Assessment of the possibility of thermally expanded graphite application for polluted natural waters purification
Abstract
In the study sorption capacity of heavy metals by the thermally expanded graphite (TEG) based on graphite nitrate, cointercalated with ethyl formate and acetic acid, as well as possibility of TEG application for polluted natural water purification, was investigated. Adsorption isotherms based on the experimental values of the sorption capacity were described using the Langmuir model. The maximum values of the sorption capacity for the cations Cu2+, Mn2+, Zn2+ were determined, which are 0.064, 0.029 and 0.089 g/g of sorbent, respectively. It was shown that the nature of anion has no effect on the sorption of heavy metals from aqueous solutions of their salts. Tests of the studied TEG at a real object were carried out to substantiate the possibility of TEG application as a sorbent basis in the purification of polluted natural waters. The studies were performed using a sample of water with a high content of ecotoxicants from a surface source located in the city of Volgograd. After water treatment with the investigated TEG, the concentrations of ecotoxicants, in particular heavy metals, decreased to acceptable limits. Based on the results obtained, it can be concluded that the obtained TEG can be used as a sorbent for purification of natural and waste waters from pollutants and technogenic impurities.
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