The effect of pH changes on the ability of the synthetic zeolite NaA to remove Cr3+ from water by ion exchange was investigated. The exchange rate was improved by working near neutrality. Despite of the occurrence of simultaneous adsorption, precipitation or cation exchange phenomena, spectroscopic analyses of samples taken at different contact times suggested the presence of an unique chromium environment in the solid phase. The increase in pH observed during the ion exchange favored polymerization-precipitation of chromium species present in solution, which, in turn, improved the metal removal capacity of zeolite NaA above the values expected for a pure cationic exchange reaction.
Chromium removal from water using LTA zeolites: Effect of pH / E. I., Basaldella; P. G., Vzquez; Iucolano, Fabio; Caputo, Domenico. - In: JOURNAL OF COLLOID AND INTERFACE SCIENCE. - ISSN 0021-9797. - ELETTRONICO. - 313:(2007), pp. 574-578. [10.1016/j.jcis.2007.04.066]
Chromium removal from water using LTA zeolites: Effect of pH
IUCOLANO, FABIO;CAPUTO, DOMENICO
2007
Abstract
The effect of pH changes on the ability of the synthetic zeolite NaA to remove Cr3+ from water by ion exchange was investigated. The exchange rate was improved by working near neutrality. Despite of the occurrence of simultaneous adsorption, precipitation or cation exchange phenomena, spectroscopic analyses of samples taken at different contact times suggested the presence of an unique chromium environment in the solid phase. The increase in pH observed during the ion exchange favored polymerization-precipitation of chromium species present in solution, which, in turn, improved the metal removal capacity of zeolite NaA above the values expected for a pure cationic exchange reaction.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
