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Graphene oxide-chitosan composite material as adsorbent in removing methylene blue dye from synthetic wastewater

Materials Today: Proceedings 2022年 64卷 1587-1596页

作者： Bryan, M.Y.K. Chai, P.V. Law, J.Y. Mahmoudi, E. Department of Chemical & Petroleum Engineering Faculty of Engineering Technology & Built Environment UCSI University Cheras Kuala Lumpur 56000 Malaysia Process Engineering Technology Section Universiti Kuala Lumpur Malaysian Institute of Chemical and Bioengineering Technology Alor Gajah Melaka 78000 Malaysia Department of Chemical and Process Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan 43600 Malaysia Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan 43600 Malaysia

Graphene oxide (GO) and graphene oxide-chitosan (GO-C) were synthesized and its performance in removing methylene blue (MB) dye synthetic wastewater were evaluated. Characterization technique such as measurement of zeta potential and FITR were employed to examine the surface potential of the adsorbent and presence of functional group respectively. The adsorption of MB by GO and GO-C was favored at the alkaline condition and lower temperature. The optimum conditions for the adsorption of MB using GO and GO-C were pH 10, a contact time of 50 min, a temperature of 30 °C and a dosage of 1250 mg/L. GO-C demonstrated higher adsorption capacity and dye removal efficacy due to the presence of the secondary adsorption sites that were attributed to the cross-linking of chitosan with GO. GO-C achieved 99.36 % of dye sequestration in MB synthetic dye wastewater after optimization of all parameters had been performed. Spent GO and GO-C were regenerated efficiently using absolute ethanol. GO and GO-C retained 91.79% and 91.90% of MB dye sequestration, respectively, after three cycles of adsorption–desorption and therefore, proving that GO-based adsorbents have an excellent ability to regenerate and reuse in synthetic dye wastewater. © 2022

关键词： Chitosan

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Integrated System of Solid Oxide Fuel Cell and Ethanol Partial Oxidation: process Simulation and Heat Exchanger Network 6th

Integrated System of Solid Oxide Fuel Cell and Ethanol Parti...

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6th International on Clean Energy and Electrical Systems, CEES 2024

作者： Saebea, Dang Thanomjit, Chollaphan Arpornwichanop, Amornchai Patcharavorachot, Yaneeporn Interdisciplinary Centre for Decarbonisation & Green Energy Department of Chemical Engineering Faculty of Engineering Burapha University Chonburi20131 Thailand Center of Excellence in Process and Energy Systems Engineering Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok10330 Thailand Department of Chemical Engineering School of Engineering King Mongkut’s Institute of Technology Ladkrabang Bangkok10520 Thailand

ISBN: (纸本)9789819757749

A solid oxide fuel cell (SOFC) fueled by reformate obtained from an ethanol partial oxidation (POX) was investigated regarding electrical and the thermal performances. Performance analysis was performed through Aspen Plus simulator. Gas compositions obtained from POX and SOFC were computed through the Gibbs free energy minimization method. Three voltage losses that include activation, ohmic and concentration losses was considered in an electrochemical model. Effects of operating parameters in both POX and SOFC on performance of SOFC-POX system were examined. From the simulation results, it was found that the suitable condition of POX was at the reformer temperature of 700 ℃ and oxygen to ethanol molar ratio of 0.1. While, the operating temperature of SOFC should be 900 ℃. Under these operating conditions, the maximum electrical and thermal efficiencies of 67.24% and 25.77%, respectively, can be achieved. Finally, the heat integration of the SOFC-POX system was considered using pinch analysis. The minimum cold utility is 88.1 kW while the hot utility is no need for this system. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Free energy

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Evaluation of Palm Oil Leaves Extracts as a Potential Environment Friendly Corrosion Inhibitor for Metals 2nd

Evaluation of Palm Oil Leaves Extracts as a Potential Enviro...

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2nd Energy Security and chemical engineering Congress, ESChE 2021

作者： Abdullah, Arman Banius, Euodia Sofian, Azizul Helmi Bin, Lum Wai Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Lebuhraya Tun Razak Pahang Gambang Kuantan26300 Malaysia

ISBN: (纸本)9789811944246

Carbon steel were used in various fields as it is economically affordable, environment friendly, highly durable and with high strength. However, carbon steel tends to corrode compared with other superior materials. Corrosion had brought negative effect to economic, health, safety, and also culture. One of the methods use in controlling the internal corrosion is by using the corrosion inhibitor. Inorganic corrosion inhibitor had long been used to suppress corrosion however they are toxic to health and also environment. Therefore, this research had been conducted to evaluate the potential of the corrosion inhibitor from palm oil leaves (POL) extract. The POL extract was extracted using Microwave Assisted Extraction method (MAE). After extraction, POL extract was sent to LC/MSQ-Tof analysis to test for active chemical component present. The presence of active component such as tannin, flavonoid and alkaloid help to inhibit corrosion. Corrosion inhibition testing were conducted by using weight loss method and electrochemical Tafel plot. SEM test show that carbon steel without inhibitor corrodes more than 90% compare with carbon steel coupon contain POL extract as an inhibitor. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Palm oil

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Acrylonitrile Butadiene Styrene (ABS) membrane for Air Filtration 11

Acrylonitrile Butadiene Styrene (ABS) membrane for Air Filtr...

