Use of Thermally Modified Jarosite for the Removal of Hexavalent Chromium by Adsorption

• DOI: 10.3390/cryst12010080
• Publication Date: 2022-01-10T01:21:56Z
• Authors: N. Picazo-Rodríguez; F. Carrillo-Pedroza; Ma Soria-Aguilar; Gabriela Baltierra; Gregorio González; A. Martinez-Luevanos; Isaías Almaguer G...
• Keywords: Jarosite; Hexavalent Chromium; Chrome plating; Langmuir adsorption model; Industrial wastewater treatment

Jarosites are residues generated during the purification of zinc and composed mainly iron sulfates ((Na, K)Fe3(SO4)2(OH)6). Due to large volume jarosite process, these tend be deposited in land areas not used. In present work, was used without heat treatment (JST) as an adsorbent hexavalent chromium contained a sample wastewater from chrome plating industry under following conditions: C0 = 200 mg/L Cr, T 25 °C, pH 3. It only possible remove 34% Cr (VI). Subsequently, thermal (JTT) carried out at 600 °C. The heat-treated later same conditions those for JST. maximum removal 53%, adsorption capacity 10.99 mg/g. experimental data were fitted Langmuir model pseudo-second-order kinetic model. determined that process involved electrostatic attractions between surface positively charged anions industrial wastewater.