The photocatalysis was done using nano zinc oxide coated activated carbon at neutral pH using 0.3g of catalyst. Eventhough the solution doesnt show full decolourisation(it shows pale blue colour) the absorbance value is shown as 0 after 45 minutes of treatment. The initial concentration was 50 mg/l and dilution factor of 20 was adopted.Since the solution is still coloured can this value be reported as 100% degradation?
Aaisha Jabeen
MB dye absorbs in the visible part of the spectrum, and you use a UV spectrometer.
Jawad RA, Shiltagh N, Aboud LH, Watkins MJ. 2021. The Effect of Silver Nanoparticles on a Mixture of MB-dye/PVAPolymer as Determined by Absorption and Emission Spectra Measurements. NanoWorld J 7(1): 13-21.
Aaisha Jabeen My question supports the comment of Yuri Mirgorod .
What wavelength are you monitoring the absorbance?
You have 50 mg/l and it is diluted 20 times making it 2.5 mg/l. If you destroy/remove more than 50% you are close to the detection limit. Don't dilute so much and measure again. Activated carbon itself is good for removing MB so You might have a combined effect of catalyst and AC adsorption making the removal even faster.
Aaisha Jabeen You asked this question a week ago on January 18th and still no response from you to a couple of simple questions. I trust you are well and not on vacation...
MB is a standard substance (one of them) used for testing activated carbons. There are a large number of publications available for these measurements. One point is that MB is strongly adsorbed onto glassware. Even if washed glass is not clean. There must be some final cleaning using ethanol or acetone. This cleaning includes the cuvettes too.
- Badges
- Science topic
- Similar topics
- Engineering
- Materials Engineering
- Coating