Details

Autor(en) / Beteiligte

• Ju, Yongming
• Hong, Jianming
• Zhang, Xiuyu
• Xu, Zhencheng
• Wei, Dongyang
• Sang, Yanhong
• Fang, Xiaohang
• Fang, Jiande
• Wang, Zhenxing

Titel

Synthesis of surface sulfated BiWO with enhanced photocatalytic performance

Ist Teil von

• Journal of environmental sciences (China), 2012-01, Vol.24 (12), p.2180-2190

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2012

Quelle

MEDLINE

Beschreibungen/Notizen

• Sulfated BiWO （SBiWO） was synthesized by an impregnation method to enhance the visible-light-driven photoactivities of BiWO （BiWO）. The characterization results verified that sulfate anion mainly anchored on the catalyst surface greatly extended the visible- light-responsive range without destroying the crystal lattice. Moreover, the SBiWO-based photoactivities were evaluated with the removal of Malachite Green （MG） under UV-Vis irradiation emitted from two microwave-powered electrodeless discharge lamps （MPEDL_2） and under visible light （L 〉 420 nm）. The results demonstrated that the kinetic constant was increased 2.25 times, varying from 0.1478 （BiWO） to 0.3328 rain-1 （SBiWO- 1 ）. Similar results were also obtained for the visible light-driven reaction. Furthermore, radical scavengers such as t-butanol restricted the visible-light induced degradation of MG over BiWO and SBiWO-1. This indicated that the sulfating process increased the generation of reactive oxygen species, which was further verified by molecular probe with salicylic acid. Thus, more blue-shifting at k = 618 nm was observed over SBiWO. On the basis of the above results, the photocatalytic mechanism over the sulfated catalyst was also discussed.