水热法合成纳米CdWO_4及其光催化性能研究
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摘要
通过水热法合成光催化性能良好的纳米CdWO_4。采用粉末X射线衍射、扫描电子显微镜研究溶液pH值及水热温度对CdWO_4微观形貌、晶体结构的影响。在紫外线光照下甲基橙降解实验中测试制备的CdWO_4纳米颗粒的光催化活性。结果表明,合成的催化剂为单斜晶系CdWO_4晶体,不含其他杂质。水热反应温度150℃时,随着溶液pH值的降低(10.0→9.20→8.60),CdWO_4颗粒逐渐减小,紫外光照射90 min后,甲基橙降解率分别为20%、 26%和40%,其降解动力学参数k分别为0.002 3 min~(-1)、0.003 3 min~(-1)、0.005 7 min~(-1)。水热反应温度升高至180℃,pH为8.60时,合成的CdWO_4催化剂呈细针状,具有最高的光催化活性,光照90 min后,甲基橙降解率70%,降解动力学参数k=0.026 2 min~(-1)。
CdWO_4 photocatalyst was synthesized via a hydrothermal method and characterized by scanning electron microscope(SEM) and X-ray diffraction(XRD) to determine effects of pH value and hydrothermal temperature on CdWO_4 micromorphology and crystal structure.The photocatalytic activity of CdWO_4 photocatalyst was evaluated by degrading of methyl orange under UV-light irradiation.Results show that the synthesized photocatalyst is a pure monoclinic phase of CdWO_4 without any impurities.When hydrothermal reaction temperature is 150 ℃,with the decrease of pH value(10.0→9.20→8.60),particle size of CdWO_4 decrease.The degradation rate of methyl orange under ultraviolet light for 90 min was 20%,26% and 40%,respectively.The corresponding kinetic rate constant of the degradation k is 0.002 3 min~(-1),0.003 3 min~(-1),and 0.005 7 min~(-1), respectively.When hydrothermal reaction temperature is 180 ℃ and pH value is 8.60,the CdWO_4 photocatalyst is fine needles-likes and possess the highest catalytic activity, of which the degradation rate of methyl orange under is up to 70% and corresponding k is 0.026 2 min~(-1).
CdWO_4 photocatalyst was synthesized via a hydrothermal method and characterized by scanning electron microscope(SEM) and X-ray diffraction(XRD) to determine effects of pH value and hydrothermal temperature on CdWO_4 micromorphology and crystal structure.The photocatalytic activity of CdWO_4 photocatalyst was evaluated by degrading of methyl orange under UV-light irradiation.Results show that the synthesized photocatalyst is a pure monoclinic phase of CdWO_4 without any impurities.When hydrothermal reaction temperature is 150 ℃,with the decrease of pH value(10.0→9.20→8.60),particle size of CdWO_4 decrease.The degradation rate of methyl orange under ultraviolet light for 90 min was 20%,26% and 40%,respectively.The corresponding kinetic rate constant of the degradation k is 0.002 3 min~(-1),0.003 3 min~(-1),and 0.005 7 min~(-1), respectively.When hydrothermal reaction temperature is 180 ℃ and pH value is 8.60,the CdWO_4 photocatalyst is fine needles-likes and possess the highest catalytic activity, of which the degradation rate of methyl orange under is up to 70% and corresponding k is 0.026 2 min~(-1).
引文
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[3]Liu Huajun,Peng Tianyou,Ke Dingning,et al. Preparation and photocatalytic activity of dysprosium doped tungsten trioxide nanoparticles[J]. Materials Chemistry and Physics,2007,104(2/3):377-383.
[4]张铁,黄若男,王晓敏,等. Ti O2光催化联合技术降解苯酚机制及动力学[J].环境科学,2013,(2):596-603.Zhang Tie,Huang Ruonan,Wang Xiaomin,et al. Mechanism and kinetics of phenol degradation by Ti O2photocatalytic combined technologies[J]. Environmental Science,2013,(2):596-603.
