalent chromium. Batch adsorption tests were carried out and the effects of operating parameters were studied. The results collected on the adsorption kinetics show that the adsorption followed pseudo-second order kinetics and that the Langmuir isotherm best fits the equilibrium data for crystal violet and hexavalent chromium. The thermodynamic study showed that the adsorption of both adsorbates is spontaneous and exothermic and leads to a decrease in disorder at the solid–liquid interfaces. These results indicate that this activated carbon can be used as an alternative adsorbent to remove cationic dyes and heavy metals from aqueous solutions.
Web of Science / Scopus
ISSN: 20763417
DOI: 10.3390/app13020985
Appears in Collections:Faculty of Agro Based Industry - Journal (Scopus/WOS)

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