South African Journal of Chemical Engineering最新文献_第7页

Synergizing the pore structure and functionality of CAU-10-series metal-organic framework materials for energy-efficient ammonia separation 协同cu -10系列金属有机骨架材料的孔隙结构和功能，实现高效氨分离

Q1 Social Sciences

South African Journal of Chemical Engineering

Pub Date : 2025-10-01 DOI: 10.1016/j.sajce.2025.09.014

Shih-Yuan Chen , Chung-Kai Chang , Martin Keller , Genki Horiguchi , Takehisa Mochizuki , Dun-Yen Kang

Alumina-based metal–organic framework materials (Al-based MOFs) are integrated into an ammonia (NH₃) synthesis process to achieve 1–5 % NH₃ adsorptive separation at 25–100 °C and 1 bar (corresponding to an NH₃ partial pressure of ∼1000–5000 Pa). Monte Carlo simulation and temperature-programmed analysis are employed to clarify the crucial role of functional groups on the pore surface and shape of Al-based MOFs and their effects on NH₃ interactions. This approach focuses on specific surface areas, which contrasts with traditional approaches. Among these Al-based MOFs, CAU-10-OH composed of octahedral Al species linked to 5-hydroxyisophthalic acid exhibit high NH₃ adsorption capacity (3.6–1.8 mmol g⁻¹) at 25–100 °C and stability over 15 adsorption–desorption cycles (∼180 h). This performance is comparable to that of microporous ZSM-5 zeolitic materials and significantly exceeds that of silica and activated carbon. NH₃ adsorption and desorption heat (60 kJ mol⁻¹) on CAU-10-OH with hydroxyl groups located in cage-like pores (2.41 Å) are suitable for low-concentration, ambient-temperature NH₃ separation. Integrating CAU-10-OH at 25 °C downstream of Ru-catalyzed mild NH₃ synthesis exhibits rapid NH₃ adsorption, proving its practical efficacy for synthesis and separation under mild conditions. The proposed method can potentially enhance energy efficiency and reduce capital costs by minimizing processing steps.

铝基金属有机骨架材料（Al-based MOFs）集成到氨（NH3）合成过程中，在25-100°C和1 bar（对应于NH3分压为~ 1000-5000 Pa）下实现1 - 5%的NH3吸附分离。利用蒙特卡罗模拟和温度程序分析阐明了官能团对al基mof孔表面和形状的关键作用及其对NH3相互作用的影响。这种方法侧重于特定表面积，这与传统方法形成了对比。在这些Al基mof中，与5-羟基间苯二甲酸连接的八面体Al组成的CAU-10-OH在25-100°C下具有较高的NH3吸附容量（3.6-1.8 mmol g−1），并且在15个吸附-解吸循环（~ 180 h）内具有稳定性。该性能与微孔ZSM-5沸石材料相当，明显超过二氧化硅和活性炭的性能。cu -10- oh对NH3的吸附和解吸热为60 kJ mol−1，羟基位于笼状孔（2.41 Å）中，适合于低浓度、常温的NH3分离。在ru催化的温和NH3合成下游，在25℃下整合CAU-10-OH，表现出对NH3的快速吸附，证明了其在温和条件下合成和分离的实际效果。所提出的方法可以通过最小化处理步骤来潜在地提高能源效率并降低资本成本。

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引用次数: 0

Determination of the influence of the role of the Hf dopant concentration variation on the stability to degradation of ZrO2 ceramics considered as materials for solid oxide fuel cells 确定Hf掺杂剂浓度变化对固体氧化物燃料电池材料ZrO2陶瓷降解稳定性的影响

Q1 Social Sciences

South African Journal of Chemical Engineering

Pub Date : 2025-10-01 DOI: 10.1016/j.sajce.2025.09.013

Sh.G Giniyatova , D.I. Shlimas , D.B. Borgekov , A.T. Zhumazhanova , N. Volodina , A.L. Kozlovskiy

