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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.
Nor Azureen Mohamad Nor,Mohamad Azuwa Mohamed,Juhana Jaafar 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
The fuel cell application is an imperative energy conversion transformation with impressive potential forMalaysian future vitality. The relatively small market of fuel cell technology in Malaysia, causing considerabledevelopment in the domestic market, should be created to ensure a noteworthy contribution toMalaysia’s energy industry. Currently, the research towards advanced polymer electrolyte membranesthat can provide high proton conductivity and good durability is actively being studied. This articlereviews the promising properties of polyphenylsulfone (PPSU) polymer materials as proton exchangemembranes. This alternative polymer material would be best to replace the costly and counter the drawbacksof the perfluorinated membranes in fuel cell systems. Unfortunately, the interconnected hydrophilicchannels of PPSU polymers are not well developed as the Nafion membrane. Thus, the PPSU wasmodified by a sulfonation reaction to confer their protonic conduction properties. In addition, the modificationof the highly sulfonated PPSU by thermal crosslinking as a potential technique to improve themechanical and chemical durability of the PPSU was discussed. Further, the effect of mixing various additivesto develop the PPSU nanocomposite membrane on proton conductivity, physicochemical properties,mechanical properties and fuel cell performance are also discussed in this work.
Gishedaraankumar Krishnan,Safia Syazana Mohtar,Farhana Aziz,Juhana Jaafar,Norhaniza Yusof,Wan Norharyati Wan Salleh,Ahmad Fauzi Ismail 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.12
The CO2 gas separation performance of aminated reduced graphene oxide (A-rGO) incorporated PEBAX mixed matrix composite membranes, by means of amination heating time and A-rGO loading, is reported. The 5 h of heating time resulted in an essential molecular sieving property for CO2 separation, thus used in membrane fabrication. The selective PEBAX/A-rGO5 layers were fabricated on top of the polysulfone supporting layer by a dip-coating method. The A-rGO was well-dispersed, the selective and support layers were seamlessly attached. The CO2 permeability and CO2/N2 selectivity of the PEBAX/A-rGO5 was greater than that of pristine PEBAX. 3wt% of A-rGO5 loading resulted as the optimum since the gas selectivity decreased at higher loading. The PEBAX/A-rGO5 performance, which was slightly above the Robeson 2008 upper bound of permeability-selectivity relation for CO2/N2 gas separation, shows a promising application for industrial CO2 gas separation process.
Faten Ermala Che Othman,Norhaniza Yusof,Hasrinah Hasbullah,Juhana Jaafar,Ahmad Fauzi Ismail,Norfadhilatuladha Abdullah,Nik Abdul Hadi Md Nordin,Farhana Aziz,Wan Norharyati Wan Salleh 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.51 No.-
PAN-based ACNFs incorporated with MgO was prepared by electrospinning process followed byappropriate activation process. The addition of MgO caused physicochemical changes in term of smallerfiber diameter with an average diameter of 520 nm and higher surface area which is up to four times(1893 m2 g 1) as compared to pristine ACNFs (478 m2 g 1). Moreover, the modified ACNFs possessed abetter adsorption capacity with higher CH4 adsorption of 2.37 mmol g 1. From the experimental data, theadsorption of CH4 by composite ACNFs obeyed the pseudo-second order kinetic model with R2 value up to0.9996 and bestfitted by Freundlich isotherm model.
Badrut Tamam Ibnu Ali,Cininta Nareswari,Triyanda Gunawan,Nurul Widiastuti,Yuly Kusumawati,Juhana Jaafar,Hens Saputra,Dety Oktavia Sulistiono 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
Polyethylene terephthalate (PET) is a widely used polymer in packaging products, leading to the daily disposalof millions of PET bottles as waste. 1.1 to 8.8 million tonnes of plastic waste enter the sea each year. The environmental challenge of non-biodegradable PET waste can be addressed by utilizing it as a thinlayermembrane for gas separation. This study modified the PET membrane by blending it with Pebaxpolymer and adding zeolite as a filler to enhance its performance. Characterization techniques, includingFTIR, SEM, TGA, tensile strength testing, and contact angle measurements, were performed on all modifiedmembranes. The membranes were prepared using phase inversion via immersion precipitation. Theresults showed that the PET waste membrane had a denser surface pore morphology and asymmetricalcross-sectional pores than other membranes. Adding Pebax and zeolite resulted in a more regularsponge-like pore structure. The PET, PET-Pebax, and PET-Zeolite NaY-Pebax membranes exhibited hydrophilicproperties, as indicated by contact angle values ranging from 48-78. Regarding CO2/CH4 separation,the 9% PET-Pebax membrane had the highest CO2 permeability, a 21% increase from the originalPET waste membrane. Adding zeolite to the 9% PET-Pebax membrane increased CO2 permeability to1044%.
Mohamad Azuwa Mohamed,M. F. M. Zain,Lorna Jeffery Minggu,Mohammad B. Kassim,Juhana Jaafar,Nor Aishah Saidina Amin,Mohd Sufri Mastuli,Hao Wu,Roong Jien Wong,Yun Hau Ng 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
The in-situ hierarchical heterojunction photocatalyst consists of C-doped g-C3N4 (CCN) grafted on the C, Nco-doped ZnO were successfully realized via simple bio-template hydrothermal approach. The resultantshierarchical heterojunction photocatalyst exhibited excellent UV to the near infrared absorptioncapability. The electrochemical analysis and photoluminescence spectroscopy revealed that thehierarchical heterojunction photocatalyst possessed excellent charge generation and separationefficiency. The resultant hierarchical heterojunction photocatalyst exhibited remarkable photocatalyticperformance in the photodegradation of bisphenol A and photocatalytic hydrogen evolution undersimulated solar irradiation. The enhancement of photocatalytic performance was mainly attributed tothe combined effect of hierarchical morphology, in-situ doping, and heterojunction formation.
