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Title: Exceptional selectivity for dissolved silicas in industrial waters using mixed oxides

Abstract

The removal of silica, ubiquitous in produced and industrial waters, by novel mixed oxides is investigated in this present study. We have combined the advantage of high selectivity hydrotalcite (HTC, (Mg 6Al 2(OH) 16(CO 3)·4H 2O)), with large surface area of active alumina (AA, (Al 2O 3)) for effective removing of the dissolved silica from cooling tower water. The batch test results indicated the combined HTC/AA is a more effective method for removing silica from CTW than using each of HTC or AA separately. The silica uptake was confirmed by Fourier transform infrared (FTIR), and Energy dispersive spectroscopy (EDS). Our results indicate HTC/AA effectively removes silica from cooling tower water (CTW), even in the presence of large concentrations of competing anions, such as Cl -, NO 3 - HCO 3 -, CO 3 2- and SO 4 2-. The Single Path Flow Through (SPFT) tests confirmed to rapid uptake of silica by combined HTC/AA during column filtration. The experimental data of silica adsorption fit best to Freundlich isotherm model.

Authors:
 [1];  [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1411608
Report Number(s):
SAND-2017-7226J
Journal ID: ISSN 2214-7144; PII: S2214714417305093
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Water Process Engineering
Additional Journal Information:
Journal Volume: 20; Journal Issue: C; Journal ID: ISSN 2214-7144
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; dissolved silica; industrial water recycles; hydrotalcite; active alumina; water treatment

Citation Formats

Sasan, Koroush, Brady, Patrick V., Krumhansl, James L., and Nenoff, Tina M. Exceptional selectivity for dissolved silicas in industrial waters using mixed oxides. United States: N. p., 2017. Web. doi:10.1016/j.jwpe.2017.11.003.
Sasan, Koroush, Brady, Patrick V., Krumhansl, James L., & Nenoff, Tina M. Exceptional selectivity for dissolved silicas in industrial waters using mixed oxides. United States. doi:10.1016/j.jwpe.2017.11.003.
Sasan, Koroush, Brady, Patrick V., Krumhansl, James L., and Nenoff, Tina M. Tue . "Exceptional selectivity for dissolved silicas in industrial waters using mixed oxides". United States. doi:10.1016/j.jwpe.2017.11.003.
@article{osti_1411608,
title = {Exceptional selectivity for dissolved silicas in industrial waters using mixed oxides},
author = {Sasan, Koroush and Brady, Patrick V. and Krumhansl, James L. and Nenoff, Tina M.},
abstractNote = {The removal of silica, ubiquitous in produced and industrial waters, by novel mixed oxides is investigated in this present study. We have combined the advantage of high selectivity hydrotalcite (HTC, (Mg6Al2(OH)16(CO3)·4H2O)), with large surface area of active alumina (AA, (Al2O3)) for effective removing of the dissolved silica from cooling tower water. The batch test results indicated the combined HTC/AA is a more effective method for removing silica from CTW than using each of HTC or AA separately. The silica uptake was confirmed by Fourier transform infrared (FTIR), and Energy dispersive spectroscopy (EDS). Our results indicate HTC/AA effectively removes silica from cooling tower water (CTW), even in the presence of large concentrations of competing anions, such as Cl-, NO3- HCO3-, CO32- and SO42-. The Single Path Flow Through (SPFT) tests confirmed to rapid uptake of silica by combined HTC/AA during column filtration. The experimental data of silica adsorption fit best to Freundlich isotherm model.},
doi = {10.1016/j.jwpe.2017.11.003},
journal = {Journal of Water Process Engineering},
number = C,
volume = 20,
place = {United States},
year = {Tue Nov 07 00:00:00 EST 2017},
month = {Tue Nov 07 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on November 7, 2018
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Cited by: 1 work
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