Abstract: The crystal structure and surface morphology of Li+-doped nanometer TiO2photocatalyst prepared via sol-gelmethod were characterized by XRD and SEM techniques.The photocatalytic degradation of seafood processing effluents simulated Dalian Heishijiao sea water was investigated by the Li+-doped TiO2in the simulated seawater.The factors affecting the degradation including doping content of Lithium,Li+-doped TiO2dosage,pH value, initial concentration of COD and ammonia-N were studied and the effect of presence of assistance oxidant peroxide on the COD and ammonia-N removal from sea food processing effluentswas investigated in an orthogonal test to optimize the photocatalytic degradation of seafood processing effluents.Itwas found that the Li+-doped nanometer titanium dioxide photocatalyst was characterized by high photocatalytic degradation of seafood processing effluents, and that the degradation was primarily influenced by purity and dosage of the Li+-doped nanometer titanium dioxide,pH value,and initial concentration of COD,addition of H2O2and ammonia-N.The best photocatalytic degradation of seafood processing effluentswas observed under conditions as:5%of lithium doping amount,ammonia nitrogen concentration of 80 mg/L,the initial COD concentration of 300 mg/L,Li+-TiO2dosage of 0.9 g/L,H2O2volume fraction of 5%,reaction time of 2 hours,and pH value of 8,with photocatalytic oxidation degradation rate of 81.50%in ammonia nitrogen and of 78.67%in COD.
2015, Vol. 30 
