模拟废水中钯的微生物回收及其对亚甲基蓝的催化特性

发布时间：2018-05-08 03:11

  本文选题：钯 + 二次回收　； 参考：《环境科学》2017年08期

【摘要】：以粪肠球菌(Enterococcus faecalis)Z5菌株(CCTCC M2012445)为菌种资源,探讨了其在外源电子供体条件下以纳米颗粒形式回收溶液中钯的可能性,研究了工业废液(IW)、废旧电路板(PCBS)和废汽车催化剂(SAC)3种模拟废水中钯的回收率,分析了废水中其它离子对钯回收率的影响.结果表明,粪肠球菌Z5菌株可以从3种模拟废水中回收钯纳米颗粒.X射线衍射和透射电镜分析表明,回收产物为10 nm左右粒径的钯纳米颗粒,主要分布于细胞周质.3种废水中钯的回收率依次为IWSACPCBS,其中吸附率依次为99.8%(6 h)、99.7%(8 h)、90.3%(12 h),还原率依次为99.9%(4 h)、99.9%(6 h)、80.4%(36 h).模拟废水中Pt(Ⅳ)、Ag(Ⅰ)、Cu(Ⅱ)、Au(Ⅲ)和Fe(Ⅱ)对钯的还原和吸附过程都存在影响.具体地,钯的还原效率受影响程度依次为Au(Ⅲ)Pt(Ⅳ)Cu(Ⅱ)Ag(Ⅰ)Fe(Ⅱ).进一步将回收所得的纳米钯掺杂四氧化三铁,可应用于非均相芬顿反应中染料亚甲基蓝降解,80 min内亚甲基蓝的降解率为96.7%,显示出良好的催化性能.
[Abstract]:Using Enterococcus faecalis faecalis)Z5 strain (CCTCC M2012445) as the strain resource, the possibility of recovering palladium from solution in the form of nanoparticles under the condition of external electron donor was discussed. The recovery rate of palladium in industrial waste liquid (IW), waste circuit board (PCBS) and waste automobile catalyst (SACX) was studied. The effect of other ions in waste water on the recovery of palladium was analyzed. The results showed that Enterococcus faecalis strain Z5 could recover palladium nanoparticles from three kinds of simulated wastewater. X-ray diffraction and transmission electron microscopy analysis showed that the recovery product was about 10 nm diameter palladium nanoparticles. The recovery rate of palladium mainly distributed in pericellular waste water was IWSACPCBSs, in which the adsorption rate was 99.8 h and 99.772 h respectively. The recovery rate was 90.3 h and the reduction rate was 99.9 h ~ 99.9% ~ 99.9% ~ 99.9 h ~ (99. 9) h ~ (-1) = 80.436 h ~ (-1), respectively. In simulated wastewater, the effects of Pt (鈪，

本文编号：1859697