South African Journal of Chemical Engineering最新文献

Green technologies in food colorant extraction: A comprehensive review 食品着色剂提取中的绿色技术：综合评述

South African Journal of Chemical Engineering Pub Date : 2024-11-01 DOI: 10.1016/j.sajce.2024.10.013

引用次数: 0

Molar enthalpy and heat capacity for symmetric trigonometric Rosen-Morse plus Pὂschl-Teller potential 对称三角 Rosen-Morse 加 Pὂschl-Teller 势的摩尔焓和热容

South African Journal of Chemical Engineering Pub Date : 2024-10-28 DOI: 10.1016/j.sajce.2024.10.007

{"title":"Molar enthalpy and heat capacity for symmetric trigonometric Rosen-Morse plus Pὂschl-Teller potential","authors":"","doi":"10.1016/j.sajce.2024.10.007","DOIUrl":"10.1016/j.sajce.2024.10.007","url":null,"abstract":"<div><div>Some potential models are only studied for open systems even though applied to certain models, the theoretical value cannot be justified by the observed data, such potential model includes the symmetric trigonometric Rosen-Morse potential and some certain types of Pὂschl-Teller potential. Their inability to reproduce the observed data is due to the potential parameters that lack physical meanings. To make these types of potentials more useful and interesting, the present study combined the symmetric trigonometric Rosen-Morse potential and a type of Pὂschl-Teller potential and transformed the potential parameters to spectroscopic parameters to suit molecular study. The energy of the modified potential is applied to the study of some thermodynamic properties (enthalpy and heat capacity at constant pressure) for some molecules. The numerical results of the various thermodynamic properties of the modified potential reproduced experimental data for some molecules for the four molecules studied. The predicted results for each of the four molecules has average percentage deviation of less than one percent justifying an excellent agreement with the experimental data.</div></div>","PeriodicalId":21926,"journal":{"name":"South African Journal of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142579097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integration of mathematical and experimental modeling for sustainable phycobiliprotein production via fed-batch cultures 整合数学模型和实验模型，通过分批进行喂养培养实现可持续藻类蛋白生产

South African Journal of Chemical Engineering Pub Date : 2024-10-24 DOI: 10.1016/j.sajce.2024.10.009

{"title":"Integration of mathematical and experimental modeling for sustainable phycobiliprotein production via fed-batch cultures","authors":"","doi":"10.1016/j.sajce.2024.10.009","DOIUrl":"10.1016/j.sajce.2024.10.009","url":null,"abstract":"<div><div>The production of phycobiliproteins, such as cyanobacterial phycocyanins, is a growing interest due to their diverse industrial and biotechnological applications. This study focuses on optimizing phycocyanin production using the strain <em>Potamosiphon</em> sp. through experimental techniques and mathematical modeling in fed-batch cultures. The methodology applied includes determining the kinetic constants by linearizing the Monod equation evaluating the concentrations of biomass, C-phycocyanin (C-PC), nitrates (NO<sub>3</sub>), and phosphates (PO<sub>4</sub>). A mathematical model of periodic fed-batch feeding was subsequently established, applying mass conservation principles and evaluating the accuracy of the Monod, Contois, Moser, and Tessier models. The results indicate that phycocyanin production is highly dependent on phosphorus and nitrogen concentrations, with optimal conversion observed at specific levels of these elements (0.832 for phosphorus and 0.805 for nitrogen in terms of C-PC and biomass, respectively). The Tessier model demonstrated the highest accuracy in predicting production and optimizing operational conditions, with a Mean Squared Error (MSE) of 0.005000 for biomass production, 0.200000 for C-PC production, and 0.000010 for substrate consumption. It also achieved high R² values of 0.980 for biomass, 0.999 for C-PC production, and 0.997 for substrate consumption. It presented the lowest Akaike Information Criterion (AIC) scores, indicating its robustness and reliability in modeling these processes and manipulating cultivation conditions and providing adequate nutrition allowed for achieving growth rates of 1.23 g/L and a C-PC concentration of 37 mg/L, which are essential for industrial applications such as natural colorants and antioxidants, among others.</div></div>","PeriodicalId":21926,"journal":{"name":"South African Journal of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization of microwave-assisted hydrolysis of glucose from oil palm empty fruit bunch 优化微波辅助水解油棕空果束中的葡萄糖

