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Basirun Ain Aqilah,Othman Ahmad Razi,Yasid Nur Adeela,Halmi Mohd Izuan Effendi,Gunasekaran Baskaran,Shukor Mohd Yunus Abd 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.6
Membrane isolation, ion exchange, precipitation, transformation, and biosorption are all viable methods for pollutant removal. Adsorption is a common commercial method to concentrate precious molecules or eliminate contaminants, and it is a cost-effective method of treating industrial wastewater. A novel method for increasing their removal effectiveness has been developed for this purpose, using a low-cost biosorbent made from durian husk and Evans blue (EB) dye as a subject. The EB dye adsorption percentage was determined to be 95.95% with 72.0 mg/g adsorption amount at optimal conditions of pH 2 and 40 °C. The second-order kinetic model fit the experimental data the best. Additionally, the results indicated that the Sips isotherm model fits the experimental data better and that the experiment involved single-layer adsorption on the adsorbent surface. A non-linear regression of the van’t Hoff plot gave negative values of Gibbs free energy (−39.38 to −41.48 kJ/mol) at all the temperatures studied (from 20 to 60 °C), indicating that the adsorption process is spontaneous and feasible. A negative value for the enthalpy (ΔHo=−23.37kJ/mol) indicated that the adsorption was exothermic, and the positive value of (ΔSo=54.55kJ/mol·K) concludes the nature of adsorption of Evans blue dye by Durian husk likely to follow a physisorption adsorption mechanism.
Mat Teridi, Mohd Asri,Sookhakian, Mehran,Basirun, Wan Jefrey,Zakaria, R.,Schneider, Fabio Kurt,da Silva, Wilson Jose,Kim, Jaeyeon,Lee, Seung Joo,Kim, Hyeong Pil,Mohd Yusoff, Abd. Rashid bin,Jang, Jin The Royal Society of Chemistry 2015 Nanoscale Vol.7 No.16
<▼1><▼1><P>High performance organic devices were successfully demonstrated with the presence of highly ordered nanoimprinted Au nanodisks.</P></▼1><▼2><P>High performance organic devices including polymer solar cells (PSCs) and light emitting diodes (PLEDs) were successfully demonstrated with the presence of highly ordered nanoimprinted Au nanodisks (Au NDs) in their solution-processed active/emissive layers, respectively. PSCs and PLEDs were fabricated using a low bandgap polymer and acceptor, nitrogen doped multiwalled carbon nanotubes poly[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-<I>b</I>:4,5-<I>b</I>′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno[3,4-<I>b</I>]-thiophenediyl] (n-MWCNTs:PTB7), and [6,6]-phenyl C71 butyric acid methyl ester (PC71BM) and (4,4-<I>N</I>,<I>N</I>-dicarbazole) biphenyl (CBP) doped with tris(2-phenylpyridine) iridium(iii) (Ir(ppy)3) as active/emissive layers, respectively. We synthesized nitrogen doped graphene and used it as anodic buffer layer in both devices. The localized surface plasmon resonance (LSPR) effect from Au NDs clearly contributed to the increase in light absorption/emission in the active layers from electromagnetic field enhancement, which originated from the excited LSPR in PSCs and PLEDs. In addition to the high density of LSPR and strong exciton-SP coupling, the electroluminescent (EL) enhancement is ascribed to enhanced spontaneous emission rates. This is due to the plasmonic near-field effect induced by Au NDs. The PSCs and PLEDs exhibited 14.98% (8.08% to 9.29%) under one sun of simulated air mass 1.5 global (AM1.5G) illumination (100 mW cm<SUP>−2</SUP>) and 19.18% (8.24 to 9.82 lm W<SUP>−1</SUP>) enhancement in the power conversion efficiencies (PCEs) compared to the control devices without Au NDs.</P></▼2></▼1>
Crystallization behavior of tantalum and chlorine co-substituted hydroxyapatite nanopowders
Bahman Nasiri-Tabrizi,Belinda Pingguan-Murphy,Wan Jefrey Basirun,Saeid Baradaran 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.33 No.-
The crystallization behavior of tantalum and chlorine co-substituted hydroxyapatite nanopowders wasexamined. Results showed that combined processing by mechanical alloying and annealing is conduciveto the structural changes and crystal growth. A series of nanocrystalline tantalum and chlorine cosubstitutedhydroxyapatite (Ta/Cl–HA) with different dopant contents were synthesized as a result ofthe progressive mechanochemical reaction. During the subsequent annealing, crystallization of the asmilledpowders occurred, leading to a significant increase in the fraction of crystalline phase. TEMimages revealed that the crystallized and doped nanopowders composed of crystalline nanoneedles withan average size of 61 26 nm.
