1. Z. Elouear, J. Bouzid, N. Boujelben, Removal of nickel and cadmium from aqueous solutions by sewage sludge ash: study in single and binary systems., Environ. Technol., 30 (2009) 561–570.
  2. USEPA, U.S. Environmental Protection Agency Supplemental Environmental Projects Policy 2015 Update, 2015.
  3. K.S. Rao, M. Mohapatra, S. Anand, P. Venkateswarlu, Review on cadmium removal from aqueous solutions, Int. J. Eng. Sci. Technol., 2 (2010) 81–103.
  4. WHO, Safe Use of Wastewater, Excreta and Greywater Guidelines for the Safe Use of, World Health, vol. II, 2006, p. 204.
  5. R. Han, H. Li, Y. Li, J. Zhang, H. Xiao, J. Shi, Biosorption of copper and lead ions by waste beer yeast, J. Hazard. Mater., 137 (2006) 1569–1576.
  6. I. Fahad, A. Al-Khaldi, B. Abusharkh, M. Khaled, M.A. Atieh, M.S. Nasser, T. Laoui, T. Saleh, S. Agarwale, I. Tyagie, V.K. Gupta, Adsorptive removal of cadmium(II) ions from liquid phase using acid modified carbon-based adsorbents, J. Mol. Liq., 204 (2015) 255–263.
  7. F.A. Al-Khaldi, B. Abu-Sharkh, A.M. Abulkibash, M.A. Atieh, Cadmium removal by activated carbon, carbon nanotubes, carbon nanofibers, and carbon fly ash: a comparative study, Desal. Wat. Treat., 53 (2015) 1417–1429.
  8. B.S. Tawabini, S.F. Al-Khaldi, M.M. Khaled, M.A Atieh, Removal of arsenic from water by iron oxide nanoparticles impregnated on carbon nanotubes., J. Environ. Sci. Health Part A Toxic/ Hazard. Subst. Environ. Eng., 46 (2011) 215–223.
  9. P. Ricou-Hoeffer, I. Lecuyer, P. Le Cloirec, Experimental design methodology applied to adsorption of metallic ions onto fly ash, Water Res., 35 (2001) 965–976.
  10. A. Denizli, K. Kesenci, Y. Arica, E. Pişkin, Dithiocarbamateincorporated monosize polystyrene microspheres for selective removal of mercury ions, React. Funct. Polym., 44 (2000) 235–243.
  11. I. Ali, New generation adsorbents for water treatment, Chem. Rev., 112 (2012) 5073–5091.
  12. M.D. Meitei, M.N. V Prasad, Lead (II) and cadmium (II) biosorption on Spirodela polyrhiza (L.) Schleiden biomass, J. Environ. Chem. Eng., 1 (2013) 200–207.
  13. A. Saeed, M. Iqbal, M.W. Akhtar, Removal and recovery of lead(II) from single and multimetal (Cd, Cu, Ni, Zn) solutions by crop milling waste (black gram husk), J. Hazard. Mater., 117 (2005) 65–73.
  14. N. Ahalya, R.D. Kanamadi, T.V. Ramachandra, Biosorption of chromium (VI) from aqueous solutions by the husk of Bengal gram (Cicer arietinum), Electron. J. Biotechnol., 8 (2005) 258–264.
  15. A. Maleki, A.H. Mahvi, M.A. Zazouli, H. Izanloo, A.H. Barati, Aqueous cadmium removal by adsorption on barley hull and barley hull ash, Asian J. Chem., 23 (2011) 1373–1376.
  16. V.K. Gupta, C.K. Jain, I. Ali, M. Sharma, V.K. Saini, Removal of cadmium and nickel from wastewater using bagasse fly ash – a sugar industry waste, Water Res., 37 (2003) 4038–4044.
  17. I.Y. El-sherif, N.A. Fathy, Modification of adsorptive properties of bagasse fly ash for uptaking cadmium from aqueous solution, Environ. Res. Eng. Manage., 2 (2013) 19–28.
  18. B.W. Stanton, J.J. Harris, M.D. Miller, M.L. Bruening, Ultrathin, multilayered polyelectrolyte films as nanofiltration membranes, Langmuir, 19 (2003) 7038–7042.
