Colloids and Surfaces A: Physicochemical and Engineering Aspects最新文献

{"title":"The immiscible to miscible transition and its consequences for 3-phase displacements in porous media of arbitrary wettability: Comparison of 3D pore network results with basic theory","authors":"S. Mahmoudvand ,&nbsp;Z. Jiang ,&nbsp;C. Zhou ,&nbsp;K.S. Sorbie ,&nbsp;A. Skauge","doi":"10.1016/j.colsurfa.2024.135673","DOIUrl":"10.1016/j.colsurfa.2024.135673","url":null,"abstract":"<div><div>The theory of the immiscible to miscible transition and its consequences for 3-phase displacements in a system of arbitrary wettability distribution has been studied in a previous paper using a “process based” model through the simplest case possible; a capillary bundle (CB) model. As expected, the CB model was not able to capture many realistic phenomena such as phase trapping, film and layer-flow, topological effects etc. However, it was recognized that it should be able to indicate certain expected qualitative trends in 3-phase displacements in real 3D connected networks.</div><div>The current paper extends that earlier work by showing the consequences of changing the model of the porous medium to a 3D connected lattice pore network model (PNM) to capture phase trapping and rock connectivity. Initially a simple 3D regular cubic bond lattice is used for this initial work to make a clear comparison with the CB model. Two important characteristics of 3D network refer to (i) displacement phase accessibility, and (ii) defending phase trapping/escape. Three trapping/escape cases based on the probability of invading phase accessibility and defending phase escape have been defined in the 3D lattice network. Networks with different coordination numbers (z = 6 and 4) were studied in order to mimic different rock connectivity and study <em>how and in which way</em> the applied rules result in specific changes in 3-phase saturation paths, 3-phase pore occupancies and phase trapping. Again the focus is on the changes which are predicted to occur in all these quantities as the system moves from an immiscible (IFT σ_go ∼ “large”) to a miscible (σ_go → 0) case.</div><div>In this paper, a weakly oil-wet (WOW) wettability distribution is considered and various phase invasions (gas, water, and oil) in the corresponding 2-phase systems are investigated. Both saturation paths and pore occupancy sequences of different phase invasions under different miscibility conditions are presented for both the CB and PNM models. It is found that having a well-connected network and considering a relaxed rule on defending and displacing phases, the results are quite similar to that of the CB model. Also, applying restricted trapping/escaping rules and less connected network mean deviation from the CB model, but the underlying physics of the immiscible to miscible transitions and the central physical parameter of 3-phase displacements in all cases are the same as those observed for the CB model.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"705 ","pages":"Article 135673"},"PeriodicalIF":4.9,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comprehensive investigation of boric acid-free electrodeposition of Ni-P alloy on steel","authors":"Susana Devesa ,&nbsp;Gabriel Santos ,&nbsp;Diogo Cavaleiro ,&nbsp;Mariana Lopes ,&nbsp;Ana Sofia Ramos ,&nbsp;Sandra Carvalho","doi":"10.1016/j.colsurfa.2024.135678","DOIUrl":"10.1016/j.colsurfa.2024.135678","url":null,"abstract":"<div><div>In this study, the feasibility of depositing boric acid-free Ni-P coatings using electroplating techniques was investigated, with a focus on safety considerations. A comparison of these coatings with conventional boric acid-containing ones was conducted, examining various properties such as structure, morphology, roughness, brightness, wettability, and hardness. Notably, the absence of boric acid led to a decrease in deposition rate and increased surface roughness. However, it also promoted a higher phosphorus content in the coatings. Both conditions showed similar colors and hydrophobic behavior tendency, with the heat treatment promoting no significant change in this behavior for the boric acid-free coating. The same occurred for the mechanical properties (hardness and Young’s modulus) where no significant differences were found for either of the conditions tested. These findings demonstrate that boric acid-free coatings can retain their functional properties while addressing safety concerns associated with hazardous boric acid.