Характеристика органофілізованого палигорскіту та його спорідненість до хроматів

Abstract

It is established that a change in the surface of palygorskite by cationic surfactants makes it possible to change the sorption properties of the mineral. The structure of Na-palygorskite and organoclay has been studied, the X-ray diffraction data are provided. Taking into account the change in the structure of Na-palygorskite and the synthesized organopalygorskites, it can be concluded that the main mechanism of adsorption of HDTMA is an electrostatic interaction with the negatively charged surface of palygorskite. It has been established that the HDTMA cations are incorporated into the structure of palygorskite by means of van der Waals forces. When a palygorskite HDTMA is added to the suspension in an amount exceeding the CEC of the mineral on the outer surface of the clay minerals, the surfactant forms a bichard coating, which leads to a surface recharge. The kinetics of Cr (VI) adsorption from an aqueous solution on synthesized composites, as well as the sorption properties of composites with respect to chromates, has been studied. Organopalygorskite is estimated as an effective sorbent for extraction of chromates with fast kinetics (equilibrium was established within 60 min) and high maximum adsorption (14.2 mg/g). This makes it expedient to use organopalygorskite as a sorbent for protecting aquatic environments.