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One novel method of preparing macro-porous silica microspheres on a large scale is presented here, which utilized spray drying silica/polymer composite particles and calcination.

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Eggshell membrane (ESM) is selected as biotemplate to prepare MnO 2 submicroparticles (SMPs) using Chinese Brush with sodium hydroxide solution. The size with average 710 nm of the obtained materials is in good consistency with the microsructured biotemplate. An efficient and convenient absorbent for methylene blue (MB) is developed. The removal efficiency could reach up to 93% in 35 min under room temperature without pH adjusting owing to the excellent adsorption from ESM itself and hydroxyl group formed on the surface of MnO 2 crystal in the aqueous solution. Materials on the membrane can be separated from the wastewater simply to avoid the secondary pollution caused by the leak of material. This interesting approach to MnO 2 SMPs and facile operation for MB adsorption could open a new path to the submicro-materials based wastewater treatment.