Removal of nitrate nitrogen from water by AC-Fe/Ni combining sodium hypochlorite
With the rapid development of industry and agriculture,the scope of nitrate nitrogen(NO3--N)pollution continues to expand and the pollution degree becomes increasingly severe.Therefore,it is of great significance to effectively remove NO3--N in water.In this study,iron/nickel bimetallic nanoparticles loaded activated carbon(AC-Fe/Ni)was prepared by a in-situ reduction method.Subsequently,the AC-Fe/Ni was combined with sodium hypochlorite for the NO3--N removal.The results show that AC-Fe/Ni could quickly reduce NO3--N.The removal rate of NO3--N reached 99.29％after 20 min of reaction,which was 40％higher than the AC-Fe,and the N2 selectivity increased by 8％.AC-Fe/Ni could effectively reduce NO3--N under both acidic and alkaline conditions,but alkaline condition was more conducive to the formation of N2.Reducing the AC-Fe/Ni dosage or increasing the initial NO3--N concentration decreased the removal rate of NO3--N.Coexist anions,cations and organic matter had no significant effect on the removal of NO3--N.The total iron released in the solution was only 0.28 mg·L-1 during the reduction process of NO3--N,and the total nickel concentration was less than 0.05 mg·L-1.At the same time,the combination of sodium hypochlorite could effectively remove NH4+-N in the effluent,and the residual NH4-N in the solution after 60 min of reaction was only 0.28 mg·L-1.
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