P25半导体矿物光催化还原U(Ⅵ)

罗昭培; 董发勤; 何辉超; 刘明学; 代群威; 宗美荣; 王萍萍; 王岩; 李刚; 马杰

doi:10.7538/hhx.2017.39.01.0030

P25半导体矿物光催化还原U(Ⅵ)

1.
西南科技大学环境与资源学院,四川绵阳621010
2.
西南科技大学固体废物处理与资源化教育部重点实验室,四川绵阳621010
3.
西南科技大学材料科学与工程学院,四川绵阳621010
4.
西南科技大学生命科学与工程学院,四川绵阳621010

计量
- 文章访问数: 1205
- HTML全文浏览量: 0
- PDF下载量: 4764
出版历程
- 刊出日期: 2017-02-19

Photocatalytic Reduction of U(Ⅵ) by P25 Semiconductor Mineral

1.
School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China
2.
Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China
3.
School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
4.
School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China

摘要

摘要: 采用直流电压法将P25型TiO₂粉末负载于FTO导电玻璃制成半导体矿物电极，研究其在不同小分子有机物（甲酸、甲醇、乙酸、乙醇）、不同浓度（0、20、40、60、80、100 mmol/L）甲酸作为空穴捕获剂下对U(Ⅵ)的光催化还原。研究结果表明，由于电离能力的强弱不同，酸类小分子有机物对空穴的捕获能力强于醇类小分子有机物，添加的小分子有机物均能提高U(Ⅵ)的还原率且甲酸效果最好，添加60 mmol甲酸光催化反应4 h后，U(Ⅵ)的还原率能达到90.26%。扫描电镜（SEM）及能谱（EDS）分析表明，反应后电极表面有大颗粒方块状U(Ⅳ)的矿物生成，占据反应活性位点。电化学阻抗分析显示，反应后电极传递电子的阻力增大，电子传输能力减弱，催化活性降低。
- 小分子有机物 /
- P25 /
- U(Ⅵ) /
- 电化学阻抗 /
- 空穴捕获剂
Abstract: The TiO₂(P25) semiconductor mineral electrode was used to study the photocatalytic reduction of U(Ⅵ) with low-molecular-weight organics (formic acid, methanol, acetic acid, ethanol) and formic acid at different concentrations (0, 20, 40, 60, 80, 100 mmol/L) as hole scavengers, respectively. The results indicate that due to the higher ionizing ability, the hole scavenging capacity of low-molecular-weight organic acid is stronger than that of low-molecular-weight alcohol. In addition, all hole scavengers studied in this paper can improve the reduction rate of U(Ⅵ) and formic acid is best with the reduction rate as high as 90.26% at 60 mmol/L. SEM and EDS results show that some squares of uranium minerals were formed after photocatalytic reaction, which were adsorbed on the electrode surface and occupied active sites of TiO₂. Electrochemical impedance spectroscopy (EIS) analysis indicates that mineral semiconductor electrode exhibits a higher electron transport resistance ability after photocatalytic reaction.
- low-molecular-mass organics /
- P25 /
- U(Ⅵ) /
- electrochemical impedance spectroscopy /
- hole scavenge

HTML全文

参考文献(21)

