微/纳米ZnO绒球的制备及其在自然光下催化降解有机染料性能
以谷氨酸氟硼酸(GluBF4)离子液体水溶液为反应介质,以物质的量比为1:6的二水合醋酸锌[Zn(Ac)2·2H2O]和氢氧化钠为原料,室温下制备前驱体,再微波辅助加热制备了纳米氧化锌粉体,获得了纳米结构微米尺寸纳米Zn O绒球.利用场发射扫描电镜(FESEM)、X射线衍射(XRD)、比表面(BET)、能量色散谱(EDS)等对产物进行了表征.所得产物为六方晶系纤锌矿结构,粉体粒径20.4 nm,绒球比表面积为28.3 m^2·g^-1,产物纯度较高,收率95.3%.同时探讨了纳米ZnO绒球生成的可能机理.该纳米材料在日光下显示较高的光催化活性和稳定性.分别配制浓度为10 mg·L^-1的100...
Saved in:
Published in | 物理化学学报 Vol. 31; no. 8; pp. 1615 - 1620 |
---|---|
Main Author | |
Format | Journal Article |
Language | Chinese |
Published |
北京石油化工学院化学工程学院,北京,102617
2015
|
Subjects | |
Online Access | Get full text |
ISSN | 1000-6818 |
DOI | 10.3866/PKU.WHXB201505141 |
Cover
Summary: | 以谷氨酸氟硼酸(GluBF4)离子液体水溶液为反应介质,以物质的量比为1:6的二水合醋酸锌[Zn(Ac)2·2H2O]和氢氧化钠为原料,室温下制备前驱体,再微波辅助加热制备了纳米氧化锌粉体,获得了纳米结构微米尺寸纳米Zn O绒球.利用场发射扫描电镜(FESEM)、X射线衍射(XRD)、比表面(BET)、能量色散谱(EDS)等对产物进行了表征.所得产物为六方晶系纤锌矿结构,粉体粒径20.4 nm,绒球比表面积为28.3 m^2·g^-1,产物纯度较高,收率95.3%.同时探讨了纳米ZnO绒球生成的可能机理.该纳米材料在日光下显示较高的光催化活性和稳定性.分别配制浓度为10 mg·L^-1的100 mL甲基橙(MO)和甲基紫(MV)水溶液,30 mg纳米氧化锌为光催化降解催化剂,太阳光激发下5 h脱色率分别达到74.3%和96.9%;溶液总有机碳(TOC)含量随光降解的进行缓慢下降;光催化剂重复利用5次,催化剂形貌不变、颜色不变,质量基本未发生变化. |
---|---|
Bibliography: | 11-1892/O6 A novel, high-yielding synthesis of micro/nano ZnO pompons using glutamic acid fluoborate(Glu BF4) ionic liquid is reported. The precursor was prepared with zinc acetatedihydrate [Zn(Ac)2· 2H2O]and sodium hydroxide(molar ratio = 1:6) as starting materials in an aqueous solution of the Glu BF4 ionic liquid at room temperature, which was then heated by microwave to form nano-Zn O powder. The ZnO pompons were characterized using field emission scanning electron microscopy(FESEM), X-ray diffraction(XRD), specific Brunauer-Emmett-Teller(BET) surface area method, and energy dispersive spectrometry(EDS). The product displayed a hexagonal wurtzite structure. The pompon diameter was determined to be20.4 nm, with a pompon specific surface area of 28.3 m^2·g^-1. A possible mechanism for the formation of the nano-Zn O pompons is discussed. The Zn O pompons displayed high photocatalytic reactivity and photostability under sunlight. Aqueous solutions of methyl orange(MO) and methyl violet(MV) containing the Zn O |
ISSN: | 1000-6818 |
DOI: | 10.3866/PKU.WHXB201505141 |