South African Journal of Chemical Engineering Pub Date : 2024-10-23 DOI: 10.1016/j.sajce.2024.10.004

{"title":"Optimization of microwave-assisted hydrolysis of glucose from oil palm empty fruit bunch","authors":"","doi":"10.1016/j.sajce.2024.10.004","DOIUrl":"10.1016/j.sajce.2024.10.004","url":null,"abstract":"<div><div>Hydrolysis of oil palm empty fruit bunches (OPEFB) using microwave as an energy source is carried out to produce sugar with mild operating conditions. One way to find the best conditions that can obtain high-quality sugar is to optimize the hydrolysis process. In this study, optimization was carried out using Response Surface Methodology (RSM) with a Central Composite Design (CCD) experimental design. Estimated variables to affect the hydrolysis process are the ratio of OPEFB to solvent (X<sub>1</sub>: 1:20–4:20 g/ml), solvent concentration (X<sub>2</sub>: 0.5–1.5 %), and hydrolysis time (X<sub>3</sub>: 5–15 min). Hydrolysis success parameters were measured by hydrolysis temperature (Y<sub>1</sub>), glucose (Y<sub>2</sub>), fructose (Y<sub>3</sub>), and total sugar (Y<sub>4</sub>) concentration. The optimization results show that the three independent variables contribute 53.25 % to the hydrolysis temperature and 86.42 % to the sugar concentration. The recommended operating conditions were hydrolysis with the ratio of OPEFB to solvent of 4:20 g/ml, solvent concentration of 0.5 %, and carried out for 10 min. The hydrolysis temperature cannot be optimized because there is a mismatch in the temperature model analysis. The application of these conditions is predicted to produce glucose, fructose, and total sugar of 315.51; 258.24; 573.85 mg/L respectively. The last step is to validate these conditions in the laboratory to get the actual value. Actual glucose, fructose, and total sugar obtained were 300.40; 245.44; 545.84 mg/L respectively. The error in this study is less than 5 % which indicates the actual value is following the predicted value. © 2001 Elsevier Science. All rights reserved.</div></div>","PeriodicalId":21926,"journal":{"name":"South African Journal of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Chitosan/CNDs coated Cu electrode surface has an electrical potential for electrical energy application 壳聚糖/CNDs 涂层铜电极表面具有电能应用潜力

South African Journal of Chemical Engineering Pub Date : 2024-10-01 DOI: 10.1016/j.sajce.2024.09.013

{"title":"Chitosan/CNDs coated Cu electrode surface has an electrical potential for electrical energy application","authors":"","doi":"10.1016/j.sajce.2024.09.013","DOIUrl":"10.1016/j.sajce.2024.09.013","url":null,"abstract":"<div><div>Polymers and nanomaterials had been widely applied at electrochemical chemosensor and biosensor. Developing technical energy is still much needed, especially using natural environmental friendly material. Both chitosan of biopolymer and carbon nanodots (CNDs) of nanomaterials are highly studied due to their extraordinary properties. The research focus on chitosan and chitosan/CNDs nanocomposite surface that was applied for electrical energy. Nanocomposite was coated on Cu electrode surface by using electroplating method. The coated electrode was dipped into oil samples. The dipped nanocomposite then was characterized by FTIR, XRD, SEM, and Chemosensor. Nanocomposite structure is still maintain its chemical compound, confirmed by FTIR and XRD, which still maintain amine group; hydroxyl group; and crystalinity of chitosan after CNDs intercoporation. Nanocomposite surface morphology show magnetite particle distribution that spreaded on the surface of electrode for both chitosan and CNDs nanocomposite, which is confirmed by SEM. The free dipping method is based on the sensitive material chitosan/CNDs as a chemosensor; the pressure process on the surface of the chitosan/CNDs sensitive material causes the interaction of metal ions and acid compounds, which involves an iontophoresis process where oil atoms that have been excited in the evaporation process will experience atomic vibrations due to electron transport which then the active groups on the Chemosensor directly absorb and bind metals and acids in oil use a chemisorption process which leads to the transfer of charge from the adsorption particles to the chemosensor surface to fill the holes so that a potential difference occurs in the form of electrical pulses which will then be captured by the Arduino system which will be converted into digital data. This process makes technological energy production in the form of electrical energy faster.</div></div>","PeriodicalId":21926,"journal":{"name":"South African Journal of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Heat transfer characteristics of mixed convection inside a differentially heated square cavity containing an oscillating porous cylinder 包含摆动多孔圆柱体的差热方形空腔内混合对流的传热特性

