高级搜索

钛酸盐纳米片光催化-吸附协同去除水中Cr(Ⅵ)和Cr(Ⅲ)

,  ,  , 

downloadPDF

上一篇

下一篇

王婷, 刘文, 李学钊, 焦晓琳. 钛酸盐纳米片光催化-吸附协同去除水中Cr(Ⅵ)和Cr(Ⅲ)[J]. 环境化学, 2015, 34(10): 1777-1784. doi: 10.7524/j.issn.0254-6108.2015.10.2015032302
引用本文: 王婷, 刘文, 李学钊, 焦晓琳. 钛酸盐纳米片光催化-吸附协同去除水中Cr(Ⅵ)和Cr(Ⅲ)[J]. 环境化学, 2015, 34(10): 1777-1784. doi: 10.7524/j.issn.0254-6108.2015.10.2015032302
shu
WANG Ting, LIU Wen, LI Xuezhao, JIAO Xiaolin. Simultaneous removal of Cr(Ⅵ) and Cr(Ⅲ) by titanate nanosheets through photocatalysis combined with adsorption[J]. Environmental Chemistry, 2015, 34(10): 1777-1784. doi: 10.7524/j.issn.0254-6108.2015.10.2015032302
Citation: WANG Ting, LIU Wen, LI Xuezhao, JIAO Xiaolin. Simultaneous removal of Cr(Ⅵ) and Cr(Ⅲ) by titanate nanosheets through photocatalysis combined with adsorption[J]. Environmental Chemistry, 2015, 34(10): 1777-1784. doi: 10.7524/j.issn.0254-6108.2015.10.2015032302
shu

钛酸盐纳米片光催化-吸附协同去除水中Cr(Ⅵ)和Cr(Ⅲ)

  • 1.

    北京大学环境工程实验室, 北京, 100871;

  • 2.

    北京大学深圳研究生院, 环境与能源学院, 深圳, 518055

  • 基金项目:

    黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金(K318009902-1428)资助.

Simultaneous removal of Cr(Ⅵ) and Cr(Ⅲ) by titanate nanosheets through photocatalysis combined with adsorption

  • 1.

    Laboratory of Environmental Engineering, Peking University, Beijing, 100871, China;

  • 2.

    School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, 518055, China

  • Fund Project:

