Home – Home – Jornals – Chemistry for Sustainable Development 2017 number 3

This paper proposes a new approach to the development of new sorption materials designed for extraction of compounds of high toxic heavy metals from wastewater, pollution by which is of global environmental problem. To obtain new sorbents it is proposed to use large-tonnage wastes of wood chemistry, i. e ., lignin, organochlorine residues from epichlorohydrin production and the waste of processing of high sulphur crude oils and natural gas, elemental sulphur, which allows simultaneously solving the problems of waste disposal and wastewater treatment. The availability of sorption materials using lignin previously subjected to chlorine water was demonstrated. Sorbents containing 2.4-12.5 % of sulphur are formed in 91-93 % yields by the interaction between the product with different degrees of chlorination and sodium disulphide in hydrazine alkaline system. Their maximum opportunity for heavy metal removal (Ni, Zn, Cd, Pb, Hg, Cu, Co) from model solutions with initial metal ion concentration in solution of 5000 mg/L was explored. High sorption activity of the resulting materials was detected for all the studied metals. A new type of sorbents was also prepared when using chlorinated lignin (chlorine content of 5.7 %), sodium polysulphide (Na₂S_n, n = 1.5-4.0) and wastes from epichlorohydrin production, the main component of which is 1,2,3-trichloropropane (86.2 %). The materials obtained herewith contain from 18.3 to 65.0 % of sulphur and generally show higher sorption activity toward the studied metals than sorbents obtained without the use of organochlorine residues.