Study of lignite as the raw material for adsorption of Pb(II) and Cd(II) ions from aqueous solution

• Autorzy: Thaçi Bashkim , Gashi Salih , Podvorica Fetah , Sopaj Flamur , Hasani Gentiana , Veseli Albana , Prado-Roller Alexander

Identyfikatory

DOI

10.24425/aep.2025.156007

• Języki publikacji: EN

Abstrakty

EN

The adsorption of two heavy metal ions, lead and cadmium, from an aqueous solution was investigated using Kosovo's lignite as the raw material. The material's properties, including nature, functional groups, surface shape, and charge, were investigated using FTIR, XRD, SEM, and pHPZC techniques. The objective of determining parameters such as initial concentration, pH, contact time, adsorbent dosage, and temperature was to understand how these variables influence adsorption. Under optimal conditions (0.125g/50cm³, 30 mg/dm³, 30 min, 200 rpm, and pH 6), Tthe removal efficiency of Pb(II) was 97.22 %, and 90.04% for Cd(II) under optimal conditions (0.125g/50cm³, 30 mg/dm³, 30 min, 200 rpm, and pH 6). To investigate the achievement of equilibrium between lignite and metal ions, two key isotherm models, Langmuir and Freundlich, were applied. Based on the Langmuir isotherm model, the maximum adsorption capacities for lead and cadmium were 55.55 mg/g and 48.78 mg/g, respectively, at 288 K. The best medium for removing metal ions from lignite (desorption) is was found to be 0.5M HCl. Standard enthalpy change, standard entropy change, and Gibbs free energy indicated that the adsorption of heavy metals with onto lignite is a favorable, exothermic, and spontaneous process and is spontaneous. This investigation study shows that this lignite from Kosovo is highly effective in adsorbing lead and cadmium these two heavy metalsfrom aqueous solutions.

Słowa kluczowe

EN

adsorption isotherms; cadmium; adsorption; lead; lignite; thermodynamic parameters

PL

kadm; węgiel brunatny; adsorpcja; ołów; parametry termodynamiczne; izotermy adsorpcji

• Wydawca: Institute of Environmental Engineering, Polish Academy of Sciences
• Czasopismo: Archives of Environmental Protection
• Rocznik: 2025
• Tom: Vol. 51, no. 3
• Strony: 31--39
• Opis fizyczny: Bibliogr. 30 poz., fot., tab., wykr.

Twórcy

autor

Thaçi Bashkim

• University of Prishtina, Kosovo

• https://orcid.org/0000-0001-6964-7978

autor

Gashi Salih

• Academy of Sciences and Arts of Kosovo, Kosovo

autor

Podvorica Fetah

• University of Prishtina, Kosovo

autor

Sopaj Flamur

• University of Prishtina, Kosovo

autor

Hasani Gentiana

• University of Prishtina, Kosovo

autor

Veseli Albana

• University of Prishtina, Kosovo

autor

Prado-Roller Alexander

• University of Vienna, Faculty of Chemistry, Deputy Head X-RAY Centre, Austria

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025).