I degraded Methylene blue dye with copper base nanoparticles. but they degraded the MB in 24 hours. so should I do kinetics and relative graph by giving a 1-hour difference? and I want to calculate rate kinetics... should I give one hour difference?
The study of the reaction kinetics is not as simple as you think. The simplest reaction rate law is d[MB]/dt = -k(app) [MB]^n. The best is to have as many as possible points on the curve [MB] versus time. Then, you have to process your data. The simplest would be to vary the initial concentration of MB and plot the initial d[MB]/dt versus [MB]o and see how it looks like. "Rate kinetics" does not exist. The "kinetics" or "kinetic curve" is the plot [MB] versus time. If you don't know the basics of chemical kinetics, just don't perform the kinetic studies.
Hi,
Since the degradation occurred in 24 hours, it was necessary to measure at least every 4 hours, so you got 6 measurements, and it is suitable for calculating the degradation rate by the following equation:
D%=(dye'0'-dey'x.h')/dey'0'
However, these data change if you use improvers on copper powder. The same measurement time should be taken, for example every 1 or 2 hours, for all samples (according to the effectiveness of the powders) in order to compare them.
Dikra Bouras Your formula is not clear and seems to be wrong. Chnage the initial concentration of MB and see what your formula gives
Dear Yurii V Geletii I used the word dye to show that the variable is the solution.
The statement is valid and normal, and is unique for calculating the Degradation rate of the contaminated solution There are many calculation methods and this is one of them:
D%=((A0-A)/Ao)*100
regards
Dear Dikra Bouras, you have given the equation for the conversion of dye. This equation cannot be used as such for calculation of rate of degradation of dye. For the rate of degradation you need to follow the degradation in the time domain and then time-concentration or time-conversion data may be used find the rate of degradation.
This has never been a simple business to elucidate the rate of a chemical process and needs a lot of careful experimentation and subsequent data analyses.
Dear Mumtaz Danish, the equation is associated with time. This is inevitable because we need to take a sample of the solution, perhaps as an hour or minutes, depending on the effectiveness of the catalyst ( i did not explain the process thoroughly).
you can also use ln C0/C, and it gives you more accurate results. Also, you can repeat the dye decomposition process several times, not just once, to also make sure that it gives the same effectiveness every time.
Best regards
Dikra Bouras
this is an equation for the conversion, but not for the rate. Where did you learn kinetics of chemical reactions?
The photo-degradation rate of methylene blue (MB) was calculated by the following Eq. (1) [19]:(1) Degradation ( % ) = A 0 − A t A 0 × 100 where A0 is the absorbance of initial MB; At is the absorbance of the solution after illumination at time t.
Chuck A Arize Again the plagiarism? Eq. 1 from the ref [19], which you don't provide. Eq 1 is not for the rate but for conversion.
- Badges
- Science method
- Similar topics
- Methodology