Chemical Engineering Science最新文献

{"title":"Construction of frustrated Lewis pairs based on in-situ nitrogen-doped polymer-derived porous carbon for CO2 capture and conversion","authors":"Hongwu Ma ,&nbsp;Yurui Song ,&nbsp;Yajuan Zhou ,&nbsp;Hao Chen ,&nbsp;Keliang Wu ,&nbsp;Qiang Liu ,&nbsp;Yanlong Tai","doi":"10.1016/j.ces.2025.122694","DOIUrl":"10.1016/j.ces.2025.122694","url":null,"abstract":"<div><div>The capture and conversion of CO₂ into high-value fine chemicals represented one of the most promising approaches to addressing the issue of excessive carbon emissions. Frustrated Lewis pairs (FLPs) had attracted significant attention in CO₂ catalytic conversion due to their non-metallic nature and high reactivity. To address the industrial requirement for recyclable catalyst performance, the development of heterogeneous FLPs tailored for CO₂ conversion is of paramount importance. In this study, we first synthesized N-containing polymers using bipyridine and triphenylamine as structural units respectively, followed by a carbonization procedure to obtain in-situ N-doped porous carbon (designated as PC-BP and PC-TP, respectively). Subsequently, we introduced B(C₆F₅)₃ into PC-BP and PC-TP to construct FLPs between B and N (named PC-BP-FLPs and PC-TP-FLPs). The PC-BP-FLPs and PC-TP-FLPs exhibited excellent CO₂ capture performances, with the maximum CO₂ adsorption capacities of PC-BP-FLPs and PC-TP-FLPs reached 41 cm³/g and 60 cm³/g at 273.15 K and 1 bar, respectively. And then, PC-BP-FLPs and PC-TP-FLPs demonstrated excellent catalytic conversion performance (Yield &gt; 90 %) and recyclability (at least 5 cycles) in the process of catalyzing the synthesis benzimidazole from o-phenylenediamine and CO₂. These findings indicated that the catalysts held great application potential in the field of CO₂ capture and conversion, providing a sustainable solution for non-metallic catalytic conversion of CO₂.</div></div>","PeriodicalId":271,"journal":{"name":"Chemical Engineering Science","volume":"320 ","pages":"Article 122694"},"PeriodicalIF":4.3,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145141028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Elevated temperature effects on erosion damage in Q235 mild steel subjected to silicon particle impingement","authors":"Lite Zhang ,&nbsp;Xiangbo Meng ,&nbsp;Haozhe Jin ,&nbsp;Bing Yu ,&nbsp;Xiaofei Liu ,&nbsp;Chao Wang ,&nbsp;Genfu Xu ,&nbsp;Junfeng Zhou","doi":"10.1016/j.ces.2025.122670","DOIUrl":"10.1016/j.ces.2025.122670","url":null,"abstract":"<div><div>Understanding the erosion of industrial equipment caused by high-temperature silicon particles impingement is essential for ensuring pipeline integrity in silicone production. In this study, a high-temperature gas–solid erosion platform was developed to investigate the erosive behaviour of Q235 mild steel under varying particle velocities, particle sizes, impact angles, and temperatures (100–500 °C). The evolution of surface morphology was characterised by scanning electron microscopy (SEM), which revealed distinct temperature-dependent erosion mechanisms, including plastic deformation, micro-cutting, and crack propagation. Existing erosion models, however, do not account for silicon particle abrasives and neglect the influence of temperature on the erosion behaviour of the target material. The model in this study is based on the structure of the Oka model, with the incorporation of a temperature-dependent term and corresponding coefficient modifications. Experimental results show that the vertical erosion rate decreases with increasing particle size, while the velocity exponent exhibits a U-shaped dependence on temperature and the particle size exponent follows a single-peak trend. The temperature dependence of erosion is further described by a nonlinear softening function, and the maximum erosion rate occurs at an impact angle of 40°. Based on these findings, a predictive high-temperature erosion model was constructed using genetic algorithms, integrating both silicon particle properties and the softening behaviour of Q235 mild steel.