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首页> 美国卫生研究院文献>Frontiers in Chemistry >Catalytic and Photocatalytic Nitrate Reduction Over Pd-Cu Loaded Over Hybrid Materials of Multi-Walled Carbon Nanotubes and TiO2
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Catalytic and Photocatalytic Nitrate Reduction Over Pd-Cu Loaded Over Hybrid Materials of Multi-Walled Carbon Nanotubes and TiO2

机译：多壁碳纳米管与TiO2杂化材料负载Pd-Cu的催化和光催化硝酸盐还原

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TiO2 and carbon nanotube-TiO2 hybrid materials synthesized by sol-gel and loaded with 1%Pd−1%Cu (%wt.) were tested in the catalytic and photocatalytic reduction of nitrate in water in the presence of CO2 (buffer) and H2 (reducing agent). Characterization of the catalysts was performed by UV-Vis and fluorescence spectroscopy, X-ray diffraction, temperature programed reduction, N2 adsorption, and electron microscopy. The presence of light produced a positive effect in the kinetics of nitrate removal. Higher selectivity toward nitrogen formation was observed under dark condition, while the photo-activated reactions showed higher selectivity for the production of ammonium. The hybrid catalyst containing 20 %wt. of carbon nanotubes shows the best compromise between activity and selectivity. A mechanism for the photocatalytic abatement of nitrate in water in the presence of the hybrid materials was proposed, based in the action of carbon nanotubes as light harvesters, dispersing media for TiO2 particles and as charge carrier facilitators.
机译：通过溶胶-凝胶合成并负载了1％Pd-1％Cu（％wt。）的TiO2和碳纳米管-TiO2杂化材料在CO2（缓冲液）和H2存在下催化和光催化还原水中硝酸盐的过程中进行了测试（还原剂）。通过UV-Vis和荧光光谱，X射线衍射，程序升温还原，N 2吸附和电子显微镜对催化剂进行表征。光的存在对硝酸盐去除动力学产生积极影响。在黑暗条件下观察到较高的氮形成选择性，而光活化反应显示出较高的选择性以生产铵。该杂化催化剂含有20重量％。碳纳米管的数量显示出活性和选择性之间的最佳折衷。基于碳纳米管作为光收集器，TiO2颗粒的分散介质和电荷载体的促进剂，提出了在杂化材料存在下光催化消除水中硝酸盐的机制。

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