RETRACTED ARTICLE: Adsorptive removal of cadmium from aqueous media using Posidonia oceanica biomass: equilibrium, dynamic and thermodynamic studies

Abstract

Posidonia oceanica (L.), a marine biomass, has been used as an effective and efficient biosorbent for the removal of Cd(II) from aqueous media. The physicochemical properties of biosorbent were investigated by elemental analysis, BET surface area, FT-IR, SEM and EDX methods before and after adsorption. Batch adsorption experiments were carried out to investigate the effects of solution pH, dosage of biosorbent, contact time and temperature. The biosorbent exhibited the maximum uptake of 58.82 mg/g under the optimal adsorption condition. Kinetics experiments indicated that the pseudosecond-order model displayed the best correlation with adsorption kinetics data. Besides, experimental data could be better described by the Langmuir isotherm model. Desorption experiments were carried out to explore the feasibility of regenerating the biosorbent. The regeneration efficiency was 96.03 % using desorption agent of 0.2 M HCl. The thermodynamic parameters (DH 0 , DS 0 and DG 0 ) of the cadmium ion uptake onto P.O indicated that the process is endothermic and proceeds spontaneously. The findings of the present study indicate that P.O can be successfully used for separation of Cd(II) from aqueous solutions. The results suggested that the adsorbent is promising for use as an effective and economical adsorbent for Cd(II) ions removal.

Experimental in situ exposure of the seagrass Posidonia oceanica (L.) Delile to 15 trace elements

“…TEs biosorb on P. oceanica fibres, as shown for Cr by Ncibi et al (2008) and Krika et al (2012). Biosorption, even if more efficient at acidic pH, could also be relevant for many metals at natural seawater pH, as shown for the seaweed Sargassum spp.…”

Study on Natural Cellulosic Fiber From Posidonia Oceanica Waste: Characterization and Analysis

“…In addition, there is a small peak recorded at 34.8°, which might correspond to the presence of sodium metal [30]. XRD pattern of P. oceanica showed an amorphous nature of the biomass [31]. According to Scherrer's equation, full width at half maximum (FWHM) and crystallite size (L) were calculated as, 3.50 and 22.86 respectively, where k is 0.89.…”

Eu (III) 'un Narcissus Tazetta L. Yaprak Tozu Üzerine Biyosorpsiyonu

“…There were no significant changes observed before and after the biosorption process except a slight alteration in the intensity of some peaks. Despite the complexity of the biochemical properties of biosorbent [37], some studies have revealed that carboxyl and hydroxyl groups play a significant role in metal uptake [38].…”

“…Figure 1. FTIR spectra of N. Tazetta leaf powders before and after Eu(III) biosorption Leaves and stems of plants and trees contain lignin and cellulose which are mainly composed of hydroxyl, methoxyl and carbonyl groups.Despite the complexity of the biochemical properties of biosorbent[37], some studies have revealed that carboxyl and hydroxyl groups play a significant role in metal uptake[38].…”