References
   -  C. Wei, X. Li, Z. Deng, G. Fan, M. Li, C. Li, Recovery of H2SO4
    from an acid leach solution by diffusion dialysis, J. Hazard.
    Mater., 176 (2010) 226–230. 
 
  -  A. Agrawal, K.K. Sahu, An overview of the recovery of acid
    from spent acidic solutions from steel and electroplating
    industries, J. Hazard. Mater., 171 (2009) 61–75. 
 
  -  T. Xu, W. Yang, Industrial recovery of mixed acid (HF+HNO3)
    from the titanium spent leaching solutions by diffusion
    dialysis with a new series of anion exchange membranes,
    J. Membr. Sci., 220 (2003) 89–95. 
 
  -  J. Luo, C. Wu, T. Xu, Y. Wu, Diffusion dialysis-concept,
    principle and applications, J. Membr. Sci., 366 (2011) 1–16. 
 
  -  C.-H. Shin, J.-Y. Kim, J.-Y. Kim, H.-S. Kim, H.-S. Lee,
    D. Mohapatra, J.-W. Ahn, J.-G. Ahn, W. Bae, Recovery of nitric
    acid from waste etching solution using solvent extraction,
    J. Hazard. Mater., 163 (2009) 729–734. 
 
  -  J. Xu, S. Lu, D. Fu, Recovery of hydrochloric acid from the
    waste acid solution by diffusion dialysis, J. Hazard. Mater.,
    165 (2009) 832–837. 
 
  -  N.U. Afsar, B. Erigene, M. Irfan, B. Wu, T. Xu, W. Ji, K. Emmanuel,
    L. Ge, T. Xu, High performance anion exchange membrane
    with proton transport pathways for diffusion dialysis, Sep.
    Purif. Technol., 193 (2018) 11–20. 
 
  -  J.R. Varcoe, P. Atanassov, D.R. Dekel, A.M. Herring,
    M.A. Hickner, P.A. Kohl, A.R. Kucernak, W.E. Mustain,
    K. Nijmeijer, K. Scott, Anion-exchange membranes in electrochemical
    energy systems, Energy Environ. Sci., 7 (2014) 3135–3191. 
 
  -  J. Ran, L. Wu, Y. Ru, M. Hu, L. Din, T. Xu, Anion exchange
    membranes (AEMs) based on poly(2,6-dimethyl-1,4-phenylene
    oxide) (PPO) and its derivatives, Polym. Chem., 6 (2015)
    5809–5826. 
 
  -  M.I. Khan, M. Khraisheh, F. Almomani, Fabrication and
    characterization of pyridinium functionalized anion exchange
    membranes for acid recovery, Sci. Total Environ., 686 (2019)
    90–96. 
 
  -  M.I. Khan, Comparison of different quaternary ammonium
    groups on desalination performance of BPPO-based anion
    exchange membranes, Desal. Water Treat., 108 (2018) 49–57. 
 
  -  M.I. Khan, M. Khraisheh, Synthesis and characterization of
    stable anion exchange membranes for desalination applications,
    Desal. Water Treat., 113 (2018) 36–44. 
 
  -  N. Li, M.D. Guiver, Ion transport by nanochannels in ioncontaining
    aromatic copolymers, Macromolecules, 47 (2014)
    2175–2198. 
 
  -  N. Li, Q. Zhang, C. Wang, Y.M. Lee, M.D. Guiver,
    Phenyltrimethylammonium functionalized polysulfone anion
    exchange membranes, Macromolecules, 45 (2012) 2411–2419. 
 
  -  J.R. Varcoe, R.C.T. Slade, E. Lam How Yee, S.D. Poynton,
    D.J. Driscoll, D.C. Apperley, Poly(ethylene-co-tetrafluoroethylene)-derived radiation-grafted anion-exchange
    membrane with properties specifically tailored for application
    in metal-cation-free alkaline polymer electrolyte fuel cells,
    Chem. Mater., 19 (2007) 2686–2693. 
 
