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Safia Syazana Mohtar,Norasikin Saman,Ahmad Mujahid Md Noor,Tengku Nur Zulaikha Tengku Malim Busu,Nor Aida Yusoff,Hanapi Mat 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.5
Flocculation kinetics and sludge dewatering of kaolin suspension as influenced by various q-EFBC flocculant dosing were studied. In this study, 62.5mg L1 q-EFBC exhibited the highest turbidity removal efficiency of 99.53± 0.08%. The adsorption rate of kaolin towards 12.5mg L1 to 112.5mg L1 q-EFBC dosing increased rapidly for t<60 s and became gradual before completion. The mass transfer coefficient was independent of dosage. The experimental data best-fitted the non-linear pseudo-first order due to the R2>0.99 and the lowest standard deviation. The highest rate constant of particle aggregation and breakage was consistent with the highest rate constant of particle collision, which led to the highest turbidity removal at the optimal dosage. The rate-limiting steps in the flocculation process were particle collision and aggregation since their rate constant was lower than the other kinetic constants. The lower values of SRF and TTF of treated sludge as compared to the untreated one confirmed the improvement in the dewaterability characteristic. The lowest TTF (37.44±1.44 s) and SRF (1.49×1010 m kg1) was observed for 62.5mg L1 q-EFBC. The high turbidity removal and improved sludge dewaterability indicate the potential application of q-EFBC for water 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.
Norasikin Saman,Helen Kong,Safia Syazana Mohtar,Khairiraihanna Johari,Azmi Fadziyana Mansor,Onn Hassan,Noorhalieza Ali,Hanapi Mat 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.7
The adsorption dynamics of inorganic mercury, Hg(II) and organic methylmercury, MeHg(II) removal by low-cost reactive agrowaste adsorbents namely CP-Pure, CP-MPTES and CP-RR was investigated in a fixed-bed adsorber. The results show that the breakthrough and saturation times were delayed with decreasing flow rate (F) and initial concentration (Co), and increasing bed height (Z). The Hg(II) possessed better adsorption performance than MeHg(II). The isotherm and kinetic model analyses of adsorption data followed the Temkin isotherm and the pseudosecond order kinetic models, respectively. The breakthrough curve was simulated well by the Thomas and Yoon-Nelson models, and then was further used for scale-up studies. The empty bed contact time (EBCT) concept was successfully demonstrated for the adsorber design and scale-up studies. The regeneration studies showed that the regenerated CP-Pure and CP-MPTES have a high regeneration efficiency up to third adsorption cycle
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.
Norasikin Saman,Gamal Abdulaziz Mohammed Alaghbari,Safia Syazana Mohtar,Helen Kong,Khairiraihanna Johari,Noorhalieza Ali,Hanapi Mat 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.4
Pure silica nanocapsules (SiNC-P) and elemental sulfur-encapsulated silica nanocapsules (SiNC-ES) as Ag(I) adsorbents were successfully synthesized by a one-step water-in-oil microemulsion polymerization process. The characterization of the synthesized materials, such as surface morphology, surface area, porosity, functional groups and thermal characteristics, was carried out using various analytical techniques. The SiNC-P and SiNC-ES have nearly similar morphology, but the surface area and pore size of the SiNC-ES are higher than SiNC-P. The Ag(I) adsorption study showed that it increased with increasing elemental sulfur (ES) amount in the SiNC-ES. The SiNC-ES shows high adsorption capacity, independent of pH, and higher adsorption rate as compared to SiNC-P. The maximum Ag(I) adsorption capacity of SiNC-P and SiNC-ES was 50.49mg g1 and 98.51mg g1, respectively. The adsorption isotherm data were best described by the Langmuir model. The diffusion modeling analysis of the kinetic data indicated that film diffusion is the controlling step, while chemical reaction modeling obeys the pseudo-second-order kinetic model. The SiNC-ES was reusable and good adsorption performance up to four adsorption cycles was observed. The practical capability of the SiNC-ES to adsorb Ag(I) was successfully demonstrated using an industrial waste solution in which a high removal efficiency was observed (>90%). This demonstrates that the SiNC-ES can be a potential adsorbent for Ag(I) recovery from industrial wastes.