The key objective of this study is to determine the effect of hafnium stabilization of ZrO₂ ceramics and to identify its role in hardening and enhancement of resistance to degradation processes caused by the use of these ceramics as anode materials in solid oxide fuel cells. According to the X-ray structural analysis and Raman spectroscopy data, it was found that with an elevation in the Hf dopant concentration, the HfO₂ phase is formed in the composition of the ceramics, which has a similar structural motif to the monoclinic phase of ZrO₂, resulting in the formation of a continuous substitution solid solution of ZrO₂/HfO₂, and a change in the crystal lattice parameters of the monoclinic phase of ZrO₂ indicates the substitution of Zr⁴⁺ ions by Hf⁴⁺ ions, leading to a growth in the crystal lattice parameters, and consequently, the formation of oxygen vacancies. According to the assessment of the mechanical and strength properties of Zr(Hf)O₂ ceramics, it was found that the formation of inclusions in the ceramics in the form of HfO₂, which form a continuous solid solution at low concentrations, leads to an increase in resistance to external influences within 35 – 40 % compared to unstabilized ZrO₂ ceramics, but a rise in the density of oxygen vacancies above 4.4 × 10¹⁸, alongside the formation of T-defects in the structure leads to a decrease in resistance to external influences, but the strength parameters exceed the values for unstabilized ZrO₂ ceramics. Evaluation of the efficiency of using Zr(Hf)O₂ ceramics as anode materials revealed that at low dopant concentrations, not only an increase in specific power is observed, but also the stability of electrochemical parameters is maintained in the case of prolonged high-temperature exposure, which has a negative impact on maintenance of the performance of solid oxide fuel cells.

本研究的主要目的是确定ZrO2陶瓷的铪稳定化效果，并确定其在固体氧化物燃料电池中使用这些陶瓷作为阳极材料引起的硬化和增强抗降解过程中的作用。根据x射线结构分析和拉曼光谱数据,发现与海拔高频掺杂剂浓度,HfO2阶段是形成于陶瓷的成分,也有类似的结构图案的单斜相的氧化锆、导致连续的形成置换固溶体的氧化锆/ HfO2,和改变晶格参数单斜相的氧化锆表明Zr4 +离子的置换Hf4 +离子,导致晶体晶格参数的增长，从而形成氧空位。通过对Zr(Hf)O2陶瓷的力学性能和强度性能的评估，发现陶瓷中以HfO2形式形成的包裹体，在低浓度下形成连续的固溶体，使陶瓷的抗外界影响能力比不稳定的ZrO2陶瓷提高了35 ~ 40%，但氧空位密度上升到4.4 × 1018以上。随着结构中t型缺陷的形成，导致抗外界影响的降低，但强度参数超过了非稳定ZrO2陶瓷的值。对Zr(Hf)O2陶瓷作为阳极材料的效率评价表明，在低掺杂浓度下，不仅比功率增加，而且在长时间高温暴露的情况下，电化学参数保持稳定，这对固体氧化物燃料电池性能的维持有负面影响。

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引用次数: 0

Factors contributing to reduced photocatalytic activity in Cu-loaded TiO2/activated carbon composites for methylene blue degradation 负载cu的TiO2/活性炭复合材料降解亚甲基蓝的光催化活性降低的影响因素

Q1 Social Sciences

South African Journal of Chemical Engineering

Pub Date : 2025-10-01 DOI: 10.1016/j.sajce.2025.09.015

Nur Karimah , Risna Citra Andiani , Wahyu Prasetyo Utomo , Ade Irma Rozafia , Nor Farida , Afifah Rosyidah , Rui Liu , Qili Xu , Djoko Hartanto

TiO₂ is a semiconductor widely used in photocatalytic applications due to its excellent chemical stability, yet it has a low surface area. Incorporating TiO₂ on the surface of activated carbon via a hydrothermal process could enlarge its surface area, and therefore the photocatalytic activity. Theoretically, metal deposition on the surface of TiO₂ could create a Schottky junction, which suppresses charge recombination and enhances photocatalytic activity. Herein, we report Cu deposition on the surface of TiO₂ anchored on activated carbon (Cu-TiO₂/AC) for photocatalytic degradation of methylene blue. The Cu was deposited by a photodeposition process under UV irradiation. In contrast to the conventional hypothesis, that the Cu deposition on TiO₂/AC could exhibit an enhanced photocatalytic activity, our current result shows that the material exhibits a decrease in photocatalytic activity compared to the pristine TiO₂/AC. The same trend was also observed in other TiO₂ samples with different morphology upon Cu photodeposition. The decrease in photocatalytic activity could be correlated with the size of Cu nanoparticles and the oxidation state of Cu species. The photodeposition typically produces a relatively large Cu nanoparticle, which may serve as the recombination center for the charge carriers. Moreover, the existence of Cu⁺ and Cu²⁺ species, in addition to Cu⁰, could consume the transferred e^- from TiO₂, decreasing the e^- efficiency. This work implies that ensuring the small particle size and the existence of monovalent Cu⁰ species are critical factors for using Cu as a co-catalyst in photocatalyst materials.

