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Surface-tailoring chlorine resistant materials and strategies for polyamide thin film composite reverse osmosis membranes

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Frontiers of Chemical Science and Engineering 2022年第5期16卷 564-591页

作者： Pei Sean Goh Kar Chun Wong Tuck Whye Wong ahmad fauzi Ismail Advanced Membrane Technology Research Centre(AMTEC) School of Chemical and Energy EngineeringFaculty of EngineeringUniversiti Teknologi Malaysia81310 Johor BahruMalaysia

Polyamide thin film composite membranes have dominated current reverse osmosis market on account of their excellent separation performances compared to the integrally skinned *** their very promising separation performance,chlorine-induced degradation resulted from the susceptibility of polyamide toward chlorine attack has been regarded as the Achilles’s heel of polyamide thin film *** free chlorine species present during chlorine treatment can impair membrane performance through chlorination and depolymerization of the polyamide selective *** material point of view,a chemically stable membrane is crucial for the sustainable application of membrane separation process as it warrants a longer membrane lifespan and reduces the cost involved in membrane *** strategies,particularly those involved membrane material optimization and surface modifications,have been established to address this *** review discusses membrane degradation by free chlorine attack and its correlation with the surface chemistry of *** advancement in the development of chlorine resistant polyamide thin film composite membranes is reviewed based on the state-of-the-art surface modifications and tailoring approaches which include the in situ and postfabrication membrane modifications using a broad range of functional *** challenges and future directions in this field are also highlighted.

关键词： reverse osmosis polyamide thin film composite membranes chlorine resistance surface modification

Surface modification of magnesium alloys using thermal and solid-state cold spray processes:Challenges and latest progresses

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Journal of Magnesium and Alloys 2022年第8期10卷 2025-2061页

作者： Mohammadreza Daroonparvar Hamid Reza Bakhsheshi-Rad Abbas Saberi Mahmood Razzaghi Ashish K Kasar Seeram Ramakrishna Pradeep L.Menezes Manoranjan Misra ahmad fauzi Ismail Safian Sharif Filippo Berto Department of Mechanical Engineering University of NevadaRenoNV89501USA Advanced Materials Research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran Department of Mechanical Engineering National University of Singapore9 Engineering Drive 1Singapore 117576Singapore Department of Chemical and Materials Engineering University of NevadaRenoNV89501USA Advanced Membrane Technology Research Center(AMTEC) Universiti Teknologi MalaysiaJohor Bahru 81310JohorMalaysia Faculty of Engineering Universiti Teknologi MalaysiaJohor Bahru 81310JohorMalaysia Department of Mechanical and Industrial Engineering Norwegian University of Science and Technology7491 TrondheimNorway

Potential engineering applications of magnesium(Mg)and Mg-based alloys,as the lightest structural metal,have made them a popular subject of ***,the inferior corrosion and wear characteristics significantly limit their application *** is widely recognized that surface treatment is the most commonly utilized technique for remarkably improving a substrate’s surface *** methods have been introduced for the surface treatment of Mg and Mg-based alloys to improve their corrosion behavior and tribological *** these,thermal spray(TS)technology provides several methods for deposition of various functional metallic,ceramic,cermet,or other coatings tailored to particular *** researches have shown the tremendous potential for thermal spray coated Mg alloys for biomedical and industrial *** this context,the cold spray(CS)method,as a comparatively new TS coating technique,can generate the coating layer using kinetic energy rather than combined thermal and kinetic energies,like the high-velocity oxy-fuel(HVOF)spray ***,the CS process,as a revolutionary method,is able to repair and refurbish with a faster turnaround time;it also provides solutions that do not require dealing with the thermal stresses that are part of the other repair processes,such as welding or other TS processes using a high-temperature *** this review paper,the recently designed coatings that are specifically applied to Mg alloys(primarily for industrial applications)employing various coating processes are *** of the increased utilization of CS technology for both 3D printed(additively manufactured)coatings and repair of structurally critical components,the most recent CS methods for the surface treatment,repair,and refurbishment of Mg alloys as well as their benefits and restrictions are then discussed and reviewed in ***,the prospects of this field of study are briefly discussed,along with a summa

关键词： Mg-based alloys Surface modification Thermal and cold spray processes Corrosion behavior Wear resistance

