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Competitive adsorption of lead and cadmium onto nanoplastics with different charges: Two-dimensional correlation spectroscopy study.
- Source :
- Environmental Science & Pollution Research; Jun2023, Vol. 30 Issue 28, p72884-72899, 16p
- Publication Year :
- 2023
-
Abstract
- The competitive adsorption ability and mechanisms of lead (Pb<superscript>2+</superscript>) and cadmium (Cd<superscript>2+</superscript>) by nanoplastics (NPs) with positive charges (PS-NH<subscript>2</subscript>) and negative charges (PS-SO<subscript>3</subscript>H) were investigated by using batch adsorption experiments coupled with the two-dimensional correlation spectroscopy (2D-COS) method. The adsorption isotherm results showed that PS-SO<subscript>3</subscript>H exhibited a higher adsorption capacity for Pb<superscript>2+</superscript> or Cd<superscript>2+</superscript> compared to PS-NH<subscript>2</subscript>. The adsorption affinity of NPs for Pb<superscript>2+</superscript> was higher than that of Cd<superscript>2+</superscript>. The competitive adsorption results showed that Pb<superscript>2+</superscript> had a more pronounced negative effect on the adsorption of Cd<superscript>2+</superscript>. The adsorption capacities of NPs were affected by the surface charge and solution pH. Electrostatic force was the main factor influencing PS-SO<subscript>3</subscript>H to capture Pb<superscript>2+</superscript> and Cd<superscript>2+</superscript>, while chelation was the main mechanism between PS-NH<subscript>2</subscript> and metals. The functional groups of NPs played significant roles in the sorption of Pb<superscript>2+</superscript> or Cd<superscript>2+</superscript> according to the FTIR spectra and 2D-COS analysis. This study provided new insights into the impact of NPs on the transport of other pollutants. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09441344
- Volume :
- 30
- Issue :
- 28
- Database :
- Complementary Index
- Journal :
- Environmental Science & Pollution Research
- Publication Type :
- Academic Journal
- Accession number :
- 164227329
- Full Text :
- https://doi.org/10.1007/s11356-023-27546-5