Degradation Of Tetracycline In Water By Gas-liquid Plasma In Conjunction With RGo-TiO₂ Nanocomposite

Antibiotics are a small class of PPCPs(Pharmaceutical and Personal Care Products)in the environment.China belongs to a large population,and in animal husbandry and aquaculture industry is relatively developed,production and usage of antibiotics in the world,which leading to human and ecological influence,such as the problem of human ecological imbalance on drug resistance,etc.How to deal effectively with antibiotics in water which has become a current research focus,this paper uses gas-liquid plasma cooperated with r GO/Ti O2 degradation of tetracycline,and study the mechanism of degradation.In order to exclude the effect of adsorption on degradation,tetracycline was adsorbed by r GO/Ti O2 in water.The results showed that the adsorption behavior of r GO/Ti O2 was consistent with the pseudo two order kinetic model and the Langmuir isothermal model.And the adsorption behavior is a spontaneous and endothermic reaction.The discharge characteristics of plasma are studied and the active substances produced in the discharge process are quantitatively measured.When the plasma discharge is about 1.6 ms a cycle,the voltage in the reactor will decrease suddenly and the current will increase rapidly.At this point,a large amount of plasma will be produced in the solution.The presence of active groups in the solution was proved by spectroscopic examination of the active substances produced by the plasma.The degradation of tetracycline in water was studied by gas-liquid phase plasma.The results show that in a certain range,the degradation efficiency of tetracycline increases with increasing discharge power;reduce with the increase of initial concentration of solution.Under the different discharge gas conditions,reactive substances produced by different amount.In oxygen conditions most,followed by air,finally is argon,which through spectral analysis also verified this conclusion.The determination time has a important impact to degrade the tetracycline which due to the reactive substances were present in solution after plasma discharge.And high conductivity is good for degradation of tetracycline.By Fourier transform infrared spectroscopy of graphene oxide and graphene supported titanium dioxide(FT-IR),X ray diffraction(XRD),X ray photoelectron spectroscopy(XPS)and scanning electron microscopy(SEM)and transmission electron microscopy(TEM)characterization which showed that the Ti O2 successful load onto the surface of graphene.At the same time,the effects of plasma conjunction with light catalytic technology of various factors on the degradation of tetracycline.The results showed that the degradation rate of tetracycline was higher in synergetic degradation system than in single discharge system.The synergistic degradation products and routes of tetracycline were analyzed by mass spectrometry.