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Baharak Sajjadi,A.R. Abdul Aziz,Saeid Baroutian,Shaliza Ibrahim 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
The 3D simulation of convection and diffusion phenomena within a ceramic membrane during transesterification reaction was the aim of this study. The ceramic membrane was a tubular micro porous TiO2/Al2O3 packed with the heterogeneous catalyst. The Navier–Stokes, Brinkman and Stephan–Maxwell equations were applied for investigation of fluid flow reaction and mass transfer within the system. The value of the convection was generally between 104 and 107 times higher than diffusion. It depends on concentration component, the diffusion coefficient and components velocity. A good agreement was found with the maximum deviation of 8% from experimental data.
Review on the main advances in photo-Fenton oxidation system for recalcitrant wastewaters
Shima Rahim Pouran,A.R. Abdul Aziz,Wan Mohd Ashri Wan Daud 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
This paper reviews themain advances in photo-Fenton oxidation treatment for recalcitrant wastewaters. This oxidation method is able to produce biodegradable intermediates and mineralize such pollutantseffectively when the main operational conditions are at optimum level. However, cost of the process isone of the main limitations. Several strategies have been put in practice to minimize cost and improvephoto-Fenton efficiency primarily through application of heterogeneous catalysts and/or chelatingagents. In addition, cost can be further reduced by applying solar energy and integrating biologicaltreatment technologies in the treatment process.
Hybrid of Fenton and sequencing batch reactor for petroleum refinery wastewater treatment
B.H. Diya’uddeen,Shima Rahim Pouran,A.R. Abdul Aziz,S.M. Nashwan,Wan Mohd Ashri Wan Daud,M.G. Shaaban 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.25 No.-
The treatment of high-strength petroleum refinery effluent (PRE) with [BOD5]/[COD]0 = 0.14 was investigated using combined Fenton–sequencing batch reactor (SBR). The effect of [H2O2]:[COD]0 molar ratio on biodegradability enhancement was investigated. Fenton optimal conditions were: [H2O2]:[COD]0 of 6, [H2O2]:[Fe0] of 10 and pH = 3.0 that could remove 76.5%, 45% and 96% of COD, TOC and phenol and increased biodegradability ratio to 0.37. The pretreated PRE subjected to SBR for one single cycle of 10 h. The results revealed the effectiveness of hybrid Fenton–SBR system in treating PRE where the complete treatment of the PRE was attained by this system.
The effects of catalysts in biodiesel production: A review
I.M. Atadashi,M.K. Aroua,A.R. Abdul Aziz,N.M.N. Sulaiman 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.1
Biodiesel fuel has shown great promise as an alternative to petro-diesel fuel. Biodiesel production is widely conducted through transesterification reaction, catalyzed by homogeneous catalysts or heterogeneous catalysts. The most notable catalyst used in producing biodiesel is the homogeneous alkaline catalyst such as NaOH, KOH, CH3ONa and CH3OK. The choice of these catalysts is due to their higher kinetic reaction rates. However because of high cost of refined feedstocks and difficulties associated with use of homogeneous alkaline catalysts to transesterify low quality feedstocks for biodiesel production, development of various heterogeneous catalysts are now on the increase. Development of heterogeneous catalyst such as solid and enzymes catalysts could overcome most of the problems associated with homogeneous catalysts. Therefore this study critically analyzes the effects of different catalysts used for producing biodiesel using findings available in the open literature. Also, this critical review could allow identification of research areas to explore and improve the catalysts performance commonly employed in producing biodiesel fuel.
Ayesha Siddika,Tasnim Zahan,Lipy Khatun,Md. Rowshanul Habib,Md. Abdul Aziz,A. R. M. Tareq,Md. Habibur Rahman,Md. Rezaul Karim 한국식품과학회 2020 Food Science and Biotechnology Vol.29 No.9
This study was designed to evaluate the antioxidantactivity of methanol extract of Averrhoa carambollaLinn. leaves (MELA) using DPPH˙ and ABTS˙+ free radicalscavenging assays whereas its antineoplastic effectagainst Ehrlich ascites carcinoma (EAC) was assed usingviable cell count, life span, body weight gain and hematologicalparameters of experimental mice. Results showedthat rich phenolic and flavonoid content of MELA hadmoderate dose dependent free radical scavenging activity(IC50: 62.0 lg/mL for DPPH˙ and 6.0 lg/mL for ABTS˙+). In vivo antineoplastic assay, MELA significantly(P\0.05) decreased viable cells and body weight gain,increased the survival time and restored altered hematologicalprofiles of cancer cell bearing mice. Fluorescencemicroscopic view of EAC cells derived from MELA-treatedgroup showed apoptotic characteristics and this observationwas also supported by overexpression of proapoptoticgenes coding p53 and Bax proteins in treatedcancer cells. The anti-apoptotic genes coding Bcl-2 proteinwas also absent in treated EAC cells as compared with thecontrol. Moreover, phytochemical profiles of MELA asidentified by GC/MS analysis are also consistent with itsactivities.