Comment on "Hierarchically porous, ultra-strong reduced graphene oxide-cellulose nanocrystal sponges for exceptional adsorption of water contaminants" by N. Yousefi, K. K. W. Wong, Z. Hosseinidoust, H. O. Sørensen, S. Bruns, Y. Zheng and N. Tufenkji, Nanoscale, 2018, 10, 7171.

The MB-spot test is extensively applied to specific surface area measurement due to its simplicity compared to the classical BET test. However, the MB-spot test is vulnerable to multiple factors, preventing this newly-prevalent technique from accurately characterising the specific surface area. The inaccuracy of the MB-spot test is discussed here at length, which is urgently needed to avoid mistakes and inconsistencies regarding specific surface area characterization for carbon-based materials.