  -  K. Emmanuel, C. Cheng, B. Erigene, A.N. Mondal,
    M.M. Hossain, M.I. Khan, N.U. Afsar, G. Liang, L. Wu,
    T. Xu, Imidazolium functionalized anion exchange membrane
    blended with PVA for acid recovery via diffusion dialysis
    process, J. Membr. Sci., 497 (2016) 209–215. 
 
  -  F. Song, Y. Fu, Y. Gao, J. Li, J. Qiao, X.-D. Zhou, Y. Liu,
    Novel alkaline anion-exchange membranes based on
    chitosan/ethenylmethylimidazoliumchloride polymer with
    ethenylpyrrolidone composites for low temperature polymer
    electrolyte fuel cells, Electrochim. Acta, 177 (2015) 137–144. 
 
  -  N. Chen, H. Zhu, Y. Chu, R. Li, Y. Liu, F. Wang, Cobaltoceniumcontaining
    polybenzimidazole polymers for alkaline anion
    exchange membrane applications, Polym. Chem., 8 (2017)
    1381–1392. 
 
  -  M.I. Khan, R. Luque, P. Prinsen, A. Rehman, S. Anjum,
    M. Nawaz, A. Shaheen, S. Zafar, M. Mustaqeem, BPPO-based
    anion exchange membranes for acid recovery via diffusion
    dialysis, Materials, 10 (2017) 1–11, doi: 10.3390/ma10030266. 
 
  -  M.I. Khan, R. Luque, S. Akhtar, A. Shaheen, A. Mehmood,
    S. Idress, S. Buzdar, A. Rehman, Design of anion exchange
    membranes and electrodialysis studies for water desalination,
    Materials, 9 (2016) 1–14, doi: 10.3390/ma9050365. 
 
  -  M.I. Khan, A.N. Mondal, B. Tong, C. Jiang, K. Emmanuel,
    Z. Yang, L. Wu, T. Xu, Development of BPPO-based anion
    exchange membranes for electrodialysis desalination
    applications, Desalination, 391 (2016) 61–68. 
 
  -  J. Zhou, M. Unlu, J.A. Vega, P.A. Kohl, Anionic polysulfone
    ionomers and membranes containing fluorenyl groups for
    anionic fuel cells, J. Power Sources, 190 (2009) 285–292. 
 
  -  T. Xu, D. Wu, L. Wu, Poly(2,6-dimethyl-1,4-phenylene oxide)
    (PPO)—a versatile starting polymer for proton conductive
    membranes (PCMs), Prog. Polym. Sci., 33 (2008) 894–915. 
 
  -  E. Shamsaei, Z.-X. Low, X. Lin, A. Mayahi, H. Liu, X. Zhang,
    J. Zhe Liu, H. Wang, Rapid synthesis of ultrathin, defectfree
    ZIF-8 membranes via chemical vapour modification of a
    polymeric support, Chem. Commun., 51 (2015) 11474–11477. 
 
  -  Q. Zhang, S. Li, S. Zhang, A novel guanidinium grafted
    poly(aryl ether sulfone) for high-performance hydroxide
    exchange membranes, Chem. Commun., 46 (2010) 7495–7497. 
 
  -  J. Wang, S. Li, S. Zhang, Novel hydroxide-conducting
    polyelectrolyte composed of an poly(arylene ether sulfone)
    containing pendant quaternary guanidinium groups for
    alkaline fuel cell applications, Macromolecules, 43 (2010)
    3890–3896. 
 
  -  L. Liu, Q. Li, J. Dai, H. Wang, B. Jin, R. Bai, A facile strategy
    for the synthesis of guanidinium-functionalized polymer as
    alkaline anion exchange membrane with improved alkaline
    stability, J. Membr. Sci., 453 (2014) 52–60. 
 
  -  C. Qu, H. Zhang, F. Zhang, B. Liu, A high-performance anion
    exchange membrane based on bi-guanidinium bridged
    polysilsesquioxane for alkaline fuel cell application, J. Mater.
    Chem., 22 (2012) 8203–8207. 
 
