| As a kind of antibiotics widely applied,etracycline antibiotics has become one of the most threatening harm to humans,even the entire ecosystem.In this study,a series of mesoporous RGO/Ti O2?P123?and RGO/Ti O2?PVP?composites were synthesized by sol-gel and ultraviolet radiation reduction method utilizing triblock copolymers PEO20PPO70PEO20?P123?and polyvinylpyrrolidone?PVP?as template,respectively.The photocatalysts were characterized and analysed by X-ray diffraction?XRD?,transmission electron microscopy?TEM?,raman spectroscopy,brunauer-emmett-teller?BET?,UV-visible diffuse reflectance spectroscope?UV-vis?,photoluminescence?PL?spectroscopy technology.The influence of different mass fractions of PVP on the reaction rate,photocatalytic and adsorption performance of the RGO/Ti O2?PVP?composites by selecting tetracycline hydrochloride as the target degrading substance was investigated.Besides,the similar research about reaction rate,photocatalytic and adsorption performance of GO with different mass fractions was also conducted here.Next,the effects of p H,Ca2+concentration of initial solution and different light sources on the catalytic properties of the materials were also taken into consideration.Moreover,RGO/Ti O2?11wt%PVP?and 6wt%RGO/Ti O2?P123?were used as samples to evaluate the cyclic stability of composites.The main results were summarized as follows:1.GO could be partially reduced to RGO by composites after UV light irradiated for 4h.The introduction of RGO could increase the dispersion of Ti O2,extend the range of visible light,prolong lifetime of photocarrier,improve photocatalytic efficiency and enhance its TTCH adsorption capacity.2.The introduction of PVP and P123 could increase the pore size,specific surface area,adsorption performance and photocatalytic activity of RGO/Ti O2composites.Compared with PVP,the block copolymer P123 owned better performance for the properties mentioned above of the composite materials.3.The composites maintained high photocatalytic performance under UV light and simulated sunlight.The highest photocatalytic activity were present by the RGO/Ti O2?11wt%PVP?and 6wt%RGO/Ti O2?P123?composites.When p H reached 7and the concentration of Ca2+was 100mg/L,degradation rate of TTCH exceeded94.34%and 97.58%under UV light,respectively.4.ThephotocatalyticreactionprocessofRGO/Ti O2?11wt%PVP?and6wt%RGO/Ti O2?P123?composites corresponded to the first-order kinetics model and the composites had excellent cycle stability. |
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