Development and characterization of disk supported carbon membrane prepared by one-step coating-carbonization cycle

N.H. Ismail,W.N.W. Salleh,N. Sazali,A.F. Ismail 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-

Different dope solutions for the alumina disk supported carbon membrane preparation for CO2/N2 and CO2/CH4 separation was formulated in this study. The prepared polymeric membrane made of commercial co-polyimide BTDA-TDI/MDI (P84) was carbonized at 700 °C under N2 gas flow. A defect-free membrane was obtained when high polymer composition was used. The disk supported carbon membrane with CO2/N2 and CO2/CH4 selectivity of 15 and 45, respectively, and CO2 permeance of 400 Barrer were obtained by one-step spray coating technique. The polymer composition of 12 wt% was concluded to be the optimum composition for the alumina disk supported carbon membranes.

Matrimid-based carbon tubular membrane: Effect of carbonization environment

N. Sazali,W.N.W. Salleh,N.A.H.M. Nordin,A. F. ISMAIL 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.32 No.-

Among gas separation materials, carbon membrane exhibits the most interesting performance in termsof selectivity, stability, and gas permeance. By controlling and optimizing carbonization environment,excellent gas separation performances can be achieved. In this study, tubular supported carbonmembrane was prepared using Matrimid as polymeric precursor. In order to produce high performancecarbon membrane, the effect of carbonization conditions on the gas permeation properties wasinvestigated. The polymer solution was coated on the surface of the tubular support by using dip-coatingmethod. Carbon membranes were fabricated by heat treatment process under controlled carbonizationenvironments; Ar or N2. Pure gas permeation tests were performed using CO2, CH4, and N2 at roomtemperature with pressure 8 bar. Based on the results, the highest CO2/CH4 and selectivity of 87.34 andCO2/N2 selectivity of 79.60 were obtained by carbon membrane carbonized under Ar gas. Despite thehigher carbonization temperature, the carbonization under Ar created more permeable pores ascompared to N2 environment.

Tailoring the properties of polyamide thin film membrane with layered double hydroxide nanoclay for enhancement in water separation

Tajuddin M.H.,Yusof N.,Fajrina N.,Salleh W.N.W.,Ismail A.F.,Jaafar J.,Aziz F. 한국물리학회 2022 Current Applied Physics Vol.34 No.-

This current paper presented a new candidate and potentially to improve the current membrane materials in water filtration process. With that, the primary materials used in this research study is layered double hydroxides (LDH) nanoclay which can be obtained from earth minerals and self-synthesized from inorganic salts were discussed thoroughly to help a better understanding of these materials. However, the current technologies of water separation were still lagging behind and ineffective especially in removal of divalent metal ions and multivalent salts. Infeasibility of reverse osmosis membrane make it not a viable option for divalent salts filtration. With that, nanofiltration (NF) membrane offered as an alternative to substitute available method. In this study, thin film nanocomposite (TFN) membranes were fabricated by incorporating layered double hydroxides (LDH) nanoclay. The LDH nanoclay with different loading ratio of 0, 0.05, 0.1, 0.15 and 0.2 were impregnated into polyamide layer on top of polysulfone substrates. The fabricated TFN were characterized in terms of physicochemical properties (SEM and FTIR) and membrane hydrophilicity (contact angle). After the addition of LDH, the morphological structures of TFN membranes were changed and the surface hydrophilicity was enhanced significantly. FESEM images displayed a typical ridge and valley morphology with nodule-like structures. As the LDH loading was increased, the contact angle decreased from 34.56◦ to 15.76◦ showing the surface hydrophilicity of membrane is improved. The separation performance of membrane was evaluated in terms of salt rejection ability by cross flow filtration system. The best performance NF membrane was found to be TFN 0.05 with high water flux and MgCl2 rejection with values of 24.18 L/m2.h and 91% respectively. This study has experimentally validated the potential of LDH materials in membrane process for improvement in water separation process.