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11th Australasian Congress on Applied Mechanics, ACAM 2024

作者： Samarathunga, Imesha R. Epaarachchi, Jayantha Sethunga, G.S.M.D.P. Herath, Madhubhashitha Centre for Future Materials University of Southern Queensland Toowoomba Australia Department of Chemical and Process Engineering Faculty of Engineering University of Moratuwa Sri Lanka Department of Engineering Technology Faculty of Technological Studies Uva Wellassa University Sri Lanka

ISBN: (纸本)9781925627787

The amount of particulate matter emitted via anthropogenic activities is significantly increasing. Thus, a high percentage of the global human population suffers from airborne diseases. Hence, using membrane technologies for air purification is becoming more popular. ABS is recognised as an alternative material for conventional membrane manufacturing due to its economic viability, ease of processability, and convenience in forming less fouled membranes. This study investigated the effect of ABS polymer concentration of the dope solution, co-solvent, and thickness on the membrane characteristics. Eight experiments were conducted in three phases. ABS was varied in 15 wt%, 25 wt%, and 30 wt% with the solvent N, N-Dimethylformamide (DMF) in phase I. The effect of the membrane’s dry thickness on its properties was explored using three different thicknesses in phase II. In phase III of the experiment, DMF/acetone weight percentages were 74:1 and 74.9:0.1, respectively, while ABS was 25 wt%. Synthesized membranes were characterised using Scanning Electron Microscopy (SEM), Fourier transform Infrared spectroscopy (FTIR), water contact angle, mechanical properties, and Thermogravimetric analysis (TGA). The SEM images depicted membrane morphology when adding acetone to the dope solution. Pore sizes of all membranes were less than 1 µm. All FTIR spectrums have exhibited similar patterns, confirming the unchanged chemical bonds inside membranes. Tensile test results depict that when the polymer concentration of the dope solution increased from 15 wt% to 30 wt%, tensile strength increased from 1.78 MPa to 5.68 MPa, while the elongation increased by 6.83%. However, when the membrane thickness decreased from 0.56 mm to 0.13 mm, tensile strength was enhanced by 69%. Therefore, it can be concluded that ABS will be an excellent substitute material for membrane air filtration. © 2024 11th Australasian Congress on Applied Mechanics, ACAM 2024. All rights reserved.

关键词： Tensile strength

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Controlled release of niacinamide from fibrous silica nanocarrier in face serum formulation 6

Controlled release of niacinamide from fibrous silica nanoca...

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6th National Conference on Postgraduate Research, NCON-PGR 2022

作者： Fateha Binti Sukor, Nuramira Binti Jusoh, Rohayu Syahirah Binti Kamarudin, Nur Faculty of Chemical and Process Engineering Technology College of Engineering Gambang Kuantan Pahang26300 Malaysia

The current study offers controlled release of niacinamide from fibrous silica (KCC-1) loaded in a face serum formulation. Furthermore, three drug loading methods, namely physical mixing, melting, and solvent evaporation, denoted as (Phy)/Nia-KCC-1, (Mel)/Nia-KCC-1, and (Sol)/Nia-KCC-1, respectively, were implemented, and the percentage loading efficiencies were compared. (Mel)/Nia-KCC-1 demonstrated the highest percentage of drug loading at 33%, followed by (Phy)/Nia-KCC-1 and (Sol)/Nia-KCC-1 at 25% and 17%, respectively. Likewise, the in vitro release study also revealed a similar pattern, with (Mel)/Nia-KCC-1 recording the highest percentage release at 29%, followed by (Phy)/Nia-KCC-1 and (Sol)/Nia-KCC-1 at 24% and 21%, respectively. As the (Mel)/Nia-KCC-1 sample unveiled decent results in transporting the sample drug, the respective sample was then further loaded into the face serum formulation, and the pH stability was observed for 7 days. The pH readings remained constant at pH 4.3 throughout the 7 days, within the acceptance range according to the derma-cosmetic product that states the effective pH should lie between pH 4 and pH 6. Therefore, it can be stated that the (Mel)/Nia-KCC-1 loaded serum fulfills the acceptance criteria for the pH requirement of derma-cosmetic products. © 2022 Elsevier Ltd. All rights reserved.

