Microwave induced synthesis of magnetic biochar from agricultural biomass for removal of lead and cadmium from wastewater

M.W. Yap,N.M. Mubarak,J.N. Sahu,E.C. Abdullah 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.45 No.-

The novel magnetic biochar (MB) has been successfully synthesized by using the microwave technique,using discarded materials such as coconut shell (CS). The optimized conditions for the best novelmagnetic biochar synthesis are at 800 W reaction power, 20 min reaction time, and 0.5 g (FeCl3:biomass)impregnation ratio. The detailed physical and chemical analyses of novel magnetic biochar were found tobe in good agreement with the hypothesis. These newly produced magnetic biochars have high surfacearea of 834 m2/g and this leads to high efficiency in the removal of cadmium and lead from wastewater. The results revealed that magnetic biochar composite exhibited excellent ferromagnetic property with asaturation magnetization of 6 emu/g. As for new invention, the magnetic biochar can be directlyproduced using microwaves heating by single stage of activation compared to the conventional method.

Classification of Algae Plant Using Deep Learning

Abdullah,Ali Sikandar,Ali Hussain,Ali Athar,M. Mohsin,Hee-Cheol Kim 한국정보통신학회 2022 2016 INTERNATIONAL CONFERENCE Vol.13 No.1

A review on thermochemical seasonal solar energy storage materials and modeling methods

ABDULLAH,Koushaeian M.,Shah N. A.,정재동 대한설비공학회 2024 International Journal of Air-Conditioning and Refr Vol.32 No.1

In the current era, national and international energy strategies are increasingly focused on promoting the adoption of clean and sustainable energy sources. In this perspective, thermal energy storage (TES) is essential in developing sustainable energy systems. Researchers examined thermochemical heat storage because of its benefits over sensible and latent heat storage systems, such as higher energy density and decreased heat loss. Solar energy is a promising alternative among the numerous renewable energy sources. As a result, this study provides an overview of thermochemical heat storage materials, focusing on materials utilized by solar energy systems in buildings. The research examines the storage materials used in relevant studies and the models used to predict and enhance system performance.

A review on thermochemical seasonal solar energy storage materials and modeling methods

ABDULLAH,Koushaeian M.,Shah N. A.,정재동 대한설비공학회 2024 International Journal of Air-Conditioning and Refr Vol.32 No.1

In the current era, national and international energy strategies are increasingly focused on promoting the adoption of clean and sustainable energy sources. In this perspective, thermal energy storage (TES) is essential in developing sustainable energy systems. Researchers examined thermochemical heat storage because of its benefits over sensible and latent heat storage systems, such as higher energy density and decreased heat loss. Solar energy is a promising alternative among the numerous renewable energy sources. As a result, this study provides an overview of thermochemical heat storage materials, focusing on materials utilized by solar energy systems in buildings. The research examines the storage materials used in relevant studies and the models used to predict and enhance system performance.

A symmetric benzoselenadiazole based D–A–D small molecule for solution processed bulk-heterojunction organic solar cells

Abdullah,M. Shaheer Akhtar,Eun-Bi Kim,Lamiaa Fijahi,Hyung-Shik Shin,Sadia Ameen 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-

Benzoselenadiazole as the central acceptor unit with terminal donor unit of n-hexylbithiophene waschosen to design the symmetric donor-acceptor-donor (D–A–D) configuration based small organicchromophore, 4,7-bis(50-hexyl-[2,20-bithiophen]-5-yl)benzo[c][1,2,5]selenadiazole, RTh-BSe-ThR, forthe fabrication of solution-processed bulk-heterojunction organic solar cells (BHJ-OSCs). RTh-BSe-ThRchromophore showed assuring solubility in common organic solvents and exhibited wider absorption inthe visible region with an optical band gap (Egopt) of1.87 eV. Benzoselenadiazole unit with two nhexylbithiopheneunits exhibited an excellent electrochemical behavior with the highest occupiedmolecular orbital (HOMO) of5.38 eV and the lowest unoccupied molecular orbital (LUMO) of3.51 eV. The fabricated BHJ-OSCs with RTh-BSe-ThR:PC61BM (1:3, w/w) blend thinfilm displayed a powerconversion efficiency (PCE) of3.46% and a high value of short circuit current density (JSC) of11.20 mA/cm2. The enhancement in the photovoltaic parameters might be attributed to the significantimprovements in the interfacial area of bulk heterojunction which might enhance the light harvestingproperty and the shunt resistance of the blend thinfilms.

