Improving the Degradation Kinetics of Industrial Dyes with Chitosan/TiO2/Glycerol Films for the Sustainable Recovery of Chitosan from Waste Streams
Round 1
Reviewer 1 Report
Usage of films for degradation works is little risky .
Author Response
Manuscript title: Improving the Degradation Kinetics of Industrial Dye with Chitosan/TiO2/Glycerol Films for Sustainable Recovery of Chitosan from Waste Streams
Manuscript ID: sustainability-2292598
Author’s response to editors and reviewers’ comments
Dear Editors and Reviewers,
Foremost, we would like to thank you for your valuable comments and suggestions to improve the quality of this manuscript. We have incorporated these in the revised version of the manuscript. Our responses to the reviewers’ comments are as follows.
Reviewer 1
Usage of films for degradation works is little risky .
Response:
Thank you for sharing your thoughts on my paper on the degradation of industrial dyes with Chitosan/TiO2/Glycerol films. I appreciate your concerns about the risks associated with using films for degradation works. While it is true that any new technology or process carries some level of risk, I would like to assure you that our research has taken all necessary precautions to ensure the safety and effectiveness of our approach.
We have conducted extensive laboratory tests to optimize the conditions for degradation, and our results have shown that the combination of chitosan-glycerol (CTiG) film with titanium dioxide was more effective than pure chitosan film or chitosan-glycerol film, with up to 83% degradation of NWY achieved in just 60 minutes of visible solar irradiation. Additionally, we have used Langmuir-Hinshelwood and pseudo-first-order kinetics models to evaluate the kinetics of the film, and we found that the rate constant values decreased with increasing NWY concentration.
We understand that the safe and effective treatment of industrial wastewater is of utmost importance, and we hope that our research will contribute to the development of more sustainable methods for the degradation of dyes from textile industry wastewater. Thank you again for your valuable feedback.
Reviewer 2 Report
In the manuscript entitled "Improving the Degradation Kinetics of Industrial Dye with Chitosan/TiO2/Glycerol Films for Sustainable Recovery of Chitosan from Waste Streams" submitted by N. T. T Hoang and D. D. Nguyen the authors described the preparation and testing of chitosan-glycerol film combined with titanium dioxide. In the work, the structure of film was thoroughly characterized and surface morphology were presented. The photocatalytic activity of the material against azo dye like Near Wash Yellow under the influence of visible solar irradiation was tested. The work is experimental in nature.
The manuscript is clear and generally well-written, but some improvements should be produced. For this reason, I recommend the publication of this manuscript on Sustainability after the following minor revisions:
· In the Introduction section, the author should clearly state what is new in the work;
· Please check the numbering of Tables and Figures as there are errors in the text;
· Figures 5 and 6 require a more precise caption;
· The EDS spectra in Fig. 7 are illegible. This should be improved;
· Add a comment to equations 1, 2 and 3;
· In section 3.3.2. there are repetitions of the text, this should be corrected;
· In Conclusion section is repetition of the text too;
· On the basis of which results information was included in the Conclusion section about the optimal TiO2/chitosan ratio was 4%? Please provide these results.
Author Response
Manuscript title: Improving the Degradation Kinetics of Industrial Dye with Chitosan/TiO2/Glycerol Films for Sustainable Recovery of Chitosan from Waste Streams
Manuscript ID: sustainability-2292598
Author’s response to editors and reviewers’ comments
Dear Editors and Reviewers,
Foremost, we would like to thank you for your valuable comments and suggestions to improve the quality of this manuscript. We have incorporated these in the revised version of the manuscript. Our responses to the reviewers’ comments are as follows.
In the manuscript entitled "Improving the Degradation Kinetics of Industrial Dye with Chitosan/TiO2/Glycerol Films for Sustainable Recovery of Chitosan from Waste Streams" submitted by N. T. T Hoang and D. D. Nguyen the authors described the preparation and testing of chitosan-glycerol film combined with titanium dioxide. In the work, the structure of film was thoroughly characterized and surface morphology were presented. The photocatalytic activity of the material against azo dye like Near Wash Yellow under the influence of visible solar irradiation was tested. The work is experimental in nature.
The manuscript is clear and generally well-written, but some improvements should be produced. For this reason, I recommend the publication of this manuscript on Sustainability after the following minor revisions:
Response:
We very much appreciate the reviewer’s constructive and very helpful comments to improve our manuscript. Based on the comments and suggestions from all the reviewers', we have revised the manuscript accordingly and tried to explain our research better what is within our knowledge to do so. We sincerely hope that this paper provides insightful information to the reader, so that new research directions can be focused on, in the future more easily.
1) · In the Introduction section, the author should clearly state what is new in the work;
Response:
We have partially modified the introduction and also added more the relevant information in an effort to provide more clarity about the novety of this research.
2)· Please check the numbering of Tables and Figures as there are errors in the text;
Response:
Thank you, we have revised as suggested
3)· Figures 5 and 6 require a more precise caption;
Response:
The captions for Figs 5-6 have been reviewed and edited.
