不同纵横比ZnO纳米锥的可控合成及其光催化性能

doi:10.11901/1005.3093.2016.655

材料研究学报

2017, Vol. 31

Issue (8): 619-626 DOI: 10.11901/1005.3093.2016.655

研究论文

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不同纵横比ZnO纳米锥的可控合成及其光催化性能

陈燕(

), 张萍, 尚永辉, 王晓玲

咸阳师范学院化学与化工学院咸阳 712000

Controllable Synthesis and Photocatalytic Activity of ZnO Nano-cones with Different Aspect Ratio

Yan CHEN(

), Ping ZHANG, Yonghui SHANG, Xiaoling WANG

Chemistry and Chemical Engineering School, Xianyang Normal University, Xianyang 712000, China

引用本文:

陈燕, 张萍, 尚永辉, 王晓玲. 不同纵横比ZnO纳米锥的可控合成及其光催化性能[J]. 材料研究学报, 2017, 31(8): 619-626.
Yan CHEN, Ping ZHANG, Yonghui SHANG, Xiaoling WANG. Controllable Synthesis and Photocatalytic Activity of ZnO Nano-cones with Different Aspect Ratio[J]. Chinese Journal of Materials Research, 2017, 31(8): 619-626.

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摘要:

在醋酸锌-正丁胺-四氢呋喃/乙醇溶剂热体系中改变正丁胺用量和反应温度,实现了不同纵横比ZnO纳米锥的可控合成,使用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、透射电子显微镜(TEM)及紫外-可见漫反射光谱(UV-Vis DRS)等手段对其形貌和结构进行表征,提出了ZnO纳米锥的生长机理。以甲基橙(MO)为目标降解物,研究了ZnO纳米锥的光催化活性。结果表明：与商业ZnO粉末相比,纳米锥表现出较高的反应活性。纵横比小的ZnO纳米锥具有的高催化活性,因为其结构中活性{001}晶面所占的比例较大。

关键词 ：纳米材料, ZnO纳米锥, 可控合成, 形成机理, 光催化, 活性晶面

Abstract：

ZnO nano-cones with various aspect ratios were synthesized via a solvothermal reaction of zinc acetate with n-butylamine and tetrahydrofuran or ethanol by varying dosage of n-butylamine and temperature. The possible growth mechanism was proposed. The products were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS). Photocatalytic activity of ZnO nano-cones in degradation of methyl orange (MO) was investigated, and the results show that ZnO nano-cones show superior photoreactivity, compared to ZnO powders as a benchmarking. The superior intrinsic photocatalytic activity can be attributed to the high percentage of exposed {001} facets of ZnO nano-cones with small aspect ratio.

Key words： nano-materials ZnO nano-cones controlled synthesis formation mechanism photocatalytic activity reactive facets

收稿日期: 2016-11-08

ZTFLH:

O649

基金资助:国家自然科学基金(21305117和21475113),陕西省自然科学基金(2012JQ2014和2017JQ2043),咸阳师范学院化学与化工学院科技成果转化项目(XSYHGKZ1701)

作者简介:

作者简介陈燕,女,1979年生,博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.655 或 https://www.cjmr.org/CN/Y2017/V31/I8/619

表1 制备不同纵横比ZnO纳米锥的反应条件、TC002、BET、K和k'值

图1 (a)样品1、(b)样品2和(c)样品3的SEM图

图2 样品1(I)、2(II)和3(III)的XRD谱,图中的条形图案是ZnO的XRD粉末衍射标准图谱 (JPCDS No.36-1451)

图3 样品2的(a)TEM、(b)SAED和(c)HRTEM照片

图4 VBA:VTHF =0.5:10,140℃反应不同时间制备样品的SEM照片(a) 1 h、(b) 5 h和(c) 7 h

图5 VBA:VTHF =0.5:10、在140℃反应不同时间的样品的XRD谱(a) 1 h,(b) 5 h,(c) 7 h图中条形图案是ZnO的XRD粉末衍射标准图谱 (JPCDS No.36-1451)

图6 ZnO纳米锥的形成过程示意图

图7 样品1、2、3和4的(a)UV-vis漫反射光谱和(b)带隙谱

图8 (a)样品1、2、3和4对MO染料的吸附动力学曲线;(b)含不同催化剂的MO溶液在汞灯照射下的光降解效果;(c)含有不同催化剂的MO溶液经Hg灯照射不同时间的ln(C0/C)对时间t的关系;(d)以及样品1、2、3和4光催化降解MO反应的归一化反应速率常数的比较

图9 样品1、2和3在汞灯照射下循环降解MO溶液

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