Effect of Ammonia Water Concentration on the Surface Morphology of Activated Carbon from Nutshell
Before modification, there are many debris on the surface of the activated carbon from the shell, and some of the debris is directly filled in the holes. After modification with 5% ammonia water, the surface debris of activated carbon is significantly reduced and recessed, a large number of grooves appear, and a large number of holes are distributed in these grooves. yongruida activated charcoal pellets These holes are caused by continuous burning of microcrystalline carbon and frequent replacement of new and old pores. The product, and the distribution is relatively uniform, the pore size is about 1.1μm.
As the ammonia concentration increases to 10%, the surface impurities of the modified activated carbon are further reduced, the grooves are clearly evenly distributed, the pore edge morphology is clearer, and the pore size uniformity is slightly worse than that of the 5% ammonia modified sample. Seeing the phenomenon of "holes in the holes", the holes are not completely transparent, and there is a layer of holes inside, which can significantly increase the specific surface area of the activated carbon.
After modification with 15% ammonia water, the surface morphology and structure of activated carbon changed significantly. After the alkalinity was strengthened, the trench was corroded more severely and the structure almost disappeared. 0.9μm.
After modification with 20% ammonia water, the recesses are deepened and a more complete groove structure is regained. The pores are distributed more uniformly, and the size is further reduced, about 0.6μm.https://www.powdered-activated-carbon.com/
The above phenomenon occurs mainly because the ammonia water has a certain corrosive effect on the surface of the activated carbon from the shell, which can corrode the pore wall of the surface of the activated carbon. Within a certain range, with the increase of the ammonia concentration, the corrosion degree of the activated carbon surface of the nut shell is continuously strengthened, and the resulting groove structure changes accordingly.