TiO2是一种广泛应用于光催化领域的半导体，具有优异的化学稳定性，但其比表面积较小。通过水热法将TiO2吸附在活性炭表面，可以扩大活性炭的表面积，从而提高其光催化活性。理论上，在TiO2表面沉积金属可以形成肖特基结，从而抑制电荷重组，提高光催化活性。在此，我们报道了Cu沉积在固定在活性炭（Cu-TiO2/AC）上的TiO2表面，用于光催化降解亚甲基蓝。在紫外照射下，采用光沉积法沉积铜。与传统的假设相反，Cu沉积在TiO2/AC上可以表现出增强的光催化活性，我们目前的结果表明，与原始的TiO2/AC相比，该材料的光催化活性有所下降。在其他不同形貌的TiO2样品中也观察到同样的趋势。光催化活性的降低可能与Cu纳米颗粒的大小和Cu的氧化态有关。光沉积通常会产生较大的铜纳米颗粒，它可以作为载流子的重组中心。此外，除了Cu0外，Cu+和Cu2+的存在也会消耗TiO2转移的e-，降低e-效率。这项工作表明，确保小颗粒尺寸和单价Cu0的存在是在光催化剂材料中使用Cu作为助催化剂的关键因素。

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引用次数: 0

A comprehensive review of cold plasma technology for microalgae removal 冷等离子体去除微藻技术综述

Q1 Social Sciences

South African Journal of Chemical Engineering

Pub Date : 2025-10-01 DOI: 10.1016/j.sajce.2025.09.010

Ali Mohammad Tanzooei , Javad Karimi

Microalgae play a dual role in aquatic ecosystems, serving as crucial oxygen producers and carbon fixers while also posing significant environmental and public health risks when they grow excessively due to nutrient enrichment. Conventional physical, chemical, and biological methods for controlling harmful algal blooms (HABs) often face limitations such as high operational costs, incomplete removal, environmental toxicity, and the generation of secondary pollutants. This review explores the potential of cold plasma technology as an innovative, eco-friendly, and efficient approach for the removal of microalgae from water systems. Cold plasma generates a variety of reactive oxygen and nitrogen species (ROS/RNS) that cause oxidative stress, disrupt cell membranes, and ultimately lead to algal cell death and degradation. Various plasma systems—including dielectric barrier discharge (DBD), corona, arc, and glow discharge—have been evaluated for their effectiveness in inactivating microalgal species through both direct cell damage and nutrient depletion. Comparative studies highlight cold plasma's advantages over traditional methods, such as its chemical-free nature, scalability, energy efficiency, and rapid disinfection capabilities. Despite some challenges in cost and reactor complexity, advancements in plasma reactor design, integration with other treatment methods like photocatalysis and membrane filtration, and the development of hybrid and mobile plasma units demonstrate its growing applicability. The review concludes that cold plasma holds significant promise as a sustainable solution for microalgae control and broader water purification needs.

微藻在水生生态系统中发挥着双重作用，既是重要的氧气生产者和固定碳者，同时由于营养富集而过度生长也会带来重大的环境和公共卫生风险。控制有害藻华（HABs）的传统物理、化学和生物方法往往面临诸如操作成本高、去除不完全、环境毒性和产生二次污染物等限制。本文综述了冷等离子体技术作为一种创新的、生态友好的、高效的去除水系统微藻的方法的潜力。冷等离子体产生多种活性氧和活性氮（ROS/RNS），引起氧化应激，破坏细胞膜，最终导致藻类细胞死亡和降解。各种等离子体系统——包括介质阻挡放电（DBD）、电晕放电、电弧放电和辉光放电——已经被评估了它们通过直接细胞损伤和营养消耗来灭活微藻物种的有效性。比较研究强调了冷等离子体相对于传统方法的优势，例如其无化学物质的性质、可扩展性、能源效率和快速消毒能力。尽管在成本和反应器复杂性方面存在一些挑战，但等离子体反应器设计的进步，与其他处理方法（如光催化和膜过滤）的集成，以及混合和移动等离子体装置的发展表明其越来越多的适用性。该综述得出结论，冷等离子体作为微藻控制和更广泛的水净化需求的可持续解决方案具有重要的前景。

