A mechanistic investigation of highly stable nano ZrO 2 decorated nitrogen-rich azacytosine tethered graphene oxide-based dendrimer for the removal of arsenite from water

Subbaiah Muthu Prabhu, Radheshyam Rama Pawar, Keiko Sasaki, Chang Min Park

Research output: Contribution to journalArticle

Abstract

We focused to synthesize graphene oxide-polyamidoamine dendrimer, up to 2nd generation, (GO-gen2) via a grafting method and the tethered groups were further covalently functionalized with a nitrogen-rich of an aromatic triazine ring of 5-azacytosine (Aza). Zirconia nanoparticles (ZrO 2 ) has been identified as promising material for removal of AsO 3 3− from water, however, its practical applicability is hindered due to its nanosize. Hence, ZrO 2 was successfully decorated through biomolecule assist on GO-gen2-Aza dendrimer. Various amounts of GO-gen2-Aza were used as stable supports to develop the nanocomposites with ZrO 2 . Then, the adsorption efficiency of highly toxic AsO 3 3− on developed composites was investigated for water treatment. The synthesized GO-dendrimer composites were characterized well before and after adsorption of AsO 3 3− using FTIR, PXRD, SEM, XPS, TGA, TEM and BET analysis. Particle size distribution of ZrO 2 revealed the peak top at 28 nm by zeta potential measurement. During synthesis, the GO sheets of composite were laminated by incorporation of ZrO 2 nanoparticles. The results of the batch experiments showed that ZrO 2 @2%GO-gen2-Aza dendrimer had higher adsorption density of AsO 3 3− than that of other developed forms of dendrimer composites. Langmuir equation well described the adsorption isotherm with the maximum adsorption capacity of 1.075 mmol/g. In addition, the enhanced AsO 3 3− adsorption density on ZrO 2 surface of ZrO 2 @x%GO-gen2-Aza, in which the GO-sheets were delaminated, resulting more ZrO 2 was dispersed homogeneously in the GO-sheets for maximum uptake of AsO 3 3− from water, confirmed by PXRD patterns. These results suggested that the developed GO-based dendrimer materials can be utilised for the practical remediation of toxic AsO 3 3− and other similar types of toxic ions, selenite, phosphate and fluoride from the contaminated water.

Original languageEnglish
Pages (from-to)1474-1484
Number of pages11
JournalChemical Engineering Journal
DOIs
Publication statusPublished - Aug 15 2019

Fingerprint

Dendrimers
Graphite
arsenite
Oxides
Graphene
Nitrogen
oxide
adsorption
Water
Poisons
nitrogen
Adsorption
water
Composite materials
Nanoparticles
Selenious Acid
Triazines
selenite
triazine
Laminated composites

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

A mechanistic investigation of highly stable nano ZrO 2 decorated nitrogen-rich azacytosine tethered graphene oxide-based dendrimer for the removal of arsenite from water . / Prabhu, Subbaiah Muthu; Pawar, Radheshyam Rama; Sasaki, Keiko; Park, Chang Min.

In: Chemical Engineering Journal, 15.08.2019, p. 1474-1484.

Research output: Contribution to journalArticle

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abstract = "We focused to synthesize graphene oxide-polyamidoamine dendrimer, up to 2nd generation, (GO-gen2) via a grafting method and the tethered groups were further covalently functionalized with a nitrogen-rich of an aromatic triazine ring of 5-azacytosine (Aza). Zirconia nanoparticles (ZrO 2 ) has been identified as promising material for removal of AsO 3 3− from water, however, its practical applicability is hindered due to its nanosize. Hence, ZrO 2 was successfully decorated through biomolecule assist on GO-gen2-Aza dendrimer. Various amounts of GO-gen2-Aza were used as stable supports to develop the nanocomposites with ZrO 2 . Then, the adsorption efficiency of highly toxic AsO 3 3− on developed composites was investigated for water treatment. The synthesized GO-dendrimer composites were characterized well before and after adsorption of AsO 3 3− using FTIR, PXRD, SEM, XPS, TGA, TEM and BET analysis. Particle size distribution of ZrO 2 revealed the peak top at 28 nm by zeta potential measurement. During synthesis, the GO sheets of composite were laminated by incorporation of ZrO 2 nanoparticles. The results of the batch experiments showed that ZrO 2 @2{\%}GO-gen2-Aza dendrimer had higher adsorption density of AsO 3 3− than that of other developed forms of dendrimer composites. Langmuir equation well described the adsorption isotherm with the maximum adsorption capacity of 1.075 mmol/g. In addition, the enhanced AsO 3 3− adsorption density on ZrO 2 surface of ZrO 2 @x{\%}GO-gen2-Aza, in which the GO-sheets were delaminated, resulting more ZrO 2 was dispersed homogeneously in the GO-sheets for maximum uptake of AsO 3 3− from water, confirmed by PXRD patterns. These results suggested that the developed GO-based dendrimer materials can be utilised for the practical remediation of toxic AsO 3 3− and other similar types of toxic ions, selenite, phosphate and fluoride from the contaminated water.",
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