Adsorption Performance Of Tetracycline By Biomass Carbon And GO/TiO₂ Composites And Their Regeneration Capacity

The extensive use of Tetracycline?TC?has caused the persistence of antibiotic residues in aquatic environments,resulting in serious threat to human health and ecosystems.In this paper,tetracycline was adsorbed by biochar derived from chestnut shell and titanium dioxide/Graphene oxide?GO-TiO₂?.Dielectric barrier discharge plasma?DBD?was used to degrade the tetracycline on saturated adsorbents,so as to completely remove the tetracycline and recycle the adsorbents.In this research,biochar was prepared from chestnut shell.The modification method of biochar was carried out by hydrothermal method,that has a simple modification by phosphoric acid?H₃PO₄?at different activation temperatures were used as adsorbents for the removal TC from aqueous solution.The aim of this research was to evaluate the effect of modified chestnut shell on the sorption of TC in aqueous.Adsorption studies were investigated by varying contact time,solution pH,ionic strength,initial uranium concentration.Material characterization was carried out using the X-ray diffraction?XRD?,X-ray photoelectron spectroscopy?XPS?,scanning electron microscopy?SEM?,thermo gravimetric analysis?TGA?.The biochar after chemical treatment has a significantly higher adsorption capacity than the raw chestnut shell.The chestnut shell modified by phosphoric acid at 150°C sorption capacities ranking highest in all results.Surface morphological features and phosphorus-containing groups may have significantly contributed to the observed TC removal efficiencies.Conditions such as time,temperature,pH and ionic strength have a significant effect on adsorption efficiency.After DBD plasma degradation,it still maintains good adsorption capacity and can be recycled for many times.Thus,CS-HPs is an environmental friendly and low-cost sorbent for TC removal.Graphene oxide loaded with titanium dioxide composites?GO-TiO₂?prepared from graphite that has a hydrothermal modification by tetrabutyl titanate at high temperatures were used as adsorbents for the removal of tetracycline?TC?from aqueous solution.In this study,the adsorption of modified oxidized graphene on TC in aqueous solution was evaluated by changing the contact time,solution pH,initial TC concentration and ionic strength.Material characterizations were carried out by using the X-ray diffraction?XRD?,X-ray photoelectron spectroscopy?XPS?and scanning electron microscopy?SEM?in details.Experimental results show that the GO-TiO₂ composites have significantly high adsorption capacity on TC and the best performance is at pH around 4.The adsorption process is proved to be a monolayerchemical adsorption with spontaneous nature.The degradation of TC on the surface of saturated GO-TiO₂ by plasma was also studied.The experimental results show that the saturated GO-TiO₂ after plasma treatment restores its adsorption capacity for TC,and the regenerated GO-TiO₂ can still exhibit higher adsorption capacity for TC in solution.Compared with biochar materials?CS-HPs?and graphene oxide raw materials,TiO₂ supported by the material has higher recycling efficiency due to the catalytic effect of TiO₂,It is due to the catalysis of TiO₂ that TC is fully degraded.