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引用次数: 0

Preparation and characterization of eco-friendly polymer composites from leather wastes 皮革废弃物环保高分子复合材料的制备与表征

Q1 Social Sciences

South African Journal of Chemical Engineering

Pub Date : 2025-09-12 DOI: 10.1016/j.sajce.2025.09.009

Sanjida Khan , Md. Sahadat Hossain , Mohammad Al Shahriar Khan , Afrin Rahman Akhi , Md. Farhad Ali

A large amount of hazardous waste generated by tannery industries, particularly waste leather fibers like buffing dust and trimming waste, is a big concern for a green environment. The utilization of waste leather fibers in composite fabrication can be an effective way to subside environmental pollution. On the other hand, the quantity of synthetic polymer is increasing day by day, which is a great obstacle in the way of a clean and sustainable environment. The aim of this research is proper recycling of this leather waste as well as decreasing the use of synthetic polymer. In this research, waste leather fibers such as buffing dust and trimming dust were used as a reinforcing material and unsaturated polyester resin and epoxy resin as a polymeric matrix for composite fabrication by hand lay-up technique. Different percentages of leather fibers were added to the matrix material to significantly improve its physical and mechanical properties. This study represented that among all the fabricated composites, 10 % BD/UPR reinforced composite showed the highest enhancement of mechanical properties. This research successfully utilized waste leather fibers to fabricate cost effective composites which lessened environmental pollution. The highest values of TS and TM were achieved for optimal composite, which are 24.89 N/mm² and 1336.46 N/mm², respectively, which were 40 % and 167.38 % higher than the control sample. The water absorption behavior of the fabricated composites was evaluated by the water uptake test. To observe the stability temperature of the prepared composites, the thermogravimetric analysis (TGA) test was conducted up to 700°C. The FTIR was conducted for the functional group analysis of the fabricated composites. To observe the leather fiber-matrix adhesion, scanning electron microscopy (SEM) was carried out. To sum up, the prepared composites showed improved mechanical properties suitable for commercial applications.

制革业产生的大量有害废物，特别是抛光粉尘和修剪废料等废皮革纤维，是绿色环境的一个大问题。利用废皮革纤维制造复合材料是减少环境污染的有效途径。另一方面，合成聚合物的数量日益增加，这对清洁和可持续发展的环境是一个很大的障碍。本研究的目的是适当回收这些皮革废料，以及减少合成聚合物的使用。本研究以抛光尘和修边尘等废皮革纤维为增强材料，以不饱和聚酯树脂和环氧树脂为聚合物基体，采用手工铺层法制备复合材料。在基体材料中加入不同比例的皮革纤维，可显著改善基体材料的物理力学性能。研究表明，在所有制备的复合材料中，10%的BD/UPR增强复合材料的力学性能提高最高。本研究成功地利用废皮革纤维制备了低成本的复合材料，减少了对环境的污染。最优组合的TS和TM值分别为24.89 N/mm²和1336.46 N/mm²，分别比对照样品高40%和167.38%。通过吸水试验对复合材料的吸水性能进行了评价。为了观察制备的复合材料的稳定温度，在高达700℃的温度下进行了热重分析（TGA）测试。利用红外光谱对复合材料的官能团进行了分析。采用扫描电子显微镜（SEM）观察皮革纤维与基体的粘附情况。综上所述，制备的复合材料的力学性能得到了改善，适合于商业应用。

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引用次数: 0

The synthesis of lanthanum chloride powder from Indonesian Rare earth hydroxide 以印尼氢氧化稀土为原料合成氯化镧粉体

