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

{"title":"Impact of polymer blending on ionic conductivity and dielectric polarization of TiO2 incorporated SPEEK/PVDF electrolytes","authors":"Mesut Yılmazoğlu ,&nbsp;Hikmet Okkay ,&nbsp;Ufuk Abaci","doi":"10.1016/j.colsurfa.2025.136394","DOIUrl":"10.1016/j.colsurfa.2025.136394","url":null,"abstract":"<div><div>In the present study, the effect of varying polyvinylidene fluoride (PVDF) content and blend ratios on the ionic conductivity and dielectric properties of titanium dioxide (TiO₂) incorporated blend membrane electrolytes has been investigated. Various characterizations were used to determine the structural, morphological and thermal characteristics of the prepared composite electrolytes. Proton conductivity, relaxation dynamics and dielectric measurements on polymer composites were performed by varying blend compositions with a constant weight ratio of TiO₂ filler. With respect to the pure sulfonated polyether ether ketone (SPEEK), blend ratios including 5 % and 10 % PVDF improved the ionic conductivity and dielectric response. Nevertheless, compositions with 15 % or more PVDF showed notable decreases in both characteristics. The SP10-TO electrolyte exhibited the highest conductivity, reaching 2.47 × 10⁻⁴ S/m at 1 MHz and 300 K. By hydrogen bonding, the ideal PVDF content enhanced ion transport and water retention in the SPEEK matrix. Ionic mobility was supported by TiO₂, which further improved water dispersion. However, too much PVDF stiffened the polymer structure, which reduced conductivity and limited water movement. SP10-TO showed the highest dielectric constant (ε') value of 6052.5 at 300 K and 20 Hz. ε' decreased with increasing temperature and frequency due to reduced dipole alignment. Loss tangent (tanδ), a measure of relaxation dynamics, showed that the ideal blend composition had the shortest relaxation time, as 4.91 × 10⁻⁵ s. Increased ionic conductivity was strongly correlated with this drop, which suggests rapid dipole relaxation. The results highlight PVDF role in optimizing SP-TO polymer electrolytes for energy storage and conversion.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136394"},"PeriodicalIF":4.9,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394703","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":"Crystallographic texture role on the electrochemical property improvement contributed by grain refinement for AA2024 aluminum alloy subjected to cross accumulative roll bonding","authors":"Majid Naseri ,&nbsp;Omid Imantalab ,&nbsp;Davood Gholami ,&nbsp;Mohammad Alvand ,&nbsp;Yong-Cheng Lin ,&nbsp;Ehsan Borhani ,&nbsp;Abdel-Hamid I. Mourad","doi":"10.1016/j.colsurfa.2025.136391","DOIUrl":"10.1016/j.colsurfa.2025.136391","url":null,"abstract":"<div><div>Herein, the synergistic influences of grain refinement and crystallographic texture development on the electrochemical behavior of the nanostructured AA2024 aluminum alloy were systematically investigated in a phosphate buffer solution (pH = 8.3). For this purpose, AA2024 alloy sheets were severely deformed at room temperature through cross accumulative roll bonding (CARB), i.e., each cycle was followed by a 90° rotation around the normal direction (ND) axis. The microstructure of the CARB-processed alloy after the eighth cycle showed a uniform structure with ultrafine grains with sizes of 150–100 nm. The dominant texture components became more intense at their initial cycles, but as the number of CARB cycles increased, the components became stable. Texture components such as S {123}&lt; 634 &gt; , Brass {011}&lt; 211 &gt; , Goss {011}&lt; 100 &gt; , Rotated Cube {001}&lt; 110 &gt; , and P {110}&lt; 221 &gt; were predominant after eight cycles. Moreover, it was revealed that the decreasing grain size and uniform distribution of extremely fine grains and high-intensity {011} orientation textures, such as Brass {011}&lt; 211 &gt; , Goss {011}&lt; 100 &gt; , and P {110}&lt; 221 &gt; texture components, had a positive role in the electrochemical responses of the AA2024 alloy with the increase of CARB cycles. Finally, these findings suggest that cross accumulative roll bonding processing can effectively condition a thick and less defective passive layer with superior protection properties.