Oxytetracycline sorption onto Iraqi montmorillonite

Abstract

This paper assesses the use of certified Iraqi montmorillonite clay as a potential sorbent for the removal of oxytetracycline (OTC) from aqueous solutions. The clay is characterized by a cation exchange capacity of 0.756 meq g -1 and a zero point charge at pH 8.7. Aqueous solutions of OTC were equilibrated with montmorillonite under various experimental conditions, such as OTC concentration, pH and clay content, for 24 h at fixed ionic strength. Two forms of montmorillonite were evaluated: regular and iron-modified form. The effect of pH was minor on OTC adsorption. Kinetic study revealed that the sorption follows a pseudo-second-order model. Sorption isotherm showed a good fit with the Freundlich model. OTC sorption onto Fe-saturated montmorillonite was analyzed statistically using a response surface design to study the effects of experimental conditions. The introduction of iron improved the adsorption characteristics of the clay due to the ability of ferric ions to make stable complexes with OTC. The most favorable operating conditions for the treatment were deemed as follows: clay content, 6.85 g L -1 , oxytetracycline concentration, 1.0 mmol L -1 and pH, 5.5 for the iron-modified form.

Preparation of amino-Fe(III) functionalized mesoporous silica for synergistic adsorption of tetracycline and copper

“…The rapid adsorption rate could be attributed to the rigid, open-pore structure as well as the large pore size of adsorbent, which increased the internal mass transfer in the adsorption process. Furthermore, the protonated amino group and Fe(III) inside the pore walls could provide abundant binding sites for Cu(II) and TC, respectively (Barbooti et al, 2014;Yang and Jiang, 2014). For the binary system, the presence of Cu(II) increased the adsorption rate of TC and enhanced the amount of absorbed TC to more than twice values in the absence of Cu(II) (Fig.…”

“…Metal grafting SBA15 shows high adsorption capacity in the removal of pharmaceutical drugs for water treatment (Rivera-Jimenez and Hernandez-Maldonado, 2008;Rivera-Jimenez et al, 2010). In connection with the ability of Fe(III) to form stable complexes with antibiotics (Barbooti et al, 2014), we proposed an adsorbent with dual functionalization of amino groups and Fe(III) based on SBA15, for synergistic removal of antibiotics and heavy metals, whereas few studies have thoroughly discussed.…”

Removal of sulfamethazine antibiotics using cow manure-based carbon adsorbents

“…Pharmaceutical antibiotics (PAs) are used widely in the livestock and poultry industries to improve the efficiency of feed use, promote growth rate, and reduce mortality and morbidity (Barbooti et al 2014). Because these PAs can bio-accumulate, they pose a long-term risk to aquatic and terrestrial organisms upon their release into the environment, even if the concentrations of PAs in nature are relatively low (range of lg/L to ng/L) (Bui et al 2013;Kümmerer 2009).…”

Design of Experiments for the Optimization of Biochemical Treatment of Tannery Wastewater

“…Delgado-Moreno et al [22] studied the extraction of triazines from soil after olive cake amendment. Experimental design was succesfully emplyed to evaluate the optimal conditions on the removal of oxytetracycline and heavy metals from water [23,24]. The systems presents a systematic approach for the effects of simultaneous variables at several levels and allows the evaluation of the applicability of the proposed model.…”