关键词： Targeted drug delivery

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Biodegradable and Green Degreaser for Industrial Application: An Overview 3

Biodegradable and Green Degreaser for Industrial Application...

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3rd International Postgraduate Conference on Mechanical engineering 2024, IPCME 2024

作者： Cholis, Nur Razali, Mohd Najib Ramli, Najmuddin Mohd Sahran, Mohd Syahmi Iskandar Faculty of Manufacturing and Mechatronic Engineering Technology Universiti Malaysia Pahang Al-Sultan Abdullah Pekan Pahang26300 Malaysia Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Al-Sultan Abdullah Gambang Pahang26300 Malaysia Faculty of Engineering Universitas Pembangunan Nasional Veteran Jakarta Selatan Jakarta12450 Indonesia

This paper provides a comprehensive overview of biodegradable and green degreasers for industrial applications. Traditional degreasers, although effective in removing oils, grease, and residues, often pose significant environmental and health concerns due to the use of hazardous chemicals like volatile organic compounds (VOCs) and nonylphenol ethoxylates (NPEs). In response to increasing regulatory pressures and sustainability goals, biodegradable alternatives are gaining attention. These green degreasers utilize renewable materials, aligning with key Sustainable Development Goals (SDGs) related to environmental protection, climate action, and sustainable industrial practices. While these eco-friendly solutions offer promising performance and environmental benefits, challenges such as cost, awareness, and certification hinder widespread adoption. The review emphasizes the importance of continuous research, the need for standardization in biodegradability assessment, and innovations in biosurfactants and nanotechnology to improve the effectiveness of these products. Ultimately, biodegradable degreasers present a sustainable path forward for industries aiming to reduce their environmental impact and comply with evolving regulatory frameworks. © Published under licence by IOP Publishing Ltd.

关键词： Green development

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Polyethylene-Co-Vinyl Acetate (EVA) and Nanoparticle Effect on Wax Deposition: A Molecular Dynamics (MD) Simulation Approach

Polyethylene-Co-Vinyl Acetate (EVA) and Nanoparticle Effect ...

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2024 SPE Nigeria Annual International Conference and Exhibition, NAIC 2024

作者： Ridzuan, N. Gbonhinbor, J.R. Agi, A. Faculty of Chemical and Process Engineering Technology College of Engineering Technology Universiti Malaysia Pahang Al-Sultan Abdullah Pahang Gambang Malaysia Department of Petroleum Engineering Niger Delta University Wilberforce Island Bayelsa State Amassoma Nigeria

ISBN: (纸本)9781959025474

Wax buildup is a worldwide concern in oil pipelines, spanning from subsea to processing facilities, leading to decreased oil production rates. An effective way to prevent the formation of solid wax mandates the use of chemical wax inhibitors. Molecular dynamics (MD) simulations were employed to investigate how poly(ethylene-co-vinyl acetate) (EVA) and sodium cloisite (Na+) nanoparticles (NPs) collaborate to inhibit wax formation. The simulations involved examining the behavior of EVA molecules, both with and without the incorporation of NPs, in conjunction with wax molecules. This investigation aimed to elucidate the intermolecular interactions, which influence wax formation and deformation, through radial distribution function (rdf) analysis. The outcomes revealed a substantial shift in the interaction between H59•••H60 in the EVA/NP and wax system, progressing from 2.75 Å in the pure wax system to 3.25 Å. This shift signifies the significant impact of wax inhibitors and nanoparticles in the tertiary system on wax-wax interactions. Consequently, the findings from the cold finger test corroborate that the EVA/NP blend results in the least wax deposition, which is further supported by the simulation results. In conclusion, the incorporation of nanoparticles with wax inhibitors emerges as an efficacious approach for mitigating wax deposition challenges within the oil and gas industry. Copyright © 2024, Society of Petroleum Engineers.

关键词： Gas industry

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Recovery of antioxidant from Decapterus Macarellus waste using wet rendering method

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Materials Today: Proceedings 2022年 57卷 1382-1388页

作者： Yusoh, Nurlaylatul Akmal Mohd Man, Rohaida Che Azman, Nurul Aini Mohd Shaarani, Shalyda Md Mudalip, Siti Kholijah Abdul Sulaiman, Siti Zubaidah Arshad, Zatul Iffah Mohd College of Engineering Universiti Malaysia Pahang Pahang Gambang 26300 Malaysia Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Pahang Gambang 26300 Malaysia