Anthraquinones from Cell Suspension Culture of Morinda elliptica

Jasril, Jasril,Lajis, N.H.,Abdullah, M.A.,Ismail, N.H.,Ali, A.M.,Marziah, M.,Ariff, A.B.,Kitajima, M.,Takayama, H.,Aimi, N. The Korean Society of Pharmacognosy 2000 Natural Product Sciences Vol.6 No.1

The chemical investigation on the cell suspension culture of Morinda elliptica L. yielded eight anthraquinones, two of which, anthragallol-1,2-dimethyl ether (3) and purpurin-1-methyl ether (4), have not been isolated from the original plant. Other compounds isolated include nordamnacanthal (1), alizarin-1-methyl ether (2), rubiadin (5), soranjidiol (6), $lucidin-{\omega}-methyl$ ether (7), and morindone (8). The structures of anthraquinones were established based on spectral studies.

Synthesis and Characterisation of Dual Z-Scheme V2O5/g-C3N4 Photocatalysts for Degrading Ciprofloxacin Antibiotics Under Visible Light

Sohaimi Khairunissa Syairah Ahmad,Jaafar Juhana,Dharma Hadi Nugraha Cipta,Samuel Ojo,Ismail A. F.,Othman M. H. D.,Rahman Mukhlis A.,Aziz F.,Salleh W. N. W. 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.3

In this research, an innovative Z-scheme vanadium pentoxide (V 2 O 5 )/graphitic carbon nitride (g-C 3 N 4 ) photocatalyst was synthesised using a facile thermal treatment method, and its photodegradation performance and physicochemical properties were evaluated. The heterostructure provided high Brunauer–Emmett–Teller surface area and pore volume, which encouraged charge carrier separation and transfer, as well as supplied abundant micro-mesoporous structures and active sites for photocatalytic redox reactions. The successful incorporation of V 2 O 5 between g-C 3 N 4 layers can be proven by proposing the synthesis mechanism, as well as conducting morphology, crystal structure, elemental, and chemical analysis through scanning electron microscopy, X-ray diff raction, energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy, respectively. Using these combined photocatalysts, ciprofl oxacin (CIP) was successfully degraded up to 90.17% removal effi ciency in the visible-light spectrum. The superior photocatalytic activity of g-C 3 N 4 composite over V 2 O 5 is primarily due to its increased light absorption capacity, as well as increased surface area, pore size, and volume, eff ective charge transfer, and optimal band alignment between g-C 3 N 4 and V 2 O 5 . This research provides a signifi cant future perspective for the utilisation of Z-scheme V 2 O 5 /g-C 3 N 4 heterojunction photocatalyst for water treatment, especially those involving endocrine-disrupting compounds and antibiotics like CIP.

Optimization of Several Environmental Factors to Human Performance by Using Taguchi Method

Ismail, A.R.,Haniff, M.H.M.,Yusof, M.Y.M.,Rahman, M.N.A.,Ghani, J.A. Korean Institute of Industrial Engineers 2010 Industrial Engineeering & Management Systems Vol.9 No.2

The objective of this study is to determine the dominance effects of environmental factors such as Illuminance, humidity and Wet Bulb Globe Temperature (WBGT) on the operators' productivity at Malaysian electronic industry. A case study was carried out at an electronic components assembly factory. The environmental factors examined were the Illuminance (lux), humidity and WBGT of the surrounding workstation area. Two sets of representative data including the illuminance, humidity and WBGT level and production rate were collected during the study. The production rate data were collected through observations and survey questionnaires while the illuminance level was measured using photometer model RS 180-7133, the humidity and WBGT level were measured by using Quest Temp apparatus and humidity. Taguchi Method was utilized to find the sequence of dominant factors that contributed to the productivity of operator at that specified production workstation. The study reveals that the dominant factor contributed to the productivity was WBGT, followed by illuminance and humidity.

Optimization of Several Environmental Factors to Human Performance by Using Taguchi Method

A. R. Ismail,M. H. M. Haniff,M. Y. M. Yusof,M. N. A. Rahman,J. A. Ghani 대한산업공학회 2010 Industrial Engineeering & Management Systems Vol.9 No.2

The objective of this study is to determine the dominance effects of environmental factors such as Illuminance, humidity and Wet Bulb Globe Temperature (WBGT) on the operators" productivity at Malaysian electronic industry. A case study was carried out at an electronic components assembly factory. The environmental factors examined were the Illuminance (lux), humidity and WBGT of the surrounding workstation area. Two sets of representative data including the illuminance, humidity and WBGT level and production rate were collected during the study. The production rate data were collected through observations and survey questionnaires while the illuminance level was measured using photometer model RS 180-7133, the humidity and WBGT level were measured by using Quest Temp apparatus and humidity. Taguchi Method was utilized to find the sequence of dominant factors that contributed to the productivity of operator at that specified production workstation. The study reveals that the dominant factor contributed to the productivity was WBGT, followed by illuminance and humidity.