[5]Yu Jiaguo,Cheng Bei,Qi Lifang,et al. Effect of calcination temperatures on microstructures and photocatalytic activity of tungsten trioxide hollow microspheres[J]. Journal of Hazardous Materials,2008,160(2/3):621-628.
[6]Mena E,Rey A,Rodriguze E M,et al. Reaction mechanism and kinetics of DEET visible light assisted photocatalytic ozonation with WO3catalyst[J]. Applied Catalysis B:Environmental,2017,202:460-472.
[7]Yu Weilai,Zhang Jinfeng,Peng Tianyou. New insight into the enhanced photocatalytic activity of N-,C-and Sdoped Zn O photocatalysts[J]. Applied Catalysis B:Environmental,2016,181:220-227.
[8]Mishra M,Chun Doo-Man.α-Fe2O3as a photocatalytic material:a review[J]. Applied Catalysis A:General,2015,498:126-141.
[9]Zhu Yuxiang,Wang Yanfei,Chen Zhi,et al. Visible light induced photocatalysis on Cd S quantum dots decorated Ti O2nanotube arrays[J]. Applied Catalysis A:General,2015,498:159-166.
[10]Rajagopal S,Nataraj D,Khyzhun O Y,et al. Hydrothermal synthesis and electronic properties of Fe WO4and Co WO4nanostructures[J]. Journal of Alloys and Compounds,2010,493(1/2):340-345.
[11]Parhi P,Karthik T N,Manivannan V. Synthesis and characterization of metal tungstates by novel solid-state metathetic approach[J]. Journal of Alloys and Compounds,2008,465(1/2):380-386.
[12]Ruiz-Fuertes J,Errandonea D,Segura A,et al. Growth,characterization,and high-pressure optical studies of CuWO4[J]. High Pressure Research,2008,28(4):565-570.
[13]Meddar L,Josse M,Deniard P,et al. Effect of nonmagnetic substituents Mg and Zn on the phase competition in the multiferroic antiferromagnet MnWO4[J]. Chemistry of Materials,2009,21(21):5203-5214.
[14]Fu H,Lin J,Zhang L,et al. Photocatalytic activities of a novel Zn WO4catalyst prepared by a hydrothermal process[J]. Applied Catalysis A:General,2006,306:58-67.
[15]Shang Meng,Wang Wenzhong,Xu Haolan. New Bi2WO6nanocages with high visible-light-driven photocatalytic activities prepared in refluxing EG[J]. Crystal Growth and Design,2008,9(2):991-996.
[16]Shan Zhichao,Wang Yaoming,Ding Hanming,et al. Structure-dependent photocatalytic activities of MWO4(M=Ca,Sr,Ba)[J]. Journal of Molecular Catalysis A:Chemical,2009,302(1/2):54-58.
[17]Ye Dong,Li Danzhen,Zhang Wenjuan,et al. A new photocatalyst Cd WO4prepared with a hydrothermal method[J].The Journal of Physical Chemistry C,2008,112(44):17351-17356.
[18]Yan Tingjiang,Li Liping,Tong Wenming,et al. Cd WO4polymorphs:selective preparation,electronic structures,and photocatalytic activities[J]. Journal of Solid State Chemistry,2011,184(2):357-364.
[19]Li Di,Bai Xiaojuan,Xu jing,et al. Synthesis of Cd WO4nanorods and investigation of the photocatalytic activity[J]. Physical Chemistry Chemical Physics,2014,16(1):212-218.
[20]Hosseinpour-Mashkani S M,Sobhani-Nasab A. A simple sonochemical synthesis and characterization of Cd WO4nanoparticles and its photocatalytic application[J]. Journal of Materials Science:Materials in Electronics,2016,27(4):3240-3244.
[21]Debnath T,Das S,Das D,et al. Optical,magnetic and dielectric properties of Zn O:Y nanoparticles synthesized by hydrothermal method[J]. Journal of Alloys and Compounds,2017,696:670-681.
[22]Nassar M Y,Mohamed T Y,Ahmed I S,et al. MgO nanostructure via a sol-gel combustion synthesis method using different fuels:an efficient nano-adsorbent for the removal of some anionic textile dyes[J]. Journal of Molecular Liquids,2017,225:730-740.