• 关键词：介电泳  微电极阵列  空心微球  Pb²⁺

• 基金项目：国家民委项目(No.07ZY13);中央民族大学“985”项目资金(No.cun985-3-3)

• 陈慧英
• 中央民族大学生命与环境科学学院, 北京 100081

• 张鹤腾
• 中央民族大学生命与环境科学学院, 北京 100081

• 于乐
• 中央民族大学生命与环境科学学院, 北京 100081

• 摘要：利用空心微球吸附水中的重金属Pb²⁺,将悬浮液注入装有微电极阵列芯片的微介电泳池中,施加交流电压,用介电泳捕获悬浮液中的空心微球.同时,研究了空心微球吸附铅离子前后的介电迁移规律.结果表明,吸附了Pb²⁺的空心微球发生了正介电泳现象.此方法可以将吸附了重金属离子的空心微球捕集到一定的区域中,为工业废水中重金属离子的治理提出一种可能的方法.

• Abstract：After absorbing Pb²⁺,hollow microspheres exhibit positive dielectrophoresis (pDEP) in a non-uniform electric field. The pDEPis beneficial to capture the micro-particles onto the electrodes,which provides a possible method to remove heavy metals from water using DEPand microspheres. Lead ions such as Pb²⁺ in the water are first adsorbed by the microspheres,and the suspension is then injected to a chamber equipped with a microchip of microelectrode arrays. The hollow microspheres are trapped by dielectrophoresis force after voltage is applied. The DEPresponses of the microspheres were investigated before and after absorbing Pb²⁺. The results show that pDEPhappens after microspheres absorb Pb²⁺. We can trap microspheres with Pb²⁺ in certain regions of the non-uniform field. This method is a possible way to remove heavy metals from the industrial waste water without secondary pollution.

• Key words：dielectrophoresis  microelectrode arrays  hollow microspheres  Pb(II)

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