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Porous TiO2 with large surface area is an efficient catalyst carrier for the recovery of wastewater containing an ultrahigh concentration of dye
RSC Advances ( IF 3.9 ) Pub Date : 2018-01-16 00:00:00 , DOI: 10.1039/c7ra11985b
Yumeng Zhou 1 , Lijing Zhang 1 , Shengyang Tao 1
Affiliation  

The preparation of porous TiO2 as a carrier for the Fenton reaction is reported. Porous TiO2 is an excellent carrier to load with elemental iron due to the large specific surface area and negative surface charge. Porous TiO2 was synthesized in the form of a hierarchically porous silica monolith that was used as a microreactor, and a block copolymer served as a template for mesoporous forms. The crystalline TiO2 growing in confined spaces maintained the porous structure and high crystallinity. The surface area of our synthesized porous TiO2 can reach 205 m2 g−1. The zeta potential of the TiO2 was as low as −36.5 mV (pH 7). Elemental iron was highly and uniformly dispersed over the channel of the porous TiO2 via an impregnation method and served as the catalyst for the Fenton reaction. In the Fenton reaction, the synthesized catalyst performed strong catalytic activity during the degradation of wastewater containing an ultrahigh concentration of aqueous dye, at 400 ppm. The aqueous dye solution was degraded over 95% in 30 min, and the catalyst could be reused many times.

中文翻译:

具有大表面积的多孔二氧化钛是一种高效的催化剂载体,用于回收含有超高浓度染料的废水

报道了制备多孔TiO 2作为芬顿反应的载体。由于大的比表面积和负表面电荷,多孔TiO 2是负载元素铁的优良载体。多孔 TiO 2以分层多孔二氧化硅单块的形式合成,用作微反应器,嵌段共聚物用作中孔形式的模板。在密闭空间中生长的结晶TiO 2保持了多孔结构和高结晶度。我们合成的多孔TiO 2的表面积可以达到205 m 2 g -1TiO 2的 zeta 电位低至 -36.5 mV (pH 7)。元素铁通过浸渍方法高度均匀地分散在多孔TiO 2 的通道上,并作为芬顿反应的催化剂。在芬顿反应中,合成的催化剂在降解含有超高浓度 400 ppm 水性染料的废水时表现出很强的催化活性。染料水溶液在30 min内降解95%以上,催化剂可多次重复使用。
更新日期:2018-01-16
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