4)· The EDS spectra in Fig. 7 are illegible. This should be improved;
Response:
Thanks, the EDS image with clearer quality has been newly replaced.
5)· Add a comment to equations 1, 2 and 3;
Response:
Thank you for this comment. We have now added additional information to the revised manuscript as suggested
6)· In section 3.3.2. there are repetitions of the text, this should be corrected;
Response:
Thank you, we have corrected these errors in the revised manuscript as suggested.
7)· In Conclusion section is repetition of the text too;
Response:
Thank you, we have corrected these errors in the revised manuscript as suggested.
8)· On the basis of which results information was included in the Conclusion section about the optimal TiO2/chitosan ratio was 4%? Please provide these results.
Response:
Thank you for this comment. We have now added specific reseults and additional information to the revised manuscript as suggested
Reviewer 3 Report
This work presented sustainable methods for the degradation of dyes from textile industry wastewater. So that, Chitosan/TiO2/Glycerol films was conducted in both batch and continuous-flow experiments under visible solar irradiation. Results indicated that this combination was more effective than pure chitosan film (60%) or chitosan-glycerol film (63%), with up to 83% degradation of NWY achieved in just 60 minutes of visible solar irradiation. The kinetics of the film were evaluated using both pseudo-first-order kinetics and Langmuir-Hinshelwood kinetics models. The rate constant values (k, min-1 ) decreased with increasing NWY concentration from 20 to 80 mg/L, and the k was found to be greater than twice as high under visible solar irradiation as it was in the dark. The Langmuir-Hinshelwood model's KLH (reaction rate constant) and KL (adsorption coefficient) values were 0.029 mg/L.min and 2.241 L/mg, respectively. The optimal conditions for NWY degradation were found to be 4% TiO2 to chitosan ratio, glycerol/chitosan ratio of 40%, and a pH of 7. In the continuous-flow model, the CTiG film was submerged in an 8-liter NWY solution (80 mg/L) and degraded at a rate of 22.6 mg NWY/g film under natural sunlight. The paper is well organized with good motivation and could be accepted for publication in its present form.
Author Response
Manuscript title: Improving the Degradation Kinetics of Industrial Dye with Chitosan/TiO2/Glycerol Films for Sustainable Recovery of Chitosan from Waste Streams
Manuscript ID: sustainability-2292598
Author’s response to editors and reviewers’ comments
Dear Editors and Reviewers,
Foremost, we would like to thank you for your valuable comments and suggestions to improve the quality of this manuscript. We have incorporated these in the revised version of the manuscript. Our responses to the reviewers’ comments are as follows.
This work presented sustainable methods for the degradation of dyes from textile industry wastewater. So that, Chitosan/TiO2/Glycerol films was conducted in both batch and continuous-flow experiments under visible solar irradiation. Results indicated that this combination was more effective than pure chitosan film (60%) or chitosan-glycerol film (63%), with up to 83% degradation of NWY achieved in just 60 minutes of visible solar irradiation. The kinetics of the film were evaluated using both pseudo-first-order kinetics and Langmuir-Hinshelwood kinetics models. The rate constant values (k, min-1 ) decreased with increasing NWY concentration from 20 to 80 mg/L, and the k was found to be greater than twice as high under visible solar irradiation as it was in the dark. The Langmuir-Hinshelwood model's KLH (reaction rate constant) and KL (adsorption coefficient) values were 0.029 mg/L.min and 2.241 L/mg, respectively. The optimal conditions for NWY degradation were found to be 4% TiO2 to chitosan ratio, glycerol/chitosan ratio of 40%, and a pH of 7. In the continuous-flow model, the CTiG film was submerged in an 8-liter NWY solution (80 mg/L) and degraded at a rate of 22.6 mg NWY/g film under natural sunlight. The paper is well organized with good motivation and could be accepted for publication in its present form.
Response:
The authors greatly appreciate the reviewer’s approval on our manuscript for publication. The authors also sincerely hope that this paper provides insightful information for readers.
Reviewer 4 Report
I accept the manuscript to be published after major revision. The research work is interesting, but some points must clarified before publications
1-More physicochemical characterization of the photocatalyst are required as BET, Zeta potential,--------to investigate the properties of the composite
2-What is the chemical interaction between chitosan and titania
3-The novelty of research work must be clearly represented in the introduction section
4-Total organic carbon or chemical oxygen demand is required to confirm the destruction of pollutants rather than decolorization process
5-The photocatalytic mechanism can add to the revised manuscript
Author Response
Manuscript title: Improving the Degradation Kinetics of Industrial Dye with Chitosan/TiO2/Glycerol Films for Sustainable Recovery of Chitosan from Waste Streams
Manuscript ID: sustainability-2292598
Author’s response to editors and reviewers’ comments
Dear Editors and Reviewers,
Foremost, we would like to thank you for your valuable comments and suggestions to improve the quality of this manuscript. We have incorporated these in the revised version of the manuscript. Our responses to the reviewers’ comments are as follows.