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"705 ","pages":"Article 135678"},"PeriodicalIF":4.9,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142573064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical investigation of droplet impacting, spreading and penetration on porous substrates","authors":"Fangfang Zhang ,&nbsp;Shuyan Che ,&nbsp;Jingdan Tang ,&nbsp;Hao Yin","doi":"10.1016/j.colsurfa.2024.135658","DOIUrl":"10.1016/j.colsurfa.2024.135658","url":null,"abstract":"<div><div>The behavior of droplets impacting porous surfaces, including spreading and penetration, plays a critical role in various engineering applications, yet the underlying mechanisms governing the interaction between these processes remain unclear. In this study, the complex interplay between droplet spreading and penetration on porous media was comprehensively investigated using the Level Set method. The droplet evolutions outside and inside the porous substrate influenced by droplet size, impact velocity, porosity, particle diameter, surface tension, and dynamic viscosity were explored. The results indicate that increases in droplet size and velocity lead to a simultaneous increase in both spreading factor and penetration depth. Higher values of porosity, particle diameter, and surface tension facilitated droplet penetration, despite at the expense of impeding droplet spreading on porous surfaces. Droplet size and surface tension exhibited less pronounced effects on penetration depth, particularly during the early stages. The spreading factor exhibited a non-monotonic trend with viscosity, initially increasing and subsequently decreasing, while the penetration depth decreased accordingly. Moreover, a larger spreading diameter corresponds to an expanded penetration width. A correlation was proposed to predict the maximum spreading factor based on Weber number, Reynolds number, and Darcy number, which can predict 83 % data in literature with deviations within ±20 %. This study provides new insights into the droplet dynamics on porous media and offers practical guidance for optimizing relevant engineering applications.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"705 ","pages":"Article 135658"},"PeriodicalIF":4.9,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142573042","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}

{"title":"Modified Donnan model for ion binding to small soft nano particles","authors":"Luuk K. Koopal ,&nbsp;Takumi Saito ,&nbsp;Marcelo Avena","doi":"10.1016/j.colsurfa.2024.135665","DOIUrl":"10.1016/j.colsurfa.2024.135665","url":null,"abstract":"<div><div>The charge density of soft nano particles (NPs) can be described with a site binding model in combination with an electrostatic model. When the ionic strength, <em>I</em>, is dominated by a moderate 1–1 electrolyte concentration, the electrostatic interaction can be approximated with the classical Donnan model for <em>large</em> soft NPs. For <em>small</em> soft NPs, the empirical modified Donnan (<em>mD</em>) model, based on a modified Donnan volume, <span><math><msub><mrow><mi>V</mi></mrow><mrow><mi>mD</mi></mrow></msub></math></span>, can be used to obtain an <em>average</em> particle potential,<span><math><msub><mrow><mspace></mspace><mi>ψ</mi></mrow><mrow><mi>mD</mi></mrow></msub></math></span>, but the physical background is somewhat obscure. Therefore, the <span><math><mi>mD</mi></math></span> model is discussed using the Poisson-Boltzmann theory. <span><math><msub><mrow><mi>V</mi></mrow><mrow><mi>mD</mi></mrow></msub></math></span> is determined by the specific volume of the ‘<em>intra’</em> plus <em>‘extra’</em> particle diffuse charge, and it is shown that <span><math><msub><mrow><mi>ψ</mi></mrow><mrow><mi>mD</mi></mrow></msub></math></span> is a volumetric average of the intra particle potentials and the surface potential. Theoretical equations for <span><math><msub><mrow><mi>V</mi></mrow><mrow><mi>mD</mi></mrow></msub></math></span> are derived for plate, disk and spherical geometries. In general, <span><math><mrow><msub><mrow><mi>V</mi></mrow><mrow><mi>mD</mi></mrow></msub><mo>=</mo><mi>S</mi><msub><mrow><mi>V</mi></mrow><mrow><mi>p</mi></mrow></msub><mi>R</mi></mrow></math></span>, where <span><math><mrow><mi>S</mi><msub><mrow><mi>V</mi></mrow><mrow><mi>p</mi></mrow></msub></mrow></math></span> is a specific soft particle volume, and <em><strong>R</strong></em> is a measure of the effect of extra particle diffuse layer on <span><math><msub><mrow><mi>V</mi></mrow><mrow><mi>mD</mi></mrow></msub></math></span>. When limited information about the NP is available, the theoretical equation for <span><math><msub><mrow><mi>V</mi></mrow><mrow><mi>mD</mi></mrow></msub></math></span> can