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.
Highlights
The most environmentally sound technologies with high efficiency include methods of sorption wastewater treatment
Due to the fact that PN contains a certain amount of cedar oil, the surface of the material has hydrophobic properties. This prevents the penetration of the aqueous solution into the PN particles and makes the methylene blue (MB) extraction process ineffective
To degrease the surface of the PN particles and to increase their hydrophilicity, PN was treated with a 10% NaOH solution for a specified time
Summary
The most environmentally sound technologies with high efficiency include methods of sorption wastewater treatment. The main criterion for choosing a sorption material for wastewater treatment is its sorption properties, porous structure and profitability. Different brands of activated carbons during sorption of heavy metal ions have a greater or lesser absorption capacity. The main factor, that determines the cleaning efficiency of the sorption method, is the pH value. At pH = 4, sorption maximum is reached, i.e. the process goes to the formation of hydrolysis products. Granulated activated carbon, saturated with nitrohumic acid, has a high absorption capacity towards to heavy metal ions.
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