Synthesis and Biological Evaluation of Novel Imidazolone Derivatives as Potential COX-2 Inhibitors

Hassanein, Hassanein H.,Maha, M. Khalifa,El-Samaloty, Ola N.,El-Rahim, Mohamed Abd,Taha, Ragia A,Magda, M.F. Ismail 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.5

Three novel series of 2-(substituted phenyl)-4-(substituted arylidene)-imidazolone-5-(4H)-ones were derived from the corresponding oxazolones by condensation with different arylamines. Eleven of the synthesized compounds were selected and evaluated for their effect on carrageenan-induced rat paw edema. Compound 4b had the same efficacy as the reference standard (indomethacin), and compounds 3b, 3c, 4a, 4d and 9a showed good to excellent activities, with other compounds only weakly active. The potent compounds were evaluated for their inhibitory activities against COX-2-catalyzed $PGE_2$ production, with 4a, 4b and 3c showing strong inhibitory activity.

Synthesis and characterization of fish scales of hydroxyapatite/ collagen–silver nanoparticles composites for the applications of bone filler

Mudhafar Mustafa,Zainol Ismail,Alsailawi H. A.,Aiza Jaafar C. N. 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.2

The most implanted tissue after blood is a bone, which consists of collagen and hydroxyapatite as the major components. Collagen is a nature-based polymer that is available in skin and tendons, whereas hydroxyapatite is a natural ceramic that is available abundantly in teeth. The composites of hydroxyapatite/collagen (HA/Col) have been reported to be the most encouraging bone graft because of the likenesses with the natural bones. Furthermore, the integration of the nano silvers in the composites’ matrix has been predicted to lead to antimicrobial reactions. This study combined the natural fi sh scales hydroxyapatite (FsHAp), fi sh scale collagen (FsCol), and nanosilver (Ag) to develop the composites of FsHAp/FsCol/nAg with various ratios of content. FTIR, XRD, EDX, and SEM were employed to identify the chemical structure and morphology of the tested composites. Similar processes were conducted to study the swelling ratio, biostability, and antibacterial features of the composites. The cytotoxicity of the FsHAp/FsCol/AgNPs composites was evaluated using Alamar blue assay. The outcome revealed that 80:20 of the HA/Col composite showed higher stability than other ratio compositions. The morphology of the composites demonstrated a homogeneous surface with nanosilvers scattered evenly in the matrix. Additionally, the activities of the antimicrobial in the composites were found against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ). For the cytotoxicity study, the composites showed non-toxic eff ects on MG-63 human cells at high concentrations.

The Technique of Voltage Level Time Division Based on Maximum Pulse Width to Reduce Total Harmonic Distortion on Multilevel Transformerless Photovoltaic Inverter (MLTPVI) System

Irwanto M.,Gomesh N.,Irwan Y. M.,Ismail B.,Leow W. Z.,Hardi S.,Saleh K.,Alam H.,Suwarno 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.3

An inverter is an important component used to generate alternating current (AC). One of the most common types is the multilevel inverter (MLI), which generates an AC multilevel voltage waveform. This device is designed from a simple topology with the power switching components in the full-bridge circuit connected in a series connection. The circuit consists of a total harmonic distortion (THD), voltage total harmonic distortion (VTHD), and current total harmonic distortion (CTHD). However, creating a suitable MLI technique capable of generating AC multilevel voltage waveform to achieve the lowest harmonic is one of the problems commonly faced. Therefore, this research aims to design a voltage level time division based on maximum pulse width to reduce THD on a multilevel transformerless photovoltaic inverter (TPVI) system. The direct current supplied to this is from the photovoltaic (PV) module. This research also aims to generate the phase delay time and pulse width of waves by proposing a division factor, n, proposed through mathematical modeling and simulated using SIMULINK Matlab. The results showed that the modeled PV is valid to the datasheet, therefore, it is suitable to supply the 11-level TPVI system. Furthermore, the proposed technique has the ability to generate the AC 11-level voltage waveform with diff erent division factors, n . The lowest VTHD and CTHD are achieved at values of 8, respectively.