Study On Degradation Of 1-naphthol By Activated Persulfate

Activated persulfate oxidation technology were widely used in soil and situ remediation of ground water and other fields. persulfate under certain conditions(heat, UV, transition metal ions, etc.) can be activated and produced a strong oxidizing sulfate free radicals. 1-naphthol is carcinogenic, teratogenic, sensitization, has potential toxicity, has great harm to humans and the environment, degradation of 1-naphthol is very necessary and meaningful. At present, the use of activated persulfate degradation of 1-naphthol rarely reported. Therefore, this paper used activated persulfate(PS) advanced oxidation process degradating 1-naphthol, degradation rate and TOC removal rate were investigated; degradation products and mechanism analysis was done to provide the basic data support for 1-naphthol treatment.Firstly, 1-naphthol was degradated by heat-activated persulfate. The results indicated that under the condition(1-naphthol initial concentration 100 mg/L, Activation temperature 60℃, PS dosage 1.65 g/L, p H 5.8) after 20 min, 1-naphthol degradation rate reached 59.28%, TOC removal rate 5.77%, 1,4-naphthoquinone was generated as degradation products.Secondly, 1-naphthol was degradated by different valence iron activated persulfate. The results show that: under the condition(p H 5.8, Fe2+ concentration 0.01 m M, 1-naphthol initial concentration 100 mg/L, PS dosage 1.0 g/L), after 20 min, 1- naphthol degradation rate was 87.22%, TOC removal rate was 6.21%, benzoic acid and 1,4- naphthoquinone were generated. Under the same conditions, seted Fe0 and Fe3+ concentration as 0.01 m M, 1-naphthol degradation rate was 66.01% and 59.65% respectively, compared the degradation rate of 1-naphthol, activation effect of different valence states were Fe2+> Fe0> Fe3+.In addition, the paper also used complex activation technique to degradate 1-naphthol. 1-naphthol was degradated by microwave and microwave and Fe2+ complexe activated persulfate, under the same conditions(microwave power 210 W, 1-naphthol initial concentration 100 mg/L, PS dosage 1.0 g/L, p H 5.8) added 0.004 m M Fe2+, after 10 min, 1-naphthol degradation rate and TOC removal rate was 100% and 26.52% respectively in MW+ PS+Fe2+, higher than in MW+ PS(degradation rate 73.15%, TOC removal rate 5.73%); 1-naphthol was degradated by UV and UV+Fe2+ complex activated persulfate, under the same conditions(immersed distance of UV lamp 9.5cm, 1-naphthol initial concentration 100 mg/L, PS dosage 1.5 g/L, p H 5.8), added 0.01 m M Fe2+, after 20 min, 1- naphthol degradation rate and TOC removal rate was 100% and 6.62% respectively in UV+PS+Fe2+, higher than in the UV+PS(degradation rate 87.22%, TOC removal rate 1.04%). Benzoic acid and 1,4-naphthoquinone were generated. Complex activation are superior to single activation.In summary, activated persulfate technology can effectively degrade 1-naphthol, and complex activation technique can be more effective degradation of pollutants.