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Title: Conformal Nitrogen-Doped TiO 2 Photocatalytic Coatings for Sunlight-Activated Membranes

Abstract

Photocatalytic degradation of organic contaminants is enticing for addressing challenging, nontraditional water sources. A novel nitrogen-doping method is utilized to grow conformal titania coatings with visible-light activity on porous membranes. Here, the resulting membranes exhibit effective degradation of model organic species in simulated sunlight while at the same time requiring substantially lower transmembrane pressure than undoped membranes.

Authors:
 [1];  [1];  [2];  [3];  [1];  [1];  [4]
  1. Argonne National Lab. (ANL), Lemont, IL (United States)
  2. Univ. of Chicago, Chicago, IL (United States)
  3. Argonne National Lab. (ANL), Lemont, IL (United States); California State Univ. - Long Beach, Long Beach, CA (United States)
  4. Argonne National Lab. (ANL), Lemont, IL (United States); Univ. of Chicago, Chicago, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1393940
Alternate Identifier(s):
OSTI ID: 1401747
Grant/Contract Number:
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Advanced Sustainable Systems
Additional Journal Information:
Journal Volume: 1; Journal Issue: 1-2; Journal ID: ISSN 2366-7486
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 59 BASIC BIOLOGICAL SCIENCES; membranes; atomic layer deposition; photocatalysis; water treatment

Citation Formats

Lee, Anna, Libera, Joseph A., Waldman, Ruben Z., Ahmed, Aftab, Avila, Jason R., Elam, Jeffrey W., and Darling, Seth B. Conformal Nitrogen-Doped TiO2 Photocatalytic Coatings for Sunlight-Activated Membranes. United States: N. p., 2017. Web. doi:10.1002/adsu.201600041.
Lee, Anna, Libera, Joseph A., Waldman, Ruben Z., Ahmed, Aftab, Avila, Jason R., Elam, Jeffrey W., & Darling, Seth B. Conformal Nitrogen-Doped TiO2 Photocatalytic Coatings for Sunlight-Activated Membranes. United States. doi:10.1002/adsu.201600041.
Lee, Anna, Libera, Joseph A., Waldman, Ruben Z., Ahmed, Aftab, Avila, Jason R., Elam, Jeffrey W., and Darling, Seth B. Tue . "Conformal Nitrogen-Doped TiO2 Photocatalytic Coatings for Sunlight-Activated Membranes". United States. doi:10.1002/adsu.201600041. https://www.osti.gov/servlets/purl/1393940.
@article{osti_1393940,
title = {Conformal Nitrogen-Doped TiO2 Photocatalytic Coatings for Sunlight-Activated Membranes},
author = {Lee, Anna and Libera, Joseph A. and Waldman, Ruben Z. and Ahmed, Aftab and Avila, Jason R. and Elam, Jeffrey W. and Darling, Seth B.},
abstractNote = {Photocatalytic degradation of organic contaminants is enticing for addressing challenging, nontraditional water sources. A novel nitrogen-doping method is utilized to grow conformal titania coatings with visible-light activity on porous membranes. Here, the resulting membranes exhibit effective degradation of model organic species in simulated sunlight while at the same time requiring substantially lower transmembrane pressure than undoped membranes.},
doi = {10.1002/adsu.201600041},
journal = {Advanced Sustainable Systems},
number = 1-2,
volume = 1,
place = {United States},
year = {Tue Jan 24 00:00:00 EST 2017},
month = {Tue Jan 24 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

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  • Doped TiO{sub 2} particles were synthesized by solid grinding and sol-gel methods. The ensuing powders were analysed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and ground state diffuse reflectance absorption spectroscopy (GSDR). The doped samples prepared by solid grinding at 400 {sup o}C were in the anatase form, while those synthesised via sol-gel method and calcinated at the same temperature were dominated by the rutile phase. The X-ray photoelectron spectroscopy (XPS) revealed a surface segregation of the doping elements namely for Y, Rb and Rb-Y. The photocatalytic activity of the prepared catalysts, under sunlight irradiation, was evaluated using 2-naphtholmore » as a pollutant model. Results showed a great enhancement in the photocatalytic efficiency with incorporation of Y in samples prepared by solid grinding, while in samples prepared via sol-gel process both Rb and Y dopants greatly improve the photocatalytic activity. The Langmuir-Hinshelwood model was used to describe the photocatalytic reactions from which a pseudo-first-order kinetics was established. The repeatability of photocatalytic activity was also tested for several degradation cycles.« less
  • Highlights: ► The influence of Nd/N-doping on the sol–gel prepared TiO{sub 2} characteristics is described. ► The photocatalytic activity of the materials for dye degradation is established. ► The activity depends on the catalysts composition and synthetic conditions. ► The doping has a positive under UV and no or negative effect at solar irradiation. ► Degussa P25 TiO{sub 2} reveals high activity at sunlight illumination. -- Abstract: TiO{sub 2} doped with 0.1–10% Nd{sup 3+} or 1.8% nitrogen or co-doped with both dopants as well as Nd{sub 2}Ti{sub 2}O{sub 7} are synthesized by a sol–gel. The phase composition, crystal structure, morphology,more » optical properties and binding energies of the doped titania were investigated. The photocatalytic activity was tested for malachite green dye degradation and compared with the results obtained by dopant-free TiO{sub 2} synthesized using the same procedure and with the commercial Degussa P25 product. The influence of the dopant type and relative content, temperature of ignition in the course of the synthesis, pH of the reaction medium and the type of the illumination light on the efficiency of the prepared catalysts were determined. A positive effect of Nd- and N-doping on the apparent degradation rate constant under UV irradiation and negative one of Nd-presence at solar illumination is found. Nd–N-codoping has a negative effect on the photocatalytic activity.« less
  • Pure and Nb-doped TiO{sub 2} ceramic membranes supported on glass were prepared by sol-gel techniques. When irradiated with near-UV light, these membranes brought about the photocatalytic degradation of 3-chlorosalicylic acid (3-CSA). Relationships between preparation conditions and the characteristics and efficiencies of the different membranes have been inferred. The changes in the physical-chemical characteristics of these membranes when they are fired at high temperatures are retarded by both the Nb-doping and the coating on glass supports. Doping does not improve the rate of degradation of 3-CSA, despite the fact that light absorbance is higher. The increase of firing temperature causes anmore » increase in the size of membrane particles and a remarkable drop in the specific surface area, resulting in a substantial decrease in photochemical efficiency. A discussion based on the hypothesis of e/h recombination at grain boundaries and point defects of the membranes is presented.« less
  • This work provides the design and synthesis of nitrogen doped rutile TiO{sub 2} nanoparticles working as efficient photocatalysts under visible light irradiation. Nitrogen doped rutile TiO{sub 2} nanoparticles are synthesized through the surface nitridation of rutile nanoparticles, which have been prepared in advance. The experimental results show that the nitrogen element is easily doped into the lattice of TiO{sub 2} nanoparticles and its doping amount increases with the decrease of nanocrystallite size. The photocatalytic activity of the nanoparticles under visible light irradiation is correlated not only with the amount of doped nitrogen element but also with the morphology and crystallinitymore » of nanoparticles.« less