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Photochemical Properties of C60 Nanocrystallines in the Aqueous Solution

Author: NiMing
Tutor: HeYiLiang
School: Shanghai Jiaotong University
Course: Environmental Engineering
Keywords: C60 Photochemical reactivity Proliferation Oxygen radicals
CLC: O613.71
Type: Master's thesis
Year: 2011
Downloads: 58
Quote: 0
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Abstract


The rapid development of nanotechnology bring tremendous changes in human life and production, potential environmental negative effects caused widespread concern. Nanomaterials by way of point source and non-point source release into the aquatic environment, the cumulative concentration with the nanomaterials market gradually increasing gradually reduced production costs and the continuous research and development of new products increases gradually. Fullerene (fullerene) is one of the carbon nano-materials are widely used in the field of physical chemistry, materials science and biomedical. In a wide variety of fullerene family, C 60 due to its peculiar physical and chemical properties and structure stability, a new world of nanomaterials, their environmental security increasingly attention. This thesis is relying on the National Natural Science Foundation (No. 20.90703 million) to C 60 for model carbon nanomaterials, photochemical reactivity characteristics in aqueous media, in-depth understanding of their environment transforming characteristics and the biological and ecological effects provide a theoretical basis. Papers mainly for the aqueous medium C 60 formed C crystal particles (nC 60 ) photochemical reactivity 60 nano three aspects Research work: 1. using toluene displacement method and aqueous solutions of long-term prepared by stir the nC 60 and by transmission electron microscopy, dynamic light scattering, and the Zeta potential other means the nC prepared 60 < / sub> Characterization; 2. explore water medium nC 60 of photochemical reactive characteristics, and surface active agents, including non-ionic surface active agent, the TX-100, TX-405, a cationic surface active agent CTAB and anionic surfactant SDS and natural organic matter (humic acid) nC 60 photochemical reactivity induced characteristics and mechanism of induction and explore the proliferation of state photochemistry of nC 60 reactive impact; 3. study the impact of the aqueous medium nC 60 of this effect to the role and environmental factors involved in the reaction of hydrogen peroxide and superoxide anion radical. The thesis study results show that: 1. Using toluene displacement method and an aqueous solution of the long-term mixing method can be successfully prepared the nC 60 . Characterization results show that the aqueous medium nC 60 negatively charged surface potential of-46mV, the average particle size of about 115 nm; 2 of nC 60 photochemical reactivity characteristics and induction characteristics of the studies show that water medium NC 60 lost with the photochemical reactivity in the molecular state, rather than ionic surfactant TX-100 can be induced to restore the activity of the photochemical reaction, and the induction of its nC 60 package, the redispersion related to the role; 3 in light conditions, the aqueous medium in nC 60 of hydrogen peroxide and superoxide anion radicals involved in the reaction catalytic role, and this role will be the impact of environmental conditions such as pH, light, and nC 60 concentration. The research found that the aqueous medium C 60 nanocrystalline particles can be coexisting substances induced recovery photochemical reactivity, at the same time promote the reaction of some involvement of oxygen free radicals, in-depth understanding of its Fate mechanism of biological toxicity in the environment and migration and transformation of great significance.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Non-metallic elements and their compounds > Part Ⅳ family of non-metallic elements (carbon and silicon ) and its compounds > Carbon C
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