CNTs表面改性与TiO2-CNTs异质结光催化性能

doi:10.3866/PKU.WHXB201303212

Abstract

Abstract:

Carbon nanotubes (CNTs) have been ultrasonically treated with the mixed acid (H₂SO₄/HNO₃, 3:1, volume ratio), embedding the active －COOH groups onto the surface of the CNTs. As a result, the acid-treated CNTs serve as chemical reactors for subsequent grafting of L-lysine or octadecylamine (ODA). It was revealed that L-lysine and ODA covalently bond to the surface of the oxidized CNTs through amidation of carboxylic acid groups (CNTs-COOH) and lysine or ODA via intermediate acyl chlorides (CNTs-COCl). The hydrophilic and lipophilic CNTs have high aquatic and ethanol solubility, and the solubility of the surface modified CNTs in water and ethanol were measured to be as high as 6.85 and 10.15 mg·mL^-1, respectively. The surface nature of modified CNTs and the properties of TiO₂-CNTs composite photocatalysts, which were prepared through sol-gel or low temperature hydrothermal synthesis, were investigated by Fourier transform infrared (FTIR), laser Raman, X-ray diffraction (XRD), Brunauer-Emmett-Teller N2 adsorption, transmission electron microscopy (TEM), and X-ray photoelectron spectrum (XPS). Improved photocatalytic performance was observed for TiO₂ coupled by hydrophilic or lipophilic CNT, which were obtained by low temperature hydrothermal and sol-gel synthesis, respectively, and it was revealed that there is an affinity between the photocatalytic performance of TiO₂-CNTs hybrids and the dispersibility of CNTs. It is proposed that the improved photocatalytic activity of CNT-TiO₂ compared with pure TiO₂ photocatalysts can be mainly attributed to the homogeneous and dense dispersion of TiO₂ on the modified CNTs and the intimate contact between TiO₂ and CNTs, which results in dense heterojunctions at the interface of TiO₂ and CNTs through the Ti－O－C structure.

Key words: Carbon nanotubes, Surface modification, Solubility, TiO₂, Photocatalytic degradation

YANG Han-Pei, ZHANG Ying-Chao, FU Xiao-Fei, SONG Shuang-Shuang, WU Jun-Ming. Surface Modification of CNTs and Improved Photocatalytic Activity of TiO₂-CNTs Heterojunction[J]. Acta Phys. -Chim. Sin. 2013, 29(06), 1327-1335. doi: 10.3866/PKU.WHXB201303212

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Surface Modification of CNTs and Improved Photocatalytic Activity of TiO₂-CNTs Heterojunction

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Surface Modification of CNTs and Improved Photocatalytic Activity of TiO₂-CNTs Heterojunction