Immobilization of Hexavalent Chromium Using Self-Compacting Soil Technology

Zymantas Rudzionis; Arunas Aleksandras Navickas; Gediminas Stelmokaitis; Remigijus Ivanauskas

doi:10.3390/ma15062335

Immobilization of Hexavalent Chromium Using Self-Compacting Soil Technology

Materials (Basel). 2022 Mar 21;15(6):2335. doi: 10.3390/ma15062335.

Authors

Zymantas Rudzionis¹, Arunas Aleksandras Navickas¹, Gediminas Stelmokaitis¹, Remigijus Ivanauskas²

Affiliations

¹ Faculty of Civil Engineering and Architecture, Kaunas University of Technology, Studentų Str. 48, 51367 Kaunas, Lithuania.
² Faculty of Chemical Technology, Kaunas University of Technology, Radvilėnų pl. 19, 50254 Kaunas, Lithuania.

Abstract

A study of immobilization of hexavalent chromium in the form of Na₂CrO₄ salt by self-compacting soils (SCS) is presented. Carbofill E additive was used as SCS binder. The efficiency of immobilization of Cr (VI) was evaluated by washing out chromium compounds from SCS samples. The influence of the nature of the soil and the content of Carbofill E and Na₂CrO₄ in the SCS samples on the efficiency of Cr (VI) immobilization was studied. It was found that the nature of the soil and the content of Carbofill E in the SCS samples affect the immobilization of Cr (VI). Moreover, increasing the Carbofill E content in SCS samples further increases Cr (VI) immobilization. X-ray diffraction studies of the samples with immobilized hexavalent chromium showed that part of the sample transforms from a readily soluble form of salt into oxide forms of chromium and calcium-chromium, which are practically insoluble in water.

Keywords: hexavalent chromium; immobilization; self-compacting soil.