Macropreparation Of Photocatalyst TS-1 And Its Application For Antibiotic Degradation

Antibiotics are extensively utilized as common medicinal and veterinary drugs for the prevention and treatment of diseases in humans and animals.However,their incomplete absorption and metabolism in living organisms result in continuous excretion into the ecosystem,posing threats to human health and the ecological environment.Photocatalysis technology,an emerging water treatment approach,is rapidly advancing due to its efficient,cost-effective,environmentally friendly,and low-impact characteristics.Titanium silica molecular sieve（TS-1）,widely employed in industrial catalysis,exhibits strong adsorption,high hydrothermal stability,excellent mechanical stability,and acid resistance.Furthermore,TS-1 possesses high photo-reactivity,making it highly promising for industrial applications in the field of photocatalytic wastewater treatment.Nonetheless,the synthesis of TS-1 encounters challenges such as high costs,energy consumption,and pollution,significantly impeding its application in water treatment.Hence,this study aims to synthesize mesoporous TS-1 through light-assisted,scaled-up investigations for the photocatalytic treatment of antibiotic-mimetic wastewater.The findings will contribute to the practical implementation of related technologies and serve as a valuable reference for the industrial synthesis of this catalyst.The thesis focuses on two primary research aspects.（1）Research on catalyst degradation of antibiotic systems:A green,environmentally friendly,and cost-effective light-assisted method was employed to carry out the in situ synthesis of mesoporous TS-1 photocatalyst.The catalyst’s physical and chemical properties were analyzed using SEM,XRD,TEM,XPS,FTIR,UV-Vis,PL,photocurrent,electrical impedance,and other characterization techniques.The mechanism behind the synergistic synthesis of high crystallinity TS-1 molecular sieve using the photoassisted method with the mesoporous templating agent F-127 was extensively elucidated,along with the analysis of the catalyst’s photoelectric properties.The prepared catalysts were applied to the UV-catalytic treatment of simulated erythromycin（ERY）wastewater.The study investigated the influence of initial antibiotic concentration and catalyst concentration on ERY removal to determine the experimental conditions that yielded the highest removal rate（98.05%）.Additionally,the effects of environmental factors such as solution p H,common cations,and anions on the photocatalytic removal efficiency were examined under these optimal conditions.The results revealed minimal impact of environmental factors on the photocatalytic reaction,highlighting the catalyst’s high adaptability and its potential for industrial-scale application in the photocatalytic treatment of trace antibiotic wastewater.（2）Macroscopic preparation of catalysts:The mesoporous TS-1 catalyst and Bi₂O₃/TS-1composite photocatalysts were successfully synthesized on a larger scale,building upon the findings from small-scale laboratory trials.By scaling up the quantities of reactants under known optimal synthesis conditions,efforts were made to minimize the impact of scaling on catalyst properties.This involved designing a new experimental synthesis device and optimizing process conditions.The catalyst properties were characterized using SEM,XRD,TEM,FTIR,UV-Vis,and other analytical techniques.The amplified synthesized mesoporous TS-1 exhibited agglomerated particles with uniform size,and its specific surface area was significantly larger than that of the small-scale trial.As for the amplified synthesized Bi₂O₃/TS-1 composite photocatalyst,its properties remained consistent with those observed in the small-scale trial.The photocatalytic degradation experiments of the ERY solution under UV light were conducted to assess the photocatalytic performance of the amplified materials obtained.While the difference in the removal effect between the amplified mesoporous TS-1 from the scale-up experiment and the small-scale test was not significant,variations were observed in the adsorption effect.These differences could be attributed to variances in physical and chemical properties of the amplified TS-1,such as morphology and specific surface area.Conversely,the photocatalytic performance of the amplified Bi₂O₃/TS-1 composite photocatalyst for ERY remained largely unchanged compared to the small-scale test,with the total removal rate consistently maintained above 90%.This study demonstrated that photocatalytic materials synthesized under appropriate conditions remained stable and retained their effective photocatalytic performance for ERY.The findings of this research provide a solid theoretical foundation and serve as a process reference for achieving the industrial-scale production of photocatalysts.