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Catalysts
Volume 12
Issue 6
10.3390/catal12060666
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Article
Peer-Review Record

Iron-Modified Titanate Nanorods for Oxidation of Aqueous Ammonia Using Combined Treatment with Ozone and Solar Light Irradiation

Catalysts 2022, 12(6), 666; https://doi.org/10.3390/catal12060666
by Silviu Preda 1, Polona Umek 2, Maria Zaharescu 1, Crina Anastasescu 1,*, Simona Viorica Petrescu 1, Cătălina Gîfu 3, Diana-Ioana Eftemie 1, Razvan State 1, Florica Papa 1,* and Ioan Balint 1,*
Reviewer 1: Anonymous
Reviewer 2:
Michael Arkas
Catalysts 2022, 12(6), 666; https://doi.org/10.3390/catal12060666
Submission received: 1 June 2022 / Revised: 14 June 2022 / Accepted: 15 June 2022 / Published: 17 June 2022
(This article belongs to the Special Issue Effect of the Modification of Catalysts on the Catalytic Performance)

Round 1

Reviewer 1 Report

In this paper, Preda et al. reported an aqueous ammonia oxidation process by using Fe modified titanate nanorodes combining with light and O3. It’s interesting to see the high NH3 removal activity and N2 selectivity for this system. However, some drawbacks also exist in this MS.

1.     The valence state of Fe on the Fe modified titanate nanorodes is unclear. I acknowledge that the procedure is the same as Fe2O3 nanocubes, but, from H2-TPR and NH3-TPD, it seems that these two samples have different Fe species. It is necessary to compare the Fe difference using XPS or EXAFS.

2.     In addition, how many Fe species has been adsorbed on nanorodes.

3.     How is the quantum yield for this process?

I believe this work can be suitable for Catalysts after addressing these questions.

Author Response

Please, find attached the response to the Reviewer.

Thank you!

Author Response File: Author Response.pdf

Reviewer 2 Report

The manuscript proposes catalytic titanate nanorods modified by iron cations for the selective transformation of NH3 to N2 in a combination of ozonation with photo-assisted catalytic oxidation. It is very well documented and merits publication after the following minor corrections.  

There are a few grammar errors. Please recheck.

Page 6 Lines 146-147 “clearly shows the improvement of light absorption for Fe TiR nanorods relative to the visible range, of.” Something is clearly missing here.

Page 13 Line 266 Please Check Reaction 5

Figures 12-13  “ncat” means no catalyst as indicated in the next. Please add it to the legend too.

Figures 12-15 Apart from the different types of fonts there is a slight difference in the fourth column in the percentage of NO3- (0.93 versus 0.91). Furthermore, the sum is not 100. Can you explain?

Author Response

Please, find attached the response to the Reviewer.

Thank you!

Author Response File: Author Response.pdf

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