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柱状石墨烯膜反渗透滤盐特性及机理

张泽程 刘珍 王孟妮 张福建 张忠强

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柱状石墨烯膜反渗透滤盐特性及机理

张泽程, 刘珍, 王孟妮, 张福建, 张忠强

Reverse osmotic characteristics and mechanism of pillared graphene membranes for water desalination

Zhang Ze-Cheng, Liu Zhen, Wang Meng-Ni, Zhang Fu-Jian, Zhang Zhong-Qiang
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  • 柱状石墨烯在能源气体的存储运输和气体净化分离等方面备受关注, 但其在海水淡化方面受到了大面积制备的限制, 其反渗透特性和机理尚未明晰. 本文运用分子动力学方法研究了不同压强、温度和膜的剪切运动对柱状石墨烯膜反渗透滤盐特性的影响规律. 结果表明: 压强较大时, 水通量随着压强的增加而线性增加; 温度的升高能提升水分子渗透率, 但对离子截留率的影响不大; 反渗透膜的剪切运动虽然会阻碍水分子的渗透, 但相应地可以提高离子截留率. 对氢键和离子水合结构的分析表明, 反渗透膜的剪切运动可以提高氢键和离子水合壳的稳定性, 但温度的升高会产生相反的效果. 本文结果有助于深入理解柱状石墨烯膜在不同条件下的脱盐性能, 进一步验证了柱状石墨烯膜在海水淡化领域的巨大应用潜力.
    Because of the high water flux and excellent ion rejection, the pores graphene is considered as a promising candidate material for fabricating the membranes in reverse osmosis (RO) process. Unfortunately, water molecules cannot pass through the perfect graphene, and how to effectively create a large number of nanopores with controllable size remains a challenge, which seriously prevents the practical application and development of graphene membrane for desalination. Recently, the emergence of pillared graphene (PGN) might open a new way for designing the graphene-based membranes, which can compensate for the deficiency of porous graphene membrane. The PGN has been extensively studied in gas storage and separation, and its RO characteristics and mechanism still remain unclear because the limitation of large area preparation in desalination. In this paper, the RO process of seawater through PGN membranes is investigated by molecular dynamics simulations, and the influences of the pressure within feed solution, temperature and the shearing of membrane on the desalination properties are considered. It is found that the water flux increases linearly with the pressure within feed solution increasing, and the PGN membrane with nanopore diameter of 0.8 nm can conduct water molecules but completely rejects high-concentration ions. As the diameter of nanopores increases to 1.2 nm, the rise of temperature can increase the permeability of water molecules, whereas the salt rejection is not appreciably sensitive to the temperature. Particularly, the shearing membrane can improve the salt rejection and hinder the water molecules from permeating at the same time. The designed PGN membrane exhibits excellent performance of water purification, and the ultrahigh water flux obtained in this work reaches 56.15 L·cm–2·day–1·MPa–1 with a salt rejection of 88.9%. Subsequently, the hydrogen bond dynamics is calculated in order to explain the variation of water permeability under different conditions. The result shows that the rise of temperature reduces the stability of hydrogen bonds and leads the water flux to increase, while the increase of shearing speed will enhance the stability of hydrogen bonds and inhibit water seepage. Furthermore, the analysis results of hydrogen bond and ionic hydration structure show that the shear motion on RO membrane will improve the stability of ionic hydration shell, which makes it more difficult for the ions to pass through nanopores by weakening the hydration shell. On the contrary, rising temperature will impair the strength of ionic hydration shell, leading more ions to pass through the RO membrane. The simulation results can provide an in-depth understanding of the desalination performance of PGN membrane under different key conditions, and further demonstrate the promising applications of graphene-based membrane in water desalination.
      通信作者: 张忠强, zhangzq@ujs.edu.cn
    • 基金项目: 国家自然科学基金(批准号: 11872192)资助的课题
      Corresponding author: Zhang Zhong-Qiang, zhangzq@ujs.edu.cn
    • Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11872192)
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    Park H B, Kamcev J, Robeson L M, Elimelech M, Freeman B D 2017 Science 356 1137Google Scholar

