Synthesis and Characterization Bimetallic Organic Framework CoxFex(BDC) and Adsorption Cationic and Anionic Dyes
, Cao Phuong Khanh Phan 3, Thi Cam Quyen Ngo 1,2, Ngoc Bich Hoang 1,2, Le Dang Truong 1,2 and Thi Kim Oanh Nguyen 1,2
Round 1
Reviewer 1 Report
Authors have synthesized Co-doped Fe-MOF bimetallic organic framework materials at different ratios and tested them as adsorbents for the removal of Methylene Blue (MB), Methyl orange (MO), Congo red (CR), and Rhodamine (RhB) from aqueous solution. Adsorption study was carried out along with a detailed characterization of absorbents. However, the following points need to be considered while revising the manuscript.
1. A detailed isotherm and kinetic study are missing in the manuscript.
2. Authors need to highlight adsorption mechanism in a separate section
3. Dye containing wastewater is not a single component system hence, effect of other contaminants like surfactant, salinity on dye removal process by the adsorbent plays an important role. This study is missing in the manuscript.
4. Authors need to compare the adsorption capacity of the adsorbents with the values reported in the literature
Author Response
Dear Editor and reviewers,
We would like to express our gratitude for the Editor and Reviewer’s efforts to improve the quality of our manuscript. We have tried our best to respond to all issues indicated in the review report sufficiently. In the revised version, we have highlighted the changes to our manuscript using the red color. The answers to the questions you raised are detailed here.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
In this paper, the authors have developed the Co-doped Fe-MOF adsorbents for the potential application of removing cationic and anionic dyes. The morphology and structure were characterized in detail and various dyes were used to evaluate the adsorption performance. I believe processes could accept this paper and the following suggestion could be considered.
1 The error bar of dye adsorption capacity should be given in the figures.
2 The effects of the size of the dyes and the pore structure of MOFs could be further discussed to develop better MOF adsorbents.
3 The kinetic data in Figure 5 could be fitted by kinetic models.
4 The paper could compare and discuss some important papers about the MOF absorbents and dye separation. Such as ACS Appl. Mater. Interfaces 2019, 11 (37), 33931; Chem. Eng. J. 2020, 384, 123347;
Author Response
Dear Editor and reviewers,
We would like to express our gratitude for the Editor and Reviewer’s efforts to improve the quality of our manuscript. We have tried our best to respond to all issues indicated in the review report sufficiently. In the revised version, we have highlighted the changes to our manuscript using the red color. The answers to the questions you raised are detailed here.
Author Response File: Author Response.pdf
Reviewer 3 Report
The whole manuscript should be revised to improve english, grammar fix spelling errors, etc
Introduction is a bit repetitive
Modification of the MOF with Co2+ ions is not clearly stated
Its better to annotate graphs so that it is easier to follow, eg XRD patterns
Author Response
Dear Editor and reviewers,
We would like to express our gratitude for the Editor and Reviewer’s efforts to improve the quality of our manuscript. We have tried our best to respond to all issues indicated in the review report sufficiently. In the revised version, we have highlighted the changes to our manuscript using the red color. The answers to the questions you raised are detailed here.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
Authors have made necessary corrections in the manuscript as per the suggestions.
