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이송우,Wan Mohd Ashri Wan Daud,이민규 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.6
The influence of surface modification of activated carbon on the adsorption of methyl mercaptan (MM),dimethyl disulfide (DMDS), and trimethylamine (TMA) was investigated by treatments with 1N-HNO3solution and 1N-NaOH solution. The surface modifications changed the concentrations of functional groups on the surface of activated carbon. Also, the surface modifications changed breakthrough time and equilibrium adsorption capacity of MM, DMDS, and TMA. The adsorption capacities of MM and DMDS were increased by acid treatment, but decreased by base treatment. On the other hand, the adsorption capacity of TMA was decreased by both acid and base treatments. But the difference ranges of equilibrium adsorption capacities according to acidity and basicity of the surface were relatively small. 2010 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Sulaiman M. Al-Eidi,Ashry Gad Mohamed,Raid A. Abutalib,Abdullah M. AlBedah,Mohamed K.M. Khalil 사단법인약침학회 2019 Journal of Acupuncture & Meridian Studies Vol.12 No.6
To evaluate the feasibility of comparing the effect of the traditional Hijamah and the Asian wet cupping techniques in the management of patients with chronic low back pain (CLBP), a randomized clinical trial comparing traditional and Asian wet cupping techniques for CLBP was conducted in two secondary care hospitals in Saudi Arabia. Seventy eligible participants with CLBP were randomized to receive one session of wet cupping using either Asian technique (34 patients) or traditional Hijamah technique (36 patients). Cupping was performed at four sites of the bilateral bladder meridian (BL23, BL24, and BL25). The numeric rating scale, Present Pain Intensity, and Oswestry Disability Questionnaire scores were measured immediately after intervention, at seven days, and 14 days after intervention. In both groups, there was a significant decrease in the numeric rating scale, Present Pain Intensity, and Oswestry Disability Questionnaire scores, immediately after intervention, at seven days, and 14 days after intervention. However, there was no significant difference between the two groups across all the outcome measures up to 14 days after intervention. The study did not show a superiority of one technique compared with the other. Longer follow-up periods and more than one cupping session may be needed to evaluate the difference, if any, between both the techniques. Trial Registration: NCT02012205.
호다,Pouya Sirous Rezaei,Wan Mohd Ashri Wan Daud 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
Bifunctional metal/acid catalysts of 5 wt% Ni/HBeta, 5 wt% Fe/HBeta, 2.5 wt% Ni-2.5 wt% Fe/HBeta (NiFe-5/HBeta) and 5 wt% Ni-5 wt% Fe/HBeta (NiFe-10/HBeta) were used for hydrodeoxygenation (HDO) of asimulated phenolic bio-oil consisting of phenol (50 wt%), o-cresol (25 wt%) and guaiacol (25 wt%). Nickeland iron metals were supported on hydrogen form Beta zeolite (HBeta) under similar ion-exchangeconditions. BET surface area and acid sites density of Ni/HBeta, Fe/HBeta, NiFe-5/HBeta and NiFe-10/HBeta were 463, 445, 455, 417 m2/g and 0.53, 0.48, 0.50, 0.38 mmol/g, respectively. Cycloalkanes(21.39 wt%) and aromatic hydrocarbons (20.21 wt%) were the dominant hydrocarbons obtained overmonometallic catalysts of Ni/HBeta and Fe/HBeta through reactions of hydrogenation and hydro-genolysis, respectively. It was revealed that both hydrogenation and hydrogenolysis mechanisms wereeffectively proceeded over the bimetallic catalyst of NiFe/HBeta which showed enhanced HDO efficiencycompared to monometallic catalysts of Ni/HBeta and Fe/HBeta due to the synergistic effect between thetwo metals. The effect of reaction temperature on HDO efficiency of NiFe-10/HBeta catalyst wasinvestigated at 220, 260, 300 and 340 8C. Maximum catalytic activity and hydrocarbons selectivity wasobserved at 300 8C. Replacement of water with methanol as solvent in HDO of the simulated phenolicbio-oil over NiFe-10/HBeta remarkably reduced the selectivity towards hydrocarbons.
Review on the main advances in photo-Fenton oxidation system for recalcitrant wastewaters
Shima Rahim Pouran,A.R. Abdul Aziz,Wan Mohd Ashri Wan Daud 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
This paper reviews themain advances in photo-Fenton oxidation treatment for recalcitrant wastewaters. This oxidation method is able to produce biodegradable intermediates and mineralize such pollutantseffectively when the main operational conditions are at optimum level. However, cost of the process isone of the main limitations. Several strategies have been put in practice to minimize cost and improvephoto-Fenton efficiency primarily through application of heterogeneous catalysts and/or chelatingagents. In addition, cost can be further reduced by applying solar energy and integrating biologicaltreatment technologies in the treatment process.
