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Muhazri Abd Mutalib,Farhana Aziz,Nur Aisyah Jamaludin,Norsyazwani Yahya,Ahmad Fauzi Ismail,Mohamad Azuwa Mohamed,Mohd Zamri Mohd Yusop,Wan Norharyati Wan Salleh,Juhana Jaafar,Norhaniza Yusof 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.2
Perovskite LaFeO3 photocatalyst prepared by using sol-gel glucose method was assembled on graphene oxide sheets to produce integrated photocatalyst-adsorbents (IPCA) and investigated as photocatalyst for the degradation of methylene blue under visible light irradiation. The prepared photocatalyst was characterized by FTIR, XRD, FESEM, BET specific surface area measurement, TEM/HRTEM and UV-Vis spectroscopy analysis. The FTIR, FESEM and TEM analysis has suggested that the photocatalyst LaFeO3 has been successfully embedded at the surface of the graphene oxide (GO) sheets due to a strong interaction between the photocatalyst and the adsorbents matrix. Methylene blue degradation shows that IPCA possesses higher photodegradation kinetics compared to bare LaFeO3 photocatalyst. The resultant photocatalyst also possesses magnetic properties which can overcome the difficulty in recollecting and removal of photocatalyst suspension in water after photocatalytic treatment.
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.
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.
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.
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.