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136391"},"PeriodicalIF":4.9,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394956","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":"Broad bean stalk extract as a novel eco-friendly corrosion inhibitor for cold rolled steel in HCl medium: Experimental and theoretical investigation","authors":"Ran Lei ,&nbsp;Shuduan Deng ,&nbsp;Yujie Qiang ,&nbsp;Juan Xu ,&nbsp;Xianghong Li","doi":"10.1016/j.colsurfa.2025.136347","DOIUrl":"10.1016/j.colsurfa.2025.136347","url":null,"abstract":"<div><div>The ultrasonic extraction technique was used in this work to prepare the agricultural waste of broad bean (<em>Vicia faba</em>) stalks extract (VFSE). By employing a range of experimental techniques and theoretical computations, the corrosion inhibition performance of VFSE on cold rolled steel (CRS) in 1.0 M HCl medium was examined. The results revealed that the maximum inhibition efficiency was 90.3 % at a VFSE dosage of 100 mg L⁻¹, and showed well inhibition stability at different temperatures within 48 h. VFSE also displayed mixed-type inhibitory characteristics and the polarization resistance increased by 8 times after adding VFSE. Increasing the concentration of VFSE resulted in higher charge transfer resistances (797.7 Ω cm²) in electrochemical impedance spectroscopy (EIS) measurements. Moreover, surface characterization confirmed the adsorption of VFSE on the CRS surface as a film. Time-of-flight secondary ion mass spectrometry technique provided stronger evidence for the adsorption of VFSE on the CRS surface. It was confirmed by liquid chromatograph-mass spectrometer and theoretical calculations that flavonoids, alkaloids and esters could be effectively adsorbed on the CRS surface, and the benzene rings, O/N heterocycles and -OH functional group contained in these components were the active sites. These active sites demonstrated strong chemisorption interactions with the CRS substrate, thereby corroborating the effective corrosion inhibition performance of VFSE from a theoretical perspective.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136347"},"PeriodicalIF":4.9,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388451","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":"Inhibitive property and mechanism of polyvinyl alcohol/tannic acid materials on clay hydration and swelling","authors":"He Tao ,&nbsp;Deng Zhengqiang ,&nbsp;Li Xinliang ,&nbsp;Luo Yufeng ,&nbsp;Chen Lili ,&nbsp;Ran Qihua ,&nbsp;Ou Meng ,&nbsp;Zhang Hehai ,&nbsp;Tao Jiajun","doi":"10.1016/j.colsurfa.2025.136383","DOIUrl":"10.1016/j.colsurfa.2025.136383","url":null,"abstract":"<div><div>Shale composed of a large amount of clay minerals is easy to swell and disperse in water, leading to wellbore instability. In recent years, adhesive shale stabilization materials have become a research hotspot because of their good bonding effect. However, many existing materials have problems such as high cost and incompatibility. In this study, polyvinyl alcohol (PVA) and tannic acid (TA) have been used as raw materials to prepare a bonding-type shale stabilizer (abbreviated as PT) for water-based drilling fluids. The shale compressive strength tests, immersion tests, linear swelling tests, and shale hot-rolling recovery tests have been used to evaluate its inhibitive performance. The results showed that the shale recovery of 3 % PT solution with a PVA/TA mass ratio of 2:1 can reach more than 90.0 %, even after hot-rolled at 150°C. In addition, the bentonite soaked in PT aqueous solution had good integrity and small volume expansion at 90°C. After immersing for 5 h, the swelling height of the bentonite sample is only 2.0 mm. Meanwhile, the compressive strength of the artificial core after soaking in 3 % PT aqueous solution at 90°C for 24 h was the highest, reaching 30.19 MPa. The rheological and filtration performance evaluation showed that PT could improve the viscosity and reduce the fluid loss of bentonite dispersion, displaying good compatibility. According to microstructure analysis, it was preferred that PVA polymer with a large number of hydroxyl groups and TA small molecules containing catechol structures in PT could form a network structure through multiple hydrogen bonding interactions, showing a strong adhesive effect. Then, PT easily adsorbed on the surface of shale or clay particles, formed a dense adsorption film on the surface to block the invasion of water molecules, and even enhanced the cementation between these particles. Finally, hydration, swelling, and dispersion of clay minerals were well inhibited, and the borewell stability was enhanced.