Colloids and Surfaces A: Physicochemical and Engineering Aspects最新文献_第7页

An air-breathing hydrocarbon-vapor bubble from a surfactant film 从表面活性剂薄膜中产生的可呼吸的碳氢化合物蒸汽泡

IF 5.4 2区化学

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-10-03 DOI: 10.1016/j.colsurfa.2025.138548

Dennis K. Kim , Ramagopal Ananth

{"title":"An air-breathing hydrocarbon-vapor bubble from a surfactant film","authors":"Dennis K. Kim , Ramagopal Ananth","doi":"10.1016/j.colsurfa.2025.138548","DOIUrl":"10.1016/j.colsurfa.2025.138548","url":null,"abstract":"<div><div>Growth and stability of surfactant bubbles containing hydrocarbon vapor are not well understood and are fundamental to foams used in firefighting to pharmaceuticals applications. Here, we consider growth of a single vapor-bubble in isolation rather than in foams to better understand the gas permeability through its lamella, rupture dynamics, and the effects of hydrocarbon-vapor and surfactants. We show that an evaporating n-pentane liquid placed inside a capillary tube pushes a surfactant film down the tube and inflates it into a bubble attached to the tube-exit. Astonishingly, the bubble volume increases at a constant rate independent of time and the rate is significantly greater than the influx of vapor into the bubble for a fluorosurfactant. The measured rate is constant despite the increasing bubble surface area and decreasing lamella thickness with time. We formulate a hypothesis that ambient air permeates through the thinnest part of the lamella around the tube exit rather than the entire bubble surface and prevents saturation of the bubble with vapor. We develop a theory to predict lamella-permeability and vapor concentration in the bubble. The theory shows for the first time that the fluorosurfactant lamella is nearly impermeable to n-pentane vapor but permeable to ambient air. Trisiloxane-polyoxyethylene surfactant bubble also breaths in air similar to the fluorosurfactant but with much shorter rupture time and maximum bubble volume. We also show that the bubble rupture time can be increased by increasing the fluorosurfactant concentration, up to hundred times the critical micelle concentration, which has not been recognized previously.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"728 ","pages":"Article 138548"},"PeriodicalIF":5.4,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145263880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cellulose-based shape change smart material responding to moisture and light 基于纤维素的形状改变智能材料对水分和光线的反应

IF 5.4 2区化学

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-10-03 DOI: 10.1016/j.colsurfa.2025.138542

Sanan Rezaei, Saeid Azizian

{"title":"Cellulose-based shape change smart material responding to moisture and light","authors":"Sanan Rezaei, Saeid Azizian","doi":"10.1016/j.colsurfa.2025.138542","DOIUrl":"10.1016/j.colsurfa.2025.138542","url":null,"abstract":"<div><div>Over the past few years, researchers have focused on smart materials that respond to multiple stimuli. Using these materials, they can create soft robots that can replace more complex robots. Multi-response properties, very easy manufacturing with the cheapest materials, controllable smart deformation, and applicability in various industries are all very important for the development of intelligent soft robots. Since light and humidity are two available stimuli, here we report a type of cellulose-based smart sensor responsive to humidity and light, which can be used in the construction of cheap and soft robots. This sensor is easily made by heating thermal paper. As humidity increases, this sensor absorbs water molecules and changes shape. When light is illuminated on it, it desorbs the water molecules and returns to its original state. When the sensor is exposed to 100 % humidity, it can rotate about 552° with the speed of 6 °/s and return to its original position at a speed of 3 °/s when illuminated with infrared light. Due to its high response rate to both humidity and infrared light, various applications for the fabricated sensor are presented.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"728 ","pages":"Article 138542"},"PeriodicalIF":5.4,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of particle size and hydroxyaluminum oligocations on tungstate immobilization by weathered clay minerals 粒度和羟基铝寡聚对风化粘土矿物固定钨酸盐的影响

IF 5.4 2区化学

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-10-03 DOI: 10.1016/j.colsurfa.2025.138549

