化工新型材料

化工新型材料 ›› 2018, Vol. 46 ›› Issue (6) : 194-198.

科学研究

罗丹明B表面分子印迹N-TiO₂的制备及其在可见光下的选择性光催化研究

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Preparation of rhodamine B surface molecular imprinted N-TiO₂ and its selective photocatalytic activity under visible-light

Zhang Yang, An Ya, Wei Shengpei, Tian Juan, Qin Haoli

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Received		Published
2017-02-14		2018-07-03
Issue Date	Revised Date
2018-07-03	2017-02-14

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摘要

以溶胶-凝胶法制备的氮掺杂二氧化钛(TiO₂)为基质,以罗丹明B(RhB)为模板分子,以邻苯二胺为交联剂和功能单体,在紫外光下引发聚合,制备了RhB表面分子印迹N-TiO₂-MIP。采用傅立叶红外光谱(FT-IR)、X射线衍射(XRD)、紫外-可见光漫反射吸收光谱(UV-Vis)等对样品进行了表征。结果表明:样品为纳米级锐钛矿相;氮(N)掺杂因N_2p与O_2p混合引起禁带窄化,表面包覆及分子印迹均有效改善了TiO₂孔型和孔隙结构,增大了比表面积,N-TiO₂-MIP对目标污染物RhB的降解率高达93.2%,并具有良好的选择性。

Abstract

Rhodamine B surface molecular imprinted N-TiO₂ was synthesized by surface molecular imprinting technique using nitrogen-doped TiO₂ as the substrate prepared by sol-gel technique,rhodamine B as the template molecule,o-phenylenediamine as cross linking agent and the functional monomer,polymerized under UV irradiation.The samples were characterized by FT-IR,XRD,UV-Vis diffuse reflectance spectrophotometer and N₂ adsorption-desorption.The results indicated that titania all were anatase with nanometer size.The red-shift of absorption edge was caused by both narrowed energy gap by mixed of N_2p and O_2p induced by nitrogen doped to TiO₂ and π-π^* transition from the domain of conjugate structure with poly (o-phenylenediamine).The pass and pore structure were improved effectively by nitrogen-doping,surface coating and molecular imprinting,the specific surface area was increased.Compared with four kinds of pollutant degradation,due to specific recognition sites caused by molecular imprinting,it showed that a good selectivity for the target pollutants rhodamine B under visible-light,the degradation was 93.2%.

关键词

二氧化钛 / 氮掺杂 / 罗丹明B / 分子印迹 / 选择性 / 可见光活性

Key words

titanium dioxide / nitrogen-doping / rhodamine B / molecular imprinting / selectivity / visible-light activity

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罗丹明B表面分子印迹N-TiO₂的制备及其在可见光下的选择性光催化研究[J]. 化工新型材料, 2018, 46(6): 194-198 DOI:

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