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Potassium Tantalate K6Ta10.8O30 with Tungsten Bronze Structure and Its Photocatalytic Property

Chinese Journal of Chemistry 2017年第2期35卷 189-195页

作者： Junting Wang Chun Xiao Xiaoyong Wu gaoke Zhang School of Resources and Environmental Engineering Wuhan University of Technology Wuhan 430070 China

With the tunable and flexible physicochemical properties, tantalate photocatalysts with tungsten bronze struc- ture are worth being studied. In this work, we successfully synthesized a novel potassium tantalate K6Talo.8030 with tungsten bronze structure using a facile solid-state reaction route. The effects of calcination time on the phase com- position, morphology and crystallinity of the obtained samples were studied by XRD and SEM analyses. In addition, the photocatalytic activity of the samples was evaluated by the degradation of ARg dye under UV light irradiation. The results indicated that the K6Talo.8030 showed high photocatalytic activity for degradation of ARg and the pho- tocatalytic degradation of ARg followed the first order kinetics. Furthermore, the possible photocatalytic mecha- nism of the K6TamsO30 photocatalyst was proposed based on tungsten bronze structure feature and the scavengers experimental results. This study would give a new insight into tantalate photocatalysts.

关键词： tantalum tungsten bronze structure K6Ta10.8O30 solid-phase reaction photocatalysis acid red g

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Characterization and Photocatalytic Activity of KSr_2Nb_5O_(15) with Tungsten Bronze Structure

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Journal of Wuhan University of Technology(Materials Science) 2009年第5期24卷 742-746页

作者：张高科 School of Resources and Environmental Engineering Wuhan University of Technology

Tungsten bronze （TB） type potassium strontium niobate KSr2Nb5O15 was prepared by solid-state reaction method, and was characterized by X-ray diffraction （XRD）,scanning electron microscopy （SEM） and UV-vis diffuse spectrum. The photocatalyst shows high photocatalytic activity of photodegrading acid red g. The effects of photocatalyst dosage and initial concentration of acid red g on the photodegradation process were studied. The kinetics of photocatalytic degradation of acid red g by KSr2Nb5O15 catalyst follows the first order reaction.

关键词： potassium strontium niobate photocatalyst solid state reaction tungsten bronze acid red g

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Facile synthesis of Ag_2O-TiO_2/sepiolite composites with enhanced visible-light photocatalytic properties

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Chinese Journal of Catalysis 2015年第12期36卷 2219-2228页

作者：杜玉汤丹丹张高科吴晓勇武汉理工大学资源与环境工程学院湖北武汉430070 武汉理工大学硅酸盐建筑材料国家重点实验室湖北武汉430070

Ag2O-TiO 2/sepiolite heterostructure composites were synthesized by a simple two-step method at low temperatures（100–450 °C）. acid red g aqueous solution and gaseous formaldehyde were chosen as model organic pollutants to evaluate the photocatalytic performance of the as-prepared composites. The results showed that the Ag2O-TiO 2/sepiolite exhibited enhanced photocatalytic activity over pure Ag2O-TiO 2,TiO 2/sepiolite,and Ag2O/sepiolite under visible-light irradiation（λ 420 nm）. The excellent photocatalytic efficiency of these composites can be ascribed to the synergistic effect between the heterojunction and the porous structure of the clay layers,which induced high adsorption and efficient charge separation. In addition,the active species involved in the degradation reaction have been investigated by photoluminescence spectroscopy and quenching experiments. A possible photocatalytic degradation mechanism of acid red g dye by the Ag2O-TiO 2/sepiolite composite is also discussed.

关键词： Silver oxide Titanium dioxide Sepiolite Heterostructure Photocatalysis acid red g Photocatalytic mechanism

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