Huining Zhang , Xiaojie Hu , Qi Li , Gaofeng Wang , Sili Ren , Wuhui Luo

{"title":"Effects of particle size and hydroxyaluminum oligocations on tungstate immobilization by weathered clay minerals","authors":"Huining Zhang , Xiaojie Hu , Qi Li , Gaofeng Wang , Sili Ren , Wuhui Luo","doi":"10.1016/j.colsurfa.2025.138549","DOIUrl":"10.1016/j.colsurfa.2025.138549","url":null,"abstract":"<div><div>In laboratory tests, metal (hydro)oxides showed greater adsorption amounts for tungsten (W)—a emerging contaminant—than common aluminosilicates in aqueous systems. However, in actual soils, the often-overlooked yet ubiquitous clay minerals have recently been proposed as important components in the retardation of W(VI) transport. To address this discrepancy, montmorillonite (Mt), kaolinite (Kt), and illite (Ilt) of different sizes were prepared by gradient centrifugation, freeze–thaw, and/or intercalation protocols and subsequently modified via hydroxyaluminum (HyA) and hydroxyaluminosilicate (HAS) oligocations to simulate their natural states and interactions with W(VI) in soil. For all three clay minerals, the smaller particles possessed higher HyA or HAS contents. Additionally, Mt showed the larger loading amounts for two oligocations compared to Kt and Ilt. HyA or HAS loading significantly increased W(VI) uptake, negligibly influenced the adsorption kinetics, and improved the pH resistance. At low concentrations, the clay minerals loaded by HAS showed greater adsorption amounts of W(VI) than those loaded by HyA. The adsorption of W(VI) on unmodified Kt and HyA- or HAS-loaded clay minerals were increased by increasing ionic strength, suggesting the complexation mechanism. HyA-loaded small Kt and Mt induced the polymerization of monomeric tungstate on their surfaces, corresponding to an open-chain and a proximal polymerization models, respectively. Release of the polymerized W(VI) was related to the clay mineral type and W(VI) concentration. These findings offer novel insights into the fixation characteristics and mechanisms of W(VI) by soil clay minerals, thereby shedding light on the colocalization of W with Si/Al in natural soils.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"728 ","pages":"Article 138549"},"PeriodicalIF":5.4,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Engineering defects in Bi2S3 nanorods using thermal alkaline corrosion enables efficient tetracycline adsorption and photodegradation 利用热碱性腐蚀对Bi2S3纳米棒进行工程缺陷处理，实现了对四环素的高效吸附和光降解

IF 5.4 2区化学

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-10-03 DOI: 10.1016/j.colsurfa.2025.138551

Zehao Li , Wangzhe Xia , Jianhong Wu , Wuzu Ha , Jun Wang , Yamin Chai , Xianze Yin

{"title":"Engineering defects in Bi2S3 nanorods using thermal alkaline corrosion enables efficient tetracycline adsorption and photodegradation","authors":"Zehao Li , Wangzhe Xia , Jianhong Wu , Wuzu Ha , Jun Wang , Yamin Chai , Xianze Yin","doi":"10.1016/j.colsurfa.2025.138551","DOIUrl":"10.1016/j.colsurfa.2025.138551","url":null,"abstract":"<div><div>The efficient removal of antibiotics prevalent in aquatic environments due to widespread misuse presents an urgent environmental challenge. Among various remediation strategies, the integration of adsorption and photocatalytic degradation offers a promising solution. While bismuth-based inorganic materials have emerged as environmentally benign photocatalysts with favourable photostability, their inherent limitations in adsorption capacity toward organic contaminants remain a critical drawback. Herein, we report a thermal alkaline corrosion strategy to engineer defects in Bi<sub>2</sub>S<sub>3</sub> nanorods through controlled surface etching. This defect engineering approach significantly enhances both adsorption affinity and photocatalytic activity by simultaneously increasing specific surface area, reducing interparticle aggregation, and exposing reactive sites. The optimized Bi<sub>2</sub>S<sub>3</sub>-6 demonstrates exceptional tetracycline adsorption capacity (120.31 mg/g) and achieves 98.1 % degradation efficiency within 90 min under simulated solar irradiation. Notably, the photocatalytic performance remains unaffected by pH variations, coexisting inorganic ions, and different water sources, with sustained activity under real sunlight conditions. This study highlights the potential of defect-engineered bismuth-based catalysts in addressing antibiotic contamination in wastewater, offering a feasible strategy for developing high-performance photocatalysts and providing a sustainable solution for environmental remediation and green energy applications.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"728 ","pages":"Article 138551"},"PeriodicalIF":5.4,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145264087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surface oxidation mechanisms for selective separation of chalcopyrite and pyrite by hypochlorite at high altitude 次氯酸盐在高海拔条件下选择性分离黄铜矿和黄铁矿的表面氧化机理

