Study On Catalytic Degradation Of Persistent Organic Pollutants Fluorene In Water

With the national "water ten" promulgated and implemented,water pollution control and governance has been urgent.Polycyclic aromatic hydrocarbons(PAHs)are persistent organic pollutants(POPs)that are carcinogenic,teratogenic,mutagenic and biodegradable,and are one of the most common organic pollutants in the environment.Persistent organic pollutants have been highly regarded by national environmental authorities and academics,and have become the core research area of global environmental problems.In this paper,the preparation and characterization of nanometer zero valent iron,Fe-Cu bimetallic,Fe-Ni bimetallic,the removal experiment of fluorene,the kinetic fitting,Fluorene charge distribution and theoretical calculation of electron cloud density and digestion and understanding of the study.The study concluded that:Fe-Cu bimetallic and Fe-Ni bimetallic,the maximum removal rate of fluorene was73.5% of nano-zero valent iron,89.5% of Fe-Cu bimetallic,Fe-Ni bimetallic 91.1%.The optimum combination of zero-valent iron,nano-zero-valent iron and Fe-Cu bimetallic was 2g/L,the fluorene concentration was 1.0mg/L,the temperature was 30?,the pH value And the removal rate was 70.5%,76.8% and 96.5% respectively.The optimum composition of Fe-Ni bimetallic was Fe/Ni bimetallic amount of 3g/L,fluorene concentration of 0.5mg/L,temperature of 30?,PH value of 5,the removal rate of 98.2%.The first-order kinetics equation fitting and the second-order kinetics equation fitting were carried out for zero-valent iron,nanometer zero-valent iron,Fe-Cu bimetallic and Fe-Ni bimetallic additions respectively.The results showed that zero-valent iron,Fe,Fe-Cu bimetallic and Fe-Ni bimetallic do not accord with the first-order kinetics equation,which is in good agreement with the second-order kinetic equation.The adsorption rate constant decreases with the initial concentration of fluorene,The initial concentration increases.The calculated molar ratio of the external charge of the benzene ring to the number of hydrogen atoms is larger than that of the hydrogen atom,and it is easy to form a chemical bond with the hydrogen atom,and it is easier to adsorb the hydrogen atom,so that one of the benzene rings undergoes the reduction reaction.At the same time,The compound formed a large?bond,by the external hydrogen ion attack,the bad stability is destroyed,easy to hydrogen ion addition reaction.The removal of fluorine,zero valent iron,nano zero valent iron and Fe-Cu double metal is mainly physical adsorption,Fe-Ni bimetallic catalytic digestion effect occurred on Fluoreneremoval,one benzene ring is completely reduced to generate 1,2,3,4,4a,9,9a-6H-1Hhydrogen fluorene.