Preparation Of Biomass-Modified Cobalt Ferrate Material For Aqueous Tetracycline Adsorption Properties

Tetracycline usage and discharge have resulted in a remarkable increase in antibiotic concentrations in water,posing a danger to the microbial diversity of the aquatic environment and human health.The key to the purification treatment of tetracycline using the adsorption method is to develop a stable and effective adsorbent.Materials made of magnetic cobalt ferrate,which have excellent chemical stability and fast magnetic separation properties,suffer from the limitations of poor adsorption capacity,low adsorption efficiency,and non-reusability.According to the current situation,the magnetic cobalt ferrate was used as the matrix,and biomaterials（dopamine hydrochloride and rice husk）were added to modify the cobalt ferrate.Therefore,the adsorption capacity of cobalt ferrate-base was improved,allowing for the rapid and efficient removal of aqueous tetracycline.The key findings are as follows:（1）Carbon and nitrogen co-doped yolk-shell cobalt ferrate nanostructures（CN-Co Fe₂O₄）were successfully synthesized using dopamine modified cobalt ferrate-based,useful for adsorbing tetracycline pollutants from water,methods of hydrothermal and high-temperature calcination.The optimal synthesized conditions could be adjusted by hydrothermal temperature and the addition of dopamine hydrochloride in the experimental preparation of materials.The best scheme for the fabrication of adsorption materials was found at a hydrothermal temperature of 180°C and the addition of dopamine hydrochloride at 0.15 g.And the performance of adsorption towards tetracycline was also systematically studied.The spent adsorbent can easily be regenerated and retains 87.24%of its adsorption capacity even after five repeated uses.The adsorption kinetics and equilibrium of TC onto the CN-CFO could be well fitted by the Langmuir model and linear pseudo-second-order kinetic model.The adsorption process was spontaneous,chemisorption,comparatively speedy,and endothermic.The monolayer adsorption capacity of TC onto the CN-CFO was 147.98 mg·g^-1（30℃）,which showed good adsorption performance.The adsorption thermodynamics of tetracycline adsorbed by CN-CFO showed that the reaction could be carried out spontaneously and that the reaction was endothermic.Electrostatic attraction,surface complexation,hydrogen bonding,and cation exchange were considered to be the main factors affecting the tetracycline binding capacity.（2）Converting the rice husk Si O₂ with cetyltrimethylammonium and n-butanol into synthetic RH-Si O₂ with an average size of 100.58 nm.The RH-Si O₂-Co Fe₂O₄ was composed of RH-Si O₂ and the magnetic cobalt ferrate-based synthetic,which is useful for adsorbing aqueous tetracycline pollutants.The optimal synthesized conditions could be adjusted by the addition mass of RH-Si O₂ in the experiment preparation of materials.The best scheme for the fabrication of adsorption materials was found to be the addition of RH-Si O₂ at 0.2g.And the spent adsorbent can easily be regenerated and retains 90.40%of its adsorption capacity even after five repeated uses.Moreover,the adsorption kinetics and equilibrium of TC onto the RH-SIO-CFO could be well fitted by the Langmuir model and a linear pseudo-second-order kinetic model.The adsorption process was chemisorption,a comparatively speedy and endothermic monolayer.The maximum capacity of tetracycline on the RH-SIO-CFO was 510.27 mg·g^-1（30°C）and the adsorption equilibrium could be reached within 3 min at the earliest,which are,respectively,3.4 and 40 times higher than that of the CN-CFO,indicating that the RH-SIO-CFO has excellent adsorption performance and fast adsorption capacity.The adsorption thermodynamics of tetracycline adsorbed by RH-SIO-CFO showed that the reaction could be carried out spontaneously and that the reaction was endothermic.Electrostatic attraction,surface complexation,hydrogen bonding,and cation exchange were considered to be the main factors affecting the tetracycline binding capacity.In conclusion,this study achieved the efficient and rapid adsorption of biomass modified cobalt ferrite material for aqueous TC and the high-value utilization of biomass waste rice husk,so as to reduce the pollution of antibiotics to water environment and improve the quality of people’s living environment.