IF 5.4 2区化学

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-10-02 DOI: 10.1016/j.colsurfa.2025.138530

Yan Miao, Hong Zheng, Guangke Ye, Qing Shi, Guofan Zhang

{"title":"Surface oxidation mechanisms for selective separation of chalcopyrite and pyrite by hypochlorite at high altitude","authors":"Yan Miao, Hong Zheng, Guangke Ye, Qing Shi, Guofan Zhang","doi":"10.1016/j.colsurfa.2025.138530","DOIUrl":"10.1016/j.colsurfa.2025.138530","url":null,"abstract":"<div><div>High-altitude areas possess abundant high-quality copper (Cu) resources, driving global mining development toward these areas. However, the low-pressure environment at high altitudes significantly reduced dissolved oxygen (DO) content in pulp (conventional low-altitude DO=8.2 mg/L), thereby altering the redox behavior at sulfide mineral interfaces and adversely affecting the flotation separation of chalcopyrite and pyrite. The study revealed that under a pH of 12.0, the DO content in high-altitude areas (4600 m, DO = 4.0 mg/L) inhibited the oxidative corrosion of pyrite, leading to a sharp decrease in calcium ion (Ca²⁺) adsorption (from 1.5 ×10⁻⁵ to 0.4 ×10⁻⁵ mol/g), thereby increasing the difficulty of its inhibition. Sodium hypochlorite exhibits stronger oxidizing capacity than oxygen, disrupting the surface structure of pyrite, exposing more hydroxylated iron and sulfate species. The enhanced Ca²⁺ adsorption capacity (0.7 ×10⁻⁵ mol/g) and reduced xanthate adsorption (from 2.9 ×10⁻⁷ to 2.6 ×10⁻⁷ mol/g) enhanced its inhibitory effect. By employing NaClO-enhanced oxidation and extended flotation time, the Cu grade of the concentrate from production samples in high-altitude areas increased from 18.86 % to 20.83 %, demonstrating improved separation efficiency. The enhanced oxidation process proposed in this study provided a theoretical foundation and engineering guidance for the development of Cu resources in high-altitude areas.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"728 ","pages":"Article 138530"},"PeriodicalIF":5.4,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on oil-water interface self-assembly and ultra-low tension mechanism of betaine and internal olefin sulfonate mixed system 甜菜碱与内部烯烃磺酸盐混合体系油水界面自组装及超低张力机理研究

IF 5.4 2区化学

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-10-02 DOI: 10.1016/j.colsurfa.2025.138529

Jiaxin Wang , Jiang Yang , Gen li , Jiaxing Li , Xiang Li , Lei Zhang , Lu Zhang , Qi Sun

