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Adsorption of cadmium by a high-capacity adsorbent composed of silicate-titanate nanotubes embedded in hydrogel chitosan beads

Quiroga Flores, Roxana LU ; Noshad, Asma LU ; Wallenberg, Reine LU and Önnby, Linda LU (2020) In Environmental Technology 41(23). p.3043-3054
Abstract
In this study, we developed a nanoparticle-based mesoporous composite that consisted of silicate-titanate nanotubes (STNTs) supported in hydrogel chitosan beads (STNTs-Ch beads) and was studied for Cd2+ adsorption. By using Fourier-transform infrared spectroscopy, transmission and scanning electron microscopy coupled to an energy-dispersive X-ray spectrometer, we could
determine that the hollow STNTs were highly dispersed in the walls of the hollow beads. The dispersion was attributed to the effect of pH when the composite was prepared and we observed a non-interaction between STNTs and chitosan. The adsorption studies of Cd2+ showed that the kinetic rate (k2) increased 3-fold and that the diffusion... (More)
In this study, we developed a nanoparticle-based mesoporous composite that consisted of silicate-titanate nanotubes (STNTs) supported in hydrogel chitosan beads (STNTs-Ch beads) and was studied for Cd2+ adsorption. By using Fourier-transform infrared spectroscopy, transmission and scanning electron microscopy coupled to an energy-dispersive X-ray spectrometer, we could
determine that the hollow STNTs were highly dispersed in the walls of the hollow beads. The dispersion was attributed to the effect of pH when the composite was prepared and we observed a non-interaction between STNTs and chitosan. The adsorption studies of Cd2+ showed that the kinetic rate (k2) increased 3-fold and that the diffusion rate (Kd) increased 2-fold after
the embedment. Moreover, the maximum capacity of adsorption of STNTs-Ch beads was 2.3 times higher than that of STNTs alone. The treatment of a synthetic Cd2+ solution and a real leachate in continuous mode showed two phases in which it was observed higher removed fractions of transition metal ions (Cd2+, Co2+, Ni2+, Zn2+ and Cu2+) and the post-transition metal ion Pb2+, in comparison to the removed fractions of alkali and alkali-earth metal ions (Ca2+, K+, Mg2+). The composite was successfully reused four times when adsorbing Cd2+, saving three times the needed amounts of TiO2, SiO2 and chitosan for the production of the material. This composite was produced in a simple way and shows the potential for wastewater treatment. (Less)
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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
silicate-titanate nanotubes, chitosan beads, cadmium, adsorption, reuse
in
Environmental Technology
volume
41
issue
23
pages
12 pages
publisher
Taylor & Francis
external identifiers
  • scopus:85063883725
  • pmid:30892147
ISSN
1479-487X
DOI
10.1080/09593330.2019.1596167
language
English
LU publication?
yes
id
e4b63bfe-067e-4ad5-aa76-2f4ace916a49
date added to LUP
2019-04-22 19:43:30
date last changed
2021-01-19 01:48:39
@article{e4b63bfe-067e-4ad5-aa76-2f4ace916a49,
  abstract     = {In this study, we developed a nanoparticle-based mesoporous composite that consisted of silicate-titanate nanotubes (STNTs) supported in hydrogel chitosan beads (STNTs-Ch beads) and was studied for Cd<sup>2+</sup> adsorption. By using Fourier-transform infrared spectroscopy, transmission and scanning electron microscopy coupled to an energy-dispersive X-ray spectrometer, we could<br/>determine that the hollow STNTs were highly dispersed in the walls of the hollow beads. The dispersion was attributed to the effect of pH when the composite was prepared and we observed a non-interaction between STNTs and chitosan. The adsorption studies of Cd<sup>2+</sup> showed that the kinetic rate (k<sub>2</sub>) increased 3-fold and that the diffusion rate (K<sub>d</sub>) increased 2-fold after<br/>the embedment. Moreover, the maximum capacity of adsorption of STNTs-Ch beads was 2.3 times higher than that of STNTs alone. The treatment of a synthetic Cd<sup>2+</sup> solution and a real leachate in continuous mode showed two phases in which it was observed higher removed fractions of transition metal ions (Cd<sup>2+</sup>, Co<sup>2+</sup>, Ni<sup>2+</sup>, Zn<sup>2+</sup> and Cu<sup>2+</sup>) and the post-transition metal ion Pb<sup>2+</sup>, in comparison to the removed fractions of alkali and alkali-earth metal ions (Ca<sup>2+</sup>, K<sup>+</sup>, Mg<sup>2+</sup>). The composite was successfully reused four times when adsorbing Cd<sup>2+</sup>, saving three times the needed amounts of TiO<sub>2</sub>, SiO<sub>2</sub> and chitosan for the production of the material. This composite was produced in a simple way and shows the potential for wastewater treatment.},
  author       = {Quiroga Flores, Roxana and Noshad, Asma and Wallenberg, Reine and Önnby, Linda},
  issn         = {1479-487X},
  language     = {eng},
  number       = {23},
  pages        = {3043--3054},
  publisher    = {Taylor & Francis},
  series       = {Environmental Technology},
  title        = {Adsorption of cadmium by a high-capacity adsorbent composed of silicate-titanate nanotubes embedded in hydrogel chitosan beads},
  url          = {http://dx.doi.org/10.1080/09593330.2019.1596167},
  doi          = {10.1080/09593330.2019.1596167},
  volume       = {41},
  year         = {2020},
}