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三氧化钨的生物合成及其对亚甲基蓝的光降解实验
0
(西安建筑科技大学环境与市政工程学院)
摘要:
利用菌株Pantoea sp.IMH生物合成三氧化钨(WO3)材料并对合成条件进行优化,通过高分辨透射电镜(HRTEM)、选区电子衍射(SAED)、X射线能谱(EDS)及X射线粉末衍射(XRD)对生物合成的WO3材料进行表征,同时研究了其光降解亚甲基蓝的性能。结果表明生物合成WO3的最优合成条件是钨酸钠反应浓度为100 mmol?L?1、pH为2、细胞与钨酸钠反应时间为10 h、且煅烧温度为800 ℃,在该条件下WO3为多晶片状结构。相比于标品WO3和化学合成纳米WO3,生物合成WO3材料对亚甲基蓝染料具有更好的光降解性能,可以在紫外光照射40 min内完全光降解亚甲基蓝(50 mL,0.0375mmol?L?1)。利用N2吸附-解吸等温线、对苯二甲酸(TA)荧光探针法、紫外漫反射(DRS)光谱和X射线光电子(XPS)能谱分别对不同WO3材料进行检测,结果表明生物合成WO3的良好催化性能与材料的比表面积、羟基自由基产量以及氧空位等均有关系。
关键词:  水污染  三氧化钨  生物合成  亚甲基蓝  光降解  比表面积  羟基自由基  氧空位
DOI:
投稿时间:2018-06-12修订日期:2018-11-15
基金项目:国家自然科学基金(41373123);陕西省自然科学基础研究基金资助项目(2018JM5156)
Biosynthesis of tungsten trioxide and their photodegradation of methylene blue
WANG Ya''nan1,2,3,2,4, LI Wei1,2,3,2,4, JIA Qianqian1,2,3,2,4, DUAN Jinming1,2,3,2,4
(1.School of Environmental and Municipal Engineering,Xi'2.'3.an University of Architecture and Technology,Xi'4.an 710055)
Abstract:
Tungsten trioxide (WO3) was biosynthesized by Pantoea sp. IMH and the synthesis conditions were optimized. Multiple techniques, including high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD) were used to identify and characterize the biosynthesized WO3. The characterization results show that the biosynthesized WO3 was rectangular sheet, polycrystalline structure, synthesized at the optimized conditions including 100 mmol?L?1 Na2WO4, pH=2, reaction time (10 h) of cells with Na2WO4, and calcination temperature (800℃). The photodegradation of methylene blue by biosynthesized WO3 was also studied. Compared with the standard WO3 and chemical nano-sized WO3, biosynthesized WO3 has better performance on the degradation of methylene blue. Methylene blue (50 mL, 0.0375mmol?L?1) could be completely photodegradated under ultraviolet light within 40 min by biosynthesized WO3. Different WO3 materials were determined by N2 adsorption-desorption isotherms, fluorescence probe method with terephthalic acid (TA), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS) and X-ray photoelectron spectroscopy (XPS). The analysis results confirms that the property of specific surface area, hydroxyl radical and oxygen vacancies contributed to excellent photocatalytic activity of biosynthesized WO3.
Key words:  water pollution  tungsten trioxide  biosynthesis  methylene blue  photodegradation  specific surface area  hydroxyl radical  oxygen vacancies