Comparative Study on Adsorption of Crystal Violet and Chromium (VI) by Activated Carbon Derived from Spent Coffee Grounds
Source abstract
Abstract
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.
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Research context
OpenAlex topics: Adsorption and biosorption for pollutant removal · Dye analysis and toxicity · Electrochemical sensors and biosensors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Laboratory of Chemistry and Biology Applied to the Environment, URL-CNRST-N°13, Faculty of Sciences, Moulay Ismail University, Meknes 50050, Morocco
Chemistry Department, Al-Qunfudah University College, Umm Al-Qura University, Mecca 24382, Saudi Arabia
Laboratory of Catalysis and Corrosion of Materials, Faculty of Sciences, Chouaïb Doukkali University, El Jadida 24000, Morocco
Faculty of Agro-Based Industry, Universiti Malaysia, Kelantan Jeli Campus, Jeli Kelantan 17600, Malaysia
Innovative Durable Building and Infrastructure Research Center, Center for Creative Convergence Education, Hanyang University ERICA, 55 Hanyangdaehak-ro, Sangrok-gu, Ansan-si 15588, Republic of Korea
Department of Food Science and Technology, Pusan National University, 1268-50 Samrangjin-ro, Samrangjin-eup, Miryang 50463, Republic of Korea
Funding
Umm Al-Qura University
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