Use of Kiwi Waste as Fuel in MFC and Its Potential for Use as Renewable Energy

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

1- For the configuration of the MFC you have talked about the two electrodes connected to an external resistor. Generally the constriction of a cell also requires the membrane, so did you use a membrane? if yes, what type of membrane was used?

2- In the results section, please discuss more about the mechanism of operation of the MFC, electron transfer and electricity generation.

3- For the FTIR analysis, you mentioned that all the observed peaks decreased at the end of the MFC-SC monitoring, which is not really visible on the IR spectrum.

4- Check the format for the cited references, the references cited from 1 to 55 without DOI, and from 55 to 67 the references are cied with DOI. so please homogenize the list of references.

No comment

Author Response

Dear colleague, the authors appreciate your comments to improve the manuscript.
Changes were made and each comment answered:

1- For the configuration of the MFC you have talked about the two electrodes connected to an external resistor. Generally the constriction of a cell also requires the membrane, so did you use a membrane? if yes, what type of membrane was used?
Ans. If it was separated by a proton exchange membrane, Nafion 117., is added in section 2.1

2- In the results section, please discuss more about the mechanism of operation of the MFC, electron transfer and electricity generation.
Ans. I know several lines, from 181 to 198 as well as references.

3- For the FTIR analysis, you mentioned that all the observed peaks decreased at the end of the MFC-SC monitoring, which is not really visible on the IR spectrum.
Ans. The person in charge of the graph placed the wrong spectrum, it was corrected.
4- Check the format for the cited references, the references cited from 1 to 55 without DOI, and from 55 to 67 the references are cited with DOI. so please homogenize the list of references.
ANS. DONE

kind regards

Reviewer 2 Report

The authors studied the the performance of MFC using the kiwi waste, and showed the high bioelectricity with a voltage of 2.85V. However, the present version is not allowed for considering publication. The results and discussion were written too simply, with only electricity production data and microbial data. There is a lack of specific sections, water quality experiments, and supporting relevant data. In addition, 1.The metal electrodes (Cu, Zn) are generally prone to corrosion. Did the author modify these metal electrodes and what catalysts were used. Therefore, I suggest that the authors need to make thorough and complete revisions to meet the standards of publication.

Moderate editing of English language

Author Response

Dear colleague, the authors appreciate your comments to improve the manuscript.
Changes were made and each comment answered:

The authors studied the the performance of MFC using the kiwi waste, and showed the high bioelectricity with a voltage of 2.85V. However, the present version is not allowed for considering publication. The results and discussion were written too simply, with only electricity production data and microbial data. There is a lack of specific sections, water quality experiments, and supporting relevant data. In addition, 1.The metal electrodes (Cu, Zn) are generally prone to corrosion. Did the author modify these metal electrodes and what catalysts were used. Therefore, I suggest that the authors need to make thorough and complete revisions to meet the standards of publication.

Ans. Ans. Dear colleague, the zinc electrode used as a probe showed corrosion in recent days, and catalysts were not used because it was intended to represent the potential of this waste in energy generation without any addition, this was increased in the manuscript. For further investigation, different biocatalysts will be used in order to increase the power of the cells.
Several parts of the manuscript were added and modified:
The abstract was rewritten, as well as the following lines were increased: 13 to 15, 90-94, 140-142, 181-198, 272-284,292-304,316-317

kind regards

Reviewer 3 Report

The article "Use of kiwi waste as Fuel in MFC and its Potential for Use as renewable energy" has been reviewed. Please address the following problems:

1. The Abstract of this article should be rewritten. Please be precise and eliminate unnecessary sentences. 

2. In the Introduction section, cite the previous work done in this area, such as Carbon quantum dots-embedded graphitic carbon nitride nanotubes for enhancing the power conversion efficiency of sensitized solar cells. Materials Today Chemistry, 24, p.100763.    O, Sg-C3N4 nanotubes as photovoltaic boosters in quantum dot-sensitized all-weather solar cells: a synergistic approach for enhanced power conversion efficiency in dark-light conditions. Materials Today Chemistry, 26, p.101125. "Biogas production by anaerobic codigestion using kiwi waste and wine sludge." In WASTES: Solutions, Treatments, and Opportunities-5th International Conference. 2019.

3. Mention all the conditions under which the Biofuel cell was fabricated. 

4. I could not see any characterization of the Kiwi waste. is this not necessary?

5. improve the Figure quality. 

6. Revise and manuscript to eliminate typos and grammatical mistakes. 

6. Revise and manuscript to eliminate typos and grammatical mistakes. 

Author Response

Dear colleague, the authors appreciate your comments to improve the manuscript.
Changes were made and each comment answered:

The article "Use of kiwi waste as Fuel in MFC and its Potential for Use as renewable energy" has been reviewed. Please address the following problems:
1. The Abstract of this article should be rewritten. Please be precise and eliminate unnecessary sentences.
Ans. It was rewrote
2. In the Introduction section, cite the previous work done in this area, such as Carbon quantum dots-embedded graphitic carbon nitride nanotubes for enhancing the power conversion efficiency of sensitized solar cells. Materials Today Chemistry, 24, p.100763. Or, Sg-C3N4 nanotubes as photovoltaic boosters in quantum dot-sensitized all-weather solar cells: a synergistic approach for enhanced power conversion efficiency in dark-light conditions. Materials Today Chemistry, 26, p.101125. "Biogas production by anaerobic codigestion using kiwi waste and wine sludge." In WASTES: Solutions, Treatments, and Opportunities-5th International Conference. 2019.
Ans. It was added
2. Mention all the conditions under which the Biofuel cell was fabricated.
Ans. It was placed in the methodological part, the authors placed everything there. S
4. I could not see any characterization of the Kiwi waste. is this not necessary?
Ans. It was not carried out, due to the initial sterilization of the waste to eliminate impurities from the environment. On the initial components of the same fruit, no initial characterization was carried out because it is not necessary or has not been reported in the literature. But for a further investigation it will be taken into account.

5. improve the Figure quality.
Ans. done

6. Revise and manuscript to eliminate typos and grammatical mistakes.
Ans. done

kind regards

Round 2

Reviewer 1 Report

The authors are asked to provide more details about the questions of referee. Some answers are not acceptable such as for FTIR remarks. References added are presented in wrong way. 

Be careful to mind about your revision. 

 No comment

Reviewer 2 Report

No comments

Reviewer 3 Report

This manuscript can be accepted in its present form.