Q1 Social Sciences

South African Journal of Chemical Engineering

Pub Date : 2025-09-12 DOI: 10.1016/j.sajce.2025.09.008

Muzakky , Suyanti , Didik Krisdiyanto , Ade Mulyawan , Devi Swasti Prabasiwi , Seta Ayu Ningtyas , Herry Poernomo , Moch. Setyadji

The application of Lanthanum chloride (LaCl₃) has recently attracted researchers in various fields such as process chemistry, application physics, and environmental conservation. The present work reports the synthesis of Lanthanum chloride from Indonesian Rare earth hydroxide (REOH). The REOH used in this study is an early-processed product of monazite minerals from Indonesian resources, thus making it a homemade product. The synthesis process of LaCl₃ from REOH began with the synthesis of La-oxalate, which calcined at 1000°C to form La₂O₃. Then, the La₂O₃ was reacted with NH₄Cl to synthesize LaOCl at 1000^оC for 5 hours, with a mol ratio of 1:60. The further chlorination process of LaOCl with HCl was done to synthesize LaCl₃ which took 3 hours of contact time. The FTIR and XRD spectrum of the final product of LaCl₃ synthesis has appeared similar to LaCl₃ from the commercial product. The XRF analysis shows that the lanthanum content in the LaCl₃ synthesis product is 50,856 % while in the commercial product is 48,058 %. Thus, the synthesis product of this study has identical specification with commercial product.

近年来，氯化镧（LaCl3）的应用吸引了过程化学、应用物理和环境保护等各个领域的研究人员。本文报道了以印尼氢氧化稀土（REOH）为原料合成氯化镧。本研究中使用的REOH是印度尼西亚资源中独居石矿物的早期加工产品，因此是国产产品。REOH合成LaCl3的过程从合成草酸la开始，草酸la在1000℃下煅烧生成La2O3。然后，将La2O3与NH4Cl在1000℃下反应5小时，摩尔比为1:60，合成LaOCl。将LaOCl与HCl进一步氯化合成LaCl3，反应时间为3 h。合成的最终产物的FTIR和XRD光谱与商品化产品的LaCl3相似。XRF分析表明，LaCl3合成产物中镧的含量为50,856%，而商品产品中镧的含量为48,058%。因此，本研究的合成产物与市售产品具有相同的规格。

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引用次数: 0

Eco-friendly synthesis, characterization of silver-doped manganese oxide nanocomposites using Rumex Nervosus Vahl leaf extract and its antibacterial activity 生态友好型合成、银掺杂氧化锰纳米复合材料及其抑菌活性研究

Q1 Social Sciences

South African Journal of Chemical Engineering

Pub Date : 2025-09-10 DOI: 10.1016/j.sajce.2025.09.006

Mihret Kendie, Bidir Kassaw, Tadesse Bizuayehu

The alarming escalation of multidrug-resistant bacteria represents a critical global health challenge, demanding innovative antimicrobial solutions. Silver manganese oxide (Ag–MnO) nanocomposites were biosynthesized from silver nitrate and manganese sulphate using an eco-friendly and cost-effective method, assisted by hydroalcoholic leaf extract of Rumex Nervosus Vahl. The successful synthesis of Ag-MnO nanocomposites was confirmed using spectroscopic (UV–Vis and FT–IR), structural (XRD), and thermal (TGA/DTA) analyses. The surface plasmon resonance peak observed at 402.89 nm from UV–Viss afirms the formation of Ag–MnO nanocomposites. In FT-IR spectral shift indicates the effective chelating ability of the plant extract for the synthesizing of Ag–MnO nanocomposites. XRD analysis revealed an average crystallite size of 29.73 nm, confirming the material’s nanoscale crystalline nature, and the TGA/DTA analysis confirmed that the synthesized nanocomposites were stable at high temperatures. The nanocomposites showed notable antibacterial activity, with a greater effect against Gram-negative than Gram-positive bacteria, as demonstrated by the disc diffusion method. These results indicate that Ag–MnO nanocomposites hold strong potential as alternative agents for combating drug-resistant infections, with promising applications in biomedical and pharmaceutical fields.