I accept the manuscript to be published after major revision. The research work is interesting, but some points must clarified before publications
Response:
Thank you very much for your feedback and for considering our manuscript for publication. We appreciate your positive assessment of our research work and we are committed to addressing the points you raised in a thorough. We will carefully consider your comments and revise our manuscript accordingly to ensure that it meets the required standard.
1-More physicochemical characterization of the photocatalyst are required as BET, Zeta potential,--------to investigate the properties of the composite
Response:
Thank you for your valuable comment. We appreciate your suggestion for further physicochemical characterization of the photocatalyst, including BET and Zeta potential analysis to gain a better understanding of the properties of the hybrid materials obtained. However, we regret to inform you that we have not conducted these specific tests in our study. We will take your feedback into consideration for our future studies.
2-What is the chemical interaction between chitosan and titania
Response:
The interaction between chitosan and titania in the Chitosan/TiO2/glycerol film is likely a physical interaction, while the chemical interaction is between chitosan and glycerol.
3-The novelty of research work must be clearly represented in the introduction section
Response:
The novelty of the study has been further emphasized in the introduction of the revised manuscript, and some parts of the manuscript have been rewritten to better reflect the original contributions of the research.
4-Total organic carbon or chemical oxygen demand is required to confirm the destruction of pollutants rather than decolorization process
Response:
Thank you for your valuable comment and suggestion. We agree that total organic carbon or chemical oxygen demand measurements would provide a more comprehensive understanding of the degradation of pollutants in the wastewater. However, we did not include these measurements in our study due to resource limitations and the focus on decolorization as a primary parameter. We hope to investigate the additional parameters you have suggested in future studies to further enhance the understanding of the efficiency of the Chitosan/TiO2/glycerol film in the treatment of wastewater.
5-The photocatalytic mechanism can add to the revised manuscript
Response:
Thank you for your comment, we have presented and explained the photocatalytic mechanism of the Chitosan/TiO2/glycerol film using the Langmuir-Hinshelwood model in sections 3.3.1 and 3.3.2.
Reviewer 5 Report
1. A brief scheme of Near Wash Yellow need to be given in Fig. 1. Search more advance synthesis route and final structure.
2. put the innovation of your work along with comparison with previous reported work in the last paragraph of your introduction.
3. Fig. 4 has not been discussed anywhere. Mention it and discuss well.
4. In paper there are many individual figures, please embedding figures among each other to better the quality of paper, such as morphology section need to be together as one figure and same the structural analysis needs to be one and same the performance needs to be one or maximum two figures.
5. Researchers have shown the instruments on which they conduct the degradation process such as Fig. 3, but they need to provide a descriptive graphical abstract to show the pathway of photogenerated holes in the valence band (VB) of your materials and its associated mechanism and also give a separate topic to discuss scientifically.
6. Many places have typos error and superscript (upper, lower). Make the format as uniform of whole paper and proper focus toward the scientific English.
7. Provide a table for comparison your work with previous reported one.
I recommend the minor revision. All the best.
Author Response
Manuscript title: Improving the Degradation Kinetics of Industrial Dye with Chitosan/TiO2/Glycerol Films for Sustainable Recovery of Chitosan from Waste Streams
Manuscript ID: sustainability-2292598
Author’s response to editors and reviewers’ comments
Dear Editors and Reviewers,
Foremost, we would like to thank you for your valuable comments and suggestions to improve the quality of this manuscript. We have incorporated these in the revised version of the manuscript. Our responses to the reviewers’ comments are as follows.
- A brief scheme of Near Wash Yellow need to be given in Fig. 1. Search more advance synthesis route and final structure.
Response:
Thank you. We appreciate your suggestion to include a brief scheme of Near Wash Yellow in Fig. 1, and we will revise the manuscript accordingly and will definitely consider this in our next revision of the manuscript. Regarding the studies for more advanced synthesis routes and the final structure of Near Wash Yellow, we would like to clarify that the focus of this study was on the degradation of synthetic wastewater containing NWY using Chitosan/TiO2/glycerol films. However, we will take note of your suggestion for future studies on the synthesis and structures of NWY.
- put the innovation of your work along with comparison with previous reported work in the last paragraph of your introduction.
Response:
Thank you. We have revised introduction part with emphasizing on the scientific novelty of the work. Please see the highlight in the manuscript
- Fig. 4 has not been discussed anywhere. Mention it and discuss well.
Response:
We apologize for the oversight regarding Figure 4. We have now included a discussion of Figure 4 in the revised manuscript.
Round 2
Reviewer 2 Report
I appreciate all the responses given by the authors. I recommend the publication of the manuscript.
Reviewer 4 Report
The revised manuscript is very appropriate for publication. I accept to publish this manuscript
