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首页> 外文期刊>Applied Surface Science >Synthesis of S/Cr doped mesoporous TiO_2 with high-active visible light degradation property via solid state reaction route
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Synthesis of S/Cr doped mesoporous TiO_2 with high-active visible light degradation property via solid state reaction route

机译：固态反应路线合成具有高活性可见光降解性能的掺S / Cr掺杂介孔TiO_2

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摘要

S/Cr doped mesoporous TiO_2 (S-TiO_2, Cr-TiO_2, S-Cr-TiO_2) were successfully synthesized via a simple, effective and environmental benign solid state reaction route. The low angle XRD patterns demonstrated that the resulting samples possess mesostructures. The further characterizations via N_2 adsorption-desorption and XPS showed that the typical S/Cr co-doped mesoporous TiO_2 (S-Cr-TiO_2(5S-5Cr)) possesses mesopore with the high specific surface area of 118.4m~2/g and narrow pore size distribution, and both S and Cr have been incorporated into the lattice of TiO_2 with the amounts of 4.16% sulfur and 7.88% chromium, respectively. And Raman spectroscopy shows that the surface of S-Cr-TiO_2 (5S-5Cr) material possesses stretching vibrational peaks at ~709, ~793cm~(-1) are assignable to the Ti-O-Cr, O-Cr (Ti)-OH bonds, respectively. Interestingly, the UV-vis displayed that the absorption regions of S/Cr doped mesoporous TiO_2 cover the visible light region. As for the series of S-Cr-TiO_2 samples, the absorption region even extends to near infrared region with strong adsorption. Moreover, compared with the pure titanium dioxide (P25-TiO_2), the photodegradation properties of bromocresol green (BCG) on the S/Cr doped mesoporous TiO_2 showed excellent photocatalytic properties under visible light irradiation. Within 50 min visible light irradiation, 82.6% of the initial BCG was degraded for the S-Cr-TiO_2 (6S-4Cr) photocatalyst.
机译：通过简单，有效，环境友好的固态反应路线成功合成了掺S / Cr的介孔TiO_2（S-TiO_2，Cr-TiO_2，S-Cr-TiO_2）。低角度XRD图谱表明所得样品具有介观结构。通过N_2吸附-解吸和XPS的进一步表征表明，典型的S / Cr共掺杂介孔TiO_2（S-Cr-TiO_2（5S-5Cr））具有中孔，比表面积为118.4m〜2 / g，且相对较高。窄的孔径分布，并且S和Cr都已被掺入TiO_2的晶格中，硫的含量分别为4.16％，铬的含量为7.8％。拉曼光谱表明，S-Cr-TiO_2（5S-5Cr）材料的表面在〜709处具有拉伸振动峰，〜793cm〜（-1）可归属于Ti-O-Cr，O-Cr（Ti） -OH键分别。有趣的是，UV-vis显示出S / Cr掺杂的中孔TiO_2的吸收区域覆盖了可见光区域。对于一系列S-Cr-TiO_2样品，其吸收区域甚至延伸到具有强吸附力的近红外区域。此外，与纯二氧化钛（P25-TiO_2）相比，溴甲酚绿（BCG）在掺S / Cr的介孔TiO_2上的光降解性能在可见光照射下显示出优异的光催化性能。在50分钟的可见光照射下，S-Cr-TiO_2（6S-4Cr）光催化剂的初始BCG降解了82.6％。

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