耐多药细菌的惊人升级是一项重大的全球卫生挑战，需要创新的抗微生物解决方案。摘要以硝酸银和硫酸锰为原料，利用水醇提取物合成了氧化锰银纳米复合材料。通过光谱分析（UV-Vis和FT-IR）、结构分析（XRD）和热分析（TGA/DTA）证实了Ag-MnO纳米复合材料的成功合成。紫外-可见光谱在402.89 nm处观察到表面等离子体共振峰，证实了Ag-MnO纳米复合材料的形成。FT-IR光谱位移表明植物提取物对Ag-MnO纳米复合材料的有效螯合能力。XRD分析显示平均晶粒尺寸为29.73 nm，证实了材料的纳米级结晶性质，TGA/DTA分析证实了合成的纳米复合材料在高温下是稳定的。结果表明，纳米复合材料对革兰氏阴性菌的抑菌效果优于革兰氏阳性菌。这些结果表明Ag-MnO纳米复合材料作为抗耐药感染的替代药物具有很强的潜力，在生物医学和制药领域具有广阔的应用前景。

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引用次数: 0

Efficiency and accuracy comparison of machine learning algorithms for predicting US energy consumption across sectors 预测美国各部门能源消耗的机器学习算法的效率和准确性比较

Q1 Social Sciences

South African Journal of Chemical Engineering

Pub Date : 2025-09-10 DOI: 10.1016/j.sajce.2025.09.001

Seyed Matin Malakouti, Mohammad Bagher Menhaj, Amir Abolfazl Suratgar

This study uses machine learning algorithms to predict energy consumption across the United States's critical sectors (commercial, residential, transportation, and industrial). The Ridge algorithm emerged as the most accurate and efficient in predicting energy consumption, outperforming other algorithms such as Lasso Regression, Elastic Net, Extra Tree, Random Forest, K Neighbors, and Orthogonal Matching Pursuit. The study employed data collection, feature engineering, model training, and evaluation based on metrics like MAPE, RMSLE, RMSE, MSE, and MAE, alongside speed evaluations. Key findings highlight the superior performance of the Ridge algorithm across residential, industrial, and commercial sectors in terms of accuracy (low MSE values) and computational efficiency. Additionally, the Orthogonal Matching Pursuit algorithm showed promise in predicting energy consumption in the transportation sector. These results provide valuable insights for energy management strategies, emphasizing the importance of accurate energy consumption predictions in effective power distribution and outage risk reduction.

本研究使用机器学习算法来预测美国关键部门（商业、住宅、交通和工业）的能源消耗。Ridge算法在预测能源消耗方面表现得最为准确和高效，优于Lasso Regression、Elastic Net、Extra Tree、Random Forest、K Neighbors和Orthogonal Matching Pursuit等其他算法。该研究采用数据收集、特征工程、模型训练和基于MAPE、RMSLE、RMSE、MSE和MAE等指标的评估，以及速度评估。主要研究结果突出了Ridge算法在住宅、工业和商业领域的精度（低MSE值）和计算效率方面的优越性能。此外，正交匹配追踪算法在预测交通运输部门的能源消耗方面显示出前景。这些结果为能源管理策略提供了有价值的见解，强调了准确的能源消耗预测在有效配电和减少停电风险中的重要性。

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引用次数: 0

Formulation and characterization of ultrasound-assisted cinnamon essential oil nanoemulsions and its antifungal activity 超声辅助肉桂精油纳米乳的制备、表征及其抗真菌活性

Q1 Social Sciences

South African Journal of Chemical Engineering

Pub Date : 2025-09-10 DOI: 10.1016/j.sajce.2025.09.005

Jia Zhenhua , Naris Barnthip , Pichet Limsuwan , Voranuch Thongpool

The increasing demand for safer, more natural antimicrobial agents has driven interest in plant-derived essential oils as alternatives to synthetic preservatives. In this study, cinnamon essential oil nanoemulsions were successfully prepared using high-speed homogenization followed by ultrasonication method, with Tween-80 serving as a surfactant. The resulting nanoemulsions were characterized by dynamic light scattering (DLS), Fourier-transform infrared spectroscopy (FTIR), and UV–visible spectroscopy. The nanoemulsions exhibited droplet sizes below 22 nm, low polydispersity indices (PDI), and negative zeta potentials, indicating good stability. FTIR analysis confirmed the presence of characteristic functional groups, while UV–vis spectra revealed absorption peaks associated with cinnamaldehyde, the major component of the essential oil. Storage stability tests at 4 °C over seven days demonstrated minimal changes in droplet size, PDI, and zeta potential. Importantly, antifungal assays revealed that nanoemulsions containing 5–9 % cinnamon essential oil effectively inhibited the growth of Penicillium pinophilum, with inhibition zones up to 23.7 mm. These findings suggest that cinnamon essential oil nanoemulsions offer a promising, natural strategy for antifungal applications in food preservation and related industries.