  19. F. Abuilaiwi, T. Laoui, M. Al-harthi, M.A. Atieh, Modification and functionalization of multiwalled carbon nanotube (MWCNT) via Fischer esterification, Arabian J. Sci. Eng., 35 (2010) 37–48.
  20. F.A. Olabemiwo, B.S. Tawabini, F. Patel, T.A. Oyehan, M. Khaled, T. Laoui, Cadmium removal from contaminated water using polyelectrolyte-coated industrial waste fly ash, Bioinorg. Chem. Appl., 2017 (2017) 13 pages.
  21. P.R. Van Tassel, Polyelectrolyte adsorption and layer-by-layer assembly: electrochemical control, Curr. Opin. Colloid Interface Sci., 17 (2012) 106–113.
  22. Q. Li, B. Wang, C. Li, J. Pang, J. Zhai, Synthesis of fly-ash cenospheres coated with polypyrrole using a layer-by-layer method, J. Phys. D: Appl. Phys., 44 (2011) 1–6.
  23. H.A. Asmaly, B. Abussaud, T.A. Saleh, T. Laoui, V.K. Gupta, M.A. Atieh, Adsorption of phenol on aluminum oxide impregnated fly ash, Desal. Wat. Treat., 57 (2016) 6801–6808.
  24. I. Langmuir, The adsorption of gases on plane surfaces of glass, mica and platinum, J. Am. Chem. Soc., 40 (1918) 1361–1403.
  25. H.M.F. Freundlich, Uber die adsorption in losangen, Z. Phys. Chem., 57 (1906) 385–470.
  26. V. Rathod, H. Pansare, S.A. Bhalerao, S.D. Maind, Adsorption and desorption studies of cadmium (II) ions from aqueous solutions onto Tur pod (Cajanus cajan), Int. J. Adv. Chem. Res., 4 (2015) 30–38.
  27. L. Dubinin, M.M. Radushkevich, Equation of the characteristics curves of activated charcoal, Acad. Sci. Phys. Chem. Sect., 55 (1947) 331–333.
  28. S.M. Yakout, E. Elsherif, Batch kinetics, isotherm and thermodynamic studies of adsorption of strontium from aqueous solutions onto low cost rice-straw based carbons, Carbon – Sci. Technol., 3 (2010) 144–153.
  29. B.P. Bering, M.M. Dubinin, V.V. Serpinsky, On thermodynamics of adsorption in micropores, J. Colloid Interface Sci., 38 (1972) 185–194.
  30. G. Scatchard, attractions of proteins for small molecules and ions, Ann. N.Y. Acad. Sci., 51 (1949) 660–672.
  31. Y.I. Henis, A. Levitzki, An analysis on the slope of Scatchard plots, Eur. J. Biochem., 71 (1976) 529–532.
  32. T.S. Anirudhan, P.S. Suchithra, Equilibrium, kinetic and thermodynamic modeling for the adsorption of heavy metals onto chemically modified hydrotalcite, Indian J. Chem. Technol., 7 (2010) 247–259.
  33. M. Küçükosmanogˇlu, O. Gezici, A. Ayar, The adsorption behaviors of Methylene Blue and Methyl Orange in a diaminoethane sporopollenin-mediated column system, Sep. Purif. Technol., 52 (2006) 280–287.
  34. F.A. Dawodu, G.K. Akpomie, M.A. Abuh, Equilibrium isotherm studies on the batch sorption of copper (II) ions from aqueous solution unto ‘Nsu clay’, Intern. J. Sci. Eng. Res., 3 (2012) 1–7.
  35. R. Leyva-Ramos, J.R. Rangel-Mendez, J. Mendoza-Barron, L. Fuentes-Rubio, R.M. Guerrero-Coronado, Adsorption of cadmium(II) from aqueous solution onto activated carbon, Water Sci. Technol., 35 (1997) 205–211.
  36. F.A. Olabemiwo, B.S. Tawabini, F. Patel, T.A. Oyehan, M. Khaled, Assessment of Cadmium (II) Removal from Water by Innovative Polyelectrolyte-Coated Fly Ash, 15th International Conference on Environmental Science and Technology. Rhodes, Greece, 31 August to 2 September 2017.
  37. F.A. Olabemiwo, The Potential Capacity of Carbon Fly Ash Coated with Polyelectrolytes in Removing Cadmium from Water, KFUPM, 2017.