</div></div>","PeriodicalId":271,"journal":{"name":"Chemical Engineering Science","volume":"320 ","pages":"Article 122670"},"PeriodicalIF":4.3,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145141029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"One-step fabrication of NiSO4/NiO solid acid catalyst for rapid CO2 desorption in CO2-loaded amine solutions","authors":"Zhan Tan ,&nbsp;Wenjin Ni ,&nbsp;Xiaowen Zhang ,&nbsp;Yushan Kai ,&nbsp;Jiayu Mao ,&nbsp;Yansong Yang ,&nbsp;Fangfang Zhao ,&nbsp;Kuiyi You ,&nbsp;He’an Luo","doi":"10.1016/j.ces.2025.122687","DOIUrl":"10.1016/j.ces.2025.122687","url":null,"abstract":"<div><div>CO₂ absorption by the organic amine solvent is currently the most promising method for CO₂ capture, while this process suffers from high solvent regeneration heat duty. The catalyst-assisted regeneration is an effective mean to reduce the energy consumption of amine solution regeneration. However, the catalysts reported so far still have shortcomings with insufficient performance, difficult preparation, and high cost. In this study, four solid acid catalysts, Fe₂(SO₄)₃/Fe₂O₃, NiSO₄/NiO, CuSO₄/CuO, Zr(SO₄)₂/ZrO₂ were prepared using a simple one-step synthesis method. These catalysts were then utilized to catalyze CO₂ desorption at 88 °C in a rich 5 M monoethanolamine (MEA) solution to lower the regeneration heat duty. All the prepared catalysts showed superior ability to promote CO₂ desorption, with the NiSO₄/NiO catalyst presenting the best activity. Notably, the NiSO₄/NiO catalyst enabled a 360 % enhancement in the maximum CO₂ desorption rate, a 118 % increase in the CO₂ desorption amount, and a 46 % reduction in the relative energy penalty. After 18 absorption–desorption tests, NiSO₄/NiO proved remarkable stability. The NiSO₄/NiO catalyst contains both B and L acids, and the addition of sulfate also enhances the acidity of the metal oxides, thereby accelerating the CO₂ desorption. A potential NiSO₄/NiO-catalyzed reaction mechanism is proposed based on FT-IR characterization and DFT calculations. This work provides a simple and inexpensive strategy to facilitate the rich amine solution regeneration process with low temperature and energy consumption.</div></div>","PeriodicalId":271,"journal":{"name":"Chemical Engineering Science","volume":"320 ","pages":"Article 122687"},"PeriodicalIF":4.3,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145140571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation of N/O co-doped biochar by microwave-assisted one-step method for adsorption removal of gaseous H2S","authors":"Yan Wang, Liqun Lian, Zihan Xiao, Yangxian Liu","doi":"10.1016/j.ces.2025.122688","DOIUrl":"https://doi.org/10.1016/j.ces.2025.122688","url":null,"abstract":"In this article, a simple and effective microwave-assisted one-step modification method was used to prepare nitrogen/oxygen co-doped straw biochar, and then the prepared adsorbent was used for efficient removal of gaseous hydrogen sulfide. The influences of preparation and process parameters on desulfurization performance of the adsorbents were assessed. The H₂S adsorption mechanism and kinetic laws, and the regeneration characteristics of the adsorbent were studied. Results showed that the microwave-assisted nitrogen/oxygen co-doping one-step modification technology significantly optimized the pore structure of the biochar, and achieved the synchronous loading of nitrogen-containing and oxygen-containing functional groups on the surface of biochar. The optimal preparation conditions were 10 % ammonia concentration and 20 min microwave radiation time. Increasing H₂S inlet concentration reduced the H₂S breakthrough time, while increasing water vapor content and raising adsorption temperature both significantly promoted the H₂S removal. The maximum adsorption capacity of the modified biochar for H₂S reached 62.61 mg/g. It was demonstrated that H₂S was converted into elemental sulfur, organic sulfur, bisulfate, and sulfate on the modified biochar surface through the co-action of nitrogen-containing and oxygen-containing functional groups. The desulfurization process over the modified biochar followed a pseudo-first-order kinetic model, and thus external mass transfer was the main controlling step for H₂S adsorption. The developed regeneration method can effectively restore the desulfurization ability of the saturated biochar.","PeriodicalId":271,"journal":{"name":"Chemical Engineering Science","volume":"88 1","pages":""},"PeriodicalIF":4.7,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145140573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Catalytic pyrolysis of n-paraffin coexisting with olefin over ZSM-5 based catalysts: Experiments, kinetics, and DFT calculations","authors":"Dongyang Liu,&nbsp;Yuen Bai,&nbsp;Dongdong Chen,&nbsp;Nan Zhang,&nbsp;Liang Zhao,&nbsp;Jinsen Gao,&nbsp;Chunming Xu","doi":"10.1016/j.ces.2025.122533","DOIUrl":"10.1016/j.ces.2025.122533","url":null,"abstract":"<div><div>This study investigates the co-cracking of n-hexane and 1-hexene, utilizing 1-hexene as an olefinic initiator to improve light olefin yields. Experimental investigations, kinetic analyses, and density functional theory calculations (DFT) were used to systematically explore cracking performance, interactions, and mechanisms for co-feeding. Comparied with single feeding of n-hexane, leading to higher light olefin yields (increased from 35.77 wt% to 58.61 wt%) when the olefin content is 20 wt%. Kinetic analysis revealed a shift from protolytic to hydrogen transfer cracking pathway when 1-hexene content exceeded 13.6 wt%, with the maximum cracking rate (13.12 h⁻¹) constant at 20 wt% olefin content. DFT calculations showed a lower energy barrier for hydrogen transfer cracking between n-hexane and 1-hexene, compared to n-hexane cracking alone. Therefore, a co-cracking mechanism was proposed, involving paraffin activation through carbocation intermediates generated by olefin, followed by β-cracking to generated light olefins and carbenium ion regeneration, establishing a framework for paraffin-olefin co-conversion.</div></div>","PeriodicalId":271,"journal":{"name":"Chemical Engineering Science","volume":"320 ","pages":"Article 122533"},"PeriodicalIF":4.3,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145140574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamically coupling computational fluid dynamics (CFD) and steady-state model (SSM) for simulating industrial coke drum and temperature prediction","authors":"Wei Han ,&nbsp;Yuanhe Yue ,&nbsp;Ying Jia ,&nbsp;Xianqiang Xiong ,&nbsp;Yong Zhang ,&nbsp;Yindong Liu ,&nbsp;Luhai Wang ,&nbsp;Yuting Cao ,&nbsp;Wei Ge","doi":"10.1016/j.ces.2025.122678","DOIUrl":"10.1016/j.ces.2025.122678","url":null,"abstract":"<div><div>The delayed coking process is crucial for heavy oil decarbonization and needle coke production. However, experimental measurements of the temperature, internal flow field and yields for products of the coke drum are challenging due to the extreme high operation temperature and pressure, thus the precise regulation is critically difficult. In this study, a ternary-phase computational fluid dynamics (CFD) model is proposed, which treats the gas, liquid, and solid phases (coke) as independent continuous medium and incorporates the models of fluid dynamics, heat transfer and chemical reaction. The model was used to characterize the heterogenous distribution of coke, gas velocity or temperature and analyze the influence of operating temperature, gas flow field on the product yields. However, it requires great amounts of computational time to simulate industrial delayed coking reactor for single working cycle (that is usually operated over 12 h). Therefore, a steady-state model (SSM) and CFD simulations were integrated to develop a multiscale computation strategy of CFD-SSM, where SSM can provide the initial condition of temperature and chemical component for CFD while the heterogeneous reaction rates of lumped-model was revised with CFD. A comparison between the CFD-SSM and industrial measurement of temperature profiles within 12 h operation was conducted to validate the efficiency and accuracy of the new model. The present research makes a great progress in simulating the industrial coke drum and provides key theoretical insights into the coke growth for temperature operation.</div></div>","PeriodicalId":271,"journal":{"name":"Chemical Engineering Science","volume":"320 ","pages":"Article 122678"},"PeriodicalIF":4.3,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145127704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multifunctional melamine-sponge composites with reflection capsules for radiation shielding in nuclear environments","authors":"Xue Liu ,&nbsp;Jianguo Deng ,&nbsp;Yingchun Lu ,&nbsp;Xin Li ,&nbsp;Fuhan Mai ,&nbsp;Lanxiang Ji ,&nbsp;Xiaofeng Bai","doi":"10.1016/j.ces.2025.122680","DOIUrl":"10.1016/j.ces.2025.122680","url":null,"abstract":"<div><div>This study focused on radiation shielding materials for nuclear applications, employing a vacuum-assisted impregnation method to optimise the microstructure and establish a synergistic shielding mechanism combining scattering and absorption. Specifically, melamine sponge (MS) is first modified using KH550 to form –NH₂ active sites on its pore surfaces. Subsequently, it is immersed in a composite solution to construct “reflective capsules”. Finally, gradient encapsulation is performed using polyborosiloxane and polyurethane. The results show that compared with pure MS, the tensile strength of this material doubles, the elongation increases by 179 %, and its shielding capabilities against 59.6 keV γ-rays and 0.025 keV thermal neutrons increase by 1442 % and 1593 % respectively, reaching 27.14 % and 43.35 %. Additionally, it has a photothermal peak temperature of 78.5 °C and stable thermal response. Furthermore, relying on the three-dimensional elastic network of the MS and the conductive pathway of MXene, the material achieves a piezoresistive coefficient of 5.27 kPa⁻¹, demonstrating potential for application as a pressure-sensitive sensor. Through microstructure design and functional integration, this work makes the material suitable for complex scenarios such as nuclear facility maintenance and emergency rescue.