Journal ArticleDOI
Removal of Zn(II) from aqueous solution by natural halloysite nanotubes
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TLDR
In this paper, the removal of Zn(II) from aqueous solution by natural halloysite nanotubes (HNTs) was studied as a function of various solution chemistry conditions such as contact time, pH, ionic strength, coexisting electrolyte ions and temperature under ambient conditions.Abstract:
Clay minerals have been widely used in wastewater disposal due to their strong sorption and complexation ability towards various environmental pollutants. In this study, the removal of Zn(II) from aqueous solution by natural halloysite nanotubes (HNTs) was studied as a function of various solution chemistry conditions such as contact time, pH, ionic strength, coexisting electrolyte ions and temperature under ambient conditions. The results indicated that the removal of Zn(II) by HNTs was strongly dependent on pH and ionic strength. Langmuir and Freundlich models were used to simulate the sorption isotherms of Zn(II) at three different temperatures of 293, 313 and 333 K. The thermodynamic parameters (ΔH
0, ΔS
0 and ΔG
0) calculated from the temperature dependent sorption isotherms indicated that the removal process of Zn(II) by HNTs was endothermic and spontaneous. At low pH, the removal of Zn(II) was dominated by outer-sphere surface complexation and/or cation exchange with Na+/H+ on HNT surfaces, whereas inner-sphere surface complexation was the main removal mechanism at high pH. From the experimental results, one can conclude that HNTs may have a good potentiality for the disposal of Zn(II)-bearing wastewaters.read more
Citations
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References
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Adsorption of zinc(II) from water with purified carbon nanotubes
Chungsying Lu,Huantsung Chiu +1 more
TL;DR: In this paper, commercial single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotsubes (MWCNT) were used as adsorbents to study the adsorption characteristics of zinc from water.
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Mutual effects of Pb(II) and humic acid adsorption on multiwalled carbon nanotubes/polyacrylamide composites from aqueous solutions.
TL;DR: The results indicated that Pb(II) and HA adsorption were strongly dependent on pH and ionic strength, and these results are important for estimating and optimizing the removal of metal ions and organic substances by use of MWCNT/PAAM composites.
Journal ArticleDOI
Study on the adsorption of Neutral Red from aqueous solution onto halloysite nanotubes.
TL;DR: Halloysite nanotubes had the potential to be utilized as low-cost and relatively effective adsorbent for cationic dyes removal andThermodynamic parameters of DeltaG(0), DeltaH(0) and DeltaS( 0) indicated the adsorption process was spontaneous and endothermic.
Journal ArticleDOI
Adsorption of Ni(II) on oxidized multi-walled carbon nanotubes: effect of contact time, pH, foreign ions and PAA.
TL;DR: The adsorption of Ni(II) on oxidized multi-walled carbon nanotubes (MWCNTs) as a function of contact time, pH and foreign ions in the absence and presence of polyacrylic acid (PAA) was studied.