Construction of inorganic nanoparticles by micro-nano-porous structure of cellulose matrix |
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Authors: | Shilin Liu Dingning Ke Jian Zeng Jinping Zhou Tianyou Peng Lina Zhang |
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Institution: | (1) Department of Chemistry, Wuhan University, Wuhan, 430072, China; |
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Abstract: | In our previous work, the CdS nanoparticles/cellulose films exhibited significantly high photocatalytic H2 production efficiency under visible light irradiation than the ordinary CdS photocatalyst. In present paper, the CdS nanoparticles
were synthesized in situ in pores of the regenerated cellulose substrate and the porous structure of cellulose, formation
of the CdS nanoparticles and interactions between CdS and cellulose matrix in the composite films were investigated deeply.
The experimental results indicated that the micro-nano-porous structure of the cellulose matrix could be used easily to create
inorganic nanoparticles, which supplied not only cavities for the formation of nanoparticles, but also a shell (semi-stiff
cellulose molecules support the pore wall) to protect their nano-structure. When the cellulose films with porous structure
at wet state were immersed into inorganic ions solution, the ions interacted immediately with the –OH groups of cellulose,
and then transformed into inorganic composite via another treatment, finally inorganic nanoparticles formed during the dry.
The pore size of the cellulose matrix decreased from 180 nm (at wet state) to about 18 nm (at dry state), leading to the formation
of nanoparticles. The results revealed that the CdS nanoparticles with a mean particle diameter about 6 nm were dispersed
well, and were immobilized tightly in the cellulose matrix, resulting in a portable photocatalyst with high efficiency for
photocatalytic for H2 evolution. This is simple and “green” pathway to prepare the organic–inorganic hybrid materials. |
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