| Tetracycline antibiotics are widely used in livestock and poultry breeding due to their low price and strong bacterial inhibition.However,due to their stable properties and strong hydrophilicity,they will inevitably enter the water environment.In this way,researchers have detected trace amounts of antibiotic pollutants in natural water bodies.Traditional water treatment technologies cannot effectively remove antibiotic pollutants in the water environment,and adsorption is often used as an effective post-treatment method to remove antibiotic pollutants such as tetracycline hydrochloride in water.The application of adsorbents can not only adsorb antibiotics in the water environment,thereby improving the quality of the water body,but also use desorption reagents to regenerate the materials,so as to achieve the effects of green and efficient treatment,simple process and low cost.In this paper,the solvent evaporation method was selected to synthesize attapulgite loaded ZIF-8(ATP-ZIF-8),and ATP-ZIF-8 was characterized by SEM,TEM,XRD,FT-IR,BET,TG,etc.Through the evaluation experiment of ATP-ZIF-8 on the adsorption performance of tetracycline hydrochloride in water,the adsorption mechanism of the new adsorbent on tetracycline hydrochloride in water was discussed,combined with the influence experiment of water quality parameters,dynamic adsorption experiment,recycling experiment and material characterization results to evaluate the material Adsorption performance of tetracycline antibiotic pollutants.The specific research work is as follows:A new type of adsorbent(ATP-ZIF-8)loaded with MOFs(ATP-ZIF-8)is designed and prepared for the adsorption of antibiotics in water.Studies have shown that the optimal addition amount of attapulgite in the preparation process is 0.4g.From the characterization results,it can be seen that attapulgite and ZIF-8 have surface interactions,so ATP is prepared by the combination of attapulgite loaded with ZIF-8-ZIF-8.The kinetic model,isotherm model and thermodynamics are used to explore the mechanism of ATP-ZIF-8 adsorption of tetracycline hydrochloride.The maximum adsorption capacity is 125.13mg/g.The adsorption process is more in line with the quasi-second-order kinetics and Langmuir adsorption isotherm model,and the reaction process is self-emitting.The adsorption mechanism is mainly electrostatic interaction,van der Waals interaction and π-π interaction.Using water quality parameters as influencing factors,the adsorption effect of ATP-ZIF-8 in practical application was explored.ATP-ZIF-8 has a wide range of p H adaptation(4～8).A small amount of Na Cl can promote the adsorption of tetracycline hydrochloride by ATP-ZIF-8;the introduction of different ions will change the p H of the system and form complexes with antibiotics in the solution.At the same time,it will affect the surface properties of ATP-ZIF-8 and make adsorption The efficiency is reduced;humic acid(HA)has a weak inhibitory effect on its adsorption effect.Will cause slight inhibition.The results of the dynamic adsorption experiment of ATP-ZIF-8 on tetracycline hydrochloride show that the mass ratio of the ATP-ZIF-8 filling amount(50mg)in the adsorption column to the passing tetracycline hydrochloride solution(concentration20mg/L)is about 1:5000.,The adsorption removal rate is 55.5%.Tetracycline hydrochloride on ATP-ZIF-8 can be eluted by methanol-water alternate washing method,and the adsorption removal rate after 5 cycles of adsorption can still reach60.96% of the initial adsorption removal rate.ATP-ZIF-8 has good dynamic adsorption performance and excellent cyclic adsorption performance. |