Roozbeh Hoseinzadeh Hesas,Arash Arami-Niya,Wan Mohd Ashri Wan Daud,J.N. Sahu 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
Activated carbon (AC) was prepared from oil palm shell using different ratios of KOH as an activation agent and various microwave irradiation powers. To study the effects of physical agents, the impregnated precursors were activated under a flow of CO2 or N2. Maximum BET surface areas of 1196 and 1630 m2/g were achieved in the presence of CO2 and N2, respectively. The textural properties of the samples with the highest surface areas were investigated using ultimate and proximate analyses, SEM and FTIR. The CO2 adsorption results suggest that the ACs are promising adsorbents for gas separation or storage applications.
Modification of Activated Carbon Using Nitration Followed by Reduction for Carbon Dioxide Capture
Mohammad Saleh Shafeeyan,Amirhossein Houshmand,Arash Arami-Niya,Hosain Razaghizadeh,Wan Mohd Ashri Wan Daud 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.2
Activated carbon (AC) samples were modified using nitration followed by reduction to enhance their CO2 adsorption capacities. Besides characterization of the samples, investigation of CO2 capture performance was conducted by CO2 isothermal adsorption, temperature-programmed (TP) CO2 adsorption, cyclic CO2 adsorption–desorption, and dynamic CO2 adsorption tests. Almost all modified samples showed a rise in the amount of CO2 adsorbed when the comparison is made in unit surface area. On the other hand, some of the samples displayed a capacity superior to that of the parent material when compared in mass unit, especially at elevated temperatures. Despite ~65% decrease in the surface area, TP-CO2 adsorption of the best samples exhibited increases of ~10 and 70% in CO2 capture capacity at 30 and 100 °C, respectively.
TiO2 catalyst deactivation in textile wastewater treatment: Current challenges and future advances
Hamisu Umar Farouk,Abdul Aziz Abdul Raman,Wan Mohd Ashri Wan Daud 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.33 No.-
Photocatalytic reactors are not commonplace in treatment of wastewater on a commercial scale. Thiscritical review presents a perspective on how to harness the knowledge gained in areas of mass andphoton transfer limitations via photoreactor intensification processes to prolong TiO2 catalyst life forphoto reactor design. The paper revealed the necessity of TiO2 rational design; considering its surface(rutile and anatase lattices), protonation, water splitting reactions at the TiO2 coordinatively unsaturatedsites (CUS) as the limiting step during photocatalytic reactions adding more knowledge on surfaceinteractions that lead to activity inhibition.
Andrew Ng Kay Lup,Faisal Abnisa,Wan Mohd Ashri Wan Daud,Mohamed Kheireddine Aroua 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.56 No.-
Catalytic deoxygenation is a fundamental process for bio-oil upgrading due to its high oxygen contentwhich will result in lower heating value, corrosion and instability issues. The discovery of an excellentheterogeneous deoxygenation metal catalyst with high deoxygenation activity is a necessarybreakthrough for an optimized bio-oil catalytic deoxygenation. For an effective deoxygenation supportedmetal catalyst, properties such as high H2 sticking coefficient, optimal metal-oxygen bond strength andsuitable acid strength from support are needed to ensure facile scission of C O bonds and activation ofH2 and O-containing compounds. Metals such as Fe, Ru, Sn, W, Zr and supports such as C, TiO2, ZrO2 whichare oxophilic were also observed to enhance direct removal of oxygen from O-containing compounds dueto their high C O and C¼O bond affinities. The choice of support is important to ensure it has optimalphysicochemical properties for facile deoxygenation and the optimal acid strength to enhance C Ohydrogenolysis activity while minimizing coke formation. The choice of metal is dependent on the type ofmodel compound since different metals catalyze different reaction pathways of the deoxygenation ofmodel compounds. This review presents on the use of heterogeneous metal catalysts in thedeoxygenation of bio-oil model compounds through several perspectives which are catalytic properties,reaction conditions, deactivation and regeneration of metal catalysts. In addition, several outlooks on thefeasible range of reaction condition for catalytic deoxygenation and criteria of excellent deoxygenationsupported metal catalysts were also expressed in this article based on the studies on the literatures.
Khan Muhammad Qureshi,Andrew Ng Kay Lup,Saima Khan,Faisal Abnisa,Wan Mohd Ashri Wan Daud 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.9
A series of experiments was conducted to study the effect of temperature and feed rate on physicochemical properties and yield of bio-oil. The experiments were performed in a helical screw fluidized bed reactor and about 150-gram palm shell (PS) was pyrolyzed in each run at 275 oC/min heating rate. The first set of experiments was conducted at temperature ranging from 400 to 650 oC without using any inert gas for fluidization. While the second set of experiments were performed at feed rates ranging from 3 to 25 g/min in order to investigate the effects of feed rate on pyrolytic products. Results showed that the bio-oil yield was increased with the increase in temperature and feed rate due to the enhanced biomass volatilization. In a similar vein to this, a greater extent in oxygenates cracking was also noted in the bio-oil. A maximum liquid yield of about 72.84 wt% was obtained at 500 oC, while 72.92 wt% liquid yield was obtained with 25 g/min feed rate. The HHV of bio-oil was also increased from 38.52 to 43.13 MJ/kg when pyrolysis temperature was increased from 400 to 650 oC.