  38. R. Shawabkeh, M.J. Khan, A.A. Al-Juhani, H.I. Al-Abdul Wahhab, I.A. Hussein, Enhancement of surface properties of oil fly ash by chemical treatment, Appl. Surf. Sci., 258 (2011) 1643–1650.
  39. O.O. Ajumobi, O. Muraza, I.A. Bakare, A.M. Al Amer, Ironand cobalt-doped ceria−zirconia nanocomposites for catalytic cracking of naphtha with regenerative capability, Energy Fuels, 31 (2017) 12612–12623.
  40. M. Thommes, K. Kaneko, A.V. Neimark, J.P. Olivier, F. Rodriguez- Reinoso, J. Rouquerol, K.S.W. Sing, Physisorption of gases, with special reference to the evaluation of surface area and pore size distribution (IUPAC Technical Report), Pure Appl. Chem., 87 (2015) 1051–1069.
  41. V.T.P. Vinod, R.B. Sashidhar, A.A. Sukumar, Competitive adsorption of toxic heavy metal contaminants by gum kondagogu (Cochlospermum gossypium): a natural hydrocolloid, Colloids Surf., B, 75 (2010) 490–495.
  42. K.G. Akpomie, F.A. Dawodu, K.O. Adebowale, Mechanism on the sorption of heavy metals from binary-solution by a low cost montmorillonite and its desorption potential, Alexandria Eng. J., 54 (2015) 757–767.
  43. K.G. Akpomie, F.A. Dawodu, Physicochemical analysis of automobile effluent before and after treatment with an alkalineactivated montmorillonite, J. Taibah Univ. Sci., 9 (2015) 465–476.
  44. G.H. Pino, L.M. Souza De Mesquita, M.L. Torem, G.A.S. Pinto, Biosorption of cadmium by green coconut shell powder, Miner. Eng., 19 (2006) 380–387.
  45. U. Farooq, J.A. Kozinski, M.A. Khan, M. Athar, Biosorption of heavy metal ions using wheat based biosorbents – a review of the recent literature, Bioresour. Technol., 101 (2010) 5043–5053.
  46. G. Gupta, N. Torres, Use of fly ash in reducing toxicity of and heavy metals in wastewater effluent, J. Hazard. Mater., 57 (1998) 243–248.
  47. K.G. Bhattacharyya, S. Sen Gupta, Kaolinite, montmorillonite, and their modified derivatives as adsorbents for removal of Cu(II) from aqueous solution, Sep. Purif. Technol., 50 (2006) 388–397.
  48. M. Ali, Removal of phenol from water different types of carbon – a comparative analysis, Procedia – Soc. Behav. Sci., 10 (2014) 136–141.
  49. S.B. Adebayo, B.S. Tawabini, M.A. Atieh, F.A. Abuilaiwi, S. Alfadul, Investigating the removal of methyl tertiary butyl ether (MTBE) from water using raw and modified fly ash waste materials, Desal. Wat. Treat., 57 (2016) 26307–26312.
  50. O.S. Akintola, T.A. Saleh, M.M. Khaled, O.C.S. Al Hamouz, Removal of mercury (II) via a novel series of cross-linked polydithiocarbamates, J. Taiwan Inst. Chem. Eng., 60 (2016) 602–616.
  51. H.A. Hegazi, Removal of heavy metals from wastewater using agricultural and industrial wastes as adsorbents, HBRC J., 9 (2013) 276–282.
  52. G. McKay, Y.S. Ho, J.C.Y. Ng, Biosorption of copper from waste waters: a review, Sep. Purif. Rev., 28 (1999) 87–125.
  53. M.B. Desta, Batch sorption experiments: Langmuir and Freundlich isotherm studies for the adsorption of textile metal ions onto teff straw (Eragrostis tef) agricultural waste, J. Thermodyn., 1 (2013) 6 pages.
  54. C. Septhum, S. Rattanaphani, J.B. Bremner, V. Rattanaphani, An adsorption study of Al(III) ions onto chitosan, J. Hazard. Mater., 148 (2007) 185–191.
  55. W.J. Weber, Physicochemical Processes for Water Quality Control, Wiley-Interscience, New York, 1972. 6 pages
  56. K.K. Panday, G. Prasad, V.N. Singh, Mixed adsorbents for Cu(II) removal from aqueous solutions, Environ. Technol. Lett., 7 (1986) 547–554.