1. Ngah, W.S.W., N.F.M. Ariff and M.A.K.M. Hanafiah, 2010. Preparation, characterization, and environmental application of crosslinked chitosan-coated bentonite for tartrazine adsorption from aqueous solutions. Water Air Soil Pollut., 206: 225-236.
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2. Ngah, W.S.W., N.F.M. Ariff and M.A.K.M. Hanafiah, 2010. Malachite green adsorption onto chitosan coated bentonite beads: Isotherms, kinetics and mechanism. Clean-Soil Air Water, 38: 394-400.
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3. Kamal, M.H.M.A., W.M.K.W.K. Azira, M. Kasmawati, Z. Haslizaidi and W.N.W. Saime, 2010. Sequestration of toxic Pb(II) ions by chemically treated rubber (Hevea brasiliensis) leaf powder. J. Environ. Sci., 22: 248-256.
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4. Hanafiah, M.A.K.M., H. Zakaria and W.S. Wan Ngah, 2010. Base treated cogon grass (Imperata cylindrica) as an adsorbent for the removal of Ni(II): Kinetic, isothermal and fixed-bed column studies. Clean-Soil Air Water, 38: 248-256.
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5. Ngah, W.S.W. and M.A.K.M. Hanafiah, 2009. Surface modification of rubber (Hevea brasiliensis) leaves for the adsorption of copper ions: Kinetic, thermodynamic and binding mechanisms. J. Chem. Technol. Biotechnol., 84: 192-201.
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6. Hanafiah, M.A.K.M., H. Zakaria and W.S. Wan Ngah, 2009. Preparation, characterization and adsorption behavior of Cu(II) ions onto alkali-treated weed (Imperata cylindrica) leaf powder. Water Air Soil Polution, 201: 43-53.
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7. Hanafiah, M.A.K.M. and W.S. Wan Ngah, 2009. Preparation, characterization and adsorption mechanism of Cu(II) onto protonated rubber leaf powder. Clean-Soil Air Water, 37: 696-703.
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8. Ngah, W.S.W., M.A.K.M. Hanafiah and S.S. Yong, 2008. Adsorption of humic acid from aqueous solutions on crosslinked chitosan-epichlorohydrin beads: Kinetics and isotherm studies. Colloids Surfaces B: Biointerfaces, 65: 18-24.
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9. Ngah, W.S.W. and M.A.K.M. Hanafiah, 2008. Removal of heavy metal ions from wastewater by chemically modified plant wastes as adsorbents: A review. Bioresour. Technol., 99: 3935-3948.
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10. Ngah, W.S.W. and M.A.K.M. Hanafiah, 2008. Biosorption of copper ions from dilute aqueous solutions on base treated rubber (Hevea brasiliensis) leaves powder: Kinetics, isotherm and biosorption mechanisms. J. Environ. Sci., 20: 1168-1176.
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11. Ngah, W.S.W. and M.A.K.M. Hanafiah, 2008. Adsorption of copper on rubber (Hevea brasiliensis) leaf powder: Kinetic, equilibrium and thermodynamic studies. Biochem. Eng. J., 39: 521-530.
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12. Megat Hanafiah, M.A.K., M.Z.A. Yahya, H. Zakaria and S.C. Ibrahim, 2007. Adsorption of Cd(II) ions from aqueous solutions by lalang (Imperata cylindrica)leaf powder: Effect of physicochemical environment. J. Applied Sci., 7: 489-493.
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13. Hanafiah, M.A.K.M., W.S.W. Ngah, H. Zakaria and S.C. Ibrahim, 2007. Batch study of liquid-phase absorption of lead ions using lalang (Imperata cylindrica) leaf powder. J. Biol. Sci., 7: 222-230.
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14. Yahya, M.Z.A., A.M.M. Ali, M.F. Mohammat, M.A.K.M. Hanafiah and M. Mustaffa et al., 2006. Ionic conduction model in salted chitosan membranes plasticized with fatty acid. J. Applied Sci., 6: 1287-1291.
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15. Hanafiah, M.A.K.M., W.S.W. Ngah, S.C. Ibrahim, H. Zakaria and W.A.H.W. Ilias, 2006. Kinetics and thermodynamic study of lead adsorption from aqueous solution onto rubber (Hevea brasiliensis) leaf powder. J. Applied Sci., 6: 2762-2767.
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16. Hanafiah, M.A.K.M., S. Shafiei, M.K. Harun and M.Z.A. Yahya, 2006. Kinetic and thermodynamic study of Cd²⁺ adsorption onto rubber tree (Hevea brasiliensis) leaf powder. Mater. Sci. Forum, 517: 217-221.
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