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Articles by M.Z.A. Yahya
Total Records ( 3 ) for M.Z.A. Yahya
  M.A.K. Megat Hanafiah , M.Z.A. Yahya , H. Zakaria and S.C. Ibrahim
  The adsorption of cadmium from aqueous solution with a plant waste particularly Lalang or Imperata cylindrica (IC) leaf powder was investigated. The effect of various operating variables mainly adsorbate concentration, adsorbent dose, adsorbent size, temperature and pH was studied. The adsorption of Cd2+ ions increased with increase in pH, temperature, adsorbent dose and decrease in adsorbent size. Adsorption was rapid and occurred within 15 min for cadmium concentration of 1 mg L-1 and 30 min for cadmium concentrations of 2 and 5 mg L-1. The kinetic process of Cd2+ adsorption onto IC leaf powder was found to fit the pseudo-second-order rate equation.
  M.Z.A. Yahya , A.M.M. Ali , M.F. Mohammat , M.A.K.M. Hanafiah , M. Mustaffa , S.C. Ibrahim , Z.M. Darus and M.K. Harun
  In this study, chitosan was used as the host with lithium acetate (LiOAc) as the doping salt and Palmitic Acid (PA) and Oleic Acid (OA) as plasticizers. The highest conducting film containing salt has composition 55 wt. % CA and 45 wt. % LiOAc. Complexation between chitosan and the salt can be proven by Fourier Transform Infrared (FTIR) method. The NH2 and O = C-NHR vibrations which can be observed at 1580 and 1655 cm-1 shift to lower wavenumbers when the complexes are formed. In this study, other than the salt, plasticizers are also added to the polymer with the aim of enhancing the electrical conductivity of the polymer, the mixing of these three components could lead to some interactions for the formation of the polymer electrolyte with its own unique properties. Hence, apart from justifying the occurrence of complexation, it is also essential to know the possible interactions between the salt and plasticizer, the plasticizer and the polymer and within the polymer-salt-plasticizer system. With such knowledge, a model of the polymer-salt and plasticizer system could be devised which might be able to explain the electrolytic property of the sample, in particular, the ion conducting mechanism.
  M.Z.A. Yahya , M.K. Harun , A.M.M. Ali , M.F. Mohammat , M.A.K.M. Hanafiah , S.C. Ibrahim , M. Mustaffa , Z.M. Darus and F. Latif
  Chitosan was used as the host polymer with lithium acetate (LiOAc) as the doping salt and Palmitic Acid (PA) and Oleic Acid (OA) as plasticizers. The highest conductivity value was obtained for film containing salt 55 wt. % CA and 45 wt. % LiOAc. At this composition, the surface of the film shows clusters of needle or dendrite-like structures. The x-ray diffractogram shows peaks at 2θ = 16°, 21°, 26° and 31° attributed to the salt. The peaks are small and relatively broad in comparison to sample with equal amounts of polymer and salt. The surface of the film shows that the salt has recrystallized out of the film. This could reduce the number of mobile lithium ions in the film and thus lower the conductivity of this sample. Both films formed from solution containing 1.0 g chitosan +0.20 g oleic acid and containing 1.0 g chitosan +0.40 g oleic acid have a porous surface. Such films could be suitable as a separator for lithium ion cells. This surface morphology is different from those films obtained from a solution containing 1.0 g chitosan +0.40 g ethylene carbonate. The highest conducting OA plasticized film contains 50 wt. % CA, 40 wt. % LiOAc and 10 wt. % OA. The surface looks soft and spongy with tunnel-like structures.
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