Effect of Synthesis Technique and Carbonate Content on the Crystallinity and Morphology of Carbonated Hydroxyapatite

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Journal of Materials Science & Technology 2013年第8期29卷 761-764页

作者： Chia Ching Kee Hanafi Ismail ahmad fauzi Mohd Noor School of Materials and Mineral Resources Engineering Engineering CampusUniversiti Sains Malaysia14300 Nibong TebalPenangMalaysia

The syntheses of nanosized carbonated hydroxyapatite （CHA） were performed by comparing dropwise and direct pouring of acetone solution of Ca（NO3）2·4H2O into mixture of （NH4）2HPO4 and NH4HCO3 at room temperature controlled at pH 11. Direct pouring method was later applied to study the increment of carbonate content in syntheses. The as-synthesized powders were characterized by various characterization techniques. The crystallographic results of the produced powders were obtained from X-ray diffraction analysis, whilst the carbonate content in the produced powders was determined by the CHNS/O elemental analyzer. Fourier transform infrared analysis confirmed that the CHA powders formed were B-type. Field emission scanning electron microscopy revealed that the powders were highly agglomerated in nanosized range and hence energy filtered transmission electron microscopy was employed to show elongated particles which decreased with increasing carbonate content.

关键词： Bioceramic Carbonated hydroxyapatite Dropwise Direct pouring

Potential use of nanofiltration like-forward osmosis membranes for copper ion removal

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Chinese Journal of Chemical Engineering 2020年第2期28卷 420-428页

作者： Wan Nur Ain Shuhada Abdullah Sirinan Tiandee Woeijye Lau Farhana Aziz ahmad fauzi Ismail Advanced Membrane Technology Research Centre(AMTEC) Universiti Teknologi Malaysia81310 SkudaiJohorMalaysia School of Chemical and Energy Engineering Universiti Teknologi Malaysia81310 SkudaiJohorMalaysia Faculty of Science and Industrial Technology Prince of Songkla UniversitySurat Thani Campus84000 Surat ThaniThailand

The discharge of industrial effluent containing heavy metal ions would cause water pollution if such effluent is not properly *** this work,the performance of emerging nanofiltration(NF)like-forward osmosis(FO)membrane was evaluated for its efficiency to remove copper ion from ***,copper ion is removed from aqueous solution via adsorption and/or ion-exchange *** engineered osmosis method as proposed in this work considered four commercial NF membranes(i.e.,NF90,DK,NDX and PFO)where their separation performances were accessed using synthetic water sample containing 100 mg·L-1 copper ion under FO and pressure retarded osmosis(PRO)*** findings indicated that all membranes could achieve almost complete removal of copper regardless of membrane orientation without applying external driving *** high removal rates were in good agreement with the outcomes of the membranes tested under pressuredriven mode at 1 *** use of appropriate salts as draw solutes enabled the NF membranes to be employed in engineered osmosis process,achieving a relatively low reverse solute *** findings showed that the best performing membrane is PFO membrane in which it achieved N 99.4%copper rejection with very minimum reverse solute flux of<1 g·m-2·h-1.

关键词： Nanofiltration Forward osmosis Copper Divalent salt Water flux

Synthesis of titanium oxycarbonitride by carbothermal reduction and nitridation of ilmenite with recycling of polyethylene terephthalate (PET)

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International Journal of Minerals,Metallurgy and Materials 2017年第4期24卷 444-454页

作者： Eltefat ahmadi ahmad fauzi Hashim Hussin Norlia Baharun Kamar Shah Ariffin Sheikh Abdul Rezan School of Materials & Mineral Resources Engineering Universiti Sains Malaysia Engineering Campus 14300 Nibong Tebal Penang Malaysia

