I synthesized rGO/ZnO nanocomposites in different ratios.The results showed an increse in adsorption capacity of adsorbent as rGO ratio increase.How rGO enhance adsorptive activity of adsorbents?
The driving force of adsorption is decrease of the adsorbent surface Gibbs energy. The larger the specific surface area (sm2/g) of the adsorbent, the better it adsorbs other substances. Adsorption is dependent on the structure of matter and the structure of the adsorbent. When the specific surface area of GO and ZnO equal, graphene oxide will be better adsorb benzene and zinc oxide will better absorb alcohol.
You do not write what you substance is adsorbed. Apparently, you GO / ZnO is less of the specific surface area (increased volume of nanoparticles). At GO it more. GO smaller particles.
Best regards.
GO / rGO is not always smaller. The bigger the initial graphite particles (if the defects are not many), the bigger are GO / rGO sheets. It can go to hundreds of microns and even mm as planar size. If the ZnO particles were not wrapped by the sheets, being only attached to them (which is most likely the case), the specific surface will increase (rGO sheets would be not able to aggregate to each other).
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