Dynamic Adsorption of H2S onto a Goethite-Based Material
Round 1
Reviewer 1 Report
Major revision needed.
1. “It should be noted here, that the shape of the curves showed in Figs 1 and reasonably resembled some figures relatives to the COVID-19 infection trajectory for grand average over forty countries.” This paragraph seems to have little to do with the article. What do you want to express?
2. This model is proposed under the conditions of H2S feed concentration (150~600 mg), adsorbent dosage (1~4 g) and gas flow rate (210~540 cm3/min). Is there any limitation? I think other data conditions in this range can be selected to further verify the theoretical models.
3. The conclusion does not reflect the innovation of this study and the application prospect in this field, so it is recommended to modify it.
4. The font format of the legend in the article is not standard, and the title of the picture is not clear (e.g. Experimental conditions as in Fig.1.), so it is recommended to carefully sort out the full text for correction.
5. The data in the table of the article is incorrect. Please distinguish "、" and "." (e.g.Table 3), and pay attention to the modification of similar details.
6. The language of lines 117 and 118 is not clear, so it is suggested to change them into two sentences, and pay attention to modifying similar problems.
Author Response
Please see attached file. Changes in the manuscript are marked in red.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
This work studied the Goethite dynamic H2S adsorption behavior by varying parameters such as adsorbent amount, H2S feed, and flow rate, and built theoretical models to verify this adsorption process. This manuscript can be accepted after the following comments are addressed.
For a research article, the current number of references is too few. Several of the recent work reporting high H2S adsorption capacities should be cited, especially for metal oxides working in the low to medium temperature ranges, including 10.1021/acs.energyfuels.8b00532, 10.1021/acs.iecr.1c02715, 10.1016/j.jhazmat.2017.02.050.
In line 134, a typo, “steeper” not “stepper”.
Figure 4 and Figure 16 can be combined to allow a better comparison before and after H2S adsorption.
There are too many figures in the main text, some of the figures can be combined to make a composite figure, or moved to the supporting information.
In Figure 17, the underlines need to be removed, and some typos should be corrected.
For the XRD in Figure 16, where is crystalline SiO2 coming from? Does Goethite usually occur with quartz? And where is the quartz in Figure 4 after H2S adsorption?
Author Response
Please see attached file. Changes in the manuscript are marked in red.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
The paper has been improved to some extent, however, my two questions No 4 and No 5 were not addressed, please response and revise the paper in accord.
Author Response
Thank you for your comments. We amended the manuscript hoping that you agreed with our amendments. These are marked in the red in the revised manuscript.