be approximated as <span><math><mrow><msub><mrow><mi>V</mi></mrow><mrow><mi>mD</mi></mrow></msub><mo>=</mo><mi>α</mi><msup><mrow><mi>I</mi></mrow><mrow><mo>−</mo><mi>β</mi></mrow></msup></mrow></math></span>, with adjustable parameters <span><math><mi>α</mi></math></span> and <span><math><mrow><mo>−</mo><mi>β</mi></mrow></math></span>, where <span><math><msup><mrow><mi>I</mi></mrow><mrow><mo>−</mo><mi>β</mi></mrow></msup></math></span> is a measure of <em><strong>R</strong></em> and <span><math><mi>α</mi></math></span> an approximation of <span><math><mrow><mi>S</mi><msub><mrow><mi>V</mi></mrow><mrow><mi>p</mi></mrow></msub></mrow></math></span>. A better understanding of the <span><math><mi>mD</mi></math></span> model will improve its future applications.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"705 ","pages":"Article 135665"},"PeriodicalIF":4.9,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593682","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}

{"title":"A novel zein/Auricularia cornea Ehrenb polysaccharides coated quercetin nanocarrier: Characterization, stability, antioxidant activity, and bioaccessibility","authors":"Wei Wang ,&nbsp;Yan Cui ,&nbsp;Xu Liu ,&nbsp;Mingzhu Zheng ,&nbsp;Yuhua Wang ,&nbsp;Jingsheng Liu ,&nbsp;Huimin Liu","doi":"10.1016/j.colsurfa.2024.135680","DOIUrl":"10.1016/j.colsurfa.2024.135680","url":null,"abstract":"<div><div>This study aimed to develop a novel and stable delivery system based on zein and <em>Auricularia cornea</em> Ehrenb polysaccharides (ACEP) for quercetin (Que). The pH-driven self-assembly combined with electrostatic deposition methods were employed to construct zein-ACEP nanoparticles (ZA NPs). The optimized nanocomposite was prepared at zein: ACEP mass ratios of 3:2, and it had superior ionic strength stability (0–75 mM NaCl), thermal stability (80°C for 30 min), average diameter of 185.6 nm, zeta-potential of −42.8 mV, and Que encapsulation efficiency of 75.8 %. The assembly of composites was facilitated primarily by hydrophobic, hydrogen-bonding, and electrostatic interactions. Que encapsulated with ZA NPs exhibited superior light stability, stronger antioxidant activity, and bioaccessibility than Que. Additionally, ZA NPs showed sustainable release capacity, and Que release from nanoparticles is consistent with an anomalous (non-Fickian) transport dominated by skeleton erosion. These findings demonstrate that ZA NPs have potential applications as an effective and viable delivery system for Que in functional food fields.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"705 ","pages":"Article 135680"},"PeriodicalIF":4.9,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142587041","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}

{"title":"Photoresponsive surfactants for controllable and reversible emulsion systems","authors":"Hongyan Xue ,&nbsp;Youmei Han ,&nbsp;Guanglei Liu ,&nbsp;Wenjing Chen ,&nbsp;Zhihang Wang ,&nbsp;Nong Wang","doi":"10.1016/j.colsurfa.2024.135669","DOIUrl":"10.1016/j.colsurfa.2024.135669","url":null,"abstract":"<div><div>Surfactants play a crucial role in applications such as oil-water separation, foam flotation, drug delivery, emulsion polymerization, and emulsifier recovery. Stimulus-responsive surfactants, as innovative smart materials, can reversibly control emulsion decomposition or phase transformation, facilitating emulsion circulation and component recovery. In this paper, two short-chain fluoroazobenzene photoresponsive surfactants (<strong>FADC-2</strong> and <strong>FADC-4</strong>) were synthesized. Three different reversible emulsion systems were constructed, leveraging the excellent chemical stability and rapid photoresponse of azobenzene and the trifluoromethyl group as a hydrophobic moiety. The results indicate that under different light exposures, the <strong>FADC-2</strong>/n-hexane/water and <strong>FADC-4</strong>/n-hexane/water emulsions exhibit reversible emulsification and demulsification cycles, while the <strong>FADC-4</strong>/n-octanol/water emulsions show reversible phase transfer. These findings highlight the effectiveness of photoresponsive surfactants in controlled emulsion systems, offering promising applications in fields requiring precise emulsion manipulation and liquid-liquid phase transfer, at the same time advancing the development of environmentally friendly, practical, durable, and stimulus-responsive surfactants.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"705 ","pages":"Article 135669"},"PeriodicalIF":4.9,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142573004","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}