  • 摘要: 以锐钛型纳米TiO2为原材料, 采用水热法合成了钛酸盐纳米片(TNS), 系统研究了Cr(Ⅵ)和Cr(Ⅲ)在TNS上的吸附行为, 以及不同pH下TNS光催化协同吸附对水体中Cr(Ⅵ)和Cr(Ⅲ)的同步去除.TEM及XRD表征结果表明, 制备的TNS呈现出锐钛矿与钛酸盐混合晶相, 这对于其光催化和吸附性能的发挥极为重要.吸附实验证实, TNS对Cr(Ⅵ)和Cr(Ⅲ)的吸附显著受pH影响, 高pH利于Cr(Ⅲ)的吸附, 而Cr(Ⅵ)在低pH下吸附量更大.Cr(Ⅵ)和Cr(Ⅲ)在TNS上的吸附速度较快, 吸附动力学符合准二级动力学模型(R2 > 0.99).吸附等温线结果符合Langmuir方程(R2 > 0.99), pH 5时, Cr(Ⅲ)的最大吸附量(13.19 mg·g-1)远大于Cr(Ⅵ)(0.63 mg·g-1), 因此, 单一吸附不是有效处理Cr(Ⅵ)的手段, 光催化还原是必要的.光催化-吸附实验表明, 随着pH的增加, TNS光催化还原Cr(Ⅵ)反应速率逐渐降低, 但产生的Cr(Ⅲ)在TNS表面的吸附量显著增加.综合可知, 光催化-吸附协同反应最佳pH值为5, Cr(Ⅵ)和总Cr的去除率可达97.6%, 且体系中无Cr(Ⅲ)的积累.该研究为同步有效去除水体中的Cr(Ⅵ)和Cr(Ⅲ)提供了一种新的可参照的途径.
    Abstract: Titanate nanosheets (TNS) were prepared using hydrothermal method via anatase TiO2 as raw material. The adsorption processes of Cr(Ⅵ) and Cr(Ⅲ) onto TNS were thoroughly studied, and simultaneous removal of Cr(Ⅵ) and Cr(Ⅲ) by synergetic photocatalysis and adsorption at various pHs was investigated. TEM and XRD analysis indicated that the as-prepared TNS exhibited multiple phases of anatase TiO2 and titanate, which were important for their photocatalysis and adsorption performance. Batch adsorption experiments depicted that pH significantly affected Cr(Ⅵ) and Cr(Ⅲ) adsorption onto TNS. The adsorption capacity of Cr(Ⅲ) was enhanced with increasing pH, while that of Cr(Ⅵ) was decreased. Both Cr(Ⅵ) and Cr(Ⅲ) were adsorbed rapidly by TNS, with the adsorption kinetics fitted well with the pseudo-second model (R2 > 0.99). In addition, the Langmuir model can describe well the adsorption isotherms of both Cr(Ⅵ) and Cr(Ⅲ) (R2 > 0.99), and the saturated adsorption capacity of Cr(Ⅲ) (13.19 mg·g-1) was much larger than that of Cr(Ⅵ) (0.63 mg·g-1). Therefore, adsorption alone is not an effective method for removal of Cr(Ⅵ) and photocatalysis is needed. Synergetic experiments of photocatalysis and adsorption suggested the apparent rate constant of Cr(Ⅵ) photocatalysis decreased dramatically with increase pH, while the adsorption of Cr(Ⅲ) was obviously facilitated. Taken together, the optimal pH for the synergy of photocatalysis and adsorption was pH 5, at which the removal efficiency of Cr(Ⅵ) and total Cr reached as high as 97.6%, and Cr(Ⅲ) was not detected in the solution. This study has provided a promising method for simultaneous removal of Cr(Ⅵ) and Cr(Ⅲ) from the wastewater.
  • 加载中
  • [1] 王亚军, 王进喜. 响应曲面法优化腐植酸去除水中重金属铬的吸附条件及热力学研究[J]. 环境化学, 2013, 32(12): 2282-2289
    [2] 刘淼, 董德明, 张白羽, 等.光催化法处理电镀含铬废水[J].吉林大学自然科学学报, 1998, 2: 99-101
    [3] 裘凯栋, 黎维彬. 水溶液中六价铬在碳纳米管上的吸附[J]. 物理化学学报, 2006, 22(12): 1542-1546
    [4] 戴遐明, 陈永华, 李庆丰, 等.半导体氧化物超细粉末对Cr(Ⅵ)的光催化还原作用研究[J].环境科学, 1996, 17(6):34-36
    [5] Sun A M, Zheng L M, Zheng S, et al. Preparation and characterization of TiO2/acid leached serpentinite tailings composites and their photocatalytic reduction of Chromium(Ⅵ) [J]. Journal of Colloid and Interface Science, 2013, 404: 102-109
    [6] Zheng S, Jiang W J, 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] Kasuga T, Hiramatsu M, Hoson A, et al. Formation of titanium oxide nanotube [J]. Langmuir, 1998, 14(12): 360-3163
    [8] Kasuga T, Hiramatsu M, Hoson A, et al. Titania nanotubes prepared by chemical processing [J]. Advanced Materials, 1999, 11(15): 1307-1311
    [9] Wang L, Liu W, Wang T, et al. Highly efficient adsorption of Cr(Ⅵ) from aqueous solutions by amino-functionalized titanate nanotubes [J]. Chemical Engineering Journal, 2013, 225: 153-163
    [10] Niu G J, Liu W, Wang T, et al. Absorption of Cr(Ⅵ) onto amino-modified titanate nanotubes using 2-Bromoethylamine hydrobromide through S(N)2 reaction [J]. Journal of Colloid and Interface Science, 2013, 401: 133-140
    [11] Wang T, Liu W, Xiong L, et al. Influence of pH, ionic strength and humic acid on competitive adsorption of Pb(Ⅱ), Cd(Ⅱ) and Cr(Ⅲ) onto titanate nanotubes [J]. Chemical Engineering Journal, 2013, 215: 366-374