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136383"},"PeriodicalIF":4.9,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403215","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":"Achieving exceptional wear resistance in severely deformed cost-effective AlCrFeNi high-entropy alloys through cyclic closed-die forging technique","authors":"Majid Naseri ,&nbsp;Davood Gholami ,&nbsp;Dmitry Mikhailov ,&nbsp;Alena Myasnikova ,&nbsp;Omid Imantalab ,&nbsp;Nataliya Shaburova ,&nbsp;Aleksandr Orlov ,&nbsp;Yong-Cheng Lin ,&nbsp;Abdel-Hamid I. Mourad ,&nbsp;Evgeny Trofimov","doi":"10.1016/j.colsurfa.2025.136397","DOIUrl":"10.1016/j.colsurfa.2025.136397","url":null,"abstract":"<div><div>Herein, the correlation between microstructural refinement and mechanical properties, particularly wear performance, of cost-effective AlCrFeNi_3.1 and AlCrFe₂Ni_2.1 high-entropy alloys (HEAs) processed through cyclic closed-die forging (CCDF) technique was investigated. It was found that both alloys, before and after the CCDF process, exhibited a dual-phase structure consisting of NiAl-rich and CrFeNi-rich phases. Significant grain refinement, the formation of broken CrFeNi-rich dendrite fragments, and their efficient distribution within the matrix were demonstrated by implementing the CCDF technique. However, the microstructure of the AlCrFe₂Ni_2.1 alloy turned out to be finer than that of the AlCrFeNi_3.1 alloy. The CCDF-processed AlCrFe₂Ni_2.1 alloy exhibited the highest microhardness (∼ 719 HV) and the lowest wear rate (∼ (1.3 ± 0.1) × 10^–5 mm³.N⁻¹.m⁻¹), whereas those for the AlCrFeNi_3.1 alloy were 428 HV and (1.8 ± 0.1) × 10^–5 mm³.N⁻¹.m⁻¹, respectively. Finally, the resistance against plastic deformation through reducing the depth of grooves, the degree of delamination, and adhesive wear in the CCDF-processed alloys was clearly revealed compared to the as-homogenized state, specifically for the AlCrFe₂Ni_2.1 alloy. The findings of this study support the suggestion that combining the design of HEAs from inexpensive alloying elements with CCDF processing has the potential to develop economically viable materials without compromising performance.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136397"},"PeriodicalIF":4.9,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388504","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":"Easily modified polyamine resin: Its synthesis and adsorption performance for perrhenate ion in acidic sulfate media","authors":"Yu Wang ,&nbsp;Chengqiang Hu ,&nbsp;Junlian Wang ,&nbsp;Guoyong Huang ,&nbsp;Fengshan Yu ,&nbsp;Lingling Xiao","doi":"10.1016/j.colsurfa.2025.136392","DOIUrl":"10.1016/j.colsurfa.2025.136392","url":null,"abstract":"<div><div>Developing novel extractive resins for Re^7 + (in ReO₄^- form) enrichment and separation that have prospect of practical applications has drawn great attention in recent years. In this study, a kind of highly efficient polyamine-modified resin (marked as Merrifield resins-TEPA-Et) was synthesized by simply modified Merrifield resins with TEPA and bromoethane. This resin was characterized by FT-IR, SEM, EA, XPS and BET. Its adsorption behaviors for Re⁷⁺ at different oscillating time, initial Re⁷⁺ concentration and acidity were investigated. Its selectivity and saturation capacity for Re⁷⁺ were evaluated. The Re⁷⁺ adsorption kinetics, isotherm, thermodynamics and mechanism were studied. The desorption behavior of the adsorbed Re⁷⁺ was also explored. Merrifield resins-TEPA-Et has as high adsorption saturation capacity as 422.47 mg/g, and excellent selectivity for Re⁷⁺ with separation factors β_Re/Mo, β_Re/Cu, β_Re/Ni and β_Re/Mn reaching to 7, 48, 74 and 102, respectively, and hardly adsorbs the coexisting metal ions Co²⁺, Zn²⁺, Al³⁺ and Fe³⁺ at acidity of 0.05 mol/L H₂SO₄. The Re⁷⁺ adsorption Merrifield resins-TEPA-Et fit pseudo-first order kinetic model and Freundlich adsorption isotherm model, and is endothermic. The adsorbed Re⁷⁺ can be easily and completely desorbed by 0.3 mol/L NH₄SCN solution. The adsorption process includes protonation of the amine groups and then interaction with ReO₄^- via electrostatic attraction.