Removal of tetracycline using new biocomposites from aqueous solutions

Abstract

A B S T R A C TThis study investigated the removal of tetracycline (TC) using polypropylene (PP), polystyrene (PS), Saccharomyces cerevisiae (Sc) yeast, and new types of sorbents such as polypropylene-S. cerevisiae (PP-Sc) and Polystyrene-S. cerevisiae (PS-Sc) biocomposites from aqueous solutions in a batch system. PP-Sc and PS-Sc are newly synthesized yeast immobilized polymers for the removal of TC. The experimental results showed that the maximum TC removal was obtained by using the PP-Sc biocomposite, which has a porous structure necessary for the adsorption process and live yeast is a good biosorbent that is necessary for the biosorption process. The experimental conditions were investigated as a function of pH (4-12), the TC amount (10-150 mg/L), the adsorbents amount (0.05-0.6 g/L), the temperature (25-55˚C), and the NaNO 3 amount (0.025-1 mg/L). The Freundlich and Langmuir adsorption isotherms were conducted to deduce the mechanism of the removal process and both of the results were compatible. The thermodynamic parameters for the removal process and the structure characteristics of PP-Sc, both before and after the TC removal, were determined. This study proved that the PP-Sc and PS-Sc biocomposites have different features than the original and can cause significant implications for environmental biotechnologies, in particular for the removal of TC.

Tetracycline removal from model aqueous solutions by pretreated waste Streptomyces fradiae biomass

“…Similar conclusions were made by Erşan [29], who found that the optimum pH for the removal of TC on free Saccharomyces cerevisiae biomass, immobilized biomass on polypropylene and polystyrene was 6.0. The values of the pH PZC were found to be 5.338, 5.495 and 5.416, respectively.…”

“…Erşan [29] studied the effect of adsorption time on TC adsorption on free and immobilized Saccharomyces cerevisiae biomass by varying the contact time from 2.5 to 240 min. At 100 mg L −1 initial TC concentration, 150 min optimum removal time was found, whereas a longer contact time (240 min) caused desorption [29]. Kip and Açıkel [30] reported that biosorption equilibrium during TC removal by Candida utilis immobilized on chitosan was reached for 240 min.…”

“…For Candida utilis biomass immobilized in chitosan, the maximum TC uptake was 2.309 mg g −1 (initial TC concentration 10-100 mg L −1 , pH 4, contact time 240 min) [30]. The maximum TC uptake capacities for free and immobilized Saccharomyces cerevisiae biomass were 14.830 and 18.346 mg g −1 , respectively (initial TC concentration 10-150 mg L −1 , pH 6, biosorbent dosage 0.05 g L −1 , contact time 150 min) [29]. In the study of Sayğılı and Güzel [49] the equilibrium data for TC biosorption by tomato processing waste-activated carbon, were also represented by the Langmuir model, where the maximum biosorption capacity was 416.7 mg g −1 (initial TC concentration 200-800 mg L −1 , pH 5.8, biosorbent dosage 0.2 g L −1 , contact time 5 h).…”

“…To our best knowledge, little information on microbial biomass used as a biosorbent for TC removal has been reported. For example, Erşan [29] investigated the removal of TC, using Saccharomyces cerevisiae biomass immobilized on polypropylene and polystyrene from aqueous solutions in a batch system. Açıkel and Kip [30] studied TC adsorption using biocomposites prepared by the immobilization of Candida yeasts (Candida lipolytica, Candida membranaefaciens, Candida tropicalis, Candida utilis) and Rhizopus delemar fungus in chitosan.…”

R.delemar ve Candida Türlerinin İmmobilizasyonu İle Sentezlenen Biyokompozitlerle Tetrasiklin Giderimi

“…Bu yöntemle Monvisade and Siriphannon çalışmasında kitosana kil (montmorillonite) ilave ederek hazırlanan kompozitin (Kitosan-MMT) katyonik boyalardaki adsorpsiyonunu incelemişlerdir [14]. Erşan polistiren ve Saccharomyces cerevisiae mayası ile hazırladığı sorbentleri kullanarak tetrasiklinin (TC) adsorpsiyonu çalışmasında en yüksek giderim 150 mg/L derişiminde 8,76 mg/g iken yaptığımız çalışmada 100 mg/L derişimde kitosan-Candida utilis biyokompozitinin TC adsorpsiyon kapasitesi pH 4'de 1,179 mg/g olarak bulunmuştur [15]. Atık sulardan ve yüksek derişimli ilaç (antibiyotik) içeren çözeltilerden TC'nin uzaklaştırılmasında kullanılan alternatif bir yöntem olan immobilize edilmiş biyokompozit malzemelerdir.…”