One-step, hydrothermal synthesis of nitrogen, carbon co-doped titanium dioxide (N,C-TiO2) photocatalysts. Effect of alcohol degree and chain length as carbon dopant precursors on photocatalytic activity and catalyst deactivation
One-step, hydrothermal synthesis of nitrogen, carbon co-doped titanium dioxide (N,C-TiO2) photocatalysts. Effect of alcohol degree and chain length as carbon dopant precursors on photocatalytic activity and catalyst deactivation
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DOI：
10.1016/j.apcatb.2011.12.007
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发表时间：
2012-04-05
影响因子：
22.1
通讯作者：
Puma, G. Li
中科院分区：
文献类型：
--
作者：
Dolat, D.;Quici, N.;Puma, G. Li
展示了一种合成氮、碳共掺杂二氧化钛 (N,C-TiO2) 光催化剂的一步水热法。通过 FTIR/DRS 和 XPS 分析证实了氨中的氮和不同链长的醇（甲醇、乙醇、异丙醇、1-丁醇、2-丁醇、叔丁醇）用作碳前体的碳的结合。改性光催化剂的紫外-可见/DR吸收光谱扩展到可见光。 XRD、BET 和 Zeta Sizer-Nano 技术用于表征改性光催化剂。 N,C-TiO2 的微晶尺寸不受醇的性质或改性过程中获得的压力的影响，但表面积、颗粒尺寸（晶体团聚体）和锐钛矿含量随合成压力的增加而增加。与文献中的其他研究相比，不同合成材料的光活性是在环形光反应器中以恒定的光子吸收体积速率（VRPA）进行评估的。这种创新方法可以评估每种材料的固有光活性。结果，由于每种浆料悬浮液吸收的总辐射能保持恒定，因此评估了 NC 共改性对 TiO2 光活性的影响，而不受每种悬浮粉末吸收的辐射量的干扰。苯酚分解证实活性随着醇前体链长的增加而增加。由 2-丁醇和 1-丁醇作为碳前体制备的 N,C-TiO2 具有最高的本征光活性，与原始 TiO2 和商用 Degussa P25 光催化剂相比，其在多次催化剂重复使用过程中也表现出更强的抗失活能力。 (C) 2011 Elsevier B.V. 保留所有权利。
A one-step, hydrothermal method for the synthesis of nitrogen, carbon co-doped titanium dioxide (N,C-TiO2) photocatalysts is demonstrated. The incorporation of nitrogen from ammonia and carbon from alcohols with different chain length (methanol, ethanol, isopropanol, 1-butanol, 2-butanol, tert-butanol) used as carbon precursors was confirmed by FTIR/DRS and XPS analyses. The UV-vis/DR absorption spectra of the modified photocatalysts extended into the visible. XRD, BET and Zeta Sizer-Nano techniques were used for the characterization of the modified photocatalysts. The crystallite size of N,C-TiO2 was not affected by the nature of the alcohol or the pressure acquired during the modification process but surface area, particle size (crystal agglomerate) and anatase content increased with synthesis pressure. In contrast with other studies in literature, the photoactivity of the different synthesized materials was evaluated at a constant volumetric rate of photon absorption (VRPA) in an annular photoreactor. This innovative method allows the evaluation of the intrinsic photoactivity of each material. As a result, the effect of NC-co-modification on the TiO2 photoactivity was evaluated without interference from the amount of radiation absorbed by each suspended powder since the total radiant energy absorbed by each slurry suspension was kept constant. Phenol decomposition confirmed that activity increased with the chain length of the alcohol precursor. The highest intrinsic photoactivity was for N,C-TiO2 prepared from 2-butanol, and 1-butanol as carbon precursor which also exhibited much stronger resistance to deactivation during multiple catalyst reuse compared to pristine TiO2 and commercial Degussa P25 photocatalysts. (C) 2011 Elsevier B.V. All rights reserved.