Respected sir/madam,
Let me introduce myself as Anjali, a research scholar from India who just started PhD work in the last 2 months. I have been given my tentative research title as "Photolysis induced Hydrogen generation from water by Graphitic Carbon Nitride and related hybrid" . During literature review for the above topic I have gone through some related papers and found interesting. However as a beginner i have some basic queries before starting my work which are the following;
1. Hydrogen generation is possible from pure water or some suitable activator has to be added and why. I have found article where Na2S and NaSO3 is added to water before starting the experiment.
2. Is it necessary to immerse the light source into the water or light can be sent from above also (as in our reactor we have the reactor vessel with a large capacity around 1L and thus if we want to place the light within the water it will require a very high quantity of material).
3. Our reactor has 3 outlets and I have planned to externally seal two of them and the third outlet will be released within the water taken in a beaker through a suitable connector. Can I expect a bubble formation in the beaker even when the quantity of the evolved gas is very less.
It will be very helpful for me if you kindly find a precious time to answer my above-mentioned queries at the earliest so that I can start my experimental work accordingly.
Waiting for your kind answer.
Humble Regards
Thank you
Anjali
I am working on gas sensor so I can answer your 3 question. I have observed that bubbles will form even for low concentration of hydrogen gas.
1. since you are working on gC3N4, you must find the proper solvent for the H2 production. mostly reports are on water with a hole scavenger. however, water, methanol, ethanol or the mixtures can be used. Trying in different solvents also a course of your PhD study.
2. You can do both. the idea is the light (photons) should hit on the solvent. and the materials dispersed. if you keep a light source outside the reactor, ensure the light goes inside. I would say the light-passing area should be made of quartz.
3. if you are seeing the bubbles inside your reactor, then most probably, you have not vacuumed/degassed properly. Use a vacuum pump to remove the gas inside your reactor prior to the experiment. from the experimental knowledge I have never seen bubbles inside the reactor once the reaction process starts, ( after the vacuum ) )
good luck
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