Decomposition Of Tetracycline In Aqueous By Non-thermal Plasma With A Bi₂MoO₆ Nanocatalyst

Tetracycline(TC),as a potent antibacterial antibiotic,has been widely used in curing human and veterinary.However,it had initiate a series of risks of environmental problems and human health,which due to its ineffective metabolism and low absorption of the treated species.Non-thermal plasma technology,as one of the promising advanced oxidation processes(AOPs),has been widely applied to the field of environmental pollution control.In this research,the combined application of the non-thermal plasma with a Bi2MoO6 catalyst to treat tetracycline in aqueous solution was tentatively investigated,and the expanding corresponding experimental researches were evaluated in the processes.The nanoparticle y-Bi2MoO6 catalyst was synthesized by solvothermal method.The structure,morphology and composition of catalyst were analyzed by X-ray powder dirrfaction(XRD),scanning electron microscope(SEM),transmission electron microscope(TEM),specific surface area analyzer(BET),X-ray fluorescence spectrometer(XRF)and UV-Vis,which proved its nanometer material with high purity,high crystallinity,multi-layer and hole shape,multi-band response and mesoporous structure.TC,as a target pollutant,was degraded by corona discharge plasma with the catalyst and the condition of input power,pH value,initial concentration,the addition of catalyst dosage,etc.were investigated in this research.The results showed an effective synergistic effect to remove tetracycline under the plasma-catalyst system which the removal rate of 250 mL TC with 50 mg/L was enhanced from 61.9%to 96%in 24 min with the addition of Bi2MoO6 in the range 0-1.5 g/L.Meanwhile,it was investigated that lower initial concentration and the increase of input power and initial pH value could promote the degradation of TC,and the catalyst showed a lower adsorption,high sedimentation characteristics,good stability and repeated use.In the reaction system,the addition of catalyst could promote the effect of TC mineralization,which the removal of TOC could increased from 25%to 63%relative to the catalyst cooperated as 1.5 g/L.Meanwhile,the corresponding biochemical characteristics had certain improvement.The six intermediates were identified by Gaussian soft and LC-MS analysis in the plasma-catalyst reaction system,and the proposed degradation pathways were speculated on the basis of these results,which intended to provide a responsible theory basis for the technology of TC wastewater treatment.