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    Lee K P, Arnot T C, Mattia D 2011 J. Membrane Sci. 370 1Google Scholar

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    Sint K, Wang B Y, Kral P 2008 J. Am. Chem. Soc. 130 16448Google Scholar

    [5]

    Cohen-Tanugi D, Grossman J C 2012 Nano Lett. 12 3602Google Scholar

    [6]

    Cohen-Tanugi D, Lin L C, Grossman J C 2016 Nano Lett. 16 1027Google Scholar

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    Cohen-Tanugi D, Grossman J C 2014 J. Chem. Phys. 141 074704Google Scholar

    [8]

    Zhang Z Q, Zhang F J, Liu Z, Cheng G G, Wang X D, Ding J N 2018 Nanomaterials (Basel) 8 805Google Scholar

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    Ali M E A, Wang L Y, Wang X Y, Feng X S 2016 Desalination 386 67Google Scholar

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    Hosseini M, Azamat J, Erfan-Niya H 2018 Appl. Surf. Sci. 427 1000Google Scholar

    [11]

    Jafarzadeh R, Azamat J, Erfan-Niya H 2018 Struct. Chem. 29 1845Google Scholar

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    Wang Y H, He Z J, Gupta K M, Shi Q, Lu R F 2017 Carbon 116 120Google Scholar

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    Surwade S P, Smirnov S N, Vlassiouk I V, Unocic R R, Veith G M, Sheng Dai S, Mahurin S M 2015 Nat. Nanotechnol. 10 459Google Scholar

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    Song L B, Guo Z G, Chai G B, Wang Z H, Li Y G, Luan Y B 2018 Carbon 140 210Google Scholar

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    Sakhavand N, Shahsavari R 2017 ACS Appl. Mater. Interfaces 9 39122Google Scholar

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    Wu C D, Fang T H, Lo J Y 2012 Int. J. Hydrogen Energy 37 14211Google Scholar

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    Lü R, Cruz-Silva E, Terrones M 2014 ACS Nano 8 4061Google Scholar

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    Wang Y C, Zhu Y B, Wang F C, Liu X Y, Wu H A 2017 Carbon 118 588Google Scholar

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    Duan K, Li Y J, Li L, Hu Y J, Wang X L 2018 Mater. Des. 147 11Google Scholar

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    Jiang H, Cheng X L 2018 J. Mol. Graphics Modell. 85 223Google Scholar

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    张忠强, 李冲, 刘汉伦, 葛道晗, 程广贵, 丁建宁 2018 物理学报 67 056102Google Scholar

    Zhang Z Q, Li C, Liu H L, Ge D J, Cheng G G, Ding J N 2018 Acta Phys. Sin. 67 056102Google Scholar

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    Plimpton S 1995 J. Comput. Phys. 117 1Google Scholar

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    Hummer G, Rasaiah J C, Noworyta J P 2001 Nature 414 188Google Scholar

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    Joung I S, Cheatham T E 2008 J. Phys. Chem. B 112 9020Google Scholar

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    Stuart S J, Tutein A B, Harrison J A 2000 J. Chem. Phys. 112 6472Google Scholar

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    Chen B, Ivanov I, Klein M L, Parrinello M 2003 Phys. Rev. Lett. 91 215503Google Scholar

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    Zhang Z Q, Yu F S, Liu Z, Zhang F J, Cheng G G 2020 Acta Phys. Sin. 69 098201Google Scholar

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    Xie M, Gray S R 2016 Sep. Purif. Technol. 167 6Google Scholar

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    Li T G, Tu Q S, Li S F 2019 Desalination 451 182Google Scholar

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    Tu Q S, Li T G, Deng A, Zhu K, Liu Y F, Li S F 2018 Technology 6 36Google Scholar

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    Zhang Z Q, Li S F, Mi B X, Wang J B, Ding J N 2020 Sci. Adv. 6 eaba9471Google Scholar

