A Study of the Sorption of Heavy Metals from Aquatic Solutions by Sorbents Based on Cellulosic Waste

This scientific research studies the sorption capacity of cellulose-containing sorbents based on fir sawdust in relation to zinc ions with a concentration of 0.01-0.05 mol/l. The content of cellulose in fir sawdust was determined. The sorption capacity of non-activated sawdust and modified with sodium hydroxide solutions of various concentrations is considered as sorbents. It was found that sorbents modified with 1.5M NaOH solution have the greatest sorption capacity. The maximum degree of extraction for these sorbents is observed for a concentration of 0.01 mol/l zinc ions and is 78.9%. The toxicity of heavy metals has a negative impact on ecosystems as a whole, negatively affecting the life cycle of organisms ranging from microorganisms to animals. Increased toxic concentrations of heavy metals cause numerous negative effects in the human body. For example, long-term intake of high doses of zinc may increase the risk of developing Parkinson's disease. Therefore, water purification is an urgent step has to be used to preserve environmental sustainability. The aim of this project is to study the process of sorption of zinc ions by cellulose-containing sorbents. Hypothesis : The use of activated cellulose-containing waste can reduce the concentration of heavy metals, in particular zinc, in aqueous solutions. Research stages : The main stages include: sampling and preparation for the analysis of fir sawdust; determination of the cellulose content in fir sawdust, production of activated sorbents and study of sorption processes using zinc solutions of various concentrations as an example, calculation of the degree of zinc extraction and construction of adsorption isotherms; analysis of experimental results. Methods used to implement the project : theoretical – methods of analysis of literary sources; empirical–methods of observation, comparison, chemical methods of analysis; methods of mathematical data processing. Practical significance : the use of cellulose-containing waste as a sorbent. Degree of independence : The sorption capacity of cellulose-containing sorbents based on fir sawdust in relation to zinc ions with a concentration of 0.01-0.05 mol/l has been studied. The content of cellulose in fir sawdust was determined. It was found that sorbents modified with 1.5M NaOH solution have the greatest sorption capacity. The maximum degree of extraction for these sorbents is observed for a concentration of 0.01 mol/l zinc ions and is 78.9%.