Photocatalytic activity of CdS and Ag(2)S quantum dots deposited on poly(amidoamine) functionalized carbon nanotubes.
Photocatalytic activity of CdS and Ag(2)S quantum dots deposited on poly(amidoamine) functionalized carbon nanotubes.
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DOI：
10.1016/j.apcatb.2011.08.031
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发表时间：
2011-10-02
期刊：
影响因子：
--
通讯作者：
Oki, Aderemi
中科院分区：
文献类型：
--
作者：
Neelgund, Gururaj M.;Oki, Aderemi
通过将第四代(G4)超支化、交联型聚酰胺胺(PAMAM)共价接枝到羧化多壁碳纳米管(MWCNTs-COOH)上，然后沉积Cd或Ag2S量子点，成功地构建了两种新型三元纳米催化剂f-MWCNTs-CDS和f-MWCNTs-Ag2S。采用紫外-可见光谱、傅里叶变换红外光谱、粉末X射线衍射、拉曼光谱、热重分析、扫描电子显微镜和能谱等手段对功能化多壁碳纳米管(f-MWCNTs)和纳米催化剂的结构转变、表面电势和形貌进行了表征。透射电子显微镜显示量子点有效地锚定在f-MWCNTs上。用紫外光催化降解甲基橙的方法评价了纳米催化剂的催化活性。MWCNTs、PAMAM与CdS或Ag2S量子点的偶联显著提高了纳米催化剂的催化效率。用朗缪尔-辛谢尔伍德模型计算了纳米催化剂存在下甲基橙的降解速率常数。总体而言，在光降解方面的卓越表现是通过将f-MWCNTs与Cd或Ag2S杂化来实现的
Two novel ternary nanocatalysts, f-MWCNTs-CdS and f-MWCNTs-Ag2S were successfully constructed by covalent grafting of fourth generation (G4) hyperbranched, crosslinked poly(amidoamine) (PAMAM) to carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) and subsequent deposition of CdS or Ag2S quantum dots (QDs). The structural transformation, surface potential, and morphology of functionalized MWCNTs (f-MWCNTs) and nanocatalysts were characterized by UV-vis spectrophotometer, Fourier transform infrared spectroscopy, powder X-ray diffraction, Raman spectroscopy, thermogravimetric analysis, scanning electron microscopy and energy dispersive spectroscopy. Transmission electron microscopy reveals the effective anchoring of QDs on f-MWCNTs. The catalytic activity of nanocatalysts was evaluated by photodegradation of methyl orange under illumination of UV light. The coupling of MWCNTs, PAMAM and CdS or Ag2S QDs significantly enhanced the catalytic efficiency of nanocatalysts. The rate constants for degradation of methyl orange in presence of nanocatalysts were calculated using the Langmuir-Hinshelwood model. Overall, the excellence in photodegradation was accomplished by hybridizing f-MWCNTs with CdS or Ag2S
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