纳米TiO_2用于Hg(Ⅱ)和苯基汞的富集分离

Concentration and Separation of Hg(Ⅱ) and Phenyl-mercury over the Nano-TiO_2

以纳米TiO2富集分离-冷原子吸收法测定水环境中的Hg(Ⅱ)、苯基汞,考察了两种形态汞在纳米TiO2上的富集、分离行为。试验结果表明:pH值对纳米TiO2吸附Hg(Ⅱ)、苯基汞影响显著,最佳pH值分别为9.0、10;纳米TiO2对Hg(Ⅱ)、苯基汞的吸附速度快,最佳吸附时间均为12min;φ(HCl)=15%时,对Hg(Ⅱ)和苯基汞的洗脱率达90%以上。

Based on the combination of concentration/separation using nano-TiO2 and determination by CVAAS（cool vapor atomic adsorption spectrometry）,the adsorption and separation behavior of Hg（Ⅱ） and phenyl-mercury on nano-TiO2 were investigated.The experimental results were： effects of pH on adsorption of Hg（Ⅱ） and phenyl-mercury over the nano-TiO2 were remarkable;excellent adsorption ratio could be obtained when the pH exceed 9.0 for Hg（Ⅱ） and 10.0 for phenyl mercury respectively;the optimum surging time were both 12 minutes;15%（V/V）HCl solution could elute both Hg（Ⅱ） and phenyl-mercury above 90%.