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 Synthesis of porous carbon nanotubes foam composites with high accessible surface area and tuneable porosity
Tác giả hoặc Nhóm tác giả: Yuefeng Liu, Housseinou Ba, Dinh-Lam Nguyen , Ovidiu Ersen, Thierry Romero, Dominique Begin, Izabela Janowska, Cuong Pham-Huu
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Nơi đăng: Journal of Materials Chemistry A
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; Số: 1;Từ->đến trang: 9508-9516;Năm: 2013
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
A macroscopic shaping of carbon nanostructure materials with tuneable porosity, morphologies, and functions, such as carbon nanotubes (CNT) or carbon nanofibers, into integrated structures is of high interest, as it allows a development of novel nanosystems with high performances in filter application and catalysis. In the present work, we report on a low temperature chemical fusion (LTCF) method to synthesize self-macronized carbon nanotubes foam (CNT-foam) with controlled size and shape by using CNT as a skeleton, dextrose as a carbon source, and citric acid as carboxyl group donor reacting with hydroxyl group present in dextrose. The obtained composite has a 3D pore structure with high accessible surface area (> 350 m2/g) and tuneable meso- and macro-porosity by adding a various amount of ammonium carbonate into the starting mixture followed by a direct thermal decomposition. The as-synthesized CNT-foam also exhibits a relatively high mechanical strength which facilitates it handling and transport, while the nanoscopic morphology of the CNT significantly reduces the problem of diffusion and contributes to an improvement of the effective surface area for subsequence applications. These CNT-foams are successfully employed as selective and recyclable organic absorber in the field of waste water treatment.
ABSTRACT
A macroscopic shaping of carbon nanostructure materials with tuneable porosity, morphologies, and functions, such as carbon nanotubes (CNT) or carbon nanofibers, into integrated structures is of high interest, as it allows a development of novel nanosystems with high performances in filter application and catalysis. In the present work, we report on a low temperature chemical fusion (LTCF) method to synthesize self-macronized carbon nanotubes foam (CNT-foam) with controlled size and shape by using CNT as a skeleton, dextrose as a carbon source, and citric acid as carboxyl group donor reacting with hydroxyl group present in dextrose. The obtained composite has a 3D pore structure with high accessible surface area (> 350 m2/g) and tuneable meso- and macro-porosity by adding a various amount of ammonium carbonate into the starting mixture followed by a direct thermal decomposition. The as-synthesized CNT-foam also exhibits a relatively high mechanical strength which facilitates it handling and transport, while the nanoscopic morphology of the CNT significantly reduces the problem of diffusion and contributes to an improvement of the effective surface area for subsequence applications. These CNT-foams are successfully employed as selective and recyclable organic absorber in the field of waste water treatment.
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