An innovative and sustainable carbothermal reduction and nitridation(CTRN) process of ilmenite(FeTiO_3) using a mixture of polyethylene terephthalate(PET) and coal as the primary reductant under an H_2–N_2 atmosphere was proposed. The use of PET as an alternative source of carbon not only enhances the porosity of the pellets but also results in the separation of Fe from titanium oxycarbonitride(TiOxCyNz) particles because of the differences in surface tension. The experiments were carried out at 1250°C for 3 h using four different PET contents ranging from 25wt% to 100wt% in the reductant. X-ray diffraction(XRD),scanning electron microscopy(SEM) in conjunction with energy-dispersive X-ray spectroscopy(EDX),and LECO elemental analysis were used to study the phases and microstructures of the reduced samples. In the case of 75wt% PET,iron distinctly separated from the synthesized Ti OxCyNz phase. With increasing PET content in the sample,the reduction and nitridation rates substantially increased. The synthesis of an oxycarbonitride with stoichiometry of TiO_(0.02)C_(0.13)N_(0.85) with minimal intermediate titanium sub-oxides was achieved. The results also showed that the iron particles formed from CTRN of FeTiO_3 exhibited a spherical morphology,which is conducive for Fe removal via the Becher process.

关键词： carbothermal reduction nitridation polyethylene terephthalate titanium oxycarbonitride ilmenite

Mode-locked fiber laser in the C-band region for dual-wavelength ultrashort pulses emission using a carbon nanotube saturable absorber

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Chinese Optics Letters 2019年第5期17卷 30-33页

作者：刘坤耀郭炳仁 ahmad fauzi Abas Mohammed Thamer Alresheedi Mohd Adzir Mahdi Electronics Research Group. Institute of Power Engineering Uni ver sit i Tenaga Nasional43000 Kajang SelangorMalaysia Department of Electrical Engineering College of EngineeringKing Saud UniversityRiyadh 11421Kingdom of Saudi Arabia Wireless and Photonics Networks Research Centre Faculty of EngineeringUniversiti Putra Alalaysia43400 UPM Ser dangSelangorJMalaysia

A saturable absorber is commonly employed to generate an ultrashort laser with a mode-locking scheme. In an erbium-doped fiber laser system, the laser regimes of either 1530 or 1550 nm wavelength are procured based on the absorption profile of the erbium-doped fiber. The absorption of the erbium-doped fiber is designed to emit at both wavelengths by controlling the net gain of the laser cavity. Subsequently, simultaneous erbium-doped fiber laser emission is attained at 1533.5 and 1555.1 nm with the pulse duration of 910 and 850 fs, ***, this work maximizes the output portfolios of a mode-locking fiber laser for dual-wavelength ultrashort pulses emission.

关键词： mode-locking scheme C-band region dual-wavelength ultrashort pulses emission using

Eco-friendly method for synthesis of zeolitic imidazolate framework 8 decorated graphene oxide for antibacterial activity enhancement

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Particuology 2020年第2期18卷 24-32页

作者： Nazerah ahmad Nik Abdul Hadi Md Nordin Juhana Jaafar Nik ahmad Nizam Nik Malek ahmad fauzi Ismail Muhammad Nabil Fikri Yahya Siti Aishah Mohd Hanim Mohd Sohaimi Abdullah Advanced Membrane Technology Research Centre Universiti Teknologi Malaysia81310 SkudaiJohorMalaysia Malaysian Institute of Chemical Engineering Technology-Universiti Kuala Lumpur Lot 1988Bandar VendorTaboh Naning78000 Alor GajahMelakaMalaysia Chemical Engineering Department Universiti Teknologi PETRONAS32610 Seri IskandarPerakMalaysia Department of Biosciences Faculty of ScienceUniversiti Teknologi Malaysia81310 SkudaiJohorMalaysia Centre for Student Innovation and Technology Entrepreneurship Universiti Teknologi Malaysia81310 SkudaiJohorMalaysia

We report a rapid method for synthesis of zeolitic imidazolate framework 8(ZIF-8)-decorated graphene oxide(GO)composites(ZGO)with good antibacterial *** ZGO composites were synthesized at room temperature with low GO to metal salt *** samples were characterized by X-ray diffraction,transmission electron microscopy,Fourier transform infrared spectroscopy,thermal gravimetric analysis,and surface area *** characterization results show that ZIF-8 with a size of approximately 120 nm is successfully decorated on the surface of GO sheets with the host ZIF-8 framework maintained in the synthesized composite,but there is a significant reduction in the Brunauer-Emmett-Teller surface *** antibacterial activities of the samples against Escherichia coli ATCC 11229 and Staphylococcus aureus ATCC 6538 as model strains of gram-negative and-positive bacteria,respectively,were determined by disc diffusion and minimum inhibitory concentration(MIC)***-1.0(1 wt%of ratio of GO to metal salt)shows the highest antibacterial activity with MIC values required to inhibit bacterial growth of *** and *** of 5 times lower than those of pristine *** antibacterial mechanisms are proposed based on field-emission scanning electron microscope images of the two bacteria after contact with the synthesized ***,owing to the simple synthesis,good stability,low chemical usage,and excellent antibacterial activity of the ZGO composites,they show great potential for application in the field of microbial contamination control.

