RESUMO
The removal of the pollutants from the environment is the need of the environmental protection. ZIF-8 is promising adsorbents, and the construction of ZIF-8 assembly is essential to boost its performance. Here, we showed the easy synthesis of two-dimensional (2D) assembly built by ZIF-8 particles (2D A-ZIF-8) for the high-efficient capture of the iodine (I2) and dyes. The assembly was synthesized by the controllable reaction of 2-methylimidazole (2-MIM) with 2D Zn-glycerol (Zn-GL) precursor. Time-dependent experiments showed the predominant replacement of GL at outer boundary and then basic plane of the precursor by 2-MIM. The assembly can be synthesized with high output and combined the advantage of large accessible surface of 2D sheets, the plentiful pores of ZIF-8 and enhanced stability of assembly, endowing the large potential as adsorbent. The high adsorption capacity of I2 (200 wt%) was achieved on A-ZIF-8, while it is about 128 wt% on traditional dodecahedronal ZIF-8. The assembly also showed the excellent adsorption capacity for methyl orange (MO) (46.3 mg g-1) and methylene blue (MB) (46.5 mg g-1) at a concentration of 50 mg L-1. It can be easily separated for reuse benefited from the large size and enhanced stability of assembly.
RESUMO
An effective "precursor-transformation" route was developed for the high-yield synthesis of ZIF-8 tubes based on the reaction of 1D Zn-EG (ethylene glycol) wires with 2-methylimidazole (with around 0.6 g of ZIF-8/60 mL of solvent, the yield is over 90% based on Zn). The ZIF-8 tubes fixed on a sponge can be used as an effective material for oil/water separation.