Study On Methyl Orange And Tetracycline Adsorption And Catalytic Degradation By A New-type Mineral Material

Bio-refractory Organic Contaminations have the characteristics of high toxicity and not easy to degrade.With the development of industry and agriculture,more and more attention has been paid to the treatment of organic wastewater.The new mineral material?QE for short?is a multi-functional environmental remediation material.Due to its special material properties,is has been applied in the waste composting,polluted soil remediation,water purification,textile processin.Based on the characteristics of QE in the adsorption on organic pollutants and the catalytic decomposition of H₂O₂,the effects and mechanisms of synergistic degradation of organic pollutants were studied by combining both properties in this study.In this study,the characteristics of QE were studied by scanning electron microscope,electron microscope,X ray diffraction,infrared spectroscopy and thermal analysis.In order to study QE's behavior the on effect and mechanism of the adsorption tetracycline and methyl orange,the adsorption mechanism of QE on tetracycline and methyl orange were studied.The results showed that:1.The surface of QE was rough with irregular crystals,and the size of the crystal was 0.5-100?m.The main elements of QE was oxygen,silicon,as well as a certain amount of iron,carbon,calcium,potassium,sodium.The main object of QE was composed of albite,sodium feldspar,phlogopite,montmorillonite,zeolite and iron tremolite.The infrared absorption peak of QE is caused by the vibration of the skeleton of QE and the vibration of Si-O or Al-O,and the specific surface area of QE is25.41m²/g.The thermal stability of QE was perfect and the mass loss rate was only about 7%when heated to 1000°C.2.Quasi-second-order kinetic model can better describe the adsorption process of QE.Langmuir model better explains the adsorption behavior of tetracycline and methyl orange in QE.3.The degradation of tetracycline and methyl orange by QE as Fenton catalyst was affected by pH,temperature,H₂O₂ concentration and catalyst dosage.When the initial concentration of tetracycline was50mg/L,under the optimization conditions of degradation of tetracycline,QE of 3g/L,H₂O₂ of 30mM,pH of 2.0 and temperature of 25?.The removal rate of tetracycline could reach 90%in the reaction period of 12h.When the initial concentration of methyl orange was 50mg/L,under the optimization conditions of degradation of methyl orange,QE of 5g/L,H₂O₂ of 100mM,pH of 2.0 and temperature of50?.The removal rate of methyl orange could reach 99%in the reaction period of 40min.4.In the reaction system,the total iron ion concentration in solution increased with reaction time,while the concentration of Fe²⁺showed a trend of first increase and then decrease with the reaction time.After the reaction,the reaction system still contained a large amount of hydrogen peroxide;the inhibition of tert-butanol the production of·OH in the reaction system reduced the degradation of tetracycline.Finally,it was put forward that the mechanism of the degradation of tetracycline by QE was analyzed by homogeneous,heterogeneous and adsorption synergistic results.But for two kinds of organic pollutants degradation effect was different.Generally speaking,QE showed unique effects on both tetracycline and methyl orange with its outstandingThis research shows that by adsorbing capacity and the catalyst of for the synergistic heterogeneous Fenton reaction.The results obtained in this research would be very useful and provide theoreticla reference for the actual application in treatment to dispose of organic effluents with methyl orange,QE turns to be an applicablewith advanced oxidation technology.