South African Journal of Chemical Engineering Pub Date : 2024-10-01 DOI: 10.1016/j.sajce.2024.10.006

{"title":"Heat transfer characteristics of mixed convection inside a differentially heated square cavity containing an oscillating porous cylinder","authors":"","doi":"10.1016/j.sajce.2024.10.006","DOIUrl":"10.1016/j.sajce.2024.10.006","url":null,"abstract":"<div><div>The current study presents mixed convective flow inside a square chamber holding a centrally placed and thermally conductive oscillating porous circular cylinder. The left boundary's temperature is kept larger than that of the right edge, and the horizontal edges are preserved at adiabatic settings. The circumferential speed of the cylinder is sinusoidal and oscillating in nature. The fluid region within the chamber is modeled employing 2D Navier-Stokes and heat energy equations. Furthermore, the fluid circulation and heat transmission within the porous cylinder are modeled using the Darcy-Brinkman-Forchheimer formulation. The leading equations are discretized utilizing the Galerkin finite element technique. The parametric study is undertaken considering three distinct diameters of the porous cylinder and three distinct oscillation frequencies. The instant Nusselt number is evaluated along the heated wall, which varies in an oscillatory pattern owing to the repeated contraction and enlargement of the thermal boundary layer. The Nusselt number is averaged over time once the value becomes statistically stationary. The study is conducted within a mixed convection region with Reynolds (<em>Re</em> = 100), Richardson (0.1 ≤ <em>Ri</em> ≤ 10), and Grashof (10<sup>3</sup> ≤ <em>G</em>r ≤ 10<sup>5</sup>) numbers. Upon thorough examination, it becomes clear that the system's thermal performance shows promising improvement with the largest cylinder diameter and the lowest oscillation frequency. Specifically, the average Nusselt number shows a maximum improvement of 21.50 % at the largest cylinder diameter.</div></div>","PeriodicalId":21926,"journal":{"name":"South African Journal of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Furfural purification and production from prospective agricultural waste of oil palm empty fruit bunch: Simulation, design and economic assessments 利用油棕空果束的农业废弃物提纯和生产糠醛：模拟、设计和经济评估

South African Journal of Chemical Engineering Pub Date : 2024-10-01 DOI: 10.1016/j.sajce.2024.10.003

{"title":"Furfural purification and production from prospective agricultural waste of oil palm empty fruit bunch: Simulation, design and economic assessments","authors":"","doi":"10.1016/j.sajce.2024.10.003","DOIUrl":"10.1016/j.sajce.2024.10.003","url":null,"abstract":"<div><div>Furfural is potentially produced from lignocellulose waste of biorefinery processes and is widely used as a value-added in various chemical industries. However, the purification of furfural should be conducted to obtain high purity. This work aims to synthesize, design, and optimize the furfural production using some alternative distillation processes by simulation using Super Pro and ASPEN software. The pretreatment process of producing crude furfural from empty fruit bunch waste is also evaluated. The production cost of $0.23/kg of crude furfural (5 %) was obtained in the preliminary process. In the purification process, the sequenced distillation process was less prospective than the extractive distillation based on the simulation basis and economic evaluation. The extractive distillation using n‑butyl chloride performed better than toluene and benzene as the furfural recovery, and the purity was 98.60 % and 99.94 %, respectively. The payback period (PBP), internal rate return (IRR), and net present value (NPV) also indicated the great performance of the extractive distillation process with values of 1.24 years, 36.04 %, and $14,591,500, respectively. Therefore, the simulation, design, and economic evaluation presented promising results that are feasible for plant establishment.</div></div>","PeriodicalId":21926,"journal":{"name":"South African Journal of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-performance of anti-bacterial composite membrane prepared from polyethersulfone-polyethylene glycol-silver nanoparticles 聚醚砜-聚乙二醇-银纳米颗粒制备的高性能抗菌复合膜

