Preparation Of Nanometer Fe/Co Catalyst And Study On Degradation Of Oxytetracycline

The water around the world is polluted by antibiotics.The current biological treatment method is mainly used the activated sludge.As the antibiotics in the water will inhibit the life activity of microorganism,the biological method can not realize complete and effective degradation of waste water with antibiotics.The physical method can only transform antibiotics from one phase to another phase but can not realize the real degradation of the antibiotics.Although the fenton-like oxidation technology can realize good effect in the degradation of toxic,harmful and organic pollutants that are difficult to be degraded,they also have some disadvantages.For example,the reaction is limited by pH and the catalytic activity is not high.Therefore,the key study direction of current fenton-like technology is to develop and prepare the fenton-like catalyst with wide pH application range,high catalytic performance,good stability and long service life.In this study,nano Fe/Co catalyst was used to degrade oxytetracycline-containing wastewater and provide theoretical support for antibiotic-containing wastewater treatment.In this paper,Fe and Co were selected as active elements to study the influence of preparation factors on the structure and catalytic performance of the catalyst and optimize it.The effects of initial pH value,hydrogen peroxide dosage,initial concentration of oxytetracycline,and catalyst dosage on the catalytic performance and reusability of the catalyst were studied.The preparation cost and treatment cost of catalysts were studied.The main conclusions of the essay are as following:(1)The particle diameter of the catalyst prepared by liquid-phase reduction method and calcination method can be effectively reduced and the particle dispersion and the specific surface area of the catalyst can be greatly improved.(2)The nano Fe/Co catalyst and activated carbon supported nano Fe/Co catalyst will create good catalytic degradation effect on the oxytetracycline and can effectively expand the pH application range of the catalyst.When pH value is among 3.0 to 11.0,the nano Fe/Co catalyst can realize 89.3%～94.0%OTC removal and the activated carbon supported nano Fe/Co can realize 97.9～99.6%OTC removal.(3)Co has Lewis acid site.It can make the Fe3+become unstable by attracting the electron density in the iron center and then promote the reduction of iron ion in H2O2.In this way,the pH application range can be expanded in the reaction system.(4)The preparation cost of nano-Fe-Co catalyst was 9.4 ￥/kg,and the treatment cost of oxytetracycline wastewater was 61.3 ￥/m3.The preparation cost of nano-Fe-Co catalyst supported on activated carbon was 17.0 ￥/kg,and the treatment cost of oxytetracycline wastewater was 70.4 ￥/m3.