摘要
采用水热法合成了多孔结构Bi2WO6光催化剂,借助X射线衍射(XRD)、场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)、X射线能量色散谱(EDS)、紫外可见漫反射(UV-Vis-DRS)、N2吸附/脱附等测试手段对样品的物相组成、形貌、比表面孔径分布和光吸收特性等进行了表征。考察了水热温度、水热反应时间对Bi2WO6的形貌、比表面孔径分布和光吸收特性影响,并探讨了Bi2WO6光催化剂对模拟燃油的脱硫活性。结果表明,在强酸性条件下水热温度和水热时间对Bi2WO6的形貌、比表面积和催化活性影响显著,190℃水热反应2 h所得Bi2WO6为新颖的鸟巢状微晶,且鸟巢状Bi2WO6由片层状二级结构组装而成。XRD和EDS表明,鸟巢状结构的Bi2WO6为正交晶系,纯度较高。N2吸附脱附测试结果表明,鸟巢状Bi2WO6具有多孔结构,孔主要分布在10 nm,比表面积大约为17.49 m2/g。催化活性测试结果表明,三维介孔结构Bi2WO6具有较好的模拟燃油脱硫效果,在空气流量为100 mL/min,催化剂加入量为1.2 g/L,可见光照射180 min,模拟汽油脱硫率高达91.2%,且催化剂的稳定性能较好。
Porous-Bi2WO6 was synthesized by a hydrothermal process. The phase composition, morphology, surface area/pore size distribution and optical properties of as-synthesized BiEWO6 sample were investigated by X-ray diffrac- tion （XRD）, filed-scanning electron microscope （FE-SEM）, transmission electron mcroscope （TEM）, energy disper- sive spectrometer （EDS）, UV-Vis absorption spectrum （UV-Vis-DRS）, and low-temperature N2 adsorption/desorption techniques. Furthermore, the photocatalytic oxidative desulfurization （Photo-ODS） activity of as-synthesized BiEWO6 samples was also investigated. The experimental results reveal that reaction temperature and reaction time have a sig- nificant effect on the morphology and structure of BiEWO6 under the strong acidic medium. After 2 h of reaction at 190℃, the as-obtained sample exhibits a novel nest-like 3D BiEWO6 microcrystal with scales of 3-4 μm. HR-SEM reveals that the 3D nest-like BiEWO6 microcrystal composes of many small secondary nanoplates. XRD and EDS results confirm that the as-synthesized D nest-like Bi2WO6 microcrystal is orthorhombic pure-Bi2WO6. N; adsorp- tion/desorption isotherms and the pore distribution result show that nest-like 3D Bi2WO6 microcrystal has pores in the size of 6-8 nm and the BET surface area is calculated to be as much as 17.49 m2/g. The photocatalytic experimental result illustrates that as-synthesized 3D nest-like porous BizWO6 microcrystals exhibit an excellent photocatalytic per- formance to photocatalytic oxidative desulfiarization for simulated fuel oil under sun-like light irradiation. Under the conditions of 100 mL/min air flow, 1.2 g/L photocatalyst amount, and visible-light irradiation for 180 min, the desul- furization rate of simulated fuel oil reaches 91.2%, and the stability of photoctalyst is also good.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第10期1079-1086,共8页
Journal of Inorganic Materials
基金
国家自然科学基金重点项目(20973133)
陕西省教育厅自然科学基金(12JK0597)
陕西省科技厅工业攻关项目(2013k11-08)
延安市工业攻关项目(2011kg-13)~~
关键词
水热法
三维多孔Bi2WO6
光催化氧化
模拟燃油脱硫
hydrothermal three-dimensional porous Bi2WO6
photocatalytic oxidation
desulfurization of simiu-lated fuel oil
