A facile method for preparation of floatable and permeable fly ash-based geopolymer block

摘要

We present a process of fabricating water floatable and permeable geopolymer block from industrial by-product fly ash. By adding oleic acid and H2O2 solution during the geopolymer manufacture process, a foamed geopolymer block with highly interconnected pores can be manufactured. The compressive strength of those foamed geopolymer block are 0.55 +/- 0.08 MPa at dry density of 0.37 g/cm(3), and its permeability to water coefficient is 0.35 cm/s and the BET surface area is 67.62 m(2)/g. In addition, the porous geopolymer block possesses a high adsorption capacity for methylene blue, 50.7 +/- 0.7 mg/g, and shows the potential of being employed as low cost replacement for zeolites in applications such as waste water treatment at high mass transport rate.