对更安全、更天然的抗菌剂的需求日益增长，促使人们对植物源性精油作为合成防腐剂的替代品产生了兴趣。本研究以吐温-80为表面活性剂，采用高速均质-超声法制备肉桂精油纳米乳液。采用动态光散射（DLS）、傅里叶变换红外光谱（FTIR）和紫外可见光谱对制备的纳米乳进行了表征。所制得的纳米乳液粒径小于22 nm，多分散性指数（PDI）低，ζ电位为负，稳定性好。FTIR分析证实了特征官能团的存在，而紫外可见光谱显示了与肉桂醛相关的吸收峰，肉桂醛是精油的主要成分。在4°C下超过7天的储存稳定性测试表明，液滴大小、PDI和zeta电位的变化很小。重要的是，抗真菌实验显示，含有5 - 9%肉桂精油的纳米乳液有效抑制了嗜红青霉菌的生长，抑制区高达23.7 mm。这些发现表明，肉桂精油纳米乳液在食品保鲜和相关行业的抗真菌应用中提供了一种很有前途的天然策略。

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引用次数: 0

Green fabrication of p-n CuO/ZnO heterojunctions for efficient photocatalytic degradation of dyes 绿色制备用于高效光催化降解染料的p-n CuO/ZnO异质结

Q1 Social Sciences

South African Journal of Chemical Engineering

Pub Date : 2025-09-10 DOI: 10.1016/j.sajce.2025.09.007

Atheel Alwash

The heterojunction photocatalyst of CuO/ZnO has attracted considerable interest due to its superior ability to degrade organic pollutants through photocatalytic processes. In this research, CuO/ZnO heterojunctions were successfully synthesized by thermal combustion technique. The structural, morphological, and optical characteristics of the resulting materials were extensively analyzed using various characterization methods. Diffraction studies confirmed the presence of both CuO and ZnO phases, with an average crystalline size of 29.625 nm. These findings were corroborated by TEM analysis, which also highlighted the particle size and geometric shape. BET analysis revealed a mesoporous structure with a surface area of 4.18 m²/g. The band gap energy of the catalyst was determined to be 1.48 eV, attributed to the interaction between copper and zinc oxides. The Photoluminescence (PL) indicates the reduction in PL intensity of CuO-ZnO/GA compared to ZnO/GA ascribed to the reduction in electron–hole Coulombic attraction. The photocatalytic efficiency of the CuO/ZnO heterojunction was assessed by its degradation of methylene blue (MB) dye, achieving 97% removal. This enhanced in catalytic efficiency was attributed to the effective separation of electron-hole pairs and the extended absorption range into the visible light spectrum.

CuO/ZnO异质结光催化剂由于其优异的光催化降解有机污染物的能力而引起了人们的广泛关注。在本研究中，利用热燃烧技术成功合成了CuO/ZnO异质结。使用各种表征方法广泛分析了所得材料的结构、形态和光学特性。衍射研究证实了CuO相和ZnO相的存在，平均晶粒尺寸为29.625 nm。这些发现被TEM分析证实，也突出了颗粒的大小和几何形状。BET分析显示，该材料具有4.18 m²/g的介孔结构。结果表明，该催化剂的带隙能为1.48 eV，为氧化铜和氧化锌相互作用的结果。光致发光（PL）表明，与ZnO/GA相比，CuO-ZnO/GA的发光强度降低是由于电子-空穴库仑吸引力的降低。通过对亚甲基蓝（MB）染料的降解，评价了CuO/ZnO异质结的光催化效率，去除率达到97%。催化效率的提高是由于电子-空穴对的有效分离和可见光吸收范围的扩大。

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