乙二醇与水对Bi2O2CO3结构及其脱Hg性能的影响

采用水热法制备Bi₂O₂CO₃纳米光催化剂，研究了乙二醇和水的体积比对Bi₂O₂CO₃制备的影响，采用XRD（X射线衍射）、SEM（扫描电子显微镜）、BET比表面积等表征手段对Bi₂O₂CO₃性能及其结构进行表征，并对Bi₂O₂CO₃在紫外光条件下光催化脱除气体中单质Hg的性能进行了研究.结果表明:当乙二醇和水共同作用时有助于Bi₂O₂CO₃孔径的增大，当V（乙二醇）:V（水）为2:1时，孔径达到最大，为33 nm；脱Hg效率与Bi₂O₂CO₃孔径的大小呈正相关，线性直线斜率（k）为1.64.当孔径达到最大值33 nm时，紫外光条件下的Bi₂O₂CO₃纳米光催化剂光催化脱Hg效率也达到最大值（81%）.研究显示，Bi₂O₂CO₃纳米光催化剂孔径的增大会延长单质Hg在光催化剂表面的停留时间，有利于光催化反应的进行. 

Impacts of Glycol and Water on Bi2O2CO3 Structure and Its Performance on Photocatalytic Removal of Mercury

Bi₂O₂CO₃ nano catalysts were prepared by hydrothermal method, and the effects of ethylene glycol and water on preparation of Bi₂O₂CO₃ were studied by an experiment changing the volume ratio of ethylene glycol to water.XRD, SEM and BET were employed to characterize the properties and structure of the as-prepared samples.At the same time, the mercury removal performance under UV light was experimentally studied.The results showed that it is beneficial for the growth of the pore size of Bi₂O₂CO₃ when ethylene glycol and water acted as common solvent.When the volume ratio of ethylene glycol and water was 2:1, pore diameter reached the maximum, i.e., 33 nm.Furthermore, the mercury photocatalytic oxidation efficiency was positively correlated with the pore diameter.After linear fitting, the slope of the line(k) was 1.64.With the increase of pore diameter, photocatalytic oxidation mercury efficiency increased.When pore diameter reached the maximum(i.e., 32 nm), the mercury photocatalytic oxidation efficiency also reached the maximum, 81%.Studies have shown that the larger pore size will prolong the residence of Hg on the surface of Bi₂O₂CO₃, which is beneficial for photocatalytic removal of element mercury reaction.