Abstract：With suspension polymerized chloromethylated polystyrene microspheres as carrier, NZVI—PS was prepared by the sodium borohydride reduction method in liquid phase. The prepared NZVI—PS was characterized by SEM, EDS and BET and used to degrade the high toxic and hard-degraded substance of nitrobenzene (NB). The experiments were conducted to discuss the effects of microsphere dosage, solution temperature and pH on the degradation of different initial concentration nitrobenzene. The adsorber-reduction dynamics mechanism of NZVI—PS to nitrobenzene and the reuse performance of microspheres were also discussed. The results show that the nanoscale zero-valent iron in NZVI—PS has good dispersion performance with large specific surface area, and the agglomeration is not obvious. After being used repeatedly for four times, the using value of the carrier microspheres is still very high. The nitrobenzene degradation rate can reach 99.8％ under the optimal conditions, and the adsorber-reduction reaction rate is in line with the first order reaction.
2017, Vol. 38 
