Abstract
Hierarchically porous structures play crucial roles on the biological and artificial materials, hence, the development of readily method to prepare microparticles with hierarchical pores and tunable morphologies is of great significance. Here, a facile electrospray technique combining breath figure (BF) or nonsolvent induced phase separation (NIPS) was developed to prepare hierarchically porous microparticles with various morphologies based on polymers of intrinsic microporosity (PIM-1). The relationship between the ternary system composition of the electrospraying (PIM-1 and cosolvent) and the microparticle architectures (morphology and pore structure) was carefully investigated. The as-prepared PIM-1 microparticles possess predominant micropores and abundant macropores with high surface areas in range from 548 m2 g−1 to 747 m2 g−1. Their adsorption capacities for CO2 and organic dye were facilitated by the generation of macropores, owing to the increased accessibility of isolated micro-mesopores. More importantly, they perform enhanced selective adsorption abilities towards malachite green (MG) for the methyl orange/MG mixture pairs.
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