{"title":"Study on oil-water interface self-assembly and ultra-low tension mechanism of betaine and internal olefin sulfonate mixed system","authors":"Jiaxin Wang , Jiang Yang , Gen li , Jiaxing Li , Xiang Li , Lei Zhang , Lu Zhang , Qi Sun","doi":"10.1016/j.colsurfa.2025.138529","DOIUrl":"10.1016/j.colsurfa.2025.138529","url":null,"abstract":"<div><div>As a novel temperature-resistant and salt-tolerant surfactant, internal olefin sulfonate has attracted extensive attention in recent years. Nevertheless, to date, most studies on its oil-water interfacial properties have focused on the impact of reservoir environments, while research on the interfacial self-assembly of its mixed systems remains relatively few. In this paper, the interfacial self-assembly behavior of linear alkyl betaine (ASB) and internal olefin sulfonates (IOS-C<sub>18</sub>, IOS-C<sub>24</sub>) with total carbon number of branched alkyl of 18 and 24 was investigated using the spinning drop method, and the influence of oil phase properties was further investigated. The experimental results indicate that the branched structure of the hydrophobic group in internal olefin sulfonate exhibits a certain self-regulating capacity, which not only has a certain interfacial activity, but also can make up for the adsorption void of betaine molecules on the oil-water interface. Under optimal hydrophilic-lipophilic balance (HLB), the composite system can reduce the n-decane-water interfacial tension (IFT) to an ultra-low level. Meanwhile, the properties of the oil phase represent a key factor affecting the composition and structure of mixed adsorption film. The fractions in Shengli crude oil compete with surfactant molecules for adsorption; consequently, the oil-water IFT is high. In contrast, the small-molecule active components in Changqing crude oil can be mixed with the system, exhibiting low branching degree, and the IFT is low. The research on the structure and properties of mixed adsorption films provides a reliable theoretical basis for the field application of internal olefin sulfonate and its mixed system in high-temperature and high-salinity reservoirs.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"728 ","pages":"Article 138529"},"PeriodicalIF":5.4,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Properties and performance of natural cellulosic fiber-reinforced polybenzoxazine composites as corrosion inhibitors under saline conditions 天然纤维素纤维增强聚苯并恶嗪复合材料在盐水条件下作为缓蚀剂的性质和性能

IF 5.4 2区化学

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-10-02 DOI: 10.1016/j.colsurfa.2025.138506

S. Malathi Devi, D. Madhavan, K. Jeyasubramanian, A. Vimalraj, R. Antony

{"title":"Properties and performance of natural cellulosic fiber-reinforced polybenzoxazine composites as corrosion inhibitors under saline conditions","authors":"S. Malathi Devi, D. Madhavan, K. Jeyasubramanian, A. Vimalraj, R. Antony","doi":"10.1016/j.colsurfa.2025.138506","DOIUrl":"10.1016/j.colsurfa.2025.138506","url":null,"abstract":"<div><div>Corrosion is still a billion-dollar problem, and inhibiting corrosion via sustainable routes seems an excellent strategy. This work attempts new corrosion inhibitors, i.e., natural fiber-reinforced polybenzoxazine (BXP) composites, prepared by a facile solvent-less <em>in situ</em> polymerization (melt condensation). Six sustainable resources (palmyra palm leaves, abaca, cotton, coconut shell coir, raw jute, and rice straw) have been used to acquire natural fibers. The mechanical strength of BXP has been remarkably improved after incorporating natural fibers. The composite made from BXP and banana fiber shows better stability, i.e., up to 232.7 ºC, and yields a higher percentage of char residue (55 %) at 600 ºC. Varnish coating dispersed with natural fiber-reinforced BXP efficiently protects the mild steel from corrosion in 3.5 % NaCl, as evidenced by potentiodynamic polarization studies and EIS analysis. Especially, the corrosion rate of mild steel is 96.85 % and 99.9 % decreased after being coated with BXP and fiber-reinforced composite, respectively, indicating the excellent corrosion inhibition efficiency of the prepared composites. In addition to the corrosion inhibition ability, the higher hardness, thermal stability, and incorporation of sustainable materials highlight the multifunctional nature of the prepared composites for future applications targeting sustainable development.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"728 ","pages":"Article 138506"},"PeriodicalIF":5.4,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145263995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Catalytic nanofiber composite membrane with bimetal heterojunction enabling dynamic photo-Fenton degradation for efficient and multitasking pollutants removal 具有双金属异质结的催化纳米纤维复合膜，可实现动态光- fenton降解，高效多任务去除污染物