{"title":"Cotton fabric coated with graphene oxide nanosheets and CuO nanoparticles as a “dip catalyst” for the photocatalytic degradation of dyes","authors":"Ali Majdoub ,&nbsp;Mohammed Majdoub ,&nbsp;Luiza Gaina ,&nbsp;Fouad Khalil ,&nbsp;Hicham Zaitan","doi":"10.1016/j.colsurfa.2024.135670","DOIUrl":"10.1016/j.colsurfa.2024.135670","url":null,"abstract":"<div><div>This research focuses on the immobilization in-situ of CuO nanoparticles on graphene oxide nanosheets modified cotton fabric (CuO/GO@CF) for the photodegradation, of organic dyes. The process involves coating the fabrics (CF) with graphene oxide (GO) nanosheets through sonication.</div><div>The produced CuO, GO@CF, and CuO/GO@CF have been characterized utilizing various physicochemical methods, such as X-ray diffraction (XRD), Fourrier Transformed Infra-Red (FTIR), trans mission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Thermogravimetric analysis (TGA).</div><div>The catalytic activity of the nanocomposite was assessed by methylene blue (MB) oxidation. Additionally, a detailed analysis was conducted to determine how various parameters, including catalyst surface, pH, MB concentration and CuO loading (%), affected the degradation efficiency. The results showed that the 10 %CuO/5 %GO@CF with a surface of 4 cm² (2 × 2 cm) exhibited the highest catalytic activity, achieving a MB removal efficiency of 82 % in 90 min. Additionally, after successive reaction cycles, the synthesized composite showed excellent stability and no appreciable drop-in catalytic activity. Moreover, it was shown that the primary reactive oxidative species (ROSs) in charge of the extremely effective MB breakdown were HO^{<strong>.</strong>}. Lastly, catalyst stability and recyclability showed that CuO/GO@CF might be used as a substitute photocatalyst for environmental cleanup and dye degradation. This synthetized composite can be easily added to and removed from the reaction solution while maintaining high catalytic performance in the removal of dyes and it could be beneficial in avoiding problems related to powder separation.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"705 ","pages":"Article 135670"},"PeriodicalIF":4.9,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578462","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}

{"title":"Mixed silicates with three-dimensional micro-architecture toward accelerate the antibacterial hemostatic effects in wound healing","authors":"Guangjian Tian ,&nbsp;Wenjun Wang ,&nbsp;Zhou Wang,&nbsp;Haidong Wang,&nbsp;Chuyu Zhu,&nbsp;Yi Zhang","doi":"10.1016/j.colsurfa.2024.135644","DOIUrl":"10.1016/j.colsurfa.2024.135644","url":null,"abstract":"<div><div>Silicates with the antibacterial hemostatic effects used in wound healing that could be served as antibiotic alternatives to traditional biomedicines. Mixed silicates containing two or more silicates with different morphologies exhibit an accelerated antibacterial hemostatic effects (e.g., the antibacterial rate toward kaolinite-montmorillonite against <em>E. coli</em> and <em>S. aureus</em> reached a maximum value of 59.14 ± 1.46 % and 91.83 ± 0.85 %, the blood clotting index and the hemostatic time toward kaolinite-montmorillonite reached a maximum value of 4.06 ± 1.56 % and 165.67 ± 6.13 s), that could be attributed to the individual silicate’s intrinsic antibacterial hemostatic effects arising from the silicate’s surface/edge charge and the constructed three-dimensional micro-architectural characteristics arising from the individual silicate’s loose stack state in mixed silicates. Besides, those ineffective antibacterial hemostatic effects were attributed to the unsuccessful three-dimensional micro-architectural construction originated from the silicate’s unreasonable mass ratio. The current findings illustrated that mixed silicates with an accelerated antibacterial hemostatic effects could be used in wound healing with taking into account biomedical functional module collocation and actual scenario orientation.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"705 ","pages":"Article 135644"},"PeriodicalIF":4.9,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142540027","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}

