以枫叶为模板合成分级多孔氧化铈材料及其催化性能

doi:10.3724/SP.J.1077.2012.00069

无机材料学报 ›› 2012, Vol. 27 ›› Issue (1): 69-73.DOI: 10.3724/SP.J.1077.2012.00069

以枫叶为模板合成分级多孔氧化铈材料及其催化性能

陈丰^1,2, 陈志刚^1,2,3,4, 钱君超^1,2, 刘成宝^2,3,4, 王炜^1,2

(1. 江苏大学材料科学与工程学院, 镇江 212013; 2. 山东大学晶体材料国家重点实验室, 济南 250100; 3. 苏州科技学院江苏省环境功能材料重点实验室, 苏州 215011; 4. 苏州科技学院化学与生物工程学院, 苏州 215011)

收稿日期:2011-03-31 修回日期:2011-05-11 出版日期:2012-01-09 网络出版日期:2011-12-19
作者简介:陈丰(1981-), 男, 博士研究生. E-mail: ujschenfeng@163.com
基金资助:
国家自然科学基金 (20771047, 21071107);江苏省油气储运重点实验室项目基金(CY0901);江苏省研究生科研创新计划(CX10B-256Z);苏州市环境功能材料重点实验室(SZS201008);苏州市工业支撑项目(SYG201029)

Hierarchical Porous Ceria Synthesized by Maple Leaf Templates and Its Catalytic Performance

CHEN Feng^1,2, CHEN Zhi-Gang^1,2,3,4, QIAN Jun-Chao^1,2, LIU Cheng-Bao^2,3,4, WANG Wei^1,2

(1. Department of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China; 2. State Key laboratory of Crystal Material, Shandong University, Jinan 250100, China; 3. Jiangsu Key Laboratory for Environment Functional Materials, Suzhou University of Science and Technology, Suzhou 215011, China; 4. School of Chemistry and Biochemistry, Suzhou Univerisity of Science and Technology, Suzhou 215011, China)

Received:2011-03-31 Revised:2011-05-11 Published:2012-01-09 Online:2011-12-19
Supported by:
National Natural Science Foundation of China (NSFC20771047, NSFC21071107);Key Laboratory for Oil-gas Storage and Transportation Engineering of Jiangsu Province (CY0901);Creative Project of Postgraduate of Jiangsu Province (CX10B-256Z);Key Laboratory for Environmental Function Materials of Suzhou (SZS201008);Industrial Surport Project of Suzhou (SYG201029)

摘要/Abstract

摘要：

以枫叶为生物模板合成了由纳米颗粒构成的分级多孔氧化铈材料. 采用场发射电子显微镜(FESEM)、透射电子显微镜(TEM)和氮气脱吸附技术表征了材料的独特生物形态微结构, 其仿生结构是由复制气孔得到的微米孔和复制细胞孔得到的2~4 nm的小孔构成. 通过广角X射线衍射(XRD)、高分辨透射电子显微镜(HRTEM)和BET计算发现多孔氧化铈具有很小的晶粒(6~8 nm)和较大的比表面积(64.4 m²/g). 利用化学储氧量(OSC)评价了样品催化性能, 结果表明: 分级多孔氧化铈比无孔氧化铈含有更多的表面活性氧. 当将材料用于酸性品红脱色反应, 由于分级多孔氧化铈材料的颗粒小, 比表面积大和化学储氧量高, 其在染料废水净化处理时具有较好的催化活性和吸附能力, 到300 min时脱色率可达到100%.

关键词: 氧化铈, 分级多孔, 生物模板, 催化活性

Abstract:

Hierarchical porous ceria with nanocrystalline was successfully synthesized using maple leaf as a biotemplate. Unique biomorphic microstructures were characterized by Field Emission Scanning Electron Microscope (FESEM), transmission electron microscope (TEM) and nitrogen absorption-desorption technique. The obtained ceria material shows the repetitious biomimetic structure consisting of the stoma porous about several μm and nanopores with 2-4 nm apertures. The small crystal grain (6-8 nm) and the high specific surface area (64.4 m²/g) of porous CeO₂ are detected by wide-angle X-ray diffraction (XRD), high resolution TEM (HRTEM) and the BET method. The catalytic property is evaluated by the oxygen storage/release capacity (OSC). The test confirms that hierarchical porous material possesses more surface active oxygen than nonporous ceria does. While the concentration of acid fuchsine is 40 mg/L, the porous sample has a higher decoloring rate in a shorter time than others. The decoloring rate can reach 100% after decolored for 300 min. The investigation infers that the hierarchical porous ceria exhibits better catalytic activity and higher adsorptive capacity in dye wastewater purification due to smaller crystallite size, higher surface area and enhanced OSC.

Key words: ceria, hierarchical porous, biotemplate, catalytic activity

中图分类号:

O611
TB321

陈丰, 陈志刚, 钱君超, 刘成宝, 王炜. 以枫叶为模板合成分级多孔氧化铈材料及其催化性能[J]. 无机材料学报, 2012, 27(1): 69-73.

CHEN Feng, CHEN Zhi-Gang, QIAN Jun-Chao, LIU Cheng-Bao, WANG Wei. Hierarchical Porous Ceria Synthesized by Maple Leaf Templates and Its Catalytic Performance[J]. Journal of Inorganic Materials, 2012, 27(1): 69-73.

图/表 5

图1 仿生形貌分级多孔氧化铈材料的FESEM(a、b)、TEM(c)和HRTEM(d, 插图为SAED分析)照片

Fig. 1 FESEM images (a, b), TEM image (c) and HRTEM image (d, inset image: SAED pattern) of biomimetic structural hierarchical porous ceria

图2 分级多孔CeO2(a)和无孔氧化铈(b)的XRD图谱

Fig. 2 XRD patterns of hierarchical porous CeO2 (a) and nonporous CeO2 (b)

图3 分级多孔CeO2的N2气脱吸附曲线(a)和通过BJH方法计算得到的孔径分布(b)

Fig. 3 Adsorption-desorption isotherm of N2 (a) for hierarchical porous CeO2 sample and pore size distribution (b) calculated using the BJH method

图4 分级多孔CeO2(a)和无孔氧化铈(b)的失重曲线

Fig. 4 Curves of the weight loss for hierarchical porous CeO2 (a) and nonporous CeO2 (b)

图5 不同样品的降解酸性品红的催化降解活性

Fig. 5 Catalytic degradation activity on acid fuchsine of various samples

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以枫叶为模板合成分级多孔氧化铈材料及其催化性能

Hierarchical Porous Ceria Synthesized by Maple Leaf Templates and Its Catalytic Performance

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