The Fenton-like Degradation Of Sulfamethazine And Alachlor

With the rapid development of economy and the rapid growth of population,a large number of industry,agriculture and living wastewater have been discharged into the natural water bodies,exacerbating a shortage of water resources.Water pollution,on the one hand,will bring serious harm to human health;On the other hand,affect the quality and production of agricultural and industrial products,and thus cause serious economic losses which will hinder the long-term development of human society.Clean water is one of the most important elements to sustain life for all the living organisms on the earth.To this end,scientists around the world are committing to the water pollution control all the time,and have developed a variety of water treatment technologies.Traditional water pollution treatment technologies to some extent,can control the quality of the water resources,but there are still disadvantages that should be paid attention to such as high energy consumption,high cost and poor governance effect.Since the date that they were found,advanced oxidation technologies have received extensive attention around the world.Advanced oxidation technologies produce reactive oxygen species with strong oxidability,such as ·OH and SO4·-by utilizing some precursors like O3,H2O2,H2O and S2O82-.Then ·OH and SO4·-can react with organic pollutants,and even mineralize them into CO2 and H2O.First,we studied the degradation behavior of sulfamethazine in the Fenton-like system based on molecular oxygen activation induced by Fe2+/TPP complex.Through a series of single-electron processes,the Fe2+/TPP system can activate the oxygen to H2O2,and then H2O2 can react with Fe2+ to produce ·OH,which leads to the efficient degradation of sulfamethazine.Then we systematically studied the reaction mechanism of this Fenton-like system and the possible degradation pathway of sulfamethazine.Next,we exerted the characteristic that ascorbic acid can promote the Fe(?)/Fe(?)circle on the surface of iron oxide,and estabilished a novel Fe3O4/H2O2/AA Fenton-like system.We found that the participation of ascorbic acid can significantly improve the degradation efficiency of alachlor and then systematically studied the role of ascorbic acid.The results revealed that the strong reducibility of ascorbic acid can promote the Fe(?)/Fe(?)circle on the surface of Fe3O4 and then much more ·OH can be produced to take part in the degradation of alachlor.Finally we proposed the possible mechanism of Fe3O4/H2O2/AA Fenton-like system and the possible degradation pathway of alachlor.This study could deepen the insight on the Fenton-like degradation of sulfamethazine and alachlor,which could provide theoretical support for putting such water treatment technologies into practice.