Adsorption of tetracycline using CuCoFe2O4@Chitosan as a new and green magnetic nanohybrid adsorbent from aqueous solutions: Isotherm, kinetic and thermodynamic study
“…7 a, when the content of TTC increased from 5 to 30 mg/L, the removal rate decreased from 90% to 32% (p-value < 0.05). This downward trend in the removal percentage can be explained by the saturation of the active sites of the adsorbent at high pollutant concentrations and, as a result, the lack of vacant sites on the surface of the composite [ 31 , 32 ]. Fig.…”
“…7 a, when the content of TTC increased from 5 to 30 mg/L, the removal rate decreased from 90% to 32% (p-value < 0.05). This downward trend in the removal percentage can be explained by the saturation of the active sites of the adsorbent at high pollutant concentrations and, as a result, the lack of vacant sites on the surface of the composite [ 31 , 32 ]. Fig.…”
“…The removal efficacy of our sorbent was higher than that reported in the literature utilizing CuCoFe 2 O 4 @Ch when applied to wastewater samples. 32 The results showed that the proposed method was highly effective and worked well in the presence of other ionic species and contaminants commonly found in actual water samples.…”
Section: Application To Real Water Samplesmentioning
confidence: 87%
“…The obtained results are in good agreement with prior literature data. 31 The Langmuir model is described by equation ( 3). The Langmuir equation relates the adsorption capacity of HPCR (q e , mg/g) to the concentration of TC in the solution (C e , mg/L) at equilibrium.…”
Section: Influence Of the Initial Tc Concentration And The Removal Is...mentioning
confidence: 99%
“…Therefore, the multilayer adsorption mechanism onto a heterogeneous surface defined by the Freundlich isotherm dominates the TC adsorption process, which agrees with the previous literature data. 32 According to this isotherm model, the maximum adsorption capacity was ca. 36.9 mg/g.…”
Section: Influence Of the Initial Tc Concentration And The Removal Is...mentioning
This study aims to investigate the adsorption characteristics of tetracycline from polluted waters using C-4-hydroxyphenylcalix[4]resorcinarene as an adsorbent. The adsorptive efficiency of C-4-hydroxyphenylcalix[4]resorcinarene is optimized by adjusting various operational parameters such as the adsorbent dosage, the pH, the contact time, the temperature, and the initial adsorbate concentration. The most efficient remediation is 96% at 10.0 mg/L tetracycline as the initial concentration, 0.05 mg/L C-4-hydroxyphenylcalix[4]resorcinarene, a contact time of 30 min, pH 5.6, and ambient temperature. The adsorption ability of C-4-hydroxyphenylcalix[4]resorcinarene toward tetracycline is also investigated in water with different characteristics, including solutions with and without the addition of background salts. The results show that C-4-hydroxyphenylcalix[4]resorcinarene can effectively remove tetracycline from aqueous solutions with an adsorption capacity of ca. 36.9 mg/g. The study also finds that the removal process followed pseudo-second order kinetics and Freundlich isotherm models. Moreover, the adsorption is spontaneous and exothermic, suggesting a thermodynamically favorable chemisorption process. In addition, the optimized method is successfully applied to remove tetracycline from various real natural water systems.
“…It has been reported that the dissociation constants of TC in water solution are pK 1 = 3.3, pK 2 = 7.68, and pK 3 = 9.69. 5,47 The molecular structure of tetracycline contains three ionizable functional groups: (a) tricarbonyl group, (b) phenolic diketone, and (c) dimethyl ammonium group. These groups ionize differently to form cations, zwitterions, and anions in aqueous solution (Fig.…”
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