References
   -  Silver in Water Purification, The Silver Institute. Available
    at: https://www.silverinstitute.org/silver-water-purification/
    (accessed June 22, 2019) 
 
  -  Environmental Impact of Silver Nanoparticles, Wikipedia,
    2018, Available at: https://en.wikipedia.org/w/index.php?title=Environmental_impact_of_silver_nanoparticles&oldid=
    845979434 (accessed June 22, 2019) 
 
  -  S.J. Lee, D.N. Heo, M. Heo, M.H. Noh, D. Lee, S.A. Park,
    J.-H. Moon, I.K. Kwon, Most simple preparation of an inkjet
    printing of silver nanoparticles on fibrous membrane for water
    purification: technological and commercial application, J. Ind.
    Eng. Chem., 46 (2017) 273–278. 
 
  -  D.J. Barillo, D.E. Marx, Silver in medicine: a brief history BC 335
    to present, Burns, 40 (2014) S3–S8. 
 
  -  J. Goel, K. Kadirvelu, C. Rajagopal, Mercury(II) removal from
    water by coconut shell based activated carbon: batch and
    column studies, Environ. Technol., 25 (2004) 141–153. 
 
  -  N. Ali, M. Ismail, A. Khan, H. Khan, S. Haider, T. Kamal,
    Spectrophotometric methods for the determination of urea in
    real samples using silver nanoparticles by standard addition
    and 2nd order derivative methods, Spectrochim. Acta, Part A,
    189 (2018) 110–115. 
 
  -  T. Kamal, N. Ali, A.A. Naseem, S.B. Khan, A.M. Asiri, Polymer
    nanocomposite membranes for antifouling nanofiltration,
    Recent Pat. Nanotechnol., 10 (2016) 189–201. 
 
  -  F. Wahid, I.U. Mohammadzai, A. Khan, Z. Shah, W. Hassan,
    N. Ali, Removal of toxic metals with activated carbon
    prepared from Salvadora persica, Arabian J. Chem., 10 (2017)
    S2205–S2212. 
 
  -  A. Khan, S. Begum, N. Ali, S. Khan, S. Hussain, M.D.P.T.
    Sotomayor,
    Preparation of crosslinked chitosan magnetic
    membrane for cations sorption from aqueous solution, Water
    Sci. Technol., 75 (2017) 2034–2046. 
 
  -  N. Ali, A. Zada, M. Zahid, A. Ismail, M. Rafiq, A. Riaz, A. Khan,
    Enhanced photodegradation of methylene blue with alkaline
    and transition-metal ferrite nanophotocatalysts under direct
    sun light irradiation, J. Chin. Chem. Soc., 66 (2019) 402–408. 
 
  -  X.H. Lu, Q.X. Chen, D. Zhao, J.J. Zhu, J.B. Ji, Silver-based ionic
    liquid as separation media: supported liquid membrane for
    facilitated methyl linolenate transport, J. Membr. Sci., 585 (2019)
    218–229. 
 
  -  N. Ali, S. Azeem, A. Khan, H. Khan, T. Kamal, A.M. Asiri,
    Experimental studies on removal of arsenites from industrial
    effluents using tridodecylamine supported liquid membrane,
    Environ. Sci. Pollut. Res., 27 (2020) 11932–11943. 
 
  -  S. Pedersen-Bjergaard, K.E. Rasmussen, Electrokinetic
    migration across artificial liquid membranes: new concept for
    rapid sample preparation of biological fluids, J. Chromatogr. A,
    1109 (2006) 183–190. 
 
  -  R. Nawaz, K. Ali, M. Arshad, Recovery of mercury using a
    trioctylphosphine oxide-based supported liquid membrane
    system, Environ. Eng. Sci., 32 (2015) 948–959. 
 
  -  R. Nawaz, K. Ali, M. Khan, Extraction of copper from wastewater
    through supported liquid membrane using tri-ethanolamine as
    a carrier, Desal. Water Treat., 57 (2016) 21827–21841. 
 
  -  R. Nawaz, K. Ali, N. Ali, A. Khaliq, Removal of chromium(VI)
    from industrial effluents through supported liquid membrane
    using trioctylphosphine oxide as a carrier, J. Braz. Chem. Soc.,
    27 (2016) 209–220. 
 
  -  S. Pedersen-Bjergaard, C. Huang, A. Gjelstad, Electromembrane
    extraction–recent trends and where to go, J. Pharm. Anal.,
    7 (2017) 141–147. 
 
  -  S. Pedersen-Bjergaard, Electromembrane extraction—looking
    into the future, Anal. Bioanal. Chem., 411 (2019) 1687–1693. 
 
  -  C.-S. Yeh, P.-S. Cheng, S.Y. Chang, Solvent-free electromembrane
    extraction: a new concept in electro-driven extraction, Talanta,
    199 (2019) 296–302. 
 
  -  M.A. Barakat, New trends in removing heavy metals from
    industrial wastewater, Arabian J. Chem., 4 (2011) 361–377. 
 
  -  N. Ali, N. Naz, Z. Shah, A. ul Haq Ali Shah, A. Khan, R. Nawaz,
    Selective transportation of molybdenum from model and ore
    through poly inclusion membrane, Bull. Chem. Soc. Ethiop.,
    34 (2020) 93–104. 
 
  -  M.S. Alam, K. Inoue, K. Yoshizuka, Y. Dong, P. Zhang, Solvent
    extraction of silver from chloride media with some commercial
    sulfur-containing extractants, Hydrometallurgy, 44 (1997)
    245–254. 
 
