Journal
MATERIALS
Volume 14, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/ma14113018
Keywords
Na-P1 zeolite; zeolite-carbon composite; zinc and lead adsorption; simultaneous ions removal; desorption by HCl; NaOH; electrokinetic parameters
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Funding
- National Centre for Research and Development project Lider contract [LIDER/19/0072/L-9/17/NCBR/2018]
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The research indicated that pure zeolite has the largest adsorption capacity for lead(II) ions and can be efficiently regenerated. Mixed adsorbates have minimal impact on singly adsorbed ions, but significantly decrease the adsorption of other ions.
Considering the growing needs of environmental remediation, new effective solutions should be sought. Therefore, the adsorbed amounts of heavy metal ions, such as lead(II) and zinc(II), on the surface of high-carbon fly ash (HiC FA), zeolite--carbon composite (Na-P1(C)) and pure zeolite (Na-P1), were investigated. The applied solids were characterized using the following techniques: XRD, SEM-EDS, TEM, porosimetry, SLS, electrophoresis and potentiometric titration. The heavy metal concentration in the probes was determined by applying ICP-OES spectroscopy. Adsorption/desorption and electrokinetic measurements were performed in the systems containing one or two adsorbates. The obtained results indicated that Pb(II) ions are adsorbed in larger amounts on the investigated solid surface due to the molecular sieving effect. The largest adsorption capacity relative to lead(II) ions was observed for pure Na-P1 zeolite (407 mg/g). The simultaneous presence of Pb(II) + Zn(II) mixed adsorbates minimally affects the amount of adsorbed Pb(II) ions and causes a significant decrease of Zn(II) ion adsorption (in comparison with analogous systems containing single adsorbates). It was also shown that all solids can be efficiently regenerated using hydrochloric acid. Thus, the selected pure zeolite can be successfully applied in soil remediation or other purifying technologies as an effective Pb(II) adsorbent.
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