</div></div>","PeriodicalId":271,"journal":{"name":"Chemical Engineering Science","volume":"320 ","pages":"Article 122680"},"PeriodicalIF":4.3,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145134188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A rate-based model for reactive separation columns with sandwich packings","authors":"Patrick Franke, Markus Schubert, Uwe Hampel, Eugeny Y. Kenig","doi":"10.1016/j.ces.2025.122681","DOIUrl":"https://doi.org/10.1016/j.ces.2025.122681","url":null,"abstract":"Sandwich packings are assembled from two conventional structured packings with different geometrical surface areas stacked alternatingly within a separation column. When operated under partially flooded conditions, they provide significant mass transfer improvement compared to common structured packings. In this work, a rate-based model including novel mass transfer correlations is presented and validated using a comprehensive experimental database for the reactive absorption of CO₂ into aqueous monoethanolamine. The proposed rate-based approach is capable of accounting for axial dispersion, thereby enabling the evaluation of the effect of liquid-phase backmixing on the mass transfer performance. The validated rate-based model is used to evaluate the separation performance of sandwich packings. Compared with structured packings, up to 10 % higher mass transfer rates are obtained.","PeriodicalId":271,"journal":{"name":"Chemical Engineering Science","volume":"18 1","pages":""},"PeriodicalIF":4.7,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145134579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of the oscillatory Péclet number and periodic body acceleration on the unsteady Taylor dispersion in a non Newtonian fluid flow in a microvessel","authors":"Prem Babu Pal,&nbsp;P.V.S.N. Murthy","doi":"10.1016/j.ces.2025.122674","DOIUrl":"10.1016/j.ces.2025.122674","url":null,"abstract":"&lt;div&gt;&lt;div&gt;In this study, we investigate unsteady solute dispersion in the pulsatile flow of a non-Newtonian Herschel–Bulkley fluid through a circular tube under the influence of periodic body acceleration/deceleration. A new nondimensional time scaling, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;t&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;msup&gt;&lt;mi&gt;t&lt;/mi&gt;&lt;mo&gt;′&lt;/mo&gt;&lt;/msup&gt;&lt;mi&gt;ω&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; (&lt;span&gt;&lt;math&gt;&lt;mi&gt;ω&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; is the frequency of body acceleration) (Singh and Murthy, &lt;em&gt;J. Fluid Mech.&lt;/em&gt;, vol. 962, 2023, A42), is employed to capture unsteady effects more effectively, in contrast to the classical scaling &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;t&lt;/mi&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/msub&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;msub&gt;&lt;mi&gt;D&lt;/mi&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;/msub&gt;&lt;msup&gt;&lt;mi&gt;t&lt;/mi&gt;&lt;mo&gt;′&lt;/mo&gt;&lt;/msup&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;msup&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; (with &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mi&gt;D&lt;/mi&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; as molecular diffusivity and &lt;span&gt;&lt;math&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; as the tube radius) used in earlier works (Rana and Murthy, &lt;em&gt;J. Fluid Mech.&lt;/em&gt;, vol. 793, 2016, pp. 877–914). This new framework simplifies the governing equations by preserving the sinusoidal form of the oscillatory pressure gradient, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;p&lt;/mi&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;t&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;mi&gt;e&lt;/mi&gt;&lt;mi&gt;sin&lt;/mi&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;t&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, and connects with the classical scaling through the relation &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;t&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;msup&gt;&lt;mi&gt;α&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msup&gt;&lt;mo&gt;×&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;S&lt;/mi&gt;&lt;mi&gt;c&lt;/mi&gt;&lt;/mrow&gt;&lt;mo&gt;×&lt;/mo&gt;&lt;msub&gt;&lt;mi&gt;t&lt;/mi&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, where &lt;span&gt;&lt;math&gt;&lt;mi&gt;e&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; is the pressure pulsation gradient, &lt;span&gt;&lt;math&gt;&lt;mi&gt;α&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; is the Womersley frequency parameter, and &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;S&lt;/mi&gt;&lt;mi&gt;c&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; is the Schmidt number. Velocity profiles are obtained for all values of Womersley frequency parameters. Solute transport is analyzed using Aris’ method of moments, considering higher-order measures such as skewness and kurtosis that lead to non-Gaussian concentration profiles. Three solute dispersion regimes are investigated, which are governed by the Péclet number (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;P&lt;/mi&gt;&lt;mi&gt;e&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;), Womersley frequency parameters (&lt;span&gt;&lt;math&gt;&lt;mi&gt;α&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;), and the oscillatory Péclet number (&lt;span&gt;&lt;math&gt;&lt;msup&gt;&lt;mi&gt;P&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt;). The oscillatory Péclet number strongly affects the exchange coefficient &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;K&lt;/mi&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;t&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, and the effect of body acceleration (&lt;span&gt;&lt;math&gt;&lt;mi&gt;M&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;), wall absorption (&lt;span&gt;&lt;math&gt;&lt;mi&gt;β&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;), and other parameters on the convection, dispersion, skewness, and kurtosis coefficients (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;K&lt;/mi&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;t&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;–&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;K&lt;/mi&gt;&lt;mn&gt;4&lt;/mn&gt;&lt;/msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;","PeriodicalId":271,"journal":{"name":"Chemical Engineering Science","volume":"321 ","pages":"Article 122674"},"PeriodicalIF":4.3,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145134414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploring the removal of flame retardants and chlorobenzenes by plastic-based materials","authors":"Huiyi Zhang ,&nbsp;Sabolc Pap ,&nbsp;Mark A. Taggart ,&nbsp;Neil A. James ,&nbsp;Kenneth G. Boyd ,&nbsp;Stuart W. Gibb","doi":"10.1016/j.ces.2025.122675","DOIUrl":"10.1016/j.ces.2025.122675","url":null,"abstract":"<div><div>In recent decades, emerging contaminants like chlorobenzenes and flame retardants have raised global concern due to their environmental persistence. However, research into their removal from water remains in its infancy. In this study, pentachlorobenzene (PeCB) and 2,2′,4,4′-tetrabromodiphenyl ether (BDE 47) were selected as representative chlorobenzene and flame retardant compounds, respectively. Adsorption has proven to be a reliable technique for removing emerging contaminants from aquatic environments. For this research, raw and dopamine modified polypropylene ropes (using waste ropes collected from Scottish beaches) were utilized to adsorb PeCB and BDE 47 from water. The raw plastic exhibited a higher adsorption capacity for PeCB, with an adsorption capacity of up to 686 μg/g obtained based on the Langmuir model. However, the modified plastic demonstrated enhanced removal efficiency for BDE 47, with a maximum adsorption capacity of 627 μg/g with the Langmuir model. Both processes were endothermic and spontaneous, and well fitted to Langmuir and pseudo-second-order models. Characterisation analysis revealed PeCB adsorption relied on hydrophobic and π-π interactions, whereas BDE 47 adsorption potentially involved additional n-π interactions and hydrogen bonding. These findings advance understanding of contaminant-plastic interactions in both controlled and natural aquatic environments, offering a sustainable strategy for upcycling fishery waste (i.e., ropes and nets) into functional adsorbents.</div></div>","PeriodicalId":271,"journal":{"name":"Chemical Engineering Science","volume":"320 ","pages":"Article 122675"},"PeriodicalIF":4.3,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145127703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}