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136392"},"PeriodicalIF":4.9,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394912","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":"Cellulose nanofibril aerogels derived from Pickering emulsion templates with anisotropic droplet sizes","authors":"Shuaib A. Mubarak,&nbsp;Yunsang Kim,&nbsp;Islam Elsayed,&nbsp;El Barbary Hassan","doi":"10.1016/j.colsurfa.2025.136393","DOIUrl":"10.1016/j.colsurfa.2025.136393","url":null,"abstract":"<div><div>Nanocellulose-based aerogels are considered as an ideal green absorbent because of their excellent absorptive performance as well as the renewability, biodegradability, and abundance of the raw material. Emulsion templating allows for the control of the overall porosity and morphology of the resultant aerogel, which may enhance the absorptive performance of the aerogel. This study explored the effect of anisotropic droplet sizes in an emulsion template on the microstructure and oil absorption performance of cellulose nanofibril (CNF) aerogels. By employing a two-step emulsification method—initial hand shaking followed by ultrasonication—two distinct droplet sizes, <em>i.e.</em>, &gt; 50 µm and &lt; 20 µm, of <em>n</em>-hexane-CNF oil-in-water (O/W) Pickering emulsions were produced at CNF concentrations of 0.1 – 0.5 %. These O/W emulsions were subsequently freeze-dried to produce emulsion-templated CNF aerogels. The resultant CNF aerogels exhibited densities ranging from 2.3 to 6.0 mg/cm³ that were lower than the theoretical density of cellulose aerogels, possibly due to the presence of the large droplets (&gt;50 µm) in the emulsion template. The density of the aerogels approached to the theoretical value at the CNF concentration of 0.5 %, which can be attributed to the higher prevalence of the small droplets (&lt;20 µm) in the emulsion template at increased CNF concentrations. Scanning electron microscopy and the Brunauer-Emmett-Teller analysis indicated that the resulting CNF aerogels retained the pore size and distribution of the emulsion template, with a reduced specific surface area compared to the emulsion-templated CNF aerogels with isotropic droplet size. The CNF aerogels exhibited the highest absorption capacities of 226 g/g and 169 g/g for chloroform and <em>n</em>-hexadecane, respectively. These findings demonstrate that controlling droplet sizes in emulsion templating can significantly influence the microstructure of resulting CNF aerogels, highlighting their potential as highly effective and sustainable oil absorbents.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136393"},"PeriodicalIF":4.9,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403212","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":"CO2 adsorption behavior and mechanism of bifunctionalized amine-based protic ionic liquid/KIT-6 composites","authors":"Shuting Zhang ,&nbsp;Jianwen Wei ,&nbsp;Linlin Geng ,&nbsp;Lin Ge ,&nbsp;Lei Liao","doi":"10.1016/j.colsurfa.2025.136389","DOIUrl":"10.1016/j.colsurfa.2025.136389","url":null,"abstract":"<div><div>Novel bifunctionalized amine-based protic ionic liquid/KIT-6 composite adsorbents for carbon dioxide (CO₂) adsorption have been prepared by impregnating amine-based protic ionic liquids of different types (tetraethylenepentamine nitrate, [TEPA][NO₃], or tetraethylenepentamine lysinate, [TEPA][Lys]) and concentrations (20, 30, 40, and 50 wt%) onto N-[3-(trimethoxysilyl)propyl]ethylenediamine-grafted KIT-6. These innovative hybrid adsorbents exhibited remarkable CO₂ adsorption performance and thermal stability. In particular, the adsorbent with 40 wt% [TEPA][Lys] loading exhibited the highest adsorption capacity at 90 ℃ (3.670 mmol·g⁻¹), which was almost 5 times higher than that of the original carrier KIT-6 (0.850 mmol·g⁻¹). This excellent adsorption performance can be ascribed to the synergistic effect of strong affinity between the amine groups and CO₂ and high porosity of the support. After five adsorption/desorption cycles, the CO₂ adsorption by the adsorbents demonstrated significant regeneration, and the saturated adsorption capacities of 2N-K6-P30 and 2N-K6-L40 were only 8.98 % and 7.77 % lower than those of the original ones, respectively. In addition, the infrared results revealed that CO₂ adsorption is a synergistic process of physical and chemical adsorption, in which chemisorption is dominated, and the CO₂ adsorption mechanism is consistent with the zwitterion mechanism. In conclusion, the bifunctionalized amine-based protic ionic liquid/KIT-6 adsorbents can be suggested as potential/recyclable materials for efficient removal of CO₂ from industrial flue gases after desulfurization.