Synthesis Of Ternary Transition Mrtal Chalcogenide Nano-materials And Their Adsorption Performance For Antibiotics

With the rapid development of pharmaceutical industry and the growing concern for people’s health,the abuse of antibiotics was getting worse.The efficient removal of antibiotics from the water environment was a matter of urgency as residual antibiotics can pose a serious risk to aquatic ecosystems and human life.The adsorption method is considered as one of the promising treatment methods because of its advantages of simple operation,no secondary pollution,economy and environmental protection.In this paper,four ternary transition metal chalcogenide based adsorbents were prepared by modifying the metal composition and constructing high performance composites,and the adsorption performance and adsorption mechanism of the adsorbents for antibiotics in the aqueous environment were investigated to achieve efficient adsorption and removal of antibiotics from water.The morphology and structural composition of the adsorbent were analyzed by SEM,XPS,XRD,FT-IR and N₂adsorption-desorption,and the adsorption behavior and mechanism was studied by adsorption kinetics,adsorption thermodynamics,adsorption isotherms and adsorption stability experiments.This research works not only expanded the application field of ternary transition metal chalcogenide but also provided the reference for the development of adsorbents in the process of antibiotic water pollution treatment.1.Two ternary transition metal chalcogenide of two different metal compositions-Cu₂MoS₄ and FeMoS₄,had been successfully synthesized by solvothermal method.Cu₂MoS₄revealed a structure of messy stacked layered plates and rectangular tubes with better crystallinity,FeMoS₄ had an obvious layered structure of hierarchical stacked lamination form.The results of the adsorption experiments showed that Cu₂MoS₄ and FeMoS₄ had similar adsorption behavior,with maximum adsorption capacities of up to 1243.36 and 2274.27 mg/g for chlortetracycline（CTC）,respectively.The adsorption processes of Cu₂MoS₄ and FeMoS₄were following the pseudo-second-order kinetic model,the Langmuir and Temkin isotherm models,the adsorption process was also a spontaneous endothermic process.After 6 cycles,the adsorption removal rates of Cu₂MoS₄ and FeMoS₄ for CTC remained above 90%,with good material stability.2.CuFeS₂-BCN composites were prepared via the solvothermal method by compounding BCN with Cu FeS₂.The relevant characterization showed that granular Cu FeS₂ grew on the smooth lamellar surface of BCN.The CTC removal rate of Cu FeS₂-BCN was improved by350%and 26%compared to monomeric BCN and Cu FeS₂,with a theoretical maximum adsorption capacity of 1145.61 mg/g.The adsorption process of Cu FeS₂-BCN fitted well with the pseudo-second-order kinetic model and the Langmuir isotherm model,the adsorption process was a spontaneous endothermic process.After 6 cycles,the adsorption removal rates of Cu FeS₂-BCN for CTC remained above 90%,with good material stability.3.Cu₂MoS₄-D001 composite resin was prepared by encapsulating Cu₂MoS₄ on D001 by the solvothermal method using a strong acid-type cation exchange resin（D001）as the carrier.The relevant characterization results showed that Cu₂MoS₄ was successfully encapsulated on D001.The adsorption performance of the Cu₂MoS₄-D001 composite resin for tetracycline（TC）increased by 37%compared to the D001 resin,with a theoretical maximum adsorption capacity of 1360.54 mg/g.The adsorption process of Cu₂MoS₄-D001 conformed to the pseudo-first-order kinetic model and the Langmuir isotherm model fits well,the adsorption process was a spontaneous endothermic process.The dynamic adsorption results showed that the breakthrough and saturation points were 0.7 and 156 h respectively,and the breakthrough curves fitted the Thomas model well.After 6 cycles,the adsorption removal rate of Cu₂MoS₄-D001 for TC was only reduced by 5%,with good material stability.