Oxidized Biomass and Its Usage as Adsorbent for Removal of Heavy Metal Ions from Aqueous Solutions

• Published in: Molecules (Basel, Switzerland) Vol. 27; no. 18; p. 6119
• Main Authors: Condurache, Bogdan-Constantin, Cojocaru, Corneliu, Samoila, Petrisor, Cosmulescu, Susana Felicia, Predeanu, Georgeta, Enache, Andra-Cristina, Harabagiu, Valeria
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 19.09.2022; MDPI
• Subjects: Adsorption; Aqueous solutions; Binding sites; Biomass; Biomass burning; Cadmium; Cations; Chemical elements; Copper; Economic development; Fibers; Free energy; Gibbs free energy; heavy metal ions; Heavy metals; Hydrogen-Ion Concentration; Infrared spectroscopy; Investigations; Isotherms; Keratin; Kinetics; Lead; Metal industry wastewaters; Metal ions; Metals; Metals, Heavy - chemistry; Morphology; Nitrogen; oxidized wool; Refuse and refuse disposal; Romania; Scanning electron microscopy; Spectroscopy, Fourier Transform Infrared; Spectrum analysis; Thermodynamics; Wastewater; Wastewater - chemistry; Water; Water Pollutants, Chemical - chemistry; Wool; Romania; thermodynamics; oxidized wool; adsorption; kinetics; heavy metal ions
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules27186119

Nowadays, very coarse wool fibers are considered waste biomass and are discarded at random or burned. Therefore, it is of actual interest to valorize coarse wool fibers as utile products. In this sense, we report herein an environmentally-friendly process for the preparation of a new material based on oxidized wool fibers and designed for efficient adsorption of heavy metals from wastewater. The morphology and the structure of the obtained product were characterized by scanning electron microscopy (SEM) coupled with an X-ray energy-dispersive module (EDX) and by Fourier-transform infrared spectroscopy (FTIR). Likewise, the performances of the oxidized wool fibers for the adsorption of heavy metal cations (Cu , Cd , Pb ) from aqueous solutions were tested. The adsorption kinetics data were analyzed by applying the pseudo-first-order (PFO) and pseudo-second-order (PSO) kinetic models. The equilibrium of the adsorption process was investigated by using the Freundlich and Langmuir isotherm models. According to the Langmuir isotherms registered at 300 K, the maximum adsorption capacities of the oxidized wool were found to increase from Cu (9.41 mg/g) and Cd (10.42 mg/g) to Pb (30.71 mg/g). Consequently, the removal efficiency of metal ions was found to vary in the range of 96.8-99.7%. The thermodynamic parameters (e.g., enthalpy, entropy, and Gibbs free energy) were calculated and discussed.