Methyl blue (MB) is one of the most common dyes which is widely used as the coloring agent and disinfector in pesticides, pharmaceuticals, dyestuffs and varnishes14-16, and it is generally adopted as a representative organic pollutant to test the adsorption performance for the removal of organic contaminants from wastewater. However, up to date, the maximum adsorption capacity of all the reported MB adsorbents is still below 104 mgg-1 (Supplementary Information SI).