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    Thomas M, Corry B, Hilder T A 2014 Small 10 1453Google Scholar

  • 图 1  (a) 压力驱动作用下以柱状石墨烯为反渗透膜的反渗透分子动力学模型图(其中灰色球为反渗透膜中的碳原子, 中间的红色、白色、蓝色、黄色球分别代表盐水中的氧原子、氢原子、钠离子、氯离子, 左边棕色球是用来提供驱动压力的单层石墨烯, 右侧棕色球是单层石墨烯挡板); (b)两个1.2 nm 孔径的RO膜

    Fig. 1.  (a) Molecular dynamics model for pressure-driven reverse osmosis by a pillared graphene. The dark gray particles are carbon atoms of grapheme. The red, white, blue, and yellow spheres represent the oxygen atoms, hydrogen atoms, sodium ions, and chloride ions in the brine, respectively. The monolayer graphene at the left side is used to provide driving pressure, while the one at the right side is rigid boundary to confine the solvent. (b) RO membrane with two pores (diameter of 1.2 nm).

    图 2  不同孔径的柱状石墨烯膜水通量与施加压强的关系

    Fig. 2.  Relationship between water flux and applied pressure for a pillared graphene membrane with different pore sizes.

    图 3  无剪切作用时, 孔径为1.2 nm的柱状石墨烯膜在不同压强和温度下的盐离子截留率与水分子渗透率 (a) 温度为298 K时, 不同压强下的盐离子截留率和水分子渗透率; (b) 压强为200 MPa时, 不同温度下的盐离子截留率和水分子渗透率

    Fig. 3.  Without shearing, salt rejection verses water molecules permeability for the pillared graphene with pore diameter of 1.2 nm under different pressure and temperature: (a) Salt rejection and water permeation rate for the RO membrane under different pressure with the temperature of 298 K; (b) salt rejection and water permeation rate for the RO membrane under different temperature with the pressure of 200 MPa.

    图 4  压强为200 MPa和温度为298 K时, 不同剪切速度下孔径为1.2 nm的柱状石墨烯膜透反渗透特性 (a) 透过柱状石墨烯膜的水分子数随时间的变化; (b) 柱状石墨烯膜在不同剪切速度下的盐离子截留率

    Fig. 4.  With the pressure of 200 MPa and the temperature of 298 K, reverse osmosis properties of the pillared graphene with pore diameter of 1.2 nm under different shearing speed: (a) The number of water molecules passing through the pillared graphene membrane over time; (b) salt rejection of the pillared graphene membrane under different shearing speed.

    图 5  在压强为200 MPa时, 不同剪切速度和温度下进给区每个水分子的平均氢键数和端口区每个水分子的平均氢键数 (a) 在不同剪切速度下(温度为298 K); (b) 在不同温度下(剪切速度为0)

    Fig. 5.  With the pressure of 200 MPa, the average number of hydrogen bonds (HB) per water molecule in the feed and port region under different shearing speed and temperature: (a) Under different shearing speed (with the temperature of 298 K); (b) under different temperature (without shearing).

    图 6  在压强为200 MPa时, 不同剪切速度和温度下氢键自相关函数C(t) (a) 在不同剪切速度下(温度为298 K); (b) 在不同温度下(剪切速度为0)

    Fig. 6.  With the pressure of 200 MPa, the hydrogen bond autocorrelation function C(t) under different shearing speed and temperature: (a) Under different shearing speed (with the temperature of 298 K); (b) under different temperature (without shearing).

    图 7  柱状石墨烯纳米孔内水分子和离子的x-y平面数量密度分布 (a) 水分子在纳米孔内; (b) 离子在纳米孔内

    Fig. 7.  x-y planar number density distribution of water molecules and ions in pillared graphene nanopores: (a) Water molecules in the nanopores; (b) ions in the nanopores.

