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Prussian blue as a co-catalyst for enhanced Cr (VI) photocatalytic reduction promoted by titania-based nanoparticles and aerogels

Journal Article · · New Journal of Chemistry
DOI:https://doi.org/10.1039/d1nj01141c· OSTI ID:2282833
 [1];  [2];  [3];  [4];  [4];  [5];  [3]
  1. Univ. of Sao Paulo (Brazil); Sao Paulo State University (UNESP) (Brazil)
  2. Sao Paulo State University (UNESP) (Brazil); Univ. of Peshawar (Pakistan); Federal University of Mato Grosso do Sul (Brazil)
  3. Univ. of Sao Paulo (Brazil)
  4. Sao Paulo State University (UNESP) (Brazil)
  5. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Hexavalent chromium (Cr(VI)) is an noxious and highly toxic heavy metal that presents a serious threat to human health if present even in low concentrations in drinking water. Photocatalytic reduction of Cr(VI) to its less toxic Cr(III) state is a potential strategy to combat Cr(VI) pollution, but the efficiency of the process is low, especially in the absence of hole scavenger organic reagents. To address this issue and prepare efficient photocatalysts for Cr(VI) removal from water, in this study, we explored Prussian blue (PB) as a co-catalyst for improving the photoreduction performance of different high surface area TiO2-based materials (titania or silica–titania nanoparticles and aerogels). Here, the photocatalyst nanomaterials were surface-modified with nanocrystalline PB using the photodeposition route. The PB layer acts as an effective electron acceptor/mediator between the semiconductor photocatalyst and Cr(VI) species. All the PB-modified photocatalysts exhibit higher photocatalytic activity (up to 9 times faster) as compared to the unmodified photocatalysts towards reduction of Cr(VI). Importantly, the PB-modified photocatalysts exhibited high photocatalytic performance (98–99% reduction in 40 min for pH = 5.6 and in 10 min for pH = 3) without addition of organic reagents. The simple approach reported herein can be followed to prepare new PB-photocatalyst systems with improved photocatalytic performance towards Cr(VI) reduction and other target applications.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
2282833
Alternate ID(s):
OSTI ID: 1788133
Report Number(s):
LLNL--JRNL-843437; 1066070
Journal Information:
New Journal of Chemistry, Journal Name: New Journal of Chemistry Journal Issue: 23 Vol. 45; ISSN 1144-0546
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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