Hello

There is definitely a change in the structure of the surface layer. To be useful, it is good to say whether both pictures are from a test and what is it? What is the receipt method and the delay mode?

Thanks Yankov sir

First one is SEM image of dry powder of husk and next is the carbonized form of husk.

Dear Manisha,

comparison of the two SEM images is possible if they are of the same magnification.

To examine the modification of the surface structure of the biochar due to treatment, it is necessary to have SEM image of the treated sample (image b) taken as individual particle shown in image a.

In this way, there should be possible to examine the existence of cracks, kinks etc after treatment. Such surface defects could be responsible for the increase in adsorption capacity of the agro-waste tested.

I hope my suggestion could help.