IF 5.4 2区化学

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-10-02 DOI: 10.1016/j.colsurfa.2025.138536

Jin Han , Wanju Zhang , Lilan Huang , Jianyu Wu , Haojie Chen , Zhanxiao Wang , Xin Nie , Yujun Zhang

{"title":"Catalytic nanofiber composite membrane with bimetal heterojunction enabling dynamic photo-Fenton degradation for efficient and multitasking pollutants removal","authors":"Jin Han , Wanju Zhang , Lilan Huang , Jianyu Wu , Haojie Chen , Zhanxiao Wang , Xin Nie , Yujun Zhang","doi":"10.1016/j.colsurfa.2025.138536","DOIUrl":"10.1016/j.colsurfa.2025.138536","url":null,"abstract":"<div><div>With the increasing complexity of wastewater, the development of catalytic membranes featuring heterojunctions of catalysts combined with advanced oxidation techniques has become a promising approach for wastewater treatment. This study prepared a heterostructured bimetal-based polyetherimide (PEI) catalytic membrane (HBPCM) via electrospinning and <em>in-situ</em> growth. The Z-type heterojunction of FeOOH and ZnO enhanced electron mobility, reducing photoluminescence intensity, Nyquist arc radius, and increasing photocurrent response, thereby improving redox and photocatalytic performance. Integrating photo-Fenton and membrane processes facilitated dynamic catalytic reaction, enhancing pollutant degradation through improved mass transfer. The photo-Fenton degradation of HBPCM for methyl orange (MO), orange G (OG), methylene blue (MB) and phenol (phOH) in static experiments reached 96.6 %, 87.5 %, 92.3 % and 95.7 % within 10 min, which were much higher than that of iron-based PEI catalytic membrane (IPCM) or zinc-based PEI catalytic membrane (ZPCM) in single photocatalysis or Fenton catalysis process. In dynamic experiments, photo-Fenton efficiency of HBPCM for MO, OG, MB, and phOH in 10 min was 8.55, 8.25, 6.86, and 2.69 times higher than in static conditions. Furthermore, loading FeOOH/ZnO conferred superhydrophilicity to the membrane, enhancing oil-water separation performance. Combining membrane technology with photo-Fenton catalysis offers an effective approach for treating complex wastewater.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"728 ","pages":"Article 138536"},"PeriodicalIF":5.4,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Green synthesis of ZnO and CuO nanoparticles and ZnO-CuO nanocomposites: Characterization and photocatalytic dyes removal efficiency’s determination ZnO和CuO纳米颗粒及ZnO-CuO纳米复合材料的绿色合成：表征及光催化染料去除率的测定

IF 5.4 2区化学

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-10-02 DOI: 10.1016/j.colsurfa.2025.138544

Imane Meriem Khaled , Muhammad Umair , Claudio Maria Pecoraro , Abdehakim Kheniche , Marianna Bellardita , Soufiane Soltani

