The adsorption behaviour of triclosan onto magnetic bio polymer beads impregnated with diatomite
Hassan Rasoulzadeh, Amir Sheikhmohammadi, Esrafil Asgari, Bayram Hashemzadeh
Abstract
The decrement rate of triclosan (TCS) in aqueous solutions was investigated by adsorption onto alginate beads impregnated with magnetic diatomite (ABMD). The obtained results from the study of the ABMD adsorbent characterisation indicated the presence of sodium alginate, diatomite and Fe3O4 in the ABMD structure. The optimisation of data was done by the response surface methodology using R software. The second-order model was selected as the appropriate model (because of lack of fit ˃ 0.05 and also the higher R2 than the other models). The parameters of (pH, time and ABMD dosage) and (initial TCS concentration) indicated intensifying and reducing effects on the TCS adsorption onto ABMD, respectively. According to the obtained results from solver analysis, the maximum TCS removal (94.47) was achieved at pH of 9.18; initial TCS concentration of 3.54 mg L−1; contact time of 58.84 min and ABMD dosage of 0.15 g L−1. The TCS adsorption experimental data were good fitted with Khan model. The maximum adsorption rate of TCS per mass unit of ABMD was 2.9 mg g−1 (calculated by the Khan model). The pseudo-second-order model was found to agree well with the adsorption experimental data obtained for TCS.