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Articles by S.M. Anisuzzaman
Total Records ( 9 ) for S.M. Anisuzzaman
  S.M. Anisuzzaman , Awang Bono , Duduku Krishnaiah , Norazwinah Azreen Hussin and Hong Ying Wong
  The objective for this work was to study the characteristics of Semi Refined Carageenan (SRC) which extracted from Kappaphycus alvarezii. The production of SRC was conducted by alkali treatment of seaweed and to obtain the powder used spray drying technique. This analysis based on two independent parameter which are concentration of potassium hydroxide (KOH) and extraction time. Extraction temperature during alkali treatment process was fixed as constant which was 70-80°C. The optimization of extraction process parameters and the experimental design were done based on Central Composite Design (CCD) of Response Surface Methodology (RSM). Gel viscosity, powder weight of SRC, particle size and gel strength were studied as responses. The bounds of all these factors keyed in the RSM to get the predicted number of experiments. Optimum process extractions for spray drying technique result showed at 6.70% of KOH concentration and 74.70 minute extraction time. At optimum conditions the viscosity of the SRC gel was found as 111.80 cP and the particle size of SRC powder was found as 86.88 μm. Gel strength was optimize at 85.60 g cm-2 and SRC powder production as 5.01 g.
  Duduku Krishnaiah , Rosalam Sarbatly , Awang Bono , S.M. Anisuzzaman and Sharmila Subramaniam
  Transesterification of methyl ester is a reversible reaction and requires excess methanol to drive the reaction forward. In this study, Polyethylene Glycol (PEG) membrane reactor was used to separate glycerol during reaction, to attain high conversion of palm oil at lower methanol to oil ratio. Thus reduces the amount of methanol used. The transesterification of palm oil was performed using base catalyst. Experiments were performed in the membrane reactor in batch mode at different catalyst concentrations and different molar ratio (methanol/oil). Asymmetric polyethersulfone ultrafiltration flat sheet membranes with Polyethylene Glycol (PEG) of different molecular weight as additive were prepared by phase inversion process from casting solution containing Polyethersulfone (PES) as polymer, N,N-porylydone (NMP) as solvent and PEG of different molecular weights namely PEG 200, PEG 300 and PEG 400 as additives. The results show that PES with different PEG as additive are suitable for separation of glycerol during the reaction.
  Duduku Krishnaiah , Rosalam Sarbatly , S.M. Anisuzzaman and Rendy Kasin
  Dense ceramic membrane has become a major selection for its potential to give high oxygen enrichment from surrounding air. The separation through dense ceramic membrane has overcome several limitations of polymeric membrane material and therefore it is capable of performing efficient means of oxygen production. Experiments were carried out to study the potential of ceramic membrane for oxygen system on oxygen/nitrogen mixtures, where the effects of operating pressure and temperature were observed and discussed. The oxygen concentration in the permeate stream increases when the operating pressure increased for each set of air flow rate of 20, 30 and 40 LPM. The permeate oxygen concentration at 40 LPM and 25 psi was found to be 5.30 ppm where as at 20 LPM and 150°C and was 5.13 ppm.
  Duduku Krishnaiah , Rosalam Sarbatly , S.M. Anisuzzaman , Rajesh Nithyanandam and Phong Ming San
  This study conducted adsorption experiments on azeotropic and non-azeotropic mixtures at a constant temperature in the presence and absence of ultrasound. Ultrasound waves were applied at a frequency of 21 kHz and amplitude of 25% at atmospheric pressure. The adsorption of azeotropic and non-azeotropic mixtures was evaluated according to Gibbs dividing plane theory. The results indicated that the adsorptive capacity of azeotropic and non-azeotropic mixtures on activated carbon decreased in the presence of ultrasound.
  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.
  Duduku Krishnaiah , Awang Bono , S.M. Anisuzzaman , Collin Joseph and Teo Bee Khee
  Carbon dioxide (CO2) among other air pollutants is a major culprit to the greenhouse gases that is fueling global warming. To mitigate global warming, Kyoto Protocal urges 37 industrialized nations and European Union to reduce their greenhouse gas emissions to a level of 5.2% on average lower than those of 1990 during the period of 2008-2012. It is therefore essential to develop the CCS technologies to cope with the global demand of CO2 reduction. In this study the technologies of CO2 removal are reviewed.
  S.M. Anisuzzaman , D. Krishnaiah , C.G. Joseph , S. Abang and W.K. Tai
  Petroleum has been a major energy sources to our human being in operating machine and in other usages. The high profitable petroleum is important in our daily life but before acquiring the useful products, there are also impurities such as hydrogen sulfide which is available in the crude oil that must be removed to avoid any hazard that could bring to the environment and human health. In oil refinery industry, hydrogen sulfide is commonly removed through water stripper but very little data is available on the removal of hydrogen sulfide using adsorption process. Thus, in this study, simulation modeling of adsorption of hydrogen sulfide onto activated carbon was carried out by providing respective adsorption isotherm, adsorption kinetic, mass balance and kinetic modeling. Under isothermal conditions with no pressure drop and constant velocity, the simulation had been conducted to justify the feasibility of the data provided by the industry after optimizing the size of adsorption bed that should be used. Most of the parameters should be assumed with a reasonable value in order to continue with the simulation. As a result, the actual data provided by the industry shows the feasibility of the size of adsorption bed after optimization due to the high flow rate and high hydrogen sulfide concentration.
  D. Krishnaiah , S.M. Anisuzzaman , C.G. Joseph , S. Abang and L.C. Siang
  Water pollution is a very persistent problem. The intensive throwing up of different toxic substances without control constitutes a real danger for humanity. Phenolic compounds are common contaminants in wastewater, generated by petroleum and petrochemical, coal conversion and phenol producing industries. The phenols are considered as priority pollutants since they are harmful to organisms at low concentrations because of their potential harm to human health. United State Environmental Protection Agency (EPA) regulations call for lowering phenol content in wastewater to less than 1 mg L-1 before discharging. This study focuses on the feasibility of using activated carbon to remove phenol from waste water in industry. Simulation by Aspen Adsorption is conducted to investigate the feasibility. Several sensitivity analyses such as changing the parameters which affected the rate of adsorption are discussed. Besides that, it is found that the scaling up of the column is not practicable in industry.
  S.M. Anisuzzaman , D. Krishnaiah , S. Abang and G.M. Labadin
  This study reviews the suitability and effectiveness of oil palm shells as low cost adsorbents via physically activation with carbon dioxide as an adsorbent for denitrogenation of fuel under different concentrations. With hydrogen, high temperature and pressure, hydro-denitrogenation (HDN) is used to remove Nitrogen Containing Compounds (NCCs). However, the cost of HDN is increasing rapidly due to the increasing concentration of NCCs in fossil fuels. NCCs compete with sulfur compounds on the active sites of catalysts in the conventional process. Therefore, NCCs should be removed as much as possible. Thus, searching for an alternative process to remove NCCs in a cost efficient manner is very important.
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