Potential of Activated Carbon Derived from Local Common Reed in the Refining of Raw Cane Sugar

Ibrahim D-Abdullah,Badie S. Girgis,Yassin M. Tmerek,Elsaid H. Badawy 한국탄소학회 2010 Carbon Letters Vol.11 No.3

Common reed (Fragmites australis), a local invasive grass, was investigated as a possible feedstock for the production of activated carbon. Dried crushed stems were subjected to impregnation with phosphoric acid (30, 40 and 50%) followed by pyrolysis at 400~500℃ with final washing and drying. Obtained carbons were characterized by determining: carbon yield, ash content, slurry pH, textural properties and capacity to remove color bodies from factory-grade sugar liquor. Produced carbons possessed surface area up to 700 m2/g, total pore volumes up to 0.37 cm3/g, and proved to be microporous in nature. Decolorization of hot sugar liquor at 80℃ showed degrees of color removal of 60 up to 77% from initial color of 1100~1300 ICU, at a carbon dose of 1.0 g/100 ml liquor. No correlation seems to hold between synthesis conditions and % R but depends on the degree of microporosity. A commercial activated carbon N showed a comparative better color removal capacity of 91%. Common reed proved to be a viable carbon precursor for production of good adsorbing carbon suitable for decolorization in the sugar industry, as well as in other environmental remediation processes.

Evaluation of Wheat Genotypes for Salt Tolerance Based on Some Physiological Traits

Abu Hasan,Hafizur Rahman Hafiz,Nurealam Siddiqui,M. Khatun,Rabiul Islam,Abdullah -Al Mamun 한국작물학회 2015 Journal of crop science and biotechnology Vol.18 No.5

Identification of physiological markers related with salt tolerance during various vegetative and reproductive stages is crucial for evaluating wheat genotypes and improving their salt tolerance. Two salt-tolerant (Shatabdi and BAW 1135) and two salt-sensitive (BARI Gom 26 and BAW 1122) wheat genotypes of Bangladesh were grown in three salinity levels (control, 6 dS m-1, and 12 dS m-1) to observe the sensitivity of some physiological traits.. Salt-tolerant wheat genotypes maintained lower levels of leaf Na, higher levels of leaf K, and greater K/Na ratios in saline conditions than the sensitive one. Due to salt stress, flag leaf proline content was increased in salt-tolerant wheat genotypes whereas the proline level was decreased in the sensitive one compared to the control. Salt-sensitive genotypes showed a greater increment in SPAD (relative chlorophyll content) value at moderate salt stress but a greater reduction in SPAD values at high salt stress than tolerant ones. Salt-sensitive genotypes were affected more in their straw yield and finally grain yield plants-1 under saline conditions than salt-tolerant genotypes. There was a highly significant negative correlation between grain yield and Na content and also a highly significant negative correlation between grain yield and K : Na content of the wheat genotypes under saline environments. We also observed stress susceptibility index (SSI) based on grain yield plant-1 the order of tolerance was BAW 1135 > Shatabdi > BARI Gom 26 > BAW 1122 at moderate salinity level and BAW 1135 > Shatabdi > BAW 1122 > BARI Gom 26 at high salinity

Phylogenetic Relationships of the Mutualistic Fungi Associated with Macrotermes subhyalinus in Oman

Hilal S. AlShamakhi,Abdullah M. Al-Sadi,Lyn G. Cook 한국균학회 2023 Mycobiology Vol.51 No.5

