胺功能化硅/钛薄膜增强甲醛降解。

Enhancement of formaldehyde degradation by amine functionalized silica/titania films.

机构信息

Department of Chemical Engineering, King Mongkut's University of Technology Thonburi, 126 Pracha-utit Road, Bangmod, Bangkok 10140, Thailand.

出版信息

J Environ Sci (China). 2009;21(12):1741-6. doi: 10.1016/s1001-0742(08)62482-1.

DOI:10.1016/s1001-0742(08)62482-1

PMID:20131607

Abstract

Doping amine functional groups into SiO2/TiO2 films for enhancing the decomposition of formaldehyde has been investigated using the modified sol-gel method to prepare organic-inorganic hybrid photocatalysts via the co-condensation reaction of methyltrimethoxysilane (MTMOS) and amine functional groups. n-(2-Aminoethyl)-3-aminopropyl-trimethoxysilane (AEAPTMS) and 3-aminopropyl-trimethoxysilane (APTMS) were selected to study the effect of amine functional groups on the enhancement of formaldehyde adsorption and degradation under a UV irradiation process. Physicochemical properties of prepared photocatalysts were characterized with nitrogen adsorption-desorption isotherms measurement, X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectroscopy. The results indicated that the APTMS/SiO2/TiO2 film demonstrated a degradation efficiency of 79% superior to those of SiO2/TiO2 and AEAPTMS/SiO2/TiO2 films due to the synergetic effect of adsorption and photocatalytic properties. The APTMS/SiO2/TiO2 film can be recycled with about 7% decreasing of degradation efficiency after seven cycles.

摘要

将掺杂胺官能团的 SiO2/TiO2 薄膜用于增强甲醛分解，已通过改良溶胶-凝胶法进行研究，以通过甲基三甲氧基硅烷（MTMOS）和胺官能团的共缩合反应制备有机-无机杂化光催化剂。选择 n-(2-氨乙基)-3-氨丙基三甲氧基硅烷（AEAPTMS）和 3-氨丙基三甲氧基硅烷（APTMS）来研究胺官能团对增强甲醛在 UV 照射下的吸附和降解的影响。使用氮吸附-解吸等温线测量、X 射线衍射（XRD）和傅里叶变换红外（FT-IR）光谱对制备的光催化剂的物理化学性质进行了表征。结果表明，由于吸附和光催化性能的协同作用，APTMS/SiO2/TiO2 薄膜的降解效率达到 79%，优于 SiO2/TiO2 和 AEAPTMS/SiO2/TiO2 薄膜。APTMS/SiO2/TiO2 薄膜在经过七次循环后，降解效率仅降低了约 7%，仍可回收利用。