Effects of Deca-Brominated Diphenyl Ethers (BDE209) on Adsorption and Release of Metal Ions by Bacillus Cereus
十溴联苯醚(BDE209)对蜡状芽胞杆菌吸附/释放金属离子的影响

In view of joint contamination of heavy metals and polybrominated diphenyl ethers (PBDEs), combined Bacillus cereus was selected as the adsorbent to research on the effects of BDE209 on adsorption and release of metal ions by Bacillus cereus. Combined Bacillus cereus showed prompt, efficient and stable adsorption character for low concentration of Pb(II) (0.712mg·L-1) and Zn(II) (4.844mg·L-1), with highest adsorption rates of 98.31% and 97.83%, respectively. While for Cu(II) (1.915mg·L-1) the highest adsorption rate was 59.90%. Obvious release of other metal ions, such as Ca(II), K(I), and Na(I), was accompanied with biosorption, and total release quantity was found to be more than total quantity of adsorption. As BDE209 is concerned, the influence of its concentration on adsorption rate was observed. Adsorption capacity was stimulated with existence of 1mg·L-1 BDE209. However, biosorption of Pb(II) and Zn(II) started to decrease 4 hours after 10mg·L-1 BDE209 was added into the system while stimulative effects for Cu(II) were observed all the time. And the delay of K(I) and Na(I) release was found in the period of 1h to 4h at high concentration of BDE209.