The symbiotic association between fungus-gardening termites Macrotermes and its fungalsymbiont has a moderate degree of specificity—although the symbiotic fungi (Termitomyces)form a monophyletic clade, there is not a one-to-one association between termite speciesand their fungus-garden associates. Here, we aim to determine the origin and phylogeneticrelationships of Termitomyces in Oman. We used sequences of the internal transcribed spacerregion (ITS) and the nuclear large subunit ribosomal RNA (LSU rRNA, 25S) gene and analyzedthese with sequences of Termitomyces from other geographic areas. We find no evidence formore than a single colonization of Oman by Termitomyces. Unexpectedly, we findTermitomyces in Oman is most closely related to the symbiont of M. subhyalinus in WestAfrica rather than to those of geographically closer populations in East Africa.

Fuel Cell Based on Novel Hyper-Branched Polybenzimidazole Membrane

Changzhi Liu,Sher Bahadar Khan,이민주,김광인,Kalsoom Akhtar,한학수,Abdullah M. Asiri 한국고분자학회 2013 Macromolecular Research Vol.21 No.1

A novel hyper-branched polybenzimidazole (HB-PBI) has been synthesized and efficiently utilized as a conducting polymer for the fabrication of an efficient high temperature fuel cell. The developed fuel cell showed outstanding proton conductivity (0.168 Scm-1 at 150 ºC) along with excellent single cell performance, displaying a maximum power density of 0.346 Wcm-2. The HB-PBI has been synthesized by polymerization of bibenzimidazole diterephthalic acid (BBIDTA) and 3,3'-diaminobenzene in the presence of poly phosphoric acid while the BBIDTA was synthesized by treating trimellitic anhydride with 3,3'-diaminobenzene. Both HB-PBI and BBIDTA were structurally characterized by nuclear magnetic resonance (1H and 13C NMR). HB-PBI showed high thermal stability and mechanical properties, findings that were corroborated by thermogravimetric analysis and use of a universal testing machine. Additionally, proton conduction and the thermal and mechanical properties of HB-PBI were compared with polybenzene imidazole (m-PBI), and found that HB-PBI has higher proton conducting, thermal and mechanical properties.

Studies of methanol electro-oxidation with ternary wet-chemically prepared ZCSO hexagonal nanodiscs with electrochemical approach

Mohammed M. Rahman,M.M. Alam,Abdullah M. Asiri,Sulaiman Y. M. Alfaifi,Hadi M. Marwani 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-

High performance acute toxic methanol sensor based on hydrothermally prepared hexagonal nanodiscs(NDs) of ZnO/CdO/SnO2 (ZnCdSnO2 or ZCSO) was fabricated onto glassy carbon electrode (GCE). The characterizationof ZCSO NDs in-terms of functional group analysis, binding energy evaluation, oxidationstates, optical absorbance, crystallinity, structural morphology, and elemental compositions were performedby FTIR spectroscopy, X-ray photoelectron spectroscopy (XPS), UV–visible spectroscopy, XRD,FESEM-coupled-EDS analysis respectively. The current versus concentration plot was exhibited linearon a wide range of methanol concentration (0.01 nM to 0.1 mM) clarified as linear dynamic methanoldetection range (LDR). Considering the ZCSO NDs-coated surface area onto GCE over the slope of LDR,noticeable methanol sensor sensitivity (4.5475 mA mM1 cm2) was perceived. Besides this, a considerablelower limit (7.69 ± 0.38 pM) of detection at signal/noise = 3 is obtained. The overall results of methanolchemical sensor were found with satisfactory and acceptable results in terms of their reproducibility,sensitivity, stability, and response-time. Additionally, the assembled ZCSO NDs-coated electrode was validatedwith real environmental samples and result was found good and acceptable. On considering theoutcome of applicability and the way of this sensor assembling, this unique method might be a potentialtechnique in the field of portable sensor development for the safety of environmental and healthcarefields in a broad scale.