CdS/Regenerated Cellulose Nanocomposite Films for Highly Efficient Photocatalytic H2 Production under Visible Light Irradiation
CdS/Regenerated Cellulose Nanocomposite Films for Highly Efficient Photocatalytic H2 Production under Visible Light Irradiation
复制标题
CdS/再生纤维素纳米复合薄膜在可见光照射下高效光催化产氢
DOI：
10.1021/jp903378q
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发表时间：
2009-09-10
影响因子：
3.7
通讯作者：
Peng, Tianyou
中科院分区：
文献类型：
--
作者：
Ke, Dingning;Liu, Shilin;Peng, Tianyou
研究了不同孔径的多孔再生纤维素（RC）膜负载CdS纳米粒子的光催化活性。利用透射电子显微镜、扫描电子显微镜、X射线衍射、热重分析和紫外-可见漫反射光谱对所得CdS/RC纳米复合薄膜进行了表征。通过调节纤维素溶液的浓度，可以将多孔RC膜的平均孔径从约20至57 nm进行调节，并且RC膜内的多孔结构充当反应位点，以导致平均粒径约为8 nm的US纳米颗粒的嵌入。在可见光（λ ≥ 420 nm）照射下，以Na 2S-Na 2SO 3混合溶液为牺牲剂，研究了CdS/RC纳米复合薄膜的光催化析氢效率。实验结果表明，与CdS纳米粒子悬浮体系相比，该纳米复合膜具有可见光催化产氢活性高、光稳定性好、再生方便等优点。这一新的制备便携式可见光催化剂的途径对于通过“绿色”工艺生产H-2具有重要意义。
The photocatalytic activities of CdS nanoparticles immobilized in porous regenerated cellulose (RC) films with different pore sizes were investigated. The resulting CdS/RC nanocomposite films were characterized by using transmission electron microscopy, scanning electron microscopy, X-ray diffraction, thermal gravimetric analysis, and UV-vis diffuse reflectance spectroscopy. The mean pore sizes of the porous RC films can be modulated from about 20 to 57 nm by adjusting the concentration of the cellulose solution, and the porous structures within RC film act as reacting sites to lead to the embedment of US nanoparticles with a mean particle diameter of about 8 nm. The photocatalytic H-2 evolution efficiencies over the obtained CdS/RC nanocomposite films were investigated by using Na2S-Na2SO3 mixed solution as a sacrificial reagent under visible-light (lambda >= 420 nm) irradiation. Experimental results indicate that the present nanocomposite films revealed obvious predominance, such as high visible-light photoactivity for H-2 production, enduring photostability, and convenient regeneration in comparison with CdS nanoparticles suspension system. This new pathway for the fabrication of portable visible-light-driven photocatalyst is important for the H-2 production via "green" processes.