naa a22 4500 510748872 CHVBK 20180411083057.0 cr unu---uuuuu 180411e20130101xx s 000 0 eng 10.1007/s11270-012-1401-4 doi (NATIONALLICENCE)springer-10.1007/s11270-012-1401-4 A Study Employing Differents Clays for Fe and Mn Removal in the Treatment of Acid Mine Drainage [Elektronische Daten] [Eduardo Goldani, Celso Moro, Sandra Maia] Acid mine drainage (AMD) has long been a significant environmental problem that impairs water resources in historic or current mining industries throughout the world. One of the methods using passive treatment system at low cost to remove metals from solution involves the use of clays. The ability of three different adsorbents (montmorillonite K-10, bentonite (NT-25), and hydrotalcite (HT)) to remove Fe and Mn from aqueous solutions and acid mine drainage samples has been studied at different optimized conditions such as pH, amount of adsorbent and contact time. Flame atomic absorption spectrometer (FAAS) was used for measuring Fe and Mn concentrations. Langmuir and Freundlich isotherms were applied and isotherm coefficients were computed. A kinectic study was also developed for HT using the first order, second order and intraparticle diffusion models. A great amount of clay (more than 100mg) and also contact times higher than 60min had also no influence in the adsorption capacity for all adsorbents. HT was found to be the best among the studied clays removing more than 90% of Fe and Mn for all AMD samples investigated. Moreover, the maximum adsorption capacity was 63.7mg Mn g−1 HT and 666.7mg Fe g−1 HT. Springer Science+Business Media Dordrecht, 2012 Acid mine drainage nationallicence Adsorption nationallicence Clays nationallicence Fe nationallicence Mn nationallicence FAAS nationallicence Goldani Eduardo Instituto de Química, Universidade Federal do Rio Grande do Sul (UFRGS), P.O. Box 15003, 91501-970, Porto Alegre, RS, Brazil aut Moro Celso Instituto de Química, Universidade Federal do Rio Grande do Sul (UFRGS), P.O. Box 15003, 91501-970, Porto Alegre, RS, Brazil aut Maia Sandra Instituto de Química, Universidade Federal do Rio Grande do Sul (UFRGS), P.O. Box 15003, 91501-970, Porto Alegre, RS, Brazil aut Water, Air, & Soil Pollution Springer Netherlands 224/1(2013-01-01), 1-11 0049-6979 224:1<1 2013 224 11270 https://doi.org/10.1007/s11270-012-1401-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-012-1401-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Goldani Eduardo Instituto de Química, Universidade Federal do Rio Grande do Sul (UFRGS), P.O. Box 15003, 91501-970, Porto Alegre, RS, Brazil aut NATIONALLICENCE 700 1- Moro Celso Instituto de Química, Universidade Federal do Rio Grande do Sul (UFRGS), P.O. Box 15003, 91501-970, Porto Alegre, RS, Brazil aut NATIONALLICENCE 700 1- Maia Sandra Instituto de Química, Universidade Federal do Rio Grande do Sul (UFRGS), P.O. Box 15003, 91501-970, Porto Alegre, RS, Brazil aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/1(2013-01-01), 1-11 0049-6979 224:1<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer