Green synthesis of halloysite nanotubes supported Ag nanoparticles for photocatalytic decomposition of methylene blue
Green synthesis of halloysite nanotubes supported Ag nanoparticles for photocatalytic decomposition of methylene blue
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DOI：
10.1088/0022-3727/45/32/325302
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发表时间：
2012-07
期刊：
影响因子：
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通讯作者：
Meiling Zou;Mingliang Du;Han Zhu;Congsheng Xu;Yaqin Fu
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文献类型：
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作者：
Meiling Zou;Mingliang Du;Han Zhu;Congsheng Xu;Yaqin Fu
以茶多酚（TP）为还原剂，采用简单、绿色的方法制备了埃洛石纳米管（HNT）负载银纳米粒子（AgNP），并将其用于光催化降解亚甲基蓝（MB）。首先用N-β-氨乙基-γ-氨丙基三甲氧基硅烷（AEAPTMS）将HNTs功能化，引入氨基形成N-HNTs，固定AgNPs，然后合成AgNPs并将其“锚定”在HNTs表面。利用傅里叶变换红外光谱对HNTs表面的氨基进行了表征。利用透射电子显微镜、场发射扫描电子显微镜和X射线衍射表征由AgNPs支撑的合成HNTs（AgNPs@N-HNTs）的结构和形态。结果表明，AgNPs已经合成并“锚定”在HNTs的表面上，直径约为20-30 nm。X射线光电子能谱分析表明，银纳米粒子与TP分子的N原子之间存在螯合作用。以亚甲基蓝（MB）为降解对象，考察了AgNPs@N-HNTs催化剂的光催化活性，结果表明，该催化剂对MB具有良好的催化活性和吸附能力。
Using tea polyphenols (TPs) as a reductant, Ag nanoparticles (AgNPs) supported on halloysite nanotubes (HNTs) were simply and greenly synthesized for the photocatalytic decomposition of methylene blue (MB). HNTs were initially functionalized by N-β-aminoethyl-γ-aminopropyl trimethoxysilane (AEAPTMS) to introduce amino groups to form N-HNTs to fasten the AgNPs; then AgNPs were synthesized and ‘anchored’ on the surface of the HNTs. Fourier transform infrared spectroscopy was employed to testify the amino groups on the surface of the HNTs. Transmission electron microscopy, field-emission scanning electron microscopy and x-ray diffraction were utilized to characterize the structure and morphology of the synthesized HNTs supported by the AgNPs (AgNPs@N-HNTs). The results showed that the AgNPs had been synthesized and ‘anchored’ onto the surface of the HNTs with a diameter of about 20–30 nm. X-ray photoelectron spectroscopy analysis revealed the chelating interaction between the AgNPs and N atoms together with the TP molecular. The photocatalytic activity of the as-prepared AgNPs@N-HNTs catalyst was evaluated by decomposition of MB; the results showed that the prepared catalyst exhibited excellent catalytic activity and high adsorption capability to MB.