Effect of hydrogen gas on the growth process of PbS nanorods grown by a CVD method
Ramin Yousefi,Mohsen Cheraghizade,Farid Jamali-Sheini,Wan Jefrey Basirun,Nay Ming Huang 한국물리학회 2014 Current Applied Physics Vol.14 No.8
PbS nanostructures were grown by sulfuration of two lead sheets in a tube furnace under nitrogen (N2) and argon/hydrogen (Ar/H2) conditions. All conditions, such as the sheet temperature, sulfur powder temperature, and the carrier gas rate, were the same for two samples. Field emission scanning electron microscope (FESEM) images showed that the nanostructures with rod morphology were formed on the sheets. However, the nanorods that were grown under N2 gas, were denser, more compact, and a different shape and size in comparison to another sample. In addition, the nanorods grown under N2 gas exhibited a rectangular shape, while another sample showed nanorods that were tapered. X-ray diffraction (XRD) patterns indicated that these nanorods were PbS with a cubic phase. Furthermore, Raman measurements confirmed the XRD results, and indicated three Raman active modes of PbS phase. The optical characterization results showed a band gap for the PbS nanorods in the infrared region.
M. Mesbah,A. Fattahi,A. R. Bushroa,G. Faraji,K. Y. Wong,W. J. Basirun,A. Fallahpour,B. Nasiri‑Tabrizi 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.2
Ultrafine grained ZK60 magnesium (UFG–ZK60 Mg) tubes were successfully fabricated by a parallel tubular-channel angularpressing (PTCAP) process. The number of pass effects on the phase composition, microstructural features and mechanicalproperties were examined. Also, two types of Artificial Neural Network known as Radial Basis Function (RBF) and Multi-Layer Perceptron (MLP) were employed to accurately estimate mechanical behavior of the PTCAP-processed ZK60 Mgalloy. The results showed that all the processed tubes had more refined microstructure with ~ 7 to 0.9 μm grain sizes, whichconsist of an average crystallite size between 68 ± 8 and 51 ± 8 nm, compared to the as-received specimen with a mean grainsize of ~ 90 μm. Similar XRD profiles were achieved following different PTCAP passes, however, some discrepancies wereobserved as the number of passes increased, which corroborated the structural changes during the PTCAP process. Themicroscopic observations also revealed the microstructural changes by increasing the PTCAP passes. The hardness of theprocessed tubes increased with the number of PTCAP passes, from 77 ± 2 HV for the unprocessed alloy to a maximum of111 ± 2 HV at three PTCAP passes. The PTCAP process increased not only mechanical strength but also the ductility of theprocessed tubes, where the highest yield strength (σYS = 320 MPa), ultimate tensile strength (σUTS = 397 MPa) and elongationto failure (δ = 14%) values were obtained at the second pass of PTCAP. However, with increasing number of PTCAPpasses to three, δ reached 4% and σYS and σUTS decreased by 31% and 11%, respectively. Findings from the neural basedpredictivemodels indicated that both RBF and MLP can be employed for accurately estimating the mechanical propertiesof the PTCAP-processed ZK60 Mg alloy.
Tajabadi, M.T.,Sookhakian, M.,Zalnezhad, E.,Yoon, G.H.,Hamouda, A.M.S.,Azarang, M.,Basirun, W.J.,Alias, Y. New York] ; North-Holland 2016 APPLIED SURFACE SCIENCE - Vol.386 No.-
An efficient non-enzymatic biosensor electrode consisting of nitrogen-doped graphene (N-graphene) and platinum nanoflower (Pt NF) with different N-graphene loadings were fabricated on indium tin oxide (ITO) glass using a simple layer-by-layer electrophoretic and electrochemical sequential deposition approach. N-graphene was synthesized by annealing graphene oxide with urea at 900<SUP>o</SUP>C. The structure and morphology of the as-fabricated non-enzymatic biosensor electrodes were determined using X-ray diffraction, field emission electron microscopy, transmission electron microscopy, Raman and X-ray photoelectron spectra. The as-fabricated Pt NF-N-graphene-modified ITO electrodes with different N-graphene loadings were utilized as a non-enzymatic biosensor electrode for the detection of hydrogen peroxide (H<SUB>2</SUB>O<SUB>2</SUB>). The behaviors of the hybrid electrodes towards H<SUB>2</SUB>O<SUB>2</SUB> reduction were assessed using chronoamperometry, cyclic voltammetry and electrochemical impedance spectroscopy analysis. The Pt NF-N-graphene-modified ITO electrode with a 0.05mgml<SUP>-1</SUP> N-graphene loading exhibited the lowest detection limit, fastest amperometric sensing, a wide linear response range, excellent stability and reproducibility for the non-enzymatic H<SUB>2</SUB>O<SUB>2</SUB> detection, due to the synergistic effect between the electrocatalytic activity of the Pt NF and the high conductivity and large surface area of N-graphene.