Removal of Tetracycline in Sewage and Dairy Products with High-Stable MOF

Abstract

Serious environmental and human health problems caused by the abuse of antibiotics have attracted worldwide concern. Recently, metal–organic frameworks (MOFs) with high porosity have drawn wide attention for their effects in the adsorption and removal of pollutants from complex matrices. Herein, a high-stable metal organic framework (MOF), i.e., ((ZnCl2)3(L)2·DMF)n, where L=1,3,5-tris((pyridin-4-ylthio)methyl)benzene), MOF 1, was applied to adsorb and remove tetracycline from sewage and dairy products. The results showed that MOF 1 exhibited a strong performance in the adsorption of tetracycline. The effects of initial pH values, adsorbent dose, contact time and ionic strength of the adsorption performance of MOF 1 were investigated. The adsorption kinetics best fit the pseudo-second order model, and the adsorption isotherms matched the Langmuir adsorption model well. It was indicated that both chemical adsorption and physical adsorption play an important role in the adsorption process, and the adsorption of tetracycline was homogeneous and occurred on a monolayer on the surface of MOF 1. Additionally, the stability of MOF 1 and the details of the adsorption mechanism were also investigated. Thus, this study provides a new candidate for the application of MOFs-based adsorbents in the removal of antibiotics from sewage and dairy products.

Study on the Adsorption of CuFe2O4-Loaded Corncob Biochar for Pb(II)

“…The kinetic experimental data were treated using the first-order (Equation (10)), second-order (Equation (11)) and intraparticle diffusion models (Equation (12)) [ 56 ], respectively. Furthermore, typical isothermal experiments were performed using a group of Pb(II) solutions with different initial concentration at 30, 40, and 50 °C respectively.…”

Synthesis of magnetic nanocomposite Fe3O4@ZIF-8@ZIF-67 and removal of tetracycline in water

“…The effects of contact time, dosage, and pH were examined for two categories of experiments. The contact time was 20-180 min, the dosage was 5-40 mg, and the initial pH (3)(4)(5)(6)(7)(8)(9)(10)(11) was adjusted with 0.1 mM HCl or 0.1 mM NaOH. For the adsorption performance of Fe 3 O 4 @ZIF-8@ZIF-67, the initial concentration of TC (20-160 mg L − 1 ), the adsorption temperature (25-45℃), humic acid concentration (0-8 mg L − 1 ), and other adsorbents (activated carbon (AC), Fe 3 O 4 @ZIF-8, and nanometer zero-valent iron (nZVI)) were discussed.…”

“…The past three decades have witnessed an enormous growth in MOF research from synthesis to uses in adsorption, storage, separation and catalysis (Stock and Biswas, 2012). Numerous previous studies have shown that MOFs have an excellent effect on TC removal from wastewater with their large surface areas and high porosity (Li et al, 2020;Xiao et al, 2020). To date, most studies have focused on the use of MOFs as an adsorbent and little information is available on the performance and mechanism of TC removal from wastewater via synergetic adsorption and Fenton-like oxidation using magnetic-MOFs.…”

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

“…Stock TC solution (Sigma), 250 mg L −1 , was prepared with deionised water. For the biosorption experiments, TC solutions of different concentrations (25,50,75 and 100 mg L −1 ) were prepared by adequate dilution of the stock solution with deionized water. All solutions were prepared daily.…”

“…An attractive alternative to the methods listed above is adsorption, due to its simplicity, safety, economic feasibility, and removal efficiency at low sorbent concentrations. A wide variety of adsorbents have been studied for tetracyclines removal from aqueous solutions: carbon-based materials (biochar, activated carbon, carbon nanotubes, graphene) [16], silica [17], pumice stone [18], biopolymers (chitosan and modified alginate) [19,20], algae [21,22], metal-organic frameworks -MOFs [23][24][25], magnetic nanocomposites [26][27][28].…”