Abstract: The absorption of nitrite and total ammonia nitrogen pollutants in simulation contaminated seawater by viscose-based carbon fibers(CF)modified by using nitric acid oxidation method was studied,and the absorption effects of the modified carbon fibers were optimized through orthogonal experiments including the modification time of carbon fiber,dosage of carbon fiber,initial concentration of nitrite and total ammonia nitrogen,time of absorption,and sea condition and pH value to search for an effective method of treatment of coastal seawater pollution and ecological restoration.The results showed that the adsorption performance of carbon fiber was stable under the same reaction conditions,and that the adsorption effect of carbon fiber on nitrite was good at the same time,with the relatively poor removal rate of total ammonia nitrogen.The best absorption of nitrite and total ammonia nitrogen and restoration of simulated coastal seawater by the viscose-based carbon fiber were observed under the optimal conditions of 3 hours absorption,sea level of 3,CF dosage of 0.01 g,initial nitrite concentration of 4 mg/L,initial total ammonia nitrogen concentration of 60 mg/L,modification for 1.5 h,and pH value of 8,with the removal rate of 84.56%for nitrite,and the total ammonia nitrogen removal rate of 45.63%.The findings provide the reference for the application of carbon fiber in the coastal marine environment restoration.
2017, Vol. 32 