South African Journal of Chemical Engineering Pub Date : 2024-10-01 DOI: 10.1016/j.sajce.2024.09.009

引用次数: 0

Investigation of methylene blue dye degradation using green synthesized mesoporous silver-titanium 利用绿色合成介孔银钛研究亚甲基蓝染料降解问题

South African Journal of Chemical Engineering Pub Date : 2024-10-01 DOI: 10.1016/j.sajce.2024.09.012

{"title":"Investigation of methylene blue dye degradation using green synthesized mesoporous silver-titanium","authors":"","doi":"10.1016/j.sajce.2024.09.012","DOIUrl":"10.1016/j.sajce.2024.09.012","url":null,"abstract":"<div><div>In this study, we synthesized mesoporous silver-titanium (Ag/TiO<sub>2</sub>) through green synthesis approach using mangosteen pericarp extract, which subsequently can act as both adsorbent and photocatalyst materials. Additionally, we investigated and compared the degradation of methylene blue (MB) using mesoporous Ag/TiO<sub>2</sub> under dark conditions, visible light irradiation, and both dark-light conditions to analyze the adsorption-photocatalysis activity. The achieved mesoporous structure in this study offers distinct advantages as an adsorbent. Moreover, the addition of silver (Ag) to titanium dioxide (TiO<sub>2</sub>) shows promise in enhancing photocatalytic activity in MB degradation, which enhances photocatalytic activity in the visible light region due to its localized surface plasmon resonance (LSPR), which excites more electrons, resulting in increased MB degradation. The highest degradation percentage of 97.08 % was obtained using a dark-light degradation mechanism, demonstrating that the synthesized mesoporous Ag/TiO<sub>2</sub> has potential as an effective integrated adsorbent-photocatalyst material for MB dye degradation.</div></div>","PeriodicalId":21926,"journal":{"name":"South African Journal of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Methods used in the identification and quantification of micro(nano)plastics from water environments 用于识别和量化水环境中的微型（纳米）塑料的方法

South African Journal of Chemical Engineering Pub Date : 2024-10-01 DOI: 10.1016/j.sajce.2024.09.010

{"title":"Methods used in the identification and quantification of micro(nano)plastics from water environments","authors":"","doi":"10.1016/j.sajce.2024.09.010","DOIUrl":"10.1016/j.sajce.2024.09.010","url":null,"abstract":"<div><div>Micro(nano)plastics (MNPs) pollution, which has currently become a serious environmental problem, poses a great risk to ecosystem health and biodiversity. The adverse effects of MNPs in different characteristics on organismal homeostasis are intensively studied due to their considerable threats to ecology and human/public health, since they have been identified in human blood, placenta and breast milk. To date, many studies have been carried out on MNPs, and remarkable results have been reported on their diversity, distribution, origins and their influences at the cellular level, to name a few. The literature suggests that the extent of the risk caused by MNPs is increasing significantly every year, making it even more critical and urgent to combat MNPs pollution in the environment including aquatic environments. Therefore, it is highly important to identify, quantify and monitor MNPs, especially in the water environments since it represents one of the main transportation routes of MNPs. In this review, we provide a broad and critical overview of the different methods, such as Fourier transform infrared spectroscopy (FT–IR), Raman spectroscopy, transmission/scanning electron microscopy (TEM/SEM), and gas chromatography–mass spectrometry (GC–MS), currently used in the identification and quantification of MNPs, especially in aquatic environments such as seawater and marine sediments. Each of these previous methodologies has its own unique advantages and limitations; besides, there is no validated and standardized analytical method for MNPs determination, implying that more than one method or the combinations of different methodologies are required to obtain accurate data at the current state. Moreover, considering the presence of high variability of data among different methods, more research is needed to develop a universal analytical protocol to increase reproducibility and robustness of the findings on MNPs contamination in the environment, in order to increase the credibility and impact of the field.</div></div>","PeriodicalId":21926,"journal":{"name":"South African Journal of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142357479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0