Che Othman Faten Ermala,Ismail Mohd Shafri,Yusof Norhaniza,Samitsu Sadaki,Yusop Mohd Zamri,Tajul Arifin Nur Fatihah,Alias Nur Hashimah,Jaafar Juhana,Aziz Farhana,Wan Salleh Wan Norharyati,Ismail Ahmad 한국탄소학회 2020 Carbon Letters Vol.30 No.5
The present work focused on the determination of texture, morphology, crystallinity, and gas adsorption characteristics of porous graphene prepared from rice husks ashes at diferent stabilization temperature. The stabilization temperature applied in this work is 100 °C, 200 °C, 300 °C, and 400 °C to convert rice husk into rice husk ashes (RHA). Chemical activation was adopted at temperature 800 °C using potassium hydroxide (KOH) as dehydrating agent at (1:5) impregnation ratio to convert RHA into rice husk ashes-derived graphene (GRHA). The resultant GRHA were characterized in terms of their morphologi�cal changes, SSA, crystallinity, and functional group with TEM, the BET method, Raman spectroscopy, and XRD analysis, respectively. Results from this study showed that the SSA of the GRHA at stabilization temperature 200 °C (1556.3 m2 /g) is the highest compared to the other stabilization temperature. Raman spectroscopy analysis revealed that all GRHA samples possess D, G, and 2D bands, which confrm the successful synthesis of the rice husks into porous graphene-like materials, known as GRHA. Appearance of difraction peak in XRD at 44.7° indicating the graphitic structure of all the GRHA sam�ples. Meanwhile, the TEM images of GRHA200 exhibited wrinkled structures due to the intercalation of oxygen and a few layers of graphene fakes. These wrinkled structures and graphene layers are the other factors that lead to the highest SSA of GRHA200 compared to other prepared samples GRHA. Furthermore, the adsorption capacity of CH4 for GRHA200 is up to 43 cm3 /g at 35 bar and ambient temperature, almost double the adsorption capacity performance of GRHA400 at the same operating pressure and temperature.
Mohd Ridhwan Adam,Mohd Hafiz Dzarfan Othman,Siti Hamimah Sheikh Abdul Kadir,Muthia Elma,Tonni Agustiono Kurniawan,Ahmad Fauzi Ismail,Mohd Hafiz Puteh,Azeman Mustafa,Mukhlis A. Rahman,Juhana Jaafar,Hud 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.4
This work investigates the effectiveness of ammoniacal nitrogen (NH4 +-N) removal from contaminated water by adsorptive hollow fiber ceramic membrane (HFCM) derived from naturally made clinoptilolite. The technological value of this work is the simple mechanism of the adsorptive HFCM in removing gaseous ammonia in water by combining adsorption and separation. To test the technical feasibility of this proposed technology, clinoptilolite HFCM was fabricated via phase inversion-based extrusion/sintering technique and characterized by SEM and water permeation flux. The produced HFCM corresponds to the desired morphology of the asymmetric structure (dense and void formations) with outstanding adsorption performance of NH4 +-N. The effects of the HFCM’s operational parameters on its removal are examined in terms of membrane dosage and isothermal studies. The adsorption isotherm behavior exhibited that the adsorption process fitted the Freundlich isotherm model with outstanding removal performance even at trace concentration of ammonia. The low amount used by HFCM (4.75×104m2) resulted in over 96% ammonia removal, indicating a low cost of adsorption process. The regeneration of saturated HFCM suggests an outstanding recovery of the HFCM for its subsequent use for NH4 +-N removal. This study also reveals the potential of adsorptive HFCM as a simple and cost-effective technology for ammonia removal from wastewater.
Muhd Arif Aizat Marhalim,Safia Syazana Mohtar,Abdussamad Mukhtar Mohammed,Farhana Aziz,Mohd Nazri Mohd Sokri,Wan Norharyati Wan Salleh,Norhaniza Yusof,Juhana Jaafar,Ahmad Fauzi Ismail,Madzlan Aziz,Ros 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.8
New lanthanum orthoferrite (LaFeO3)/chitosan nanocomposites were synthesized with different chitosan loadings (15 and 35%). Their adsorptive photocatalytic activity in the removal of Reactive Black 5 (RB5) was studied by manipulating the pH of the RB5 solution (pH 3, pH 6, pH 9), the catalyst loading (1 g L1, 2 g L1, and 3 g L1), and the initial concentration of RB5 (30mg L1, 50mg L1, and 70 mg L1) under 100W LED light. The nanocomposites have a nanocrystalline structure similar to LaFeO3 with a lower SBET and PV but a higher PR. The LaFeO3 was distributed well on chitosan matrices with variations in the elemental composition. The band gap was gradually decreased with increased chitosan loading. The nanocomposite with 15% chitosan loading (LC15) resulted as the most prominent photocatalyst with the highest removal of RB5 up to 98.5% under experimental conditions of pH 6, 2 g L1 of catalyst loading, and 30mg L1 of initial RB5 concentration. The LC15 showed good stability, wherein the degradation efficiency was more than 90% after the fifth cycle with no significant change in the chemical properties. This work provides a technique to improve the removal of recalcitrant dyes through the processing of adsorptive photocatalysis utilizing adsorbent and perovskite.