以水杨酸为模板分子的Nd掺杂分子印迹TiO2的制备及光催化性能

doi:10.11896/cldb.201906007

材料导报

2019, Vol. 33

Issue (6): 947-953 https://doi.org/10.11896/cldb.201906007

无机非金属及其复合材料

以水杨酸为模板分子的Nd掺杂分子印迹TiO₂的制备及光催化性能

占昌朝^1,2, 曹小华^1,2, 金文雄¹, 叶志刚^1,2, 谢宝华^1,2, 徐建兴¹, 周荣辉¹

1 九江学院化学与环境工程学院,九江 332005
2 江西省生态化工工程技术研究中心,九江 332005

Fabrication and Photocatalytic Performance of Neodymium-doped Molecularly Imprinted Titanium Dioxide with Salicylic Acid as Template Molecule

ZHAN Changchao^1,2, CAO Xiaohua^1,2, JIN Wenxiong¹, YE Zhigang^1,2, XIE Baohua^1,2, XU Jianxing¹, ZHOU Ronghui¹

1 College of Chemistry and Environmental Engineering, Jiujiang University, Jiujiang 332005
2 Jiangxi Province Engineering Research Center of Ecological Chemical Industry, Jiujiang 332005

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摘要以水杨酸(SA)为模板分子,钛酸四丁酯为钛源,硝酸钕为掺杂剂,采用溶胶-凝胶法,在不同焙烧温度和不同Nd掺杂量下制备了一系列Nd掺杂分子印迹TiO₂(NMT)光催化剂。采用XRD、SEM、TEM、ICP-AES、EDS、XPS、FT-IR、N₂吸附-脱附(BET模型)、紫外-可见漫反射光谱(UV-Vis DRS)等手段对产物进行了表征,并以光催化降解SA为指针反应,考察了Nd掺杂量、焙烧温度、SA溶液初始pH值对产物光催化活性的影响。结果表明,NMT 为单一锐钛矿相,孔道结构的形成是晶粒堆积孔和模板剂脱除所致。相比非印迹TiO₂和未掺杂的分子印迹TiO₂,NMT对模板分子降解反应的光催化活性大大提高,且当n(Nd)∶n(TiO₂)= 0.30%、550 ℃热处理2 h时光催化活性最佳:紫外光下其作为光催化剂可以得到86.4%的降解率(SA模拟废水初始浓度为20 mg/L、初始pH=4,降解反应时间为70 min),重复使用四次降解率仍保持在83.02 %;可见光(λ＞400 nm)下可以得到97.96%的降解率(SA模拟废水初始浓度为20 mg/L、初始pH=4,降解反应时间为30 h)。

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	占昌朝
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	徐建兴
	周荣辉

关键词: 分子印迹钕(III) 二氧化钛水杨酸模板分子光催化溶胶-凝胶法紫外光可见光

Abstract: This contribution presents the fabrication, characterization and photocatalytic performance evaluation of neodymium-doped molecularly imprinted titanium dioxide (NMT) which is expected to serve as photocatalysts for organic compounds degradation in aqueous solution. We prepared a series of NMT samples via a sol-gel process, which differed in calcination temperature and Nd doping amount, by using salicylic acid (SA) as template, tetrabutyl titanate as titanium source and neodymium nitrate as dopant. The characterization of the resultant samples was carried out by means of XRD, SEM, TEM, ICP-AES, EDS, XPS, FT-IR, N₂ adsorption-desorption (BET model) and UV-Vis DRS. Moreover, we investigated the photocatalytic activities of the products toward the template molecules (SA), under both UV and visible light irradiations, and with various calcination temperatures, various Nd doping amounts, and various initial pH values of SA solution. The experimental results confirmed the single anatase phase composition of NMT, and a highly porous structure induced by accumulation of grain clusters and template removal. All the NMT samples displayed the photocatalytic activities much higher than those of undoped molecularly imprinted TiO₂ and ordinary (non-imprinted) TiO₂ for the degradation reaction of the template molecule (SA). The NMT sample with molar ratio of Nd/TiO₂ of 0.30% and calcination tempe-rature of 550 ℃ exhibited the highest photocatalytic activity, as it could achieve a 86.4% (within 70 min) degradation rate and a 97.96% (within 30 h) degradation rate for SA aqueous solution (initial concentration 20 mg/L, initial pH=4), under UV and visible irradiations, respectively. In addition, the degradation rate could remain above 83.02% within 4 times of reuse under UV irradiation.

Key words: molecular imprinting neodymium(III) titanium dioxide salicylic acid template molecule photocatalysis sol-gel method ultraviolet light visible light

出版日期: 2019-03-25 发布日期: 2019-04-03

ZTFLH:

O649.4

基金资助: 国家自然科学基金(51562016,21864015);江西省自然科学基金(20171BAB206015);九江学院科技基金(2016KJ005)

作者简介: 占昌朝,九江学院教授,硕士研究生导师

引用本文:

占昌朝, 曹小华, 金文雄, 叶志刚, 谢宝华, 徐建兴, 周荣辉. 以水杨酸为模板分子的Nd掺杂分子印迹TiO₂的制备及光催化性能[J]. 材料导报, 2019, 33(6): 947-953.
ZHAN Changchao, CAO Xiaohua, JIN Wenxiong, YE Zhigang, XIE Baohua, XU Jianxing, ZHOU Ronghui. Fabrication and Photocatalytic Performance of Neodymium-doped Molecularly Imprinted Titanium Dioxide with Salicylic Acid as Template Molecule. Materials Reports, 2019, 33(6): 947-953.

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http://www.mater-rep.com/CN/10.11896/cldb.201906007 或 http://www.mater-rep.com/CN/Y2019/V33/I6/947

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