    [12] Liu W, Wang T, Borthwick A G L, et al. Adsorption of Pb2+, Cd2+, Cu2+ and Cr3+ onto titanate nanotubes: Competition and effect of inorganic ions [J]. Science of the Total Environment, 2013, 456: 171-180
    [13] Hu C C, Hsu T C, Lu S Y. Effect of nitrogen doping on the microstructure and visible light photocatalysis of titanate nanotubes by a facile cohydrothermal synthesis via urea treatment [J]. Applied Surface Science, 2013, 280: 171-178
    [14] Grover I S, Singh S, Pal B.The preparation, surface structure, zeta potential, surface charge density and photocatalytic activity of TiO2 nanostructures of different shapes [J]. Applied Surface Science, 2013, 280: 366-372
    [15] Liu W, Ni J R, Yin X C. Synergy of photocatalysis and adsorption for simultaneous removal of Cr(Ⅵ) and Cr(Ⅲ) with titanatenanotbubes [J].Water Research, 2014, 53: 12-15
    [16] Rizzo L, Meric S, Kassinos D, et al. Degradation of diclofenac by TiO2photocatalysis: UV absorbance kinetics and process evaluation through a set of toxicity bioassays [J]. Water Research, 2009, 43(4): 979-988
    [17] Satterfield C N. Mass transfer in heterogeneous catalysis [M]. RE Krieger Publishing Company, 1981
    [18] Valente J P S, Padilha P M, Florentino A O. Studies on the adsorption and kinetics of photodegradation of a model compound for heterogeneous photocatalysis onto TiO2 [J]. Chemosphere, 2006, 64(7): 1128-1133
    [19] Ren L, Liu YD, Qi X, et al. An architectured TiO2 nanosheet with discrete integrated nanocrystalline subunits and its application in lithium batteries [J].Journal of Materials Chemistry, 2012, 22: 21513-21518
    [20] Wei M D, Konishi Y, Arakawa H. Synthesis and characterization of nanosheet-shaped titanium dioxide [J]. Journal of Materials Science, 2007, 42(2): 529-533
    [21] 韩云飞, 刘文, 王婷, 等. Cd(Ⅱ) 、Zn(Ⅱ) 、Cu(Ⅱ) 和Cr(Ⅲ) 在钛酸纳米管上的吸附行为[J], 环境化学, 2013, 32(11): 2007-2015
    [22] Huang J Q, Cao Y G, Deng Z H, et al. Formation of titanate nanostructures under different NaOH concentration and their application in wastewater treatment [J]. Journal of Solid State Chemistry, 2011, 184: 712-719
    [23] Xiong L, Chen C, Chen Q, et al. Adsorption of Pb(Ⅱ) and Cd(Ⅱ) from aqueous solutions using titanate nanotubes prepared via hydrothermal method [J]. Journal of Hazardous Materials, 2011, 189: 741-748
    [24] Langmuir I. The adsorption of gases on plane surfaces of glass, mica and platinum [J]. Journal of the American Chemical Society, 1918, 40(9): 1361-1403
    [25] Freundlich H. Vber die adsorption in lÜsungen [J]. Zeitschrift Fur Physikalische Chemie, 1906, 57: 385-470
    [26] Chen F T, Gao Y P, Liu Z, et al. Effective removal of high-chroma crystal violet over TiO2-based nanosheet by adsorption-photocatalytic degradation [J].Chemical Engineering Journal, 2012, 204-206: 107-113
  • 加载中
WeChat 点击查看大图
计量
  • 文章访问数:  1666
  • HTML全文浏览数:  1553
  • PDF下载数:  660
  • 施引文献:  0
出版历程
  • 收稿日期:  2015-03-23
  • 刊出日期:  2015-10-15
王婷, 刘文, 李学钊, 焦晓琳. 钛酸盐纳米片光催化-吸附协同去除水中Cr(Ⅵ)和Cr(Ⅲ)[J]. 环境化学, 2015, 34(10): 1777-1784. doi: 10.7524/j.issn.0254-6108.2015.10.2015032302
引用本文: 王婷, 刘文, 李学钊, 焦晓琳. 钛酸盐纳米片光催化-吸附协同去除水中Cr(Ⅵ)和Cr(Ⅲ)[J]. 环境化学, 2015, 34(10): 1777-1784. doi: 10.7524/j.issn.0254-6108.2015.10.2015032302
shu
WANG Ting, LIU Wen, LI Xuezhao, JIAO Xiaolin. Simultaneous removal of Cr(Ⅵ) and Cr(Ⅲ) by titanate nanosheets through photocatalysis combined with adsorption[J]. Environmental Chemistry, 2015, 34(10): 1777-1784. doi: 10.7524/j.issn.0254-6108.2015.10.2015032302
Citation: WANG Ting, LIU Wen, LI Xuezhao, JIAO Xiaolin. Simultaneous removal of Cr(Ⅵ) and Cr(Ⅲ) by titanate nanosheets through photocatalysis combined with adsorption[J]. Environmental Chemistry, 2015, 34(10): 1777-1784. doi: 10.7524/j.issn.0254-6108.2015.10.2015032302
shu

