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Articles by Collin G. Joseph
Total Records ( 3 ) for Collin G. Joseph
  Collin G. Joseph , Awang Bono , Duduku Krishnaiah , Chow Yee Ling and Ng Chiew Ban
  The aim of this investigation was to study the morphology and sorption kinetic studies of an L-type activated carbon prepared from Oil Palm Shells (OPS) by way of the two stage activation method in self-generated atmosphere using a muffle furnace. Both L-type dehydrating agents, zinc chloride and phosphoric acid were used as the chemical activation agent. For the ZnCl2 samples, the optimum adsorption capacity was obtained when the samples were subjected to semi-carbonization of 400°C, 5 M ZnCl2 impregnating solution, followed by pyrolysis at 400°C. Whereas for the H3PO4 samples, semi-carbonization of 400°C followed by 4.5 M H3PO4 impregnating solution and pyrolysis at 400°C has shown to produced the optimum adsorption capacity. All activated carbons were fitted well in the Langmuir adsorption isotherm and the pseudo-second-order kinetics. These results demonstrated that this agricultural waste has the potential to be converted into high-capacity adsorbent for the remediation of waste waters.
  Collin G. Joseph , A. Bono , S.M. Anisuzzaman , D. Krishnaiah and W.C. Tan
  The study aims to use, soot as adsorbent for the removal of 2, 5-dichlorophenol (2, 5-DCP) in aqueous medium. The adsorption kinetic and isotherm were studied using a variety of adsorption models. Soot, obtain from the exhaust pipe of vehicles, was a poor adsorbent with a very limited surface area. As such, the adsorption of 2, 5-DCP had to be conducted for 7 h in order to achieve equilibrium which was between the 240 and 360th min. The highest percentage of removal of 2, 5-DCP achieve was 43.9%. This showed that soot was a weak adsorbent. The experimental data showed that the adsorption kinetics and adsorption isotherm of 2, 5-DCP by soot obeyed the pseudo-second order kinetic model (R2 = 0.9985) and Freundlich isotherm (R2 = 0.9825), respectively indicating that both physisorption and chemisorptions were instrumental in the adsorption process. Characterization of the soot recovered from the exhaust pipe showed that the ash content and moisture content in soot were quite high at 4.62 and 2.50%, respectively. The SEM indicated that the soot was nanoparticle in size (>100 nm) with non-visible pores. The soot had spherical shape and tend to cluster together forming aggregates. The FTIR showed that the functional groups such as O-H, C-H and C = O groups, may have contributed to the adsorption process. The BET isotherm indicated that soot obey the type III isotherm without the presence of hysteresis loop. Although this material is not a good adsorbent, it adsorptive ability may be improved by altering its structure chemically providing a waste to wealth opportunity.
  Collin G. Joseph , Wan Mohd Ashri Wan Daud , Quek Kye Shane and Kogularama Sanmugam
  The potential of using Empty Fruit Bunch (EFB), an agrowaste material, as a low-cost biosorbent for the removal of Reactive Black 5 (RB5) from aqueous solution was investigated in this study. The influences of solution pH, contact time, initial concentration and biosorbent dosage were studied in batch experiments at room temperature. Adsorption equilibrium was achieved after 30 min of agitation. The maximum adsorption uptake of RB5 dye occurred at pH 2, resulting in a rapid adsorption (more than 50% RB5 uptake) for the first 5 min of contact. Lower solution pH values showed better adsorption because the dye molecules tend to adsorb on positively charged adsorbent sites. Furthermore, higher biosorbent dosages increased the dye uptake by up to 90% due to the availability of more active adsorption sites. Both the pseudo-second-order kinetic model and the Langmuir model indicated that monolayer coverage on the adsorbent was dominant and that chemisorption was the rate-determining step.
 
 
 
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