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Use of natural zeolites charged with ammonium or carbon dioxide in phytoremediation of lead‐ and zinc‐contaminated soils
Author(s) -
Lai Tiziana,
Cao Alessia,
Zucca Antonio,
Carucci Alessandra
Publication year - 2012
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.3788
Subject(s) - chemistry , clinoptilolite , phytoremediation , zeolite , ammonium , aluminosilicate , environmental remediation , zinc , environmental chemistry , contamination , catalysis , heavy metals , organic chemistry , ecology , biology
BACKGROUND: Zeolites are hydrated aluminosilicate characterized by high cation exchange capacity. The application of zeolites to different technologies is feasible, particularly to remediation technologies. The present work has the purpose to test the use of natural zeolites (clinoptilolite) in phytoremediation of a lead‐ and zinc‐contaminated soil. The soil was mixed with different doses of zeolites (uncharged), zeolites charged with ammonium and zeolites charged with carbon dioxide. The plant used for the experiment was Mirabilis jalapa L. RESULTS: The treatment with uncharged zeolites influenced positively M. jalapa growth in increasing plant biomass production of 15–20% and in reducing, at the same time, the accumulation of metals in the aerial part to a greater extent for lead (phytostabilization). The mixtures with only NH $_{4}^{+}$ ‐charged zeolites had a toxic effect on the plants, but when uncharged or CO 2 ‐charged zeolites were added to the former the metal accumulation in the aerial parts increased. CONCLUSION: The limitation of metal accumulation in the aerial part of the plant in the pots with uncharged zeolites could imply their use in phytostabilization treatments; however the application in a phytoextraction process of the mixtures with zeolites appropriately charged with ammonium, even in a mixture with CO 2 ‐charged zeolites, appears more promising. Copyright © 2012 Society of Chemical Industry