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Halloysite/alginate nanocomposite beads: Kinetics, equilibrium and mechanism for lead adsorption
https://orcid.org/0000-0002-4215-5284
Abstract This study highlights the potential of Hal/alginate nanocomposite beads for the removal of Pb2+ in aqueous solutions. This is based on comprehensive physicochemical–mechanical characterizations involving adsorption equilibrium, adsorption kinetics, diffusion studies, FTIR, EDX, FESEM, zeta potential, and compression tests. Results show Langmuirian adsorption isotherms and reasonably rapid second order adsorption kinetics. The Hal/alginate nanocomposite beads have high adsorption capacity for Pb2+ (i.e. 325mg/g) compared to that of free Hal nanotubes (i.e. 84mg/g). The overall process was diffusion limited, well described by the shrinking core model. The Hal/alginate beads removed Pb2+ through ion exchange with Ca2+ followed by coordination with carboxylate groups of alginate, in addition to physisorption on Hal nanotubes. Vital for industrial applications, the Young's modulus of the nanocomposite beads was strengthened by Hal nanotubes loading as well as Pb2+ uptake. As such, this adsorbent incorporates distinctive merits of both Hal nanotubes and alginate, which include the high affinity towards Pb2+, strong mechanical properties, and easy separation from the treated solution.
Graphical abstract Display Omitted
Highlights Hal/alginate beads adsorb more Pb2+ (325mg/g) than conventional adsorbents. The mechanical strength of the beads increased by twofold post-adsorption. The shrinking core and Langmuir isotherm describe this diffusion limited process. Pb2+ removal is via ion exchange with Ca2+ and physisorption by Hal nanotubes.
Halloysite/alginate nanocomposite beads: Kinetics, equilibrium and mechanism for lead adsorption
https://orcid.org/0000-0002-4215-5284
Abstract This study highlights the potential of Hal/alginate nanocomposite beads for the removal of Pb2+ in aqueous solutions. This is based on comprehensive physicochemical–mechanical characterizations involving adsorption equilibrium, adsorption kinetics, diffusion studies, FTIR, EDX, FESEM, zeta potential, and compression tests. Results show Langmuirian adsorption isotherms and reasonably rapid second order adsorption kinetics. The Hal/alginate nanocomposite beads have high adsorption capacity for Pb2+ (i.e. 325mg/g) compared to that of free Hal nanotubes (i.e. 84mg/g). The overall process was diffusion limited, well described by the shrinking core model. The Hal/alginate beads removed Pb2+ through ion exchange with Ca2+ followed by coordination with carboxylate groups of alginate, in addition to physisorption on Hal nanotubes. Vital for industrial applications, the Young's modulus of the nanocomposite beads was strengthened by Hal nanotubes loading as well as Pb2+ uptake. As such, this adsorbent incorporates distinctive merits of both Hal nanotubes and alginate, which include the high affinity towards Pb2+, strong mechanical properties, and easy separation from the treated solution.
Graphical abstract Display Omitted
Highlights Hal/alginate beads adsorb more Pb2+ (325mg/g) than conventional adsorbents. The mechanical strength of the beads increased by twofold post-adsorption. The shrinking core and Langmuir isotherm describe this diffusion limited process. Pb2+ removal is via ion exchange with Ca2+ and physisorption by Hal nanotubes.
Halloysite/alginate nanocomposite beads: Kinetics, equilibrium and mechanism for lead adsorption
https://orcid.org/0000-0002-4215-5284
Abstract This study highlights the potential of Hal/alginate nanocomposite beads for the removal of Pb2+ in aqueous solutions. This is based on comprehensive physicochemical–mechanical characterizations involving adsorption equilibrium, adsorption kinetics, diffusion studies, FTIR, EDX, FESEM, zeta potential, and compression tests. Results show Langmuirian adsorption isotherms and reasonably rapid second order adsorption kinetics. The Hal/alginate nanocomposite beads have high adsorption capacity for Pb2+ (i.e. 325mg/g) compared to that of free Hal nanotubes (i.e. 84mg/g). The overall process was diffusion limited, well described by the shrinking core model. The Hal/alginate beads removed Pb2+ through ion exchange with Ca2+ followed by coordination with carboxylate groups of alginate, in addition to physisorption on Hal nanotubes. Vital for industrial applications, the Young's modulus of the nanocomposite beads was strengthened by Hal nanotubes loading as well as Pb2+ uptake. As such, this adsorbent incorporates distinctive merits of both Hal nanotubes and alginate, which include the high affinity towards Pb2+, strong mechanical properties, and easy separation from the treated solution.
Graphical abstract Display Omitted
Highlights Hal/alginate beads adsorb more Pb2+ (325mg/g) than conventional adsorbents. The mechanical strength of the beads increased by twofold post-adsorption. The shrinking core and Langmuir isotherm describe this diffusion limited process. Pb2+ removal is via ion exchange with Ca2+ and physisorption by Hal nanotubes.
Halloysite/alginate nanocomposite beads: Kinetics, equilibrium and mechanism for lead adsorption
Chiew, Christine Shu Ching (author) / Yeoh, Hak Koon (author) / Pasbakhsh, Pooria (author) / Krishnaiah, Kamatam (author) / Poh, Phaik Eong (author) / Tey, Beng Ti (author) / Chan, Eng Seng (author)
Applied Clay Science ; 119 ; 301-310
2015-10-26
10 pages
Article (Journal)
Electronic Resource
English
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