Spherical mesoporous TiO₂ fabricated by sodium dodecyl sulfate-assisted hydrothermal treatment and its photocatalytic decomposition of papermaking wastewater

详细信息    查看全文

• 作者：Bin Sun ; Guowei Zhou ; ^{guoweizhou@hotmail.com" class="auth_mail} ; Changwang Shao ; Bin Jiang¹ ; Jinli Pang ; Yan Zhang
• 关键词：Spherical mesoporous TiO2 ; Sodium dodecyl sulfate ; Photocatalytic activity ; Decomposition ; Papermaking wastewater
• 刊名：Powder Technology
• 出版年：April, 2014
• 年：2014
• 卷：256
• 期：Complete
• 页码：118-125
• 全文大小：2047 K

文摘

Spherical mesoporous TiO₂ particles were prepared by a facile hydrothermal treatment using titanium oxysulfate (TiOSO₄) with sodium dodecyl sulfate (SDS) as the structure-directing agent. The structure and morphology of the as-prepared TiO₂ particles were characterized by X-ray diffraction, transmission electron microscopy, field emission scanning electron microscopy, dynamic light scattering, Fourier transform infrared spectroscopy, and N₂ adsorption-desorption isotherms. The results indicate that the as-synthesized TiO₂ particles have spherical mesoporous structures. Moreover, the crystal phase of the particles was the only anatase structure. This finding was attributed to the presence of sulfate ion (SO₄^{2 鈭?/sup>), which inhibited the anatase-rutile phase transformation and improved the crystallinity of TiO₂ during TiOSO₄ hydrolysis. The spherical mesoporous TiO₂ materials have very high surface areas, and the mesopores have narrow pore size distributions. In the degradation of papermaking wastewater under ultraviolet light irradiation, the prepared TiO₂ particles exhibited high photocatalytic activity compared with the commercial Degussa P25. The effects of various parameters such as catalyst dosage, solution pH, and irradiation time on the photocatalytic activity of the fabricated TiO₂ powders are discussed. At the optimum dose of 1.0 g L鈭?#xA0;1 TiO₂ at pH 4, the particles prepared using an SDS:TiOSO₄ molar ratio of 0.6 exhibited the highest photocatalytic activity, achieving 83.6% COD_Cr removal rate in 12 h and 100% chroma removal rate in 8 h.}