Research On The Removal Of PBDEs In Water By Fe0

Polybrominated diphenyl ethers (PBDEs) have been widely used as flame retardants in numerous consumer products such as electrical apparatus, electronic product, expanded plastics and decoration materials. With the increasing of PBDEs in the environment, the research of removal technology of PBDEs has become increasingly important. In this study, the Removal of PBDEs by Fe0 (including the bimetal based on Fe0) was stressed with the hope of providing some meaningful advices for the real engineering application.Our study found that, Fe0 can make PBDEs in water debrominated under laboratory conditions, and by changing the conditions of pH, temperature, particle size of Fe0 and the number Fe0, wen can enhance the reductive debromination capability of Fe0. The experimental results show that, acidic conditions are conducive to the PBDEs debromination, the debromination rate decreases with increasing of the pH. The smaller Fe0 particle size and the higher temperature is in favor of PBDEs debromination. the increasing of the initial dosage of Fe0 can result in the increasing of debromination rate. The study show that, after 14 days, the highest debromination of PBDEs is only 30%, the debromination is non-optimal.In order to improve the debromination rate of the PBDEs, we attempted to replace the Fe0 with the Fe-Ni, Fe-Pd, Fe-Cu, Fe-Zn bimetallic particles to reduce the PBDEs. The experimental results show that, compared with the Fe0, the bimetallic particles have a higher debromination rate of PBDEs, in particular, the Fe-Ni and Fe-Pd bimetallic particles can make the 5 day debromination rate of PBDEs raise four times and one times respectively. We analyzed the surface features and the composition of the bimetallic particles, the result show that, the surface of the Fe0 was covered by the other metal, which changed its surface structure and improved its adsorption and reducing capacity.