Technical University of Czestochowa Institute of Environmental Engineering Czestochowa, Poland. THE POTENTIAL APPLICATIONS OF ALUMINOSILICATES FOR METALS REMOVAL FROM WATER. M agdalena Zabochnicka-Świątek. Heavy metal pollution . TOXICITY human health living resources
Technical University of Czestochowa
Institute of Environmental Engineering
THE POTENTIAL APPLICATIONS OF ALUMINOSILICATES FOR METALS REMOVALFROM WATER
1. ARSENIC (As)
4. NICKEL (Ni)
The cells:POLYHEDRONS inside of which there are voids of different sizes dependent on the zeolite type A- 0.4 nm i type X- 0.9 nm
Heulandite Analcime Gmelinite
(Na, K, Ca)4Al6Si30O72•24H2O
the sorbent and metal
Studies on both non-activated and activated zeolites, as well as on zeolites hydrogenated or modified with iron:
Pb2+ > Cd2+ > Zn2+ ≥ Cu2+ > Ni2+ > Hg2+
Pb2+> Fe2+> Cr2+ ≥ Cu2+
Pb2+> Cu2+> Cd2+> Ni2+
Pb2+ > Cd2+ > Cu2+ > Ni2+
The application of zeolites provide an economical means of removing mixed heavy metals from water.
Each metal has a tendency to form specific compounds in water and they can be removed by different mechanisms – adsorption or/and ion exchange.
The removal of heavy metals from water because of their toxic effects on living species is extremely important.
The differences in the ion exchange selectivity of clinoptilolite are probably caused by competition processes.
Sorption of arsenic on zeolites requires further research.
Modifications of clinoptilolite enhance its ion exchange ability by optimising the selectivity and sorption efficiency.
Clinoptilolite may be used, as a low-cost, nontoxic and abundant source, for the removal of heavy metals from water.
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