  -  K. Ohto, E. Murakami, T. Shinohara, K. Shiratsuchi, K. Inoue,
    M. Iwasaki, Selective extraction of silver(I) over palladium(II)
    with ketonic derivatives of calixarenes from highly concentrated
    nitric acid, Anal. Chim. Acta, 341 (1997) 275–283. 
 
  -  M. Oue, K. Kimura, T. Shono, Liquid-liquid extraction of silver
    ion with benzothiacrown ether derivatives, Anal. Chim. Acta,
    194 (1987) 293–298. 
 
  -  M. Shamsipur, S.Y. Kazemi, G. Azimi, S.S. Madaeni, V. Lippolis,
    A. Garau, F. Isaia, Selective transport of silver ion through a
    supported liquid membrane using some mixed aza-thioether
    crowns containing a 1,10-phenanthroline sub-unit as specific
    ion carriers, J. Membr. Sci., 215 (2003) 87–93. 
 
  -  S. Altin, Y. Yildirim, A. Altin, Transport of silver ions through
    a flat-sheet supported liquid membrane, Hydrometallurgy,
    103 (2010) 144–149. 
 
  -  O. Arous, H. Kerdjoudj, P. Seta, Comparison of carrierfacilitated
    silver(I) and copper(II) ions transport mechanisms
    in a supported liquid membrane and in a plasticized cellulose
    triacetate membrane, J. Membr. Sci., 241 (2004) 177–185. 
 
  -  S.K. Ashok Kumar, Shipra, Manjusha, Dual behavior of thiuram
    sulfide: highly selective transport and ion-selective electrode
    for Ag(I) ions under two different conditions, J. Membr. Sci.,
    350 (2010) 161–171. 
 
  -  B. Tang, G.J. Yu, J.Z. Fang, T.H. Shi, Recovery of high-purity
    silver directly from dilute effluents by an emulsion liquid
    membrane-crystallization process, J. Hazard. Mater., 177 (2010)
    377–383. 
 
  -  M. Ramos-Payán, R. Fernández-Torres, J.L. Pérez-Bernal,
    M. Callejón-Mochón, M.Á. Bello-López, A novel approach
    for electromembrane extraction based on the use of silver
    nanometallic-decorated hollow fibers, Anal. Chim. Acta, 849
    (2014) 7–11. 
 
  -  A.A. Amiri, A. Safavi, A.R. Hasaninejad, H. Shrghi,
    M. Shamsipur, Highly selective transport of silver ion through
    a supported liquid membrane using calix
 
  - pyrroles as suitable
    ion carriers, J. Membr. Sci., 325 (2008) 295–300. 
 
  -  M.A. Chaudry, N. Bukhari, M. Mazhar, Coupled transport of
    Ag(I) ions through triethanolamine–cyclohexanone-based
    supported liquid membranes, J. Membr. Sci., 320 (2008)
    93–100. 
 
  -  S. ur Rehman, G. Akhtar, M.A. Chaudry, K. Ali, N. Ullah,
    Transport of Ag+ through tri-n-dodecylamine supported liquid
    membranes, J. Membr. Sci., 389 (2012) 287–293. 
 
  -  T. Kamal, I. Ahmad, S.B. Khan, A.M. Asiri, Agar hydrogel
    supported metal nanoparticles catalyst for pollutants
    degradation in water, Desal. Water Treat., 136 (2018) 290–298. 
 
  -  T. Kamal, M. Ul-Islam, S.B. Khan, A.M. Asiri, Adsorption
    and photocatalyst assisted dye removal and bactericidal
    performance of ZnO/chitosan coating layer, Int. J. Biol.
    Macromol., 81 (2015) 584–590. 
 
  -  F. Ali, S.B. Khan, T. Kamal, Y. Anwar, K.A. Alamry, A.M. Asiri,
    Anti-bacterial chitosan/zinc phthalocyanine fibers supported
    metallic and bimetallic nanoparticles for the removal of organic
    pollutants, Carbohydr. Polym., 173 (2017) 676–689. 
 
  -  N. Ali, Awais, T. Kamal, M. Ul-Islam, A. Khan, S.J. Shah,
    A. Zada, Chitosan-coated cotton cloth supported copper
    nanoparticles for toxic dye reduction, Int. J. Biol. Macromol.,
    111 (2018) 832–838. 
 
  -  T. Kamal, S.B. Khan, A.M. Asiri, Synthesis of zero-valent
    Cu nanoparticles in the chitosan coating layer on cellulose
    microfibers: evaluation of azo dyes catalytic reduction,
    Cellulose, 23 (2016) 1911–1923. 
 
  -  G. Svehla, B. Sivasankar, Vogel’s Qualitative Inorganic Analysis,
    7th ed., Pearson Education, India, 2008. 
 
  -  H. Ur Rehman, G. Akhtar, H. Ur Rashid, N. Ali, I. Ahmad,
    S. Ur Rehman, K. Khan, M. Arshad, Transport of Zn(II) by TDDApolypropylene
    supported liquid membranes and recovery
    from waste discharge liquor of galvanizing plant of Zn(II),
    J. Chem., 2017 (2017) 1–9, https://doi.org/10.1155/2017/7569354. 
 
  -  N. Othman, K.H. Chan, M. Goto, H. Mat, Emulsion liquid
    membrane extraction of silver from photographic waste using
    CYANEX 302 as the mobile carrier, Solvent Extr. Res. Dev.,
    13 (2006) 191–202. 
 
  -  N. Othman, H. Mat, M. Goto, Selective extraction of silver from
    liquid photographic waste, Solvent Extr. Res. Dev., 12 (2005)
    27–34.