Khairuddin Md Isa, Dr.
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/41118
2024-03-28T15:36:20ZThermogravimetric analysis and the optimisation of bio-oil yield from fixed-bed pyrolysis of rice husk using response surface methodology (RSM)
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/11304
Thermogravimetric analysis and the optimisation of bio-oil yield from fixed-bed pyrolysis of rice husk using response surface methodology (RSM)
Khairuddin, Md Isa; Suhardy, Daud; Nasrul, Hamidin; Khudzir, Ismail; Saiful Azhar, Saad; Farizul Hafiz, Kasim
The effects of pyrolysis temperature, heating rate, particle size, holding time, and gas flow rate were investigated to optimize bio-oil yield from rice husk pyrolysis. Thermogravimetric analysis showed thermal degradation of hemicellulose, cellulose and lignin, indicating faster decomposition of cellulose compared to lignin. The optimisation process was analysed by employing central composite design (CCD) in response surface methodology (RSM) using Design Expert Version 7.5.1 (StatEase, USA). A two-level fractional factorial was initially carried out and followed by RSM. The statistical analysis showed that pyrolysis temperature, heating rate, particle size and holding time significantly affected the bio-oil yield. By utilising response surface method, these four factors were investigated, analysed and optimal conditions were obtained at pyrolysis temperature of 473.37 °C, heating rate of 100 °C/min, particle size of 0.6 mm and holding time of 1 min. Confirmation runs gave 48.30% and 47.80% of bio-oil yield compared to 48.10% of predicted value. Furthermore, the pyrolytic bio-oils obtained from fixed-bed pyrolysis were examined using gas chromatographic/mass spectroscopy (GC/MS), Fourier transform infrared (FTIR) methods, elemental analyzer, pH probe and bomb calorimeter.
Link to publisher’s homepage at http://www.elsevier.com/
2011-03-01T00:00:00ZChemically modified sugarcane bagasse as a potentially low-cost biosorbent for dye removal
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/10229
Chemically modified sugarcane bagasse as a potentially low-cost biosorbent for dye removal
Saiful Azhar, Saad; Khairuddin, Md. Isa; Rohazita, Bahari
The use of adsorbent prepared from sugarcane bagasse, an agro waste from sugar
industries has been studied as an alternative substitute for activated carbon for the
removal of dyes from wastewater. Adsorbents prepared from sugarcane bagasse were
successfully used to remove the methyl red (MR) from an aqueous solution in a batch
reactor. This study investigates the potential use of sugarcane bagasse, pretreated with
phosphoric acid (SBC), for the removal of methyl red from simulated wastewater.
Phosphoric acid treated sugarcane bagasse was used to adsorb methyl red at varying
dye concentration, adsorbent dosage, pH and contact time. A similar experiment was
conducted with commercially available powdered activated carbon (PAC) and untreated
sugarcane bagasse (SB) in order to evaluate the performance of SBC. The adsorption
efficiency of different adsorbents was in the order PAC > SBC > SB. The initial pH 3 to 6
favoured the adsorption of synthetic dyes by both SBC and SB. This prepared
adsorbent was very efficient in decolorized diluted solution. It is proposed that SBC, in a
batch or stirred tank reactors could be employed as a low-cost alternative in wastewater
treatment for dyes removal.
Link to publisher’s homepage at http://www.elsevier.com/
2010-12-15T00:00:00Z