ATOM INDONESIA
Editor’s Report
Article No. : # 514
Title of Paper : SYNTHESIS OF NANO α-AL2O3 FOR 99Mo ADSORBENT
Comment on Descriptions 1. Title
[X] Appropriate [ ] Should be changed
2. Abstract
Yes[X] No[ ] Is the length reasonable?
Yes[X] No[ ] Is it an appropriate summary of the content?
3. Main Text
Yes[ ] No[X] Is there anything new in this work?
Yes[ ] No[X] Is the relation to previous studies adequately stated?
Yes[X] No[ ] Are the assumption(s) and/or method(s) described comprehensively?
Yes[X] No[ ] Are the new results adequately emphasized?
Line # Referee’s Comments
9
Therefore, in this study nano material of alumina (nano α-Al2O3) was synthesized which was expected having higher 99Mo adsorption capacity. Nano α-Al2O3 was reported to potentially be used as a matrix of columns for 99Mo/99mTc generator. Nano α-Al2O3 was synthesized by using sol-gel method and characterized using FT-IR spectroscopy, X-ray Diffraction (XRD) and Transmission Electron Microscope (TEM). In addition, Scherrer method was used to determine the size of the crystals. To determine the 99Mo adsorption capacity of the synthesized nano alumina, the nano α-alumina was soaked in nitric acid solution for 1 hour at room temperature then followed by removing of the filtrate. Then the nano α-alumina was soaked in 99Mo solution (Na2
99MoO4) at certain conditions. The FT-IR spectra for nano α-alumina showed adsorption peak at 450-500 cm-1 which indicated the presence of Al-O bond. The XRD patterns of nano alumina crystals showed peaks at 2θ region of 25.8 °, 35.9 °, 38 °, 52.8 °, and 57.7 ° indicating that the synthesized alumina had an α-phase with an average crystal size of ~ 5.5 nm. The average 99Mo adsorption capacity of the synthesized alumina was 47.55 ± 12.3 mg Mo/g nano α-Al2O3. The 99Mo adsorption capacity of the nano α-alumina is still much smaller than the expected result, which is amounted to 250 mg Mo/g nano α-alumina. Therefore, in the next experiment, will be synthesized the nano α-Al2O3 which can be expected having better 99Mo adsorption capacity
35-36 the activatednatural molybdenum based 99Mo/99mTc generator 123 Some alumina-based materials are reported to have been … 157 HighScore Plus Software is was …
162 Material used in this study included ….
230 chemical reaction occurs 237 chemical reaction occurs 301-
302 What is the average actual size of the alumina nanoparticles?
346-
347 Who said adsorption capacity of up to 200 mg Mo/g alumina? Need reference(s) here!
338- 367
We cannot see any optimized results here since the adsorption capacities are both well below 200 mg Mo/g alumina.
Final comments and recommendations:
While nano-α-Al2O3 has been widely and commercially available, this research has shown no improvement in the adsorption capacity. Also, there is no comparison with other previous investigations. Lack of novelty is also one of the pitfalls of this research, including the negative results (bad adsorption capacity). The authors are required to do the followings:
(1) Revise the manuscript based on the reviewer(s) suggestions
(2) Add up some discussion on comparing the authors results with previous results
This paper is recommended to be [ ] Accepted without further revision [ ] Accepted with minor revision [X] Major Revision is required [ ] Rejected
