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Membrane Water Treatment
  Volume 13, Number 5, September 2022 , pages 227-233
DOI: https://doi.org/10.12989/mwt.2022.13.5.227
 


Adsorptive and kinetic studies of toxic metal ions from contaminated water by functionalized silica
Rajesh Kumar, Sunita Verma, Geeta Harwani, Deepesh Patidar and Sanjit Mishra

 
Abstract
    The objective of the study, to develop adsorbent based purifier for removal of radiological and nuclear contaminants from contaminated water. In this regard, 3-aminopropyl silica functionalized with ethylenediamine tetraacetic acid (APS-EDTA) adsorbent prepared and characterized by Fourier Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD). Prepared APS-EDTA used for adsorptive studies of Cs(I), Co(II), Sr(II), Ni(II) and Cd(II) from contaminated water. The effect on adsorption of various parameters viz. contact time, initial concentration of metal ions and pH were also analyzed. The batch method has been employed using metal ions in solution from 1000-10000 µg/L, contact time 5-60 min., pH 4-10 and material quantities 50-200 mg at room temperature. The obtained adsorption data were used for drawing Freundlich and Langmuir isotherms model and both models were found suitable for explaining the metal ions adsorption on APS-EDTA. The adsorption data were followed pseudo second order reaction kinetics. The maximum adsorption capacity obtained 1.3037-1.4974 mg/g for above said metal ions. The results show that APS-EDTA have great potential to remove Cd(II), Co(II), Cs(I), Ni(II) and Sr(II) from aqueous solutions through chemisorption and physio-sorption.
 
Key Words
    adsorption; aminopropyl silica; cesium and strontium; removal; toxic metal ions
 
Address
Rajesh Kumar, Sunita Verma, Geeta Harwani, Deepesh Patidar and Sanjit Mishra: Water Quality Management Group, Desert Environmental Science and Technology Division
 

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