    图 8  水合壳模型图 (粉色的球代表第一水合壳中的氧原子, 红色的球代表第二水合层中的氧原子, 白色和紫色的球分别代表氢原子和钠离子) (a) 在进给区中; (b) 在柱状石墨烯纳米通道内

    Fig. 8.  Models of hydration shell: (a) In the feed region; (b) in pillared graphene nanochannels. The pink spheres represent the oxygen atoms in the first hydration shell. The red spheres represent the oxygen atoms in the second hydration shell. The white and purple spheres represent the hydrogen atoms andsodium ions, respectively.

    图 9  在不同条件下Na+第一与第二水合壳中水分子数分布 (a) 在不同剪切速度下Na+第一水合壳中水分子数分布; (b) 在不同温度下Na+第一水合壳中水分子数分布; (c) 在不同剪切速度下Na+第二水合壳中水分子数分布; (d) 在不同温度下Na+第二水合壳中水分子数分布

    Fig. 9.  Hydration number distribution of Na+ in the first and second hydration shell under different conditions: (a) Hydration number distribution of Na+ in the first hydration shell at different shearing speed; (b) hydration number distribution of Na+ in the first hydration shell at different temperature; (c) hydration number distribution of Na+ in the second hydration shell at different shearing speed; (d) hydration number distribution of Na+ in the second hydration shell at different temperature.

    图 10  在不同条件下Na+第一与第二水合壳中每个水分子平均氢键数 (a) 在不同剪切速度下; (b) 在不同温度下

    Fig. 10.  Average number of hydrogen bonds (HB) per water molecule in Na+ first and second hydration shell under different conditions: (a) Under different shearing speed; (b) under different temperature.

    表 1  LJ势能参数

    Table 1.  LJ potential parameters.

    ElementsC (sp2)OwHwNa+Cl
    ε/(kcal·mol–1)0.08590.1627500.16840.0117
    σ3.39973.1643502.25895.1645
    q/e0–1.04840.52421–1
    下载: 导出CSV
  • [1]

    Elimelech M, Phillip W A 2011 Science 333 712Google Scholar

    [2]

    Park H B, Kamcev J, Robeson L M, Elimelech M, Freeman B D 2017 Science 356 1137Google Scholar

    [3]

    Lee K P, Arnot T C, Mattia D 2011 J. Membrane Sci. 370 1Google Scholar

    [4]

    Sint K, Wang B Y, Kral P 2008 J. Am. Chem. Soc. 130 16448Google Scholar

    [5]

    Cohen-Tanugi D, Grossman J C 2012 Nano Lett. 12 3602Google Scholar

    [6]

    Cohen-Tanugi D, Lin L C, Grossman J C 2016 Nano Lett. 16 1027Google Scholar

    [7]

    Cohen-Tanugi D, Grossman J C 2014 J. Chem. Phys. 141 074704Google Scholar

    [8]

    Zhang Z Q, Zhang F J, Liu Z, Cheng G G, Wang X D, Ding J N 2018 Nanomaterials (Basel) 8 805Google Scholar

    [9]

    Ali M E A, Wang L Y, Wang X Y, Feng X S 2016 Desalination 386 67Google Scholar

    [10]

    Hosseini M, Azamat J, Erfan-Niya H 2018 Appl. Surf. Sci. 427 1000Google Scholar

    [11]

    Jafarzadeh R, Azamat J, Erfan-Niya H 2018 Struct. Chem. 29 1845Google Scholar

    [12]

    Wang Y H, He Z J, Gupta K M, Shi Q, Lu R F 2017 Carbon 116 120Google Scholar

    [13]

    Surwade S P, Smirnov S N, Vlassiouk I V, Unocic R R, Veith G M, Sheng Dai S, Mahurin S M 2015 Nat. Nanotechnol. 10 459Google Scholar

    [14]

    Song L B, Guo Z G, Chai G B, Wang Z H, Li Y G, Luan Y B 2018 Carbon 140 210Google Scholar

    [15]

