1. L.L. Hench, Biomaterials: a forecast for the future, Biomaterials, 19 (1998) 1419–1423.
  2. F.-C. Wu, R.-L. Tseng, R.-S. Juang, A review and experimental verification of using chitosan and its derivatives as adsorbents for selected heavy metals, J. Environ. Manage., 91 (2010) 798–806.
  3. M. Jaishankar, T. Tseten, N. Anbalagan, B.B. Mathew, K.N. Beeregowda, Toxicity, mechanism and health effects of some heavy metals, Interdiscip. Toxicol., 7 (2014) 60–72.
  4. M. Iqbal, Vicia faba bioassay for environmental toxicity monitoring: a review, Chemosphere, 144 (2016) 785–802.
  5. K.G. Bhattacharyya, S.S. Gupta, Adsorption of a few heavy metals on natural and modified kaolinite and montmorillonite: a review, Adv. Colloid Interface Sci., 140 (2008) 114–131.
  6. F. Fenglian, Q. Wang, Removal of heavy metal ions from wastewaters: a review, J. Environ. Manage., 92 (2011) 407–418.
  7. S.S. Pillai, B. Deepa, E. Abraham, N. Girija, P. Geetha, L. Jacob, M. Koshy, Biosorption of Cd(II) from aqueous solution using xanthated nano banana cellulose: equilibrium and kinetic studies, Ecotoxicol. Environ. Saf., 98 (2013) 352–360.
  8. W. Cui, P. Fang, K. Zhu, Y. Mao, C. Gao, Y. Xie, J. Wang, W. Shen, Hydrogen-rich water confers plant tolerance to mercury toxicity in alfalfa seedlings, Ecotoxicol. Environ. Saf., 105 (2014) 103–111.
  9. H.S. Blair, J. Guthrie, T.-K. Law, P. Turkington, Chitosan and modified chitosan membranes I. Preparation and characterisation, J. Appl. Polym. Sci., 33 (1987) 641–656.
  10. A. Lagos, J. Reyes, Grafting onto chitosan. I. Graft copolymerization of methyl methacrylate onto chitosan with Fenton’s reagent (Fe2+−H2O2) as a redox initiator, J. Polym. Sci., Part A: Polym. Chem., 26 (1988) 985–991.
  11. M. Yazdani-Pedram, J. Retuert, Homogeneous grafting reaction of vinyl pyrrolidone onto chitosan, J. Appl. Polym. Sci., 63 (1997) 1321–1326.
  12. K. Kurita, A. Yoshida, Y. Koyama, Studies on chitin. 13. New polysaccharide/polypeptide hybrid materials based on chitin and poly(.gamma.-methyl L-glutamate), Macromolecules, 21 (1988) 1579–1583.
  13. Y. Shigeno, K. Kondo, K. Takemoto, Functional monomers and polymers. 90 radiation-induced graft polymerization of styrene onto chitin and chitosan, J. Macromol. Sci. Part A. Chem., 17 (1982) 571–583.
  14. L. Pengfei, Z. Maolin, W. Jilan, Study on radiation-induced grafting of styrene onto chitin and chitosan, Radiat. Phys. Chem., 6 (2001) 149–153.
  15. D.K. Singh, A.R. Ray, Radiation-induced grafting of N,N'-dimethylaminoethylmethacrylate onto chitosan films, J. Appl. Polym. Sci., 66 (1997) 869–877.
  16. D.K. Singh, A.R. Ray, Characterization of grafted chitosan films, Carbohydr. Polym., 36 (1998) 251–255.
  17. D.K. Singh, A.R. Ray, Controlled release of glucose through modified chitosan membranes, J. Membr. Sci., 155 (1999) 107–112.
  18. A.M.K. Najjar, W.M.Z.W. Yunus, M.B. Ahmad, M.Z. Ab. Rahman, Preparation and characterization
    of poly(2-acrylamido-2-methylpropane-sulfonic acid) grafted chitosan using potassium persulfate as redox initiator, J. Appl. Polym. Sci., 77 (2000) 2314–2318.
  19. M. Yazdani-Pedram, J. Retuert, R. Quijada, Hydrogels based on modified chitosan, 1. Synthesis and swelling behavior of poly(acrylic acid) grafted chitosan, Macromol. Chem. Phys., 201 (2000) 923–930.
  20. G.Z. Kyzas, P.I. Siafaka, D.A. Lambropoulou, N.K. Lazaridis, D.N. Bikiaris, Poly(itaconic acid)-grafted chitosan adsorbents with different cross-linking for Pb(II) and Cd(II) uptake, Langmuir, 30 (2014) 120–131.
  21. J.A. Sirviö, A.M. Kantola, S. Komulainen, S. Filonenko, Aqueous modification of chitosan with itaconic acid to produce strong oxygen barrier film, Biomacromolecules, 22 (2021) 2119–2128.
