Co修饰CeO<sub>2</sub>复合材料的晶面调控及其光热催化脱硝性能

马恬; 朱晨; 刘成宝; 余辰辰; 张文雅; 钱君超; 陈志刚

doi:10.13801/j.cnki.fhclxb.20200323.001

Co修饰CeO₂复合材料的晶面调控及其光热催化脱硝性能

doi: 10.13801/j.cnki.fhclxb.20200323.001

苏州科技大学　化学生物与材料工程学院　江苏省环境功能材料重点实验室，苏州 215009

基金项目: 江苏省自然科学基金(BK20180103; BK20180971)；江苏省高校自然科学基金(16KJA430008)；江苏省高校优势学科建设工程资助项目；江苏高校水处理技术与材料协同创新中心；苏州市科技发展计划项目(重点产业技术创新—前瞻性应用研究)(SYG201742; SYG201818)；苏州市微纳光电材料与传感器重点实验室(SZS201812)

详细信息

通讯作者:
刘成宝，博士，副教授，研究方向为光催化材料的结构设计及其在能源和环境领域的应用　E-mail：Lcb@mail.usts.edu.cn

#为共同第一作者
中图分类号: TQ426.6
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出版历程
- 收稿日期: 2019-10-16
- 录用日期: 2020-03-12
- 网络出版日期: 2020-03-23
- 刊出日期: 2020-09-15

Facet control of Co-modified CeO₂ composite and its thermal-photocatalytic denitration property

Jiangsu Key Laboratory for Environment Functional Materials, School of Chemistry, Biology and Materials Engineering, Suzhou University of Science and Technology, Suzhou 215009, China

摘要

摘要: 采用一步水热法，通过调节Co与Ce的摩尔比，制备出暴露高活性晶面的Co修饰CeO₂复合材料。利用比表面和孔径分析仪、TG-DSC、TEM、SEM、XRD、紫外-可见分光光度计(UV-vis)、XPS、光热催化脱硝技术对Co修饰CeO₂复合材料进行全面表征。结果表明，随着Co元素含量的增加，Co修饰CeO₂复合材料的比表面积增大，CeO₂呈纳米棒状结构，Co与表面氧生成Co₃O₄，二者的共结晶过程降低了复合材料的结晶表面能，使CeO₂主要暴露(200)和(220)高活性晶面，且暴露比例增大。光热催化脱硝结果表明，当Co与Ce摩尔比为15%、煅烧温度为400℃时，Co修饰CeO₂复合材料的光热催化效率达到最高，为98%。
- Co /
- CeO₂ /
- 催化材料 /
- 晶面调控 /
- 光催化脱硝
Abstract: The Co-modified CeO₂ composites with high active crystal planes were synthesized by simple one step hydrothermal method. The structure of Co-modified CeO₂ composites was characterized by specific surface area and porosity analyzer, TG-DSC, TEM, SEM, XRD, ultraviolet-visible spectrophotometer (UV-vis), XPS and photothermal catalytic denitration. The results show that as the amount of Co increases, the specific surface area of the Co-modified CeO₂ composites increases. The exposed high active surface is (200) and (220) crystal face, while the Co-modified CeO₂ composites mainly show rod-like structure; when the concentration of Co content precursor increases, CeO₂ has a nanorod structure, and the Co produces in the form of Co₃O₄ by chemical band connection with surface oxygen. The results of thermal-photocatalytic denitration test show that the catalytic efficiency of the Co-modified CeO₂ composites reaches 98% with 15% molar ratio of Co to Ce at 400℃ calcination temperature.
- Co /
- CeO₂ /
- catalytic material /
- facet control /
- thermal-photocatalytic denitrification
注释:

1) #为共同第一作者

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图 1 光热催化脱硝性能测试装置

Figure 1. Test apparatus for thermal-photocatalytic denitration property

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图 2 Co修饰CeO₂复合材料的TG-DSC曲线

Figure 2. TG-DSC curves of Co-modified CeO₂ composites

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图 3 不同Co与Ce摩尔比的Co修饰CeO₂复合材料的XRD图谱

Figure 3. XRD patterns of Co-modified CeO₂ composites with different molar ratios of Co to Ce

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图 4 不同Co与Ce摩尔比的Co修饰CeO₂复合材料的SEM图像

Figure 4. SEM images of Co-modified CeO₂ composites with different molar ratios of Co to Ce

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图 5 Co与Ce摩尔比为15%的Co修饰CeO₂复合材料的TEM图像

Figure 5. TEM images of Co-modified CeO₂ composites with 15% molar ratio of Co to Ce

d—Interplanar spacing

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图 6 Co与Ce摩尔比为15%的Co修饰CeO₂复合材料的N₂吸附-脱附曲线

Figure 6. N₂ adsorption-desorption curves of Co-modified CeO₂ composites with 15% molar ratio of Co to Ce

S_BET—Surface area

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图 7 Co与Ce摩尔比为15%的Co修饰CeO₂复合材料的XPS图谱

Figure 7. XPS spectra of Co-modified CeO₂ composites with 15% molar ratio of Co to Ce

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图 8 不同Co与Ce摩尔比的Co修饰CeO₂复合材料的紫外-可见光谱和(αhν)²-hν曲线

Figure 8. UV-vis spectra and (αhν)²-hν curves of Co-modified CeO₂ composites with different molar ratios of Co to Ce

α—Absorption coefficiency; hν—Photon energy

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图 9 不同Co与Ce摩尔比的Co修饰CeO₂复合材料的NO光热催化曲线

Figure 9. NO catalytic curves of Co-modified CeO₂ composites with different molar ratios of Co to Ce

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