    Sakhavand N, Shahsavari R 2017 ACS Appl. Mater. Interfaces 9 39122Google Scholar

    [16]

    Wu C D, Fang T H, Lo J Y 2012 Int. J. Hydrogen Energy 37 14211Google Scholar

    [17]

    Lü R, Cruz-Silva E, Terrones M 2014 ACS Nano 8 4061Google Scholar

    [18]

    Wang Y C, Zhu Y B, Wang F C, Liu X Y, Wu H A 2017 Carbon 118 588Google Scholar

    [19]

    Duan K, Li Y J, Li L, Hu Y J, Wang X L 2018 Mater. Des. 147 11Google Scholar

    [20]

    Jiang H, Cheng X L 2018 J. Mol. Graphics Modell. 85 223Google Scholar

    [21]

    Hassani A, Mosavian M T H, Ahmadpour A, Farhadian N 2017 J. Nat. Gas Sci. Eng. 46 265Google Scholar

    [22]

    Zhou S N, Lu X Q, Wu Z H, Jin D L, Guo C, Wang M H, Wei S X 2016 Chem. Phys. Lett. 660 272Google Scholar

    [23]

    Wesolowski R P, Terzyk A P 2011 Phys. Chem. Chem. Phys. 13 17027Google Scholar

    [24]

    Tofighy M A, Shirazi Y, Mohammadi T, Pak A 2011 Chem. Eng. J. 168 1064Google Scholar

    [25]

    Corry B 2008 J. Phys. Chem. B 112 1427Google Scholar

    [26]

    张忠强, 李冲, 刘汉伦, 葛道晗, 程广贵, 丁建宁 2018 物理学报 67 056102Google Scholar

    Zhang Z Q, Li C, Liu H L, Ge D J, Cheng G G, Ding J N 2018 Acta Phys. Sin. 67 056102Google Scholar

    [27]

    Plimpton S 1995 J. Comput. Phys. 117 1Google Scholar

    [28]

    Hummer G, Rasaiah J C, Noworyta J P 2001 Nature 414 188Google Scholar

    [29]

    Joung I S, Cheatham T E 2008 J. Phys. Chem. B 112 9020Google Scholar

    [30]

    Stuart S J, Tutein A B, Harrison J A 2000 J. Chem. Phys. 112 6472Google Scholar

    [31]

    Horn H W, Swope W C, Pitera J W, Madura J D, Dick T J, Hura G L, Head-Gordon T 2004 J. Chem. Phys. 120 9665Google Scholar

    [32]

    Chen B, Ivanov I, Klein M L, Parrinello M 2003 Phys. Rev. Lett. 91 215503Google Scholar

    [33]

    Todorova T, Seitsonen A P, Hutter J, Kuo I F, Mundy C J 2006 J. Phys. Chem. B 110 3685Google Scholar

    [34]

    张忠强, 于凡顺, 刘珍, 张福建, 程广贵 2020 物理学报 69 098201Google Scholar

    Zhang Z Q, Yu F S, Liu Z, Zhang F J, Cheng G G 2020 Acta Phys. Sin. 69 098201Google Scholar

    [35]

    Xu H, Berne B J 2001 J. Phys. Chem. B 105 11929Google Scholar

    [36]

    Xie M, Gray S R 2016 Sep. Purif. Technol. 167 6Google Scholar

    [37]

    Li T G, Tu Q S, Li S F 2019 Desalination 451 182Google Scholar

    [38]

    Tu Q S, Li T G, Deng A, Zhu K, Liu Y F, Li S F 2018 Technology 6 36Google Scholar

    [39]

    Zhang Z Q, Li S F, Mi B X, Wang J B, Ding J N 2020 Sci. Adv. 6 eaba9471Google Scholar

    [40]

    Thomas M, Corry B, Hilder T A 2014 Small 10 1453Google Scholar

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出版历程
  • 收稿日期:  2020-10-23
  • 修回日期:  2020-12-03
  • 上网日期:  2021-04-15
  • 刊出日期:  2021-05-05

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