caa a22 4500 378941267 CHVBK 20180305123652.0 cr unu---uuuuu 161128e20040201xx s 000 0 eng 10.1524/ract.92.2.105.27459 doi (NATIONALLICENCE)gruyter-10.1524/ract.92.2.105.27459 Adsorption of 60Co2+ on hydrous manganese oxide powder from aqueous solution [Elektronische Daten] [F. Granados Correa, J. Jiménez-Becerril] Hydrous manganese oxide (HMO) was synthesized and its ability to sorb 60Co2+ from aqueous solution was studied under static conditions as a function of contact time, cobalt concentration (10-2-10-7M), temperature (303-333K) and pH of adsorptive solution (2.2-11.4). X-ray diffraction was used in characterization of synthesized HMO. Low concentration of 60Co2+ solution, high pH and high temperature were the most favorable conditions for the adsorption process. The results show that the removal process is complete in 40 minutes, obeys a first order rate law and can be described using the Freundlich adsorption model. The standard enthalpy of the system was ΔH0 = 12.5 ± 0.2 kJ mol-1 and cobalt desorption indicates that the uptake process proceeds via cation exchange. The removal of cobalt ions by HMO appears to be endothermic and irreversible. The values of calculated ΔG0 and ΔS0 were -17.0 ± 3.0 kJ mol-1 and (9.8 ± 0.2) × 10-2 kJ K-1 mol-1 respectively, this indicates spontaneity of the process and the degree of freedom of ions is increased by adsorption. © 2004 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Granados Correa F. aut Jiménez-Becerril J. aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/2/2004(2004-02-01), 105-110 0033-8230 92:2/2004<105 2004 92 ract https://doi.org/10.1524/ract.92.2.105.27459 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.92.2.105.27459 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Granados Correa F. aut NATIONALLICENCE 700 1- Jiménez-Becerril J. aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/2/2004(2004-02-01), 105-110 0033-8230 92:2/2004<105 2004 92 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter