物理化学学报Issue(2)：543-550,8.DOI:10.3866/PKU.WHXB201511194
酸碱度调控氧化锌纳米材料形貌及其光催化还原CO2研究
Controllable Modulation of Morphology and Photocatalytic Performance of ZnO Nanomaterials via pH Adjustment
摘要
Abstract
ZnO microstructures and nanostructures with control ed-morphology were synthesized by the hydrothermal method. Al samples were prepared using precursors at different pH values and then annealed at 500 ° C for 2 h. The samples were characterized by X-ray diffraction (XRD) patterns, scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible spectroscopy (UV-Vis), and BET specific surface area measurement. Al samples were confirmed by XRD to be wurtzite ZnO. As the pH value of the precursor increased, sheet-like ZnO disappeared and rod-like ZnO was produced. The major surfaces of sheet-like and rod-like ZnO were polar and nonpolar crystal faces, respectively. At pH 6.5, Cl-was adsorbed onto the (002) polar face and inhibited the growth along the polar crystal face ({Zn2+}crystal surface). A microporous sheet ZnO was formed by annealing the obtained sheet-like Zn5(OH)8Cl2∙H2O. When OH-was added into the precursor, Zn(OH)42-was generated via coordination with Zn2+, which was adsorbed onto the (002) polar face and promoted growth along the polar crystal face. Rod-like ZnO was thus produced. The obtained ZnO could photocatalytical y reduce CO2 under il umination. Sheet-like ZnO exhibited better photocatalytic performance than rod-like ZnO. This may be because the polar crystal face shows better photocatalytic activity than the unpolar crystal face.关键词
ZnO/pH值/水热法/形貌/光催化CO2Key words
ZnO/pH value/Hydrothermal process/Morphology/Photoreduction of CO2分类
化学化工引用本文复制引用
胡海峰,贺涛..酸碱度调控氧化锌纳米材料形貌及其光催化还原CO2研究[J].物理化学学报,2016,(2):543-550,8.基金项目
The project was supported by the International Cooperation Department of Ministry of Science and Technology of China (2015DFG62610).国家科技部国际合作司(2015DFG62610)资助项目 （2015DFG62610）
