Removal of tetracycline from wastewater using pumice stone: equilibrium, kinetic and thermodynamic studies

Abstract

In this study, pumice stone was used for the removal of tetracyline (TC) from aqueous solutions. It was characterized by XRD, FT-IR, SEM and BET analyses. Cation exchange capacity of pumice stone was found to be 9.9 meq/100 g. Effect of various parameters such as solution pH (2–11), adsorbent dosage (0.5-10 g/L), contact time (2.5-120 min), initial TC concentration (5–300 mg/L) and temperature (20–50°C) on TC adsorption onto pumice was investigated. Also the adsorption of TC on pumice stone was studied as a function of Na+ and Cu2+ cations changing pH from 2 to 11 using batch experiments. The best removal efficiency performance was exhibited at adsorbent dosage 10 g/L, pH 3, contact time 120 min. Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm models were applied to the equilibrium data. The result has shown that the adsorption was favorable, physicochemical in nature and agrees well with Langmuir and Freundlich models. The maximum Langmuir adsorption capacity was found to be 20.02 mg/g. The adsorption behavior of TC on pumices stone was fitted well in the pseudo-second order kinetics model. Thermodynamic parameters calculated from the adsorption data at different temperature showed that the adsorption reaction was feasible, spontaneous and exothermic.

Removal of tetracycline using new biocomposites from aqueous solutions

“…where q e and q t (mg/g) are the amounts of TC ions adsorbed on the adsorbent at equilibrium and time t (min), I is the intercept, and k 1 (min −1 ), k 2 (g/mg min), and k d (mg/g min 0.5 ) are the rate constants of pseudofirst-order kinetic model, pseudo-second-order kinetic model, and intraparticle diffusion model, respectively [45]. The values of correlation coefficients (k 1 , k 2 , k d ), equilibrium adsorption capacities (q e,teo ) in these models, and initial sorption rate (h) are given in Table 4.…”

“…TC existed as cationic in strong acid solution at pH < 3.3, zwitter anions at 3.3 < pH < 7.7, and negative ions at pH > 7.7 [45]. Optimum experimental pH value was determined as 6 and TC molecules have negative and positive charge at this pH.…”

“…All isotherm graphs were plotted using Sigmaplot 11 software [45]. The applicability of both Langmuir and Freundlich isotherms on the adsorption of TC into biosorbent shows that the adsorption occurred at both specific localized sites on a homogeneous surface by the monolayer formation of an adsorbate onto: firstly, the adsorbent surface; and secondly, the reversible heterogeneous surface consisting of different adsorption energies at the adsorption sites [42].…”

Adsorption of tetracycline antibiotics from an aqueous solution onto graphene oxide/calcium alginate composite fibers

“…Since most antibiotics are poorly metabolized and absorbed by the treated humans and animals, large fractions are excreted through urine and feces as an unmodied parent compound. 3,4 The widespread use of antibiotics has caused a variety of potential adverse effects such as chronic toxicity, lowering of human immunity, 5 and dissemination into antibiotic-resistant genes. 6 Antibiotic pollution poses a potential threat to human health.…”

Removal of Tetracycline and Tetracycline Resistance Genes from Municipal Wastewater in Microcosm Fill-and-Drain Constructed Wetlands

“…The results clearly indicate the strong adsorption affinity of red soil materials for TC. Bao et al (2008) 24) and Guler and Sarioglu (2014) 25) have also revealed the high adsorption ability of red soil and pumice stone for TC. In this flask experiments, TC removal by soil material was more rapid compared to microcosm-scale CW experiments (Table 2).…”