  -  B. Zhang, S. Gu, J. Wang, Y. Liu, A.M. Herring, Y. Yan, Tertiary
    sulfonium as a cationic functional group for hydroxide
    exchange membranes, RSC Adv., 2 (2012) 12683–12685. 
 
  -  S. Gu, R. Cai, T. Luo, Z. Chen, M. Sun, Y. Liu, G. He, Y. Yan,
    A soluble and highly conductive ionomer for high-performance
    hydroxide exchange membrane fuel cells, Angew. Chem.
    Int. Ed., 48 (2009) 6499–6502. 
 
  -  S. Gu, R. Cai, Y. Yan, Self-crosslinking for dimensionally
    stable and solvent-resistant quaternary phosphonium based
    hydroxide exchange membranes, Chem. Commun., 47 (2011)
    2856–2858. 
 
  -  S. Gu, J. Skovgard, Y.S. Yan, Engineering the Van der
    Waals interaction in cross-linking-free hydroxide exchange
    membranes for low swelling and high conductivity,
    ChemSusChem, 5 (2012) 843–848. 
 
  -  L. Jiang, X. Lin, J. Ran, C. Li, L. Wu, T. Xu, Synthesis and
    properties of quaternary phosphonium-based anion exchange
    membrane for fuel cells, Chin. J. Chem., 30 (2012) 2241–2246. 
 
  -  K.J. Noonan, K.M. Hugar, H.A. Kostalik IV, E.B. Lobkovsky,
    H.D. Abruña, G.W. Coates, Phosphonium-functionalized
    polyethylene: a new class of base-stable alkaline anion exchange
    membranes, J. Am. Chem. Soc., 134 (2012) 18161–18164. 
 
  -  N. Li, T. Yan, Z. Li, T. Thurn-Albrecht, W.H. Binder, Combshaped
    polymers to enhance hydroxide transport in anion
    exchange membranes, Energy Environ. Sci., 5 (2012) 7888–7892. 
 
  -  M.I. Khan, C. Zheng, A.N. Mondal, M.M. Hossain, B. Wu,
    K. Emmanuel, L. Wu, T. Xu, Preparation of anion exchange
    membranes from BPPO and dimethylethanolamine for
    electrodialysis, Desalination, 402 (2017) 10–18. 
 
  -  M.I. Khan, A.N. Mondal, K. Emmanuel, M.M. Hossain,
    N.U. Afsar, L. Wu, T. Xu, Preparation of pyrrolidinium-based
    anion-exchange membranes for acid recovery via diffusion
    dialysis, Sep. Sci. Technol., 51 (2016) 1881–1890. 
 
  -  M.I. Khan, L. Wu, M.M. Hossain, J. Pan, J. Ran, A.N. Mondal,
    T. Xu, Preparation of diffusion dialysis membrane for acid
    recovery via a phase-inversion method, Membr. Water Treat.,
    6 (2015) 365–378. 
 
  -  M.I. Khan, A.N. Modal, C. Cheng, J. Pan, K. Emmanuel, L. Wu,
    T. Xu, Porous BPPO-based membranes modified by aromatic
    amine for acid recovery, Sep. Purif. Technol., 157 (2016) 27–34. 
 
  -  T. Xu, W. Yang, Fundamental studies of a new series of
    anion exchange membranes: membrane preparation and
    characterization, J. Membr. Sci., 190 (2001) 159–166. 
 
  -  C. Wu, Y. Wu, J. Luo, T. Xu, Y. Fu, Anion exchange hybrid
    membranes from PVA and multi-alkoxy silicon copolymer
    tailored for diffusion dialysis process, J. Membr. Sci., 356 (2010)
    96–104. 
 
  -  C. Wu, Y. Wu, M. Gong, T. Xu, New anion exchanger organic–
    inorganic hybrids and membranes from a copolymer of
    glycidylmethacrylate and -methacryloxypropyl trimethoxy
    silane, J. Appl. Polym. Sci., 102 (2006) 3580–3589. 
 