关键词： Graphene oxide Metal-organic framework Hybrid nanocomposite Zeolitic imidazolate framework Antibacterial agent

Performance evaluation of polyamide nanofiltration membranes for phosphorus removal process and their stability against strong acid/alkali solution

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Chinese Journal of Chemical Engineering 2019年第8期27卷 1789-1797页

作者： Yen Khai Chai How Chun Lam Chai Hoon Koo Woei Jye Lau Soon Onn Lai ahmad fauzi Ismail Department of Civil Engineering Lee Kong Chian Faculty of Engineering and ScienceUniversiti Tunku Abdul RahmanJalan Bandar Sg.LongBandar Sg.Long43000 KajangSelangorMalaysia Advanced Membrane Technology Research Centre(AMTEC) Universiti Teknologi Malaysia81310 SkudaiJohorMalaysia Department of Chemical Engineering Lee Kong Chian Faculty of Engineering and ScienceUniversiti Tunku Abdul RahmanJalan Bandar Sg.LongBandar Sg.Long43000 KajangSelangorMalaysia

In this study,a quantitative performance of three commercial polyamide nanofiltration(NF) membranes(i.e.,NF,NF90,and NF270) for phosphorus removal under different feed conditions was *** experiments were conducted at different feed phosphorus concentrations(2.5,5,10,and 15 mg·L^-1) and elevated pHs(pH 1.5,5,10,and 13.5) at a constant feed pressure of 1 MPa using a dead-end filtration *** rejection against total phosphorus generally increased with increasing phosphorus concentration regardless of membrane *** contrast,the permeate flux for all the membranes only decreased slightly with increasing phosphorus *** results also showed that the phosphorus rejections improved while water flux remained almost unchanged with increasing feed solution *** the three membranes were exposed to strong pHs(pH 1.5 and 13.5) for a longer duration(up to 6 weeks)it was found that the rejection capability and water flux of the membranes remained very similar throughout the duration,except for NF membrane with marginal decrement in phosphorus *** study also revealed that more phosphorus was adsorbed onto the membrane structure at alkaline conditions(pH 10 and 13.5) compared to the same membranes tested at lower pHs(pH 1.5 and 5).In eonelusion,NF270 membrane outperformed Nf and NF90 membranes owing to its desirable performance of water flux and phosphorus rejection particularly under strong alkali *** NF270 membrane achieved 14.0 L·m^-2·h^-1 and 96.5% rejection against 10 mg·L^-1 phosphorus solution with a pH value of 13.5 at the applied pressure of 1 MPa.

关键词： Membrane Nanofiltration Phosphorus removal pH Stability Humic acid

CT Brain Image:Abnormalities Recognition and Segmentation

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Journal of Donghua University(English Edition) 2010年第2期27卷 246-249页

作者： TONG Hau-Lee Mohammad Faizal ahmad fauzi Ryoichi Komiya HAW Su-Cheng Faculty of Information Technology Multimedia UniversityJalan Multimedia Faculty of Engineering Multimedia UniversityJalan Multimedia

In order to develop an automated segmentation system for Computed Tomography(CT)brain images,a new approach which consists of several unsupervised segmentation techniques was introduced. The system segments the CT brain images into three partitions,i.e.,abnor malities,cerebrospinal fluid(CSF) ,and brain matter. Our approach consists of two phase-segmentation *** the first phase segmentation,k-means and fuzzy c-means(FCM)methods were implemented to segment and transform the images into the binary images. Based on the connected component in binary images,a decision tree was employed for the annotation of normal or abnormal regions. In the second phase segmentation,the modified FCM with population-diameter independent(PDI)segmentation was applied to segment the images into CSF and brain matter. The experimental results have shown that our proposed systemis feasible and yield satisfactory results.

关键词：计算断层摄影术无指导的分割 k 工具模糊 c 工具人口直径 indepentdent