[1]	Bai J, Yao H J, Fan F L, et al. Biosorption of uranium by chemically modified rhodotorula glutinis[J]. J Environ Radioact, 2010, 101(11): 969-973.
[2]	McMaster S A, Ram R, Pownceby M I, et al. Characterisation and leaching studies on the uranium mineral betafite (U,Ca)(2)(Nb,Ti,Ta)(2)O-7[J]. Minerals Engineering, 2015, 81: 58-70.
[3]	肖益群,周彦同,夏良树,等.改性稻秆吸附 U(Ⅵ)的特性研究[J].核化学与放射化学,2015,37(1):51-57.
[4]	Wang L, Wen M, Wang W Y, et al. Photocatalytic degradation of organic pollutants using rGO supported TiO₂-CdS composite under visible light irradiation[J]. J Alloys Compds, 2016, 683: 318-328.
[5]	Zhao J H. Research on UV/TiO₂ photocatalytic oxidation of organic matter in drinking water and its influencing factors[J]. Appl Mechan Mater, 2014, 12(Part A): 2358-2362.
[6]	Zheng S, Jiang W, Rashid M, et al. Selective reduction of Cr(Ⅵ) in chromium, copper and arsenic (CCA) mixed waste streams using UV/TiO₂ photocatalysis[J]. Molecules, 2015, 20(2): 2622-2635.
[7]	Zhu X, Wang Y, Zhou D. TiO₂ photocatalytic degradation of tetracycline as affected by a series of environmental factors[J]. Journal of Soils & Sediments, 2014, 14(8): 1350-1358.
[8]	Liu W, Zhao X, Wang T, et al. Adsorption of U(Ⅵ) by multilayer titanate nanotubes: effects of inorganic cations, carbonate and natural organic matter[J]. Chem Eng J(Amsterdam, Neth), 2016, 286: 427-435.
[9]	Yakout S M. Evaluation of mineral and organic acids on the selective separation of radioactive elements (U and Th) using modified carbon[J]. Desalin Water Treat, 2016, 57(7): 3292-3297.
[10]	Wang S T, Liu H L, Liu W, et al. Effect of low-molecular-weight organic acids on nano-hydroxyapatite adsorption of cadmium and lead[J]. J Biomater Tissue Eng, 2016, 6(6): 433-439.
[11]	Qamar M, Gondal M A, Yamani Z H. Laser-induced efficient reduction of Cr(Ⅵ) catalyzed by ZnO nanoparticles[J]. J Hazard Mater, 2011, 187(1-3): 258-263.
[12]	Chakrabarti S, Chaudhuri B, Bhattacharjee S, et al. Photo-reduction of hexavalent chromium in aqueous solution in the presence of zinc oxide as semiconductor catalyst[J]. Chem Eng J(Amsterdam, Neth), 2009, 153(1): 86-93.
[13]	Shao D D, Fan Q H, Li J X, et al. Removal of Eu(Ⅲ) from aqueous solution using ZSM-5 zeolite[J]. Microporous Mesoporous Mater, 2009, 123(1): 1-9.
[14]	Dozzi M V, Saccomanni A, Selli E. Cr(Ⅵ) photocatalytic reduction: effects of simultaneous organics oxidation and of gold nanoparticles photodeposition on TiO2[J]. J Hazard Mater, 2012, s211-212(211-212): 188-195.
[15]	Belloni J, Treguer M, Remita&Amp H, et al. Enhanced yield of photoinduced electrons in doped silver halide crystals[J]. Nature, 1999, 402(6764): 865-867.
[16]	Guo Y, Li L, Li Y, et al. Adsorption and photocatalytic reduction activity of uranium(Ⅵ) on zinc oxide/rectorite composite enhanced with methanol as sacrificial organics[J]. J Radioanal Nucl Chem, 2016, 310(2): 883-890.
[17]	Wang G, Zhen J, Zhou L, et al. Adsorption and photocatalytic reduction of U(Ⅵ) in aqueous TiO₂ suspensions enhanced with sodium formate[J]. J Radioanal Nucl Chem, 2015, 304(2): 579-585.
[18]	孔海霞.电化学阻抗图谱法TiO₂薄膜光电极能带结构和催化活性研究[D].太原:太原理工大学,2004.
[19]	Singh L K, Karlo T, Pandey A. Electrochemical impedance spectroscopic study of anatase TiO₂ nanoparticle[J]. Materials Science Forum, 2014, 781: 127-133.
[20]	Wall J D, Krumholz L R. Uranium reduction[J]. Annu Rev Microbiol, 2006, 60(1): 149-166.
[21]	宗美荣,何辉超,董发勤.钠盐溶液中U(Ⅵ)的电化学电子转移与晶化研究[J].高等学校化学学报,2016,37(9):1701-1709.

施引文献

资源附件(0)

计量

文章访问数: 1205
HTML全文浏览量: 0
PDF下载量: 4764
被引次数: 0

P25半导体矿物光催化还原U(Ⅵ)

计量

出版历程

Photocatalytic Reduction of U(Ⅵ) by P25 Semiconductor Mineral

计量

出版历程

目录