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136389"},"PeriodicalIF":4.9,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403213","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":"Multicomponent shape-memory microfibers electrospun with precisely tunable thermal triggers","authors":"Mohammad Shamsi ,&nbsp;Bret Tantorno ,&nbsp;Michael D. Dickey ,&nbsp;Richard J. Spontak","doi":"10.1016/j.colsurfa.2025.136382","DOIUrl":"10.1016/j.colsurfa.2025.136382","url":null,"abstract":"<div><div>Shape-memory polymers (SMPs) are of tremendous fundamental and practical interest as stimuli-responsive soft materials since they can spontaneously transform from one strain state to another upon environmental stimulation. Most SMPs are dense films possessing a single thermal trigger that responds to a change in temperature. In this work, we examine novel shape-memory nonwovens (SMNs) comprised of electrospun microfibers randomly arranged into mats and possessing a trigger that can be precisely varied. These SMNs derive from physically-crosslinked triblock copolymers blended with one or more midblock-selective crystallizable hydrocarbons (HCs) with 18–40 carbon units (HC18-HC40). The dependence of the trigger (melting) temperature on blend composition is ascertained by calorimetry for systems composed of a single copolymer and one or more hydrocarbons. Judicious selection of the blends produced here yields designer materials that can be triggered near/at body temperature. Examples of blends satisfying this requirement include a styrenic thermoplastic elastomer (TPE) modified with ∼40–95 wt% HC20 or 80–95 wt% HC18/HC20 (equimass). While the trigger temperature of the latter ternary blend is independent of TPE molecular weight, SMNs composed of a high-molecular-weight TPE possess remarkable mechanical properties, such as elongations exceeding 3000 % strain. We envisage use of these SMNs in applications such as self-fitting personal protection equipment.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136382"},"PeriodicalIF":4.9,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388501","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":"Adsorption of ciprofloxacin on iron oxides in the absence or presence of polyethylene microplastic","authors":"Deise Paludo ,&nbsp;Eloana Janice Bonfleur ,&nbsp;Vander Freitas Melo ,&nbsp;Gean Delise Leal Pasquali ,&nbsp;Suzana Fatima Bazoti ,&nbsp;Rodrigo Studart Corrêa","doi":"10.1016/j.colsurfa.2025.136378","DOIUrl":"10.1016/j.colsurfa.2025.136378","url":null,"abstract":"<div><div>Antibiotics and microplastics are considered emergent pollutants, with soils serving as critical terminal repository. As such, study aimed to evaluate the outer- and inner-sphere adsorptions of ciprofloxacin on synthetic ferrihydrite, goethite and hematite under three pH conditions (4.7, 6.2, 9.0), both in absent and presence of polyethylene microplastic (40–48 µm, 5 % w/w) (novelty by simulating double environmental contamination with ciprofloxacin and microplastic). Another novelty was estimating the adsorption stability of ciprofloxacin using chemical sequential extractions: i) outer-sphere (0.01 mol L⁻¹ NaOH, pH 12); (ii) low energy inner-sphere (0.1 mol L⁻¹ KH₂PO₄, pH 4.5); iii) high energy inner-sphere - residual ciprofloxacin. Total ciprofloxacin adsorption capacity (mg g⁻¹) followed decreasing order: ferrihydrite (18.1–20.8) &gt; hematite (5.7–13.8) &gt; goethite (3.5–12.7). When considering adsorption relative to the specific surface area (mg m⁻²), order shifted to hematite (0.46) &gt; goethite (0.30) &gt; ferrihydrite (0.07) at pH 6.2, where highest adsorption rates were observed. Outer-sphere adsorption, as percentage of total adsorption, was most significant under alkaline conditions (pH 9.0): ferrihydrite (29–55 %) &gt; hematite (8–46 %) &gt; goethite (2–24 %). Conversely, residual adsorption was predominant at pH 4.7 for crystalline iron oxides (hematite, goethite). Maximum ciprofloxacin adsorption capacity on pure microplastic was 7.6 mg g⁻¹, pH 4.7. The inclusion of two crystalline Fe oxides allowed to evaluate the positive effect on ciprofloxacin adsorption of greater exposure of more reactive ferrol groups. Addition of 5 % microplastic to iron oxides did not affect ciprofloxacin adsorption on ferrihydrite, goethite, and hematite. From environmental perspective, Fe oxides, abundant in humid tropical soils, have demonstrated high capacity for ciprofloxacin filtration (characterized by high adsorption energy), even in environments subject to dual contamination with microplastic.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136378"},"PeriodicalIF":4.9,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388448","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}