Assessment of Untreated Coffee Wastes for the Removal of Chromium (VI) from Aqueous Medium | Zendy

Ilyasse Loulidi | Zendy; Fatima Boukhlifi | Zendy; Mbarka Ouchabi | Zendy; Abdelouahed Amar | Zendy; Maria Jabri | Zendy; Abderahim Kali | Zendy; Chaimaa Hadey | Zendy

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Assessment of Untreated Coffee Wastes for the Removal of Chromium (VI) from Aqueous Medium

Author(s) -

Ilyasse Loulidi,

Fatima Boukhlifi,

Mbarka Ouchabi,

Abdelouahed Amar,

Maria Jabri,

Abderahim Kali,

Chaimaa Hadey

Publication year - 2021

Publication title -

international journal of chemical engineering

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.309

H-Index - 25

eISSN - 1687-8078

pISSN - 1687-806X

DOI - 10.1155/2021/9977817

Subject(s) - adsorption , chromium , aqueous solution , context (archaeology) , langmuir adsorption model , exothermic reaction , chemistry , nuclear chemistry , raw material , kinetics , pulp and paper industry , chromatography , organic chemistry , physics , paleontology , engineering , biology , quantum mechanics

Industrial discharges loaded with heavy metals present several problems for aquatic ecosystems and human health. In this context, the present study aims to evaluate the potential of raw spent coffee grounds to remove chromium from an aqueous medium. A structural and textural study of coffee grounds was carried out by FTIR, XRD, and TGA analysis. The optimum conditions for the removal of Cr(VI), for a solution with an initial concentration of 100 mg/l, were adsorbent dose 2.5 g/l, pH 4.0, and contact time 90 min. The adsorption equilibrium results show that the Langmuir isotherm best describes the process with an adsorption capacity of 42.9 mg/g and that the adsorption kinetics follows the pseudosecond-order model. The calculated thermodynamic parameters showed that the adsorption is exothermic and spontaneous. The activation energy value (Ea) indicated that the retention is physisorptive in nature. The regeneration of the adsorbent was carried out by three eluents, among which HCl was the best. Finally, a brief cost estimation showed the great potential of coffee grounds as a low-cost adsorbent.

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