In Malaysia, Decapterus Maruadsi is widely used as the main ingredient in food products such as ‘keropok lekor’ and fish cracker. The wastes generated from the fish snack industry are underutilized and most are discarded into the sea, generating considerable environmental pollution. The recovery of antioxidants in the fish wastes could lead to the development of a very exciting and promising alternative source of commercial antioxidant compounds. The objective of the present work is to investigate the effect of temperature, type of solvent, extraction time, and ratio of sample to solvent loading in the extraction of antioxidants from Decapterus Maruadsi waste using the wet rendering method. The collected fish waste of Decapterus Maruadsi was pre-treated and then subjected to a wet rendering treatment at 0–60 °C for 30–150 min with ratio of sample to solvent loading of between 1:10 and 9:10 (w/v). The presence of antioxidant in the extract was analyzed using 2,2-Diphenyl-1-picrylhydrazyl (DPPH) and Total Phenolic Compound (TPC) assays. Based on the results of this study, wet rendering treatment performed for 90 min at 30 °C with a ratio of sample to solvent loading of 3:10 produced an extract with the highest concentration of active antioxidant compounds. Besides, only N-Acetyl-glutamic acid was identified with LCMS QTOF analysis. These results suggest that the fish waste of Decapterus Maruadsi can be exploited to become a source of antioxidants for food and pharmaceutical applications. © 2022

关键词： Antioxidants

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Growth performance and mineral analysis of Pleurotus ostreatus (oyster mushroom) cultivated on spent mushroom medium mixed with rubber tree sawdust

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Materials Today: Proceedings 2022年 57卷 1329-1337页

作者： Ahmad Zakil, Fathie Mohd Isa, Raffizah Mohd Sueb, Mohd Shafiq Isha, Ruzinah College of Engineering Universiti Malaysia Pahang Pahang Gambang26300 Malaysia Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Pahang Gambang26300 Malaysia

The objective of this paper is to study potential application of spent mushroom substrate (SMS) in production of Pleurotus ostreatus mushroom. A various mass ratio mixture of rubber sawdust (RS) and SMS with wheat bran supplement were prepared for mushroom cultivation. The mushroom house was kept at an optimal condition with temperature between 28 and 33 ℃ and humidity in the range between 80 and 95%. The results showed that the 50% SMS + 50% RS had a significantly higher of average total yield at 156.12 g/bag, biological efficiency (B.E) of 55.76% and required only 26 ± 2 days for mycelium growth in comparison to 100% RS, a control substrate. It is also found that potassium (K) was the most concentrated macroelement and all heavy metal concentrations were below the maximum permitted by WHO/FAO in the first fresh mushroom collected. Therefore, it can be proven that SMS can be a great solution to the disposal issue, and it can be an excellent medium for the cultivation of Pleurotus spp. when it is combined with the RS. © 2022

关键词： Substrates

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Formation mechanism and application potential of carbon dots synthesized from palm kernel shell via microwave assisted method

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Carbon Resources Conversion 2022年第2期5卷 150-166页

作者： Thivyah Balakrishnan Wei Lun Ang Ebrahim Mahmoudi Abdul Wahab Mohammad Nonni Soraya Sambudi Department of Chemical and Process Engineering Faculty of Engineering&Built EnvironmentUniversiti Kebangsaan Malaysia43600 BangiSelangorMalaysia Centre for Sustainable Process Technology Faculty of Engineering&Built EnvironmentUniversiti Kebangsaan Malaysia43600 BangiSelangorMalaysia Department of Chemical Engineering Universiti Teknologi PETRONAS32610 Seri IskandarPerakMalaysia

The present study systematically investigated the influence of synthesis conditions(duration,reaction medium,and doping concentration)and formation mechanism of carbon dots(CDs)derived from low-cost and abundant biomass palm kernel shell(PKS).Surprisingly,the dopant(urea)did not enhance the photoluminescence of CDs as expected,which could be attributed to the low reactivity between the dopant and PKS *** of synthesis duration from 30 to 120 s clearly indicated the formation mechanism of CDs,involving the stages of dehydration,carbonization,and *** CDs with the highest photoluminescent intensity and quantum yield was obtained at synthesis duration of 90 s,aligned well with the perfect spherical shape of CDs and the synergistic effects of both surface and carbogenic core *** the formation mechanism could be used to optimize the synthesis of CDs,and hence linked to quantum yield and fluorescent *** terms of application potential,the CDs illuminated well as fluorescent ink and in bacteria cells *** potential of CDs as sensing material has also been proven with the quenching of fluorescence in the presence of metal *** linear range for detection of Cu2+ions was 0.1–0.5 mM with a detection limit as low as 0.05 *** signifies the potential of CDs fabricated from PKS as a low-cost and easily available material for Cu2+ions detection in aqueous *** CDs possessed reasonable photo stability as indicated by its consistent fluorescence level even after exposure to UV radiation for a prolonged period of 180 ***,a simple,straightforward,and fast method is developed to synthesis strong blue emissive CDs from green PKS that are potentially suitable for Cu2+ions sensing in real application.

关键词： Carbon dots Microwave radiation Palm kernel shell Cell imaging Metal ions detection

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