Skip to main content
Journal cover image

Sustainable polyelectrolyte multilayer surfaces: possible matrix for salt/dye separation.

Publication ,  Journal Article
Gopalakrishnan, A; Mathew, ML; Chandran, J; Winglee, J; Badireddy, AR; Wiesner, M; Aravindakumar, CT; Aravind, UK
Published in: ACS applied materials & interfaces
February 2015

The development of a sustainable membrane surface based on chitosan/poly(acrylic acid) (CHI/PAA) multilayers suitable for applications in analytical separations is reported here. Bilayers are constructed on polyamide microfiltration membranes at a pH combination of 3/3 (CHI pH/PAA pH) through a layer by layer approach. A 12.5 bilayer yielded a thickness of 400 nm. Low pressure (10 psi) filtrations through a 5.5 bilayered membrane exhibited high flux (7 m(3) m(-2) day(-1)) and selectivity (NaCl/reactive black 5 (RB5) selectivity >8000). The selectivity and flux observed here are the highest reported to date for low pressure filtrations through membranes. The increase in flux with increasing feed salt concentration is correlated with morphological transformations. Salt content above 7500 ppm causes some perturbation of surface layers. The presence of RB5, a model dye in the feed, restores the surface to maintain sustainability. A skin layer as thin as 50 nm imparts a large separation window. An RB5 feed concentration of 500 ppm results in 98.64% rejection with a flux of 25.79 m(3) m(-2) day(-1). The increase in flux with feed dye concentration supports the plasticizing action of RB5. The transport studies with large feed dye concentrations indicate that at a dye concentration of 500 ppm, the linear growing region (pre-exponential, 5.5 bilayer) itself provides a separation window similar to that of 100 ppm. At the same time, 1000 ppm requires a 9.5 bilayer that falls in the nonlinear growing region. Scanning electron microscopy images show the increase in porosity with respect to feed dye. Interesting morphologies that show the sustainable nature of the membrane surfaces along with the transport data of RB5 are presented.

Duke Scholars

Altmetric Attention Stats
Dimensions Citation Stats

Published In

ACS applied materials & interfaces

DOI

EISSN

1944-8252

ISSN

1944-8244

Publication Date

February 2015

Volume

7

Issue

6

Start / End Page

3699 / 3707

Related Subject Headings

  • Nanoscience & Nanotechnology
  • 51 Physical sciences
  • 40 Engineering
  • 34 Chemical sciences
  • 09 Engineering
  • 03 Chemical Sciences
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Gopalakrishnan, A., Mathew, M. L., Chandran, J., Winglee, J., Badireddy, A. R., Wiesner, M., … Aravind, U. K. (2015). Sustainable polyelectrolyte multilayer surfaces: possible matrix for salt/dye separation. ACS Applied Materials & Interfaces, 7(6), 3699–3707. https://doi.org/10.1021/am508298d
Gopalakrishnan, Akhil, Mary Lidiya Mathew, Jisha Chandran, Judith Winglee, Appala Raju Badireddy, Mark Wiesner, Charuvila T. Aravindakumar, and Usha K. Aravind. “Sustainable polyelectrolyte multilayer surfaces: possible matrix for salt/dye separation.ACS Applied Materials & Interfaces 7, no. 6 (February 2015): 3699–3707. https://doi.org/10.1021/am508298d.
Gopalakrishnan A, Mathew ML, Chandran J, Winglee J, Badireddy AR, Wiesner M, et al. Sustainable polyelectrolyte multilayer surfaces: possible matrix for salt/dye separation. ACS applied materials & interfaces. 2015 Feb;7(6):3699–707.
Gopalakrishnan, Akhil, et al. “Sustainable polyelectrolyte multilayer surfaces: possible matrix for salt/dye separation.ACS Applied Materials & Interfaces, vol. 7, no. 6, Feb. 2015, pp. 3699–707. Epmc, doi:10.1021/am508298d.
Gopalakrishnan A, Mathew ML, Chandran J, Winglee J, Badireddy AR, Wiesner M, Aravindakumar CT, Aravind UK. Sustainable polyelectrolyte multilayer surfaces: possible matrix for salt/dye separation. ACS applied materials & interfaces. 2015 Feb;7(6):3699–3707.
Journal cover image

Published In

ACS applied materials & interfaces

DOI

EISSN

1944-8252

ISSN

1944-8244

Publication Date

February 2015

Volume

7

Issue

6

Start / End Page

3699 / 3707

Related Subject Headings

  • Nanoscience & Nanotechnology
  • 51 Physical sciences
  • 40 Engineering
  • 34 Chemical sciences
  • 09 Engineering
  • 03 Chemical Sciences