{"title":"Green synthesis of ZnO and CuO nanoparticles and ZnO-CuO nanocomposites: Characterization and photocatalytic dyes removal efficiency’s determination","authors":"Imane Meriem Khaled , Muhammad Umair , Claudio Maria Pecoraro , Abdehakim Kheniche , Marianna Bellardita , Soufiane Soltani","doi":"10.1016/j.colsurfa.2025.138544","DOIUrl":"10.1016/j.colsurfa.2025.138544","url":null,"abstract":"<div><div>This study reports the green biogenic synthesis of zinc oxide (ZnO) and copper oxide (CuO) nanoparticles, as well as ZnO–CuO nanocomposites, using an aqueous extract of <em>Capparis spinosa</em> L. leaves. The prepared nanomaterials were extensively characterized, and their photocatalytic performance was assessed under simulated solar light irradiation and ambient conditions for the degradation of anionic (Rose Bengal) and cationic (Rhodamine B) dyes as model of wastewater pollutants. The crystal structure of the photocatalysts was examined using X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) was employed to disclose the powder's morphology, and Fourier-transform infrared spectroscopy (FTIR) highlighted the role of plant-derived biomolecules as capping and stabilizing agents. Thermogravimetric analysis (TGA) allowed the evaluation of the nanoparticles’ stability, while optical and electrochemical measures were performed to study the electronic behavior of the photocatalysts. After 2 h of irradiation in the presence of 0.3 g/l of ZnO, CuO, or ZnO–CuO, the conversion of Rose Bengal reached 97.1 %, 87.8 %, and 99.9 %, respectively, while 27.5 %, 17.8 %, and 33.9 % were the values obtained for Rhodamine B. This finding demonstrates the effectiveness of our synthesis method as a green and sustainable approach in developing highly active photocatalysts for environmental remediation.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"728 ","pages":"Article 138544"},"PeriodicalIF":5.4,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145264007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cerium dioxide nanoparticles in PMAO-Jeffamine brush copolymer for sustained redox activity in cellular environments 二氧化铈纳米粒子在PMAO-Jeffamine电刷共聚物中的持续氧化还原活性在细胞环境中

IF 5.4 2区化学

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-10-02 DOI: 10.1016/j.colsurfa.2025.138545

Olga A. Goryacheva , Pavel D. Strokin , Andrey M. Burov , Kiril Y. Presnyakov , Ekaterina S. Prikhozhdenko , Viktoriia A. Anikina , Elizaveta A. Zamyatina , Roman I. Romanov , Nikita N. Chukavin , Andrey M. Markeev , Nelli R. Popova

{"title":"Cerium dioxide nanoparticles in PMAO-Jeffamine brush copolymer for sustained redox activity in cellular environments","authors":"Olga A. Goryacheva , Pavel D. Strokin , Andrey M. Burov , Kiril Y. Presnyakov , Ekaterina S. Prikhozhdenko , Viktoriia A. Anikina , Elizaveta A. Zamyatina , Roman I. Romanov , Nikita N. Chukavin , Andrey M. Markeev , Nelli R. Popova","doi":"10.1016/j.colsurfa.2025.138545","DOIUrl":"10.1016/j.colsurfa.2025.138545","url":null,"abstract":"<div><div>High-temperature organic synthesis allowed to obtain nanoparticles of cerium oxide (CeO₂ NPs) with a size of 7 nm and with oleic acid on the surface. Brush polymer, often used as an encapsulation agent for low-molecular substances, was used to encapsulate a legion of nanoparticles simultaneously. The use of a cheap polymeric structure based on poly(maleic anhydride-alt-1-octadecene) (PMAO) conjugated with Jeffamine allowed to obtain nanoparticles with a size of about 100 nm. Multilayer polymer shell preserves the pronounced autocatalytic properties of CeO₂ NPs and leaves oleic acid on their surface. It has been demonstrated that the synthesized nanoparticles do not exhibit a cytotoxic effect against NCTC L929 and MCF-7 cell cultures at concentrations ranging from 10<sup>−6</sup> to 10<sup>−5</sup> M. However, a moderate cytotoxic effect (below the IC50) is observed at a concentration of 10<sup>−4</sup> M following a 72-hour co-incubation of nanoparticles with cells. It was determined that the polymer coating (PMAO-Jeffamine) does not hinder the catalytic functions of cerium, as evidenced by the model of oxidative stress induced by radiation, wherein the catalytic binding sites maintain accessibility. Furthermore, the selective redox activity of nanoparticles against cancerous and normal cells is observed, which can be utilized for biomedical purposes in the development of nanomaterials that enhance the effectiveness of radiation therapy.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"728 ","pages":"Article 138545"},"PeriodicalIF":5.4,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145264084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0