Influence of both the composition of impregnation solution and impregnation method on copper(II), chromium(VI) and silver(I) deposition on activated carbon

• Published in: Hemijska industrija 2003, Vol.57 (1), p.1-8
• Main Authors: Ivanovic, Slavica, Zivanovic, Aleksandar, Bosnjakov, Gordana
• Format: Article
• Language: English
• Subjects: AAS; Activated carbon; actracted carbon; Atomic absorption analysis; Chromium; complex; Copper; Copper compounds; Deposition; gas filter; Impregnation; Moisture content; Silver
• ISSN: 0367-598X; 2217-7426
• DOI: 10.2298/HEMIND0301001I

The composition of a solution for impregnating activated carbon (AC) for use in a gas filter was investigated. The solution components were tetraaminocop-per(II) complex, chromium(VI), silver(l) and carbonate ions. Two methods of impregnation were investigated: ion adsorption from aqueous solution in excess and the incipient wetness method. Copper, chromium and silver con-tents on AC Were determined by atomic absorption spectrometry. The largest copper contents (4.38 and 5.00 % (w/w for two AC samples) were achieved at: c([Cu(NH3)4]2+) = 1.0 mol/L; M(Cu) i M(Cr) = 3.75: 1; M(Cu) i M(Ag) = 62: 1 and M(Cu): M(CO3) = 2: 1, using two fold impregnation by the incipient wetness method with 2.4 mL of solution per 3 g AC. The contents of chromium and silver on the same AC samples Were 1.06 and 0.0098 % for the first and 1.14 and 0.009 % for the second AC. A larger Cr content (1.57 %) was achieved from an impregnation solution in excess (c([Cu(NH3)4]2+) = 1.25 mol/L; M(Cu) i M(Cr) = 3: 1; without Ag). The largest Ag content (0.17 %) was obtained using two fold impregnation by the incipient wetness method (c([Cu(NH3)4]2+) = 0.8 mol/L; M(Cu): M(Cr) = 3.75: 1