Abstract
Geopolymer adsorbents were prepared from silica and metakaolin in different Al and Si components and applied for removal of metal ions, Cs+ and Pb2+, from other heavy metal ions mixture. The geopolymer was optimized at Si/Al = 2 as adsorbent, targeting to Cs+ and Pb2+ separation. The binding behavior was well fitted to Langmuir model, which proved that the metakaolin-based geopolymer had multibinding to adsorb ions. The effective adsorption was also observed independent of NaCl concentration for the Cs+ and Pb2+. This meant that the ion adsorption of geopolymers occurred under non-electrostatic mechanism.
Highlights
The presence of the toxic metals generated by mineral processing in industries causes a major hazard to the water environment [1]
Serious regulations are required to establish in many countries to remove effectively the toxic metal ions from the waste waters prior to discharge into natural environment
Before the adsorption tests of metal ions, the powder samples were characterized by FT-IR spectroscopy for determination of molecular vibration of the geopolymers, X-ray diffractometer (XRD) for crystal structure determination, X-ray fluorescence (XRF) in order to know chemical composition of principal components and Scanning electron microscopy (SEM) was used for evaluation of geopolymers morphology
Summary
The presence of the toxic metals generated by mineral processing in industries causes a major hazard to the water environment [1]. In the approach to replace the conventional adsorbents, geopolymers are a new strategy for decontamination of metal ions from waste water, which are composed of silica and alumina similar to zeolite material [5]-[9]. If geopolymers can remove metal ions from waste water via adsorption, the regenerated matrix could become new approach for several industries. This affects both the environment and societies positively [17]-[19]. The adsorption behavior was examined in a mixture of aqueous solution in detail for targeted separation of Cs+ and Pb2+ ions
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