  22. N.B. Milosavljević, N.Z. Milašinović, I.G. Popović, J.M. Filipović, M.T. Kalagasidis Krušić, Preparation and characterization of pH-sensitive hydrogels based on chitosan, itaconic acid and methacrylic acid, Polym. Int., 60 (2011) 443–452.
  23. N.B. Milosavljević, M.Đ. Ristić, A.A. Perić-Grujić, J.M. Filipović, S.B. Štrbac, Z.Lj. Rakočević, M.T. Kalagasidis Krušić, Sorption of zinc by novel pH-sensitive hydrogels based on chitosan, itaconic acid and methacrylic acid, J. Hazard. Mater., 192 (2011) 846–854.
  24. F. Shakib, A.D. Koohi, A.K. Pirzaman, Adsorption of methylene blue by using novel chitosan-g-itaconic acid/bentonite nanocomposite - equilibrium and kinetic study, Water Sci. Technol., 75 (2017) 1932–1943.
  25. S. Dan, S. Banivaheb, H. Hashemipour, M. Kalantari, Synthesis, characterization and absorption study of chitosang- poly(acrylamide-co-itaconic acid) hydrogel, Polym. Bull., 78 (2021) 1887–1907.
  26. A.M. Awwad, M.A. Amer, Adsorption of Pb(II), Cd(II), and Cu(II) ions onto SiO2/kaolinite/Fe2O3 composites: modeling and thermodynamics properties, Chem. Int., 8 (2022) 95–100.
  27. A.M. Awwad, M.W. Shammout, M.W. Amer, Fe(OH)3/kaolinite nanoplatelets: equilibrium and thermodynamic studies for the adsorption of Pb(II) ions from aqueous solution, Chem. Int., 7 (2021) 90–102.
  28. A.M. Awwad, N.M. Salem, M.W. Amer, M.W. Shammout, Adsorptive removal of Pb(II) and Cd(II) ions from aqueous solution onto modified Hiswa iron-kaolin clay: equilibrium and thermodynamic aspects, Chem. Int., 7 (2021) 139–144.
  29. A.M. Awwad, M.W. Amer, M.M. Al-Aqarbeh, TiO2-kaolinite nanocomposite prepared from the Jordanian kaolin clay: adsorption and thermodynamics of Pb(II) and Cd(II) ions in aqueous solution, Chem. Int., 6 (2020) 168–178.
  30. A. Kausar, K. Naeem, T. Hussain, Zill-i-Huma Nazli, H.N. Bhatti, F. Jubeen, A. Nazir, M. Iqbal, Preparation and characterization of chitosan/clay composite for direct Rose FRN dye removal from aqueous media: comparison of linear and non-linear regression methods, J. Mater. Res. Technol., 8 (2019) 1161–1174.
  31. F. Azizinezhad, Surface adsorption of Pb2+ ions from aqueous solutions using chitosan grafted with a mixture of IA-MAm/bentonite, Int. J. Environ. Anal. Chem., (2022), doi: 10.1080/03067319.2021.2023514.
  32. T.S. Anirudhan, S. Rijithy, A.R. Tharun, Adsorptive removal of thorium(IV) from aqueous solutions using poly(methacrylic acid)-grafted chitosan/bentonite composite matrix: process design and equilibrium studies, Colloids Surf., A, 368 (2010) 13–22.
  33. M. Sadeghi, Synthesis and swelling behaviors of graft copolymer based on chitosan-g-poly(AA-co-HEMA), Int. J. Chem. Eng. Appl., 1 (2010) 354–358.
  34. F. Azizinezhad, Surface adsorption of an acidic dye (erionyl blue) on poly(ethylene terephthalate)-grafted-methyl methacrylate/acrylic acid, Eur. J. Exp. Biol., 4 (2014) 543–549.
  35. S. Tripathi, G.K. Mehrotra, P.K. Dutta, Physicochemical and bioactivity of cross-linked chitosan–PVA film for food packaging applications, Int. J. Biol. Macromol., 45 (2009) 372–376.
  36. K. Saita, S. Nagoka, T. Shirosaki, M. Horikawa, S. Matsuda, H. Ihara, Preparation and characterization of dispersible chitosan particles with borate crosslinking and their antimicrobial and antifungal activity, Carbohydr. Res., 349 (2012) 52–58.
  37. Y. Tan, M. Chen, Y. Hao, High efficient removal of Pb(II) by amino-functionalized Fe3O4 magnetic
    nano-particles, Chem. Eng. J., 191 (2012) 104–111.
  38. A. Balouch, M. Kolachi, F.N. Talpur, H. Khan, M.I. Bhanger, Sorption kinetics, isotherm and thermodynamic modeling of defluoridation of groundwater using natural adsorbents, Am. J. Anal. Chem., 4 (2013) 221–228.