  -  Y. Li, T. Xu, M. Gong, Fundamental studies of a new series
    of anion exchange membranes: membranes prepared from
    bromomethylated poly(2,6-dimethyl-1,4-phenylene oxide)
    (BPPO) and pyridine, J. Membr. Sci., 279 (2006) 200–208. 
 
  -  C.G. Arges, L. Wang, M.-s. Jung, V. Ramani, Mechanically stable
    poly(arylene ether) anion exchange membranes prepared from
    commercially available polymers for alkaline electrochemical
    devices, J. Electrochem. Soc., 162 (2015) F686–F693. 
 
  -  M.M. Hossain, L. Wu, X. Liang, Z. Yang, J. Hou, T. Xu, Anion
    exchange membrane crosslinked in the easiest way stands out
    for fuel cells, J. Power Sources, 390 (2018) 234–241. 
 
  -  A.N. Mondal, C. Cheng, Z. Yao, J. Pan, M.M. Hossain,
    M.I. Khan, Z. Yang, L. Wu, T. Xu, Novel quaternized aromatic
    amine based hybrid PVA membranes for acid recovery,
    J. Membr. Sci., 490 (2015) 29–37. 
 
  -  A.N. Mondal, C. Cheng, M.I. Khan, M.M. Hossain, K. Emmanuel,
    L. Ge, B. Wu, Y. He, J. Ran, X. Ge, N.U. Afsar, L. Wu, T. Xu,
    Improved acid recovery performance by novel poly(DMAEMco-
    γ-MPS) anion exchange membrane via diffusion dialysis,
    J. Membr. Sci., 525 (2017) 163–174. 
 
  -  C. Cheng, Z. Yang, J. Pan, B. Tong, T. Xu, Facile and cost effective
    PVA based hybrid membrane fabrication for acid recovery,
    Sep. Purif. Technol., 136 (2014) 250–257. 
 
  -  C. Wang, C. Wu, Y. Wu, J. Gu, T. Xu, Polyelectrolyte complex/
    PVA membranes for diffusion dialysis, J. Hazard. Mater.,
    261 (2013) 114–122. 
 
  -  Y. He, J. Pan, L. Wu, L. Ge, T. Xu, Facile preparation of
    1,8-diazabicyclo[5.4.0]undec-7-ene based high performance
    anion exchange membranes for diffusion dialysis applications,
    J. Membr. Sci., 491 (2015) 45–52. 
 
  -  J. Feng, J. Chen, B. Wei, S. Liao, Y. Yu, X. Li, Series-connected
    hexacations cross-linked anion exchange membranes for
    diffusion dialysis in acid recovery, J. Membr. Sci., 570–571 (2019)
    120–129. 
 
  -  C. Cheng, Z. Yang, Y. He, A.N. Mondal, E. Bakangura, T. Xu,
    Diffusion dialysis membranes with semi-interpenetrating
    network for acid recovery, J. Membr. Sci., 493 (2015) 645–653. 
 
  -  J. Luo, C. Wu, Y. Wu, T. Xu, Diffusion dialysis of hydrochloride
    acid at different temperatures using PPO–SiO2 hybrid anion
    exchange membranes, J. Membr. Sci., 347 (2010) 240–249. 
 
  -  X. Lin, E. Shamsaei, B. Kong, J.Z. Liu, T. Xu, H. Wang,
    Fabrication of asymmetrical diffusion dialysis membranes for
    rapid acid recovery with high purity, J. Mater. Chem. A, 3 (2015)
    24000–24007. 
 
  -  Y. Wu, C. Wu, Y. Li, T. Xu, Y. Fu, PVA–silica anion-exchange
    hybrid membranes prepared through a copolymer crosslinking
    agent, J. Membr. Sci., 350 (2010) 322–332. 
 
  -  Y. Wu, J. Luo, C. Wu, T. Xu, Y. Fu, Bionic multisilicon copolymers
    used as novel cross-linking agents for preparing anion exchange
    hybrid membranes, J. Phys. Chem. B, 115 (2011) 6474–6483.