钛酸盐纳米片光催化-吸附协同去除水中Cr(Ⅵ)和Cr(Ⅲ)

  • 1.  北京大学环境工程实验室, 北京, 100871;
  • 2.  北京大学深圳研究生院, 环境与能源学院, 深圳, 518055
  • 收稿日期:  2015-03-23
基金项目:

黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金(K318009902-1428)资助.

摘要: 以锐钛型纳米TiO2为原材料, 采用水热法合成了钛酸盐纳米片(TNS), 系统研究了Cr(Ⅵ)和Cr(Ⅲ)在TNS上的吸附行为, 以及不同pH下TNS光催化协同吸附对水体中Cr(Ⅵ)和Cr(Ⅲ)的同步去除.TEM及XRD表征结果表明, 制备的TNS呈现出锐钛矿与钛酸盐混合晶相, 这对于其光催化和吸附性能的发挥极为重要.吸附实验证实, TNS对Cr(Ⅵ)和Cr(Ⅲ)的吸附显著受pH影响, 高pH利于Cr(Ⅲ)的吸附, 而Cr(Ⅵ)在低pH下吸附量更大.Cr(Ⅵ)和Cr(Ⅲ)在TNS上的吸附速度较快, 吸附动力学符合准二级动力学模型(R2 > 0.99).吸附等温线结果符合Langmuir方程(R2 > 0.99), pH 5时, Cr(Ⅲ)的最大吸附量(13.19 mg·g-1)远大于Cr(Ⅵ)(0.63 mg·g-1), 因此, 单一吸附不是有效处理Cr(Ⅵ)的手段, 光催化还原是必要的.光催化-吸附实验表明, 随着pH的增加, TNS光催化还原Cr(Ⅵ)反应速率逐渐降低, 但产生的Cr(Ⅲ)在TNS表面的吸附量显著增加.综合可知, 光催化-吸附协同反应最佳pH值为5, Cr(Ⅵ)和总Cr的去除率可达97.6%, 且体系中无Cr(Ⅲ)的积累.该研究为同步有效去除水体中的Cr(Ⅵ)和Cr(Ⅲ)提供了一种新的可参照的途径.

English Abstract

    全文HTML

参考文献 (26)

返回顶部

目录

/

返回文章
返回

Copyright © 2019 中国科学院生态环境研究中心