  39. H. Freundlich, Über die adsorption in lösungen, Zeitschrift, Physikalische Chemie, 57 (1906) 385–470.
  40. S. Lagergren, Zur theorie der sogenannten adsorption gel.oster stoffe, Kungliga Svenska Vetenskapsakademiens, Handlingar, 24 (1898) 1–39.
  41. Y.S. Ho, G. McKay, Pseudo-second-order model for sorption processes, Process Biochem., 34 (1999) 451–465.
  42. Y.S. Ho, Adsorption of Heavy Metals from Waste Streams by Peat, Ph.D. Thesis, University of Birmingham, Birmingham, UK, 1995.
  43. M. Chaari, M. Feki, M. Medhioub, J. Bouzid, E. Fakhfakh, F. Jamoussi, Adsorption of a textile dye “Indanthrene Blue RS (C.I. Vat Blue 4)” from aqueous solutions onto smectite-rich clayey rock, J. Hazard. Mater., 172 (2009) 1623–1628.
  44. A. Borzou, M. Kalbasi, M. Hoodaji, M. Abdouss, A. Mohammadi, Adsorption–desorption behavior of cadmium and lead by modified poly ethylene terephthalate fiber, Bull. Environ. Pharmacol. Life Sci., 3 (2014) 209–216.
  45. M. Aliabadi, M. Irani, J. Ismaeili, H. Piri, M.J. Parnian, Electrospun nanofiber membrane of PEO/chitosan for the adsorption of nickel, cadmium, lead and copper ions from aqueous solution, Chem. Eng. J., 220 (2013) 237–243.
  46. M. Aliabadi, M. Irani, J. Ismaeili, S. Najafzadeh, Design and evaluation of chitosan/hydroxyapatite composite nanofiber membrane for the removal of heavy metal ions from aqueous solution, J. Taiwan Inst. Chem. Eng., 45 (2014) 518–526.
  47. A. Mahapatra, B.G. Mishra, G. Hota, Electrospun Fe2O3-Al2O3 nanocomposite fibers as efficient adsorbent for removal of heavy metal ions from aqueous solution, J. Hazard. Mater., 258 (2013) 116–123.
  48. M. Min, L. Shen, G. Hong, M. Zhu, Y. Zhang, X. Wang, Y. Chen, B.S. Hsiao, Micro-nano structure poly(ether sulfones)/poly(ethyleneimine) nanofibrous affinity membranes for adsorption of anionic dyes and heavy metal ions in aqueous solution, Chem. Eng. J., 197 (2012) 88–100.
  49. H.H. Najafabadi, M. Irani, L. Roshanfekr Rad, A. Heydari Haratameh, I. Haririan, Removal of Cu2+, Pb2+ and Cr6+ from aqueous solutions using a chitosan/graphene oxide composite nanofibrous adsorbent, RSC Adv., 5 (2015) 16532–16539.
  50. F. Alakhras, H. Al-Shahrani, E. Al-Abbad, F. Al-Rimawi, N. Ouerfelli, Removal of Pb(II) metal ions from aqueous solutions using chitosan-vanillin derivatives of chelating polymers, Pol. J. Environ. Stud., 28 (2019) 1523–1534.
  51. B. Wang, J. Yu, H. Liao, W. Zhu, P. Ding, J. Zhao, Adsorption of lead(II) from aqueous solution with high efficiency by hydrothermal biochar derived from honey, Int. J. Environ. Res. Public Health, 17 (2020) 3441, doi: 10.3390/ijerph17103441.
  52. S. Wierzba, Removal of Cu(II) and Pb(II) from aqueous solutions by lactic acid bacteria, Proc. ECOpole, 9 (2015) 505–512.
  53. Y. Xu, I.-K. Yoo, Removal of lead from water solution by reusable magnetic adsorbent incorporating selective leadbinding peptide, Appl. Biosci. Bioeng., 10 (2020) 6418–6428.
  54. L.B.L. Lima, N. Priyantha, Y.C. Lu, N.A.H.M. Zaidia, Adsorption of heavy metal lead using Citrus grandis (Pomelo) leaves as lowcost adsorbent, Desal. Water Treat., 166 (2019) 44–52.
  55. N. Salehi, A. Moghimi, H.R. Shahbazi, Preparation of crosslinked magnetic chitosan with
    methionine-glutaraldehyde for removal of heavy metals from aqueous solutions, Int. J. Environ. Anal. Chem., 102 (2022) 2305–2321.
  56. E. Fathi, F. Azizinezhad, M. Shabani, Surface adsorption of gallic acid by poly(ethylene terephthalate) fibers grafted 2-hydroxy propyl methacrylate/acrylamide, J. Appl. Chem., 12 (2016) 147–160.
  57. L. Ding, C. Guo, Y. Zhu, J. Ma, Y. Kong, M. Zhong, Q. Cao, H. Zhang, Adsorptive removal of gallic acid from aqueous solution onto magnetic ion exchange resin, Water Sci. Technol., 81 (2020) 1479–1493.