Alkaline treatment of pine nutshells to improve the treatment of model water from dye methylene blue

Abstract

In the article presented the data on the possibility of using crushed pine nutshell to extract methylene blue dye from aqueous solutions. In Russia, in Siberia, located up to 80% of the world's reserves of Siberian cedar pine. Up to 12 million tons of pine nuts can be acquired annually, when processed into kernels or cedar oil, pine nut shell is formed as a waste, representing 51-59% of the nut weight itself. Despite proposed technological options for usage of pine nutshells, the issue of disposal of this material has not been fully resolved. One of the alternative options for the disposal of pine shells is obtaining sorption material for the extraction of pollutants from aqueous media. To improve the cleaning efficiency, the pine shell was treated with 10% NaOH solution. It was found that processing pine nutshells with 10% NaOH solution for 5 minutes at a temperature of 25 °C gives an improvement in cleaningefficiency of 96%, and an increase in the temperature of NaOH solution up to 97%. The recommended particle size of the pine nuts shell is less than 2 mm.