{"title":"Construction of a waste-derived graphite electrode integrated IL/Ni-MOF flowers/Co3O4 NDs for specific enrichment and signal amplification to detect aspartame","authors":"Manju Manuel,&nbsp;Suvardhan Kanchi","doi":"10.1016/j.colsurfa.2024.135648","DOIUrl":"10.1016/j.colsurfa.2024.135648","url":null,"abstract":"<div><div>A novel and cost-efficient electrochemical sensor was designed by immobilizing IL/Ni-MOF/Co₃O₄ nanodiamonds on the graphite (GE) electrode, marking the first application for the detection of aspartame. The graphite electrode was extracted and recycled from discharged batteries to serve as a working electrode. The nanocomposite features unique Co₃O₄ nanodiamonds, generated using <em>Coriandrum sativum</em> seed extract, alongside Ni-metal organic framework (MOF), which were synthesized through a solvothermal method. The conductivity and stability of the electrochemical sensor were enhanced through the incorporation of the ionic liquid (IL) ([BMIM][MeSO₄]. The phytochemical profile of <em>Coriandrum sativum</em> seed extract, analyzed by GC-MS, identified key compounds involved in the synthesis of Co₃O₄ nanodiamonds. A comprehensive characterization of the nanocomposite was performed using UV-Vis, FTIR, DLS, Zeta potential, XRD, XPS, FE-SEM, TEM, optical profilometry, and AFM to confirm the structural and elemental modifications. Electrochemical characterization of the bare and modified electrodes was conducted through cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The GE/IL/Ni-MOF/Co₃O₄ nanodiamonds modified electrode displayed enhanced electroanalytical performance for aspartame detection, characterized by signal amplification at +7.0 V. Quantitative analysis by Differential Pulse Voltammetry (DPV) and Square Wave Voltammetry (SWV) revealed a linear detection range of 3–15 µM for aspartame. A comparison of SWV and DPV revealed superior analytical performance for SWV, with limit of detection (LOD) and limit of quantification (LOQ) values of 1.02 µM and 3.1 µM (R² = 0.993) compared to 1.81 µM and 5.5 µM (R² = 0.986) for DPV. This study reveals the excellent adsorption capabilities of Ni-MOF and Co₃O₄ nanodiamonds (Co₃O₄ NDs), attributed to their high porosity and large surface area, paving the way for the development of affordable sensing devices for artificial sweeteners.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"705 ","pages":"Article 135648"},"PeriodicalIF":4.9,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142573036","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}

{"title":"Engineering defects and lattice disorientation in layered double hydroxides by coupling 2D-Co(OH)2 platelets via p-n heterojunction for enhanced photocatalytic degradation chloramphenicol","authors":"B. Janani ,&nbsp;V. Vinotha Sre ,&nbsp;Asad Syed ,&nbsp;Abdallah M. Elgorban ,&nbsp;Islem Abid ,&nbsp;Ling Shing Wong ,&nbsp;S. Sudheer Khan","doi":"10.1016/j.colsurfa.2024.135674","DOIUrl":"10.1016/j.colsurfa.2024.135674","url":null,"abstract":"<div><div>Defects and interface engineering play pivotal roles in optimizing the photocatalytic performance of heterojunctions. Among these, layered double hydroxides (LDH) stand out due to their two-dimensional lamellar structure and optical properties. This study focuses on creating a heterojunction between 2D-Co(OH)₂ platelets and defect-induced 2D-MgFe LDH by constructing interfacial electric field via p-n junction and enhanced the photocatalytic degradation of chloramphenicol. HR-TEM analysis shows abundant vacancies and lattice disorientation, affirming the effectiveness of defect engineering. The MgFe LDH–Co(OH)₂ nanocomposite (NCs) was synthesized through a straightforward co-precipitation and ultrasonic method. The band gap of 2.05 eV for MgFe LDH–Co(OH)₂ facilitated visible light absorption, leading to a remarkable 95.9 % degradation of chloramphenicol within 180 min under optimal conditions. The comparison studies conducted with layered double oxides (LDO) showed its lower efficacy than LDH. The stability of the NCs over five cycles and magnetic nature showcased their potential for large-scale wastewater treatment applications. Furthermore, both hydroxyl radicals (•OH) and superoxide radicals (O₂•⁻) were generated by the photocatalysis, as well as through the assistance of the Fenton reaction. The intermediates detected by GC-MS was tested for its toxicity using ECOSAR program which indicates its ideal for safe practical applications. This comprehensive study highlights the importance of defect engineering and heterojunction design in advancing photocatalytic materials for environmental remediation and paves a way for manufacturing innovation.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"705 ","pages":"Article 135674"},"PeriodicalIF":4.9,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578371","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}