{"title":"Rapid and effective absorption of dye molecules from their low-concentrated water solutions by organically cross-linked polyacrylamide-hexagonal boron nitride nanocomposite and polyacrylamide hydrogels","authors":"Mohan Raj Krishnan, Edreese H Alsharaeh","doi":"10.1016/j.colsuc.2025.100055","DOIUrl":"10.1016/j.colsuc.2025.100055","url":null,"abstract":"<div><div>Dye-laden wastewater from textile industries significantly impacts the environment and, eventually, human health. It is, therefore, necessary to treat wastewater effluent from textile industries before it is discharged into water sources. Herein, we report the potential of organically cross-linked polyacrylamide-based nanocomposite hydrogels to rapidly and effectively absorb different dye molecules (methylene blue (MB), phenol red (PR), and methyl orange (MO)) from their respective low-concentrated water solutions. The polyacrylamide-hexagonal boron nitride nanocomposite hydrogel (PAM/hBN) was prepared by reacting PAM molecules with organic cross-linkers such as N, N’ methylene bisacrylamide (MBS) in the presence of hBN at high temperatures (150 °C; 8 h.). The FT-IR results revealed the successful formation of the PAM/hBN nanocomposite hydrogels. The differential scanning calorimetric (DSC) results also complement the nanocomposite formation as the melting temperature of PAM/hBN nanocomposite is comparatively higher than that of the neat-PAM hydrogel. The SEM showed that the PAM/hBN nanocomposite has macroporous morphology (average pore size of 2 μm) while neat-PAM hydrogel exhibited dense structures. The equilibrium absorption of PAM/hBN nanocomposite hydrogels is as high as 13.5 mg/g, while the equilibrium is reached within 10 min. The porous morphology of the nanocomposite hydrogels promotes the mass transfer process and leads to the rapid absorption of dye molecules from low-concentrated water solutions.</div></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"3 ","pages":"Article 100055"},"PeriodicalIF":0.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Taguchi optimized electrocoagulation technology: A sustainable approach to oil-water separation in large scale applications","authors":"Hansa Muvel , Manoj Kumar Jindal , Pradip Kumar Tewari , Semyon Mareev , Vikky Anand","doi":"10.1016/j.colsuc.2025.100065","DOIUrl":"10.1016/j.colsuc.2025.100065","url":null,"abstract":"<div><div>Electrocoagulation (EC) method used for eliminating oil from oily wastewater, though it encounters challenges such as high operational costs and electrode passivation. The novelty of this research is its development of a cost-effective and highly efficient EC process, specifically optimized for sunflower oil wastewater. The effectiveness of EC in reducing turbidity was evaluated through experimental analysis. The Taguchi methodology was employed to optimize critical process parameters: pH, operating voltage, EC duration, electrode spacing, and sodium chloride concentration. The Optimal conditions identified were pH 6, 30 V, 80 minutes of EC duration, 5 cm electrode spacing, and 0.2 g/L NaCl, achieving an impressive oil removal rate of 94.46 %, along with high energy efficiency. Characterization of the electrodes using UV spectroscopy, SEM, and EDX under these optimal conditions further supported the findings. The study also examined the operating cost (OC) associated with the EC process using aluminium electrodes. Energy consumption ranged from 0.96 kWh/m³ to 22.61 kWh/m³ , while aluminium electrode consumption varied between 0.06 kgAl/m³ and 0.275 kgAl/m³ . The OC fluctuated from 0.252 to 4.654 USD per 1000 litres of oil wastewater treatment across nine orthogonal array experiments. This research contributes to advancing sustainable EC technology for separating emulsified oil-water mixtures, aligning with circular economy principles for responsible industrial wastewater management.</div></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"3 ","pages":"Article 100065"},"PeriodicalIF":0.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Microorganism research advances from a novel bibliometric method","authors":"Shan Chen , Yuanzhao Ding","doi":"10.1016/j.colsuc.2025.100068","DOIUrl":"10.1016/j.colsuc.2025.100068","url":null,"abstract":"<div><div>Microorganisms have a significant impact on human life, with harmful microorganisms causing diseases such as lung infections and urinary tract infections, while beneficial ones are used for applications like pollutant removal and microbial fuel cell energy generation. A deep understanding of microorganisms is essential for advancing scientific knowledge. Recent research on microorganisms is crucial, and traditional methods such as VOSviewer have been commonly used for bibliometric analysis. In this study, a novel approach is applied to analyze 38,470 articles, providing far more comprehensive information than VOSviewer. The results successfully visualize and identify the latest research findings on microorganisms, while also highlighting the promising future direction of integrating big data and machine learning into microbiology. This innovative approach offers significant potential to accelerate progress in the field, enabling more efficient and accurate microbial research applications.</div></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"3 ","pages":"Article 100068"},"PeriodicalIF":0.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yihong Liu , Katie Buchel , Ruoxin Deng , Lijia Liu
{"title":"Magnesium germanium oxide hydrate nanowires with outstanding surface stability for selective cationic dye removal","authors":"Yihong Liu , Katie Buchel , Ruoxin Deng , Lijia Liu","doi":"10.1016/j.colsuc.2025.100076","DOIUrl":"10.1016/j.colsuc.2025.100076","url":null,"abstract":"<div><div>Physical adsorption is one of the most promising methods for organic dye removal in wastewater. However, existing adsorbent materials lack a combination of selectivity, efficiency, stable performance over a wide pH range, and reusability after repeated regeneration. In this work, we presented a novel adsorbent, magnesium germanium oxide hydrate (MGOH) nanowires. Utilizing electrochemical and acid-base titration methods, we found that MGOH possesses a unique crystal structure that is rich in hydroxyl (-OH) groups. These -OH groups keep the surface of MGOH negatively charged over a wide pH range from 0 to 10.6, which hasn’t been achieved by any adsorbent to date. Using rhodamine B (RhB) as a model cationic dye, we demonstrated that a 97.4 % removal efficiency can be achieved within 15 min in contact with MGOH at room temperature. The adsorption selectivity of MGOH toward cationic dyes was further demonstrated by effective removal of target dyes in dye mixtures. In addition, MGOH can be easily regenerated through solvent washing and thermal annealing for multiple cycles without losing its adsorption capability.</div></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"3 ","pages":"Article 100076"},"PeriodicalIF":0.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144654910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Quantifying particle size effects on CO2 evolution at solid–liquid interfaces of calcium carbonate in acidic media","authors":"Yuki Z. Maeda , Hongyan Wu , Jing Liu","doi":"10.1016/j.colsuc.2025.100081","DOIUrl":"10.1016/j.colsuc.2025.100081","url":null,"abstract":"<div><div>Environmental interfacial processes, from acid rain to acidic wastewaters, drive dissolution of carbonate-rich solids and CO<sub>2</sub> release. In this study, we investigate particle size effects on CO<sub>2</sub> emission kinetics in reaction between eggshell, a model porous bioceramic, with acetic acid (CH<sub>3</sub>COOH). Five particle size fractions of eggshells, including dimensions above and below the natural shell thickness, were tested. Time-resolved CH<sub>3</sub>COOH concentration measurements revealed that there are two regimes in dependence of CO<sub>2</sub> emission rates on the particle sizes. Simply breaking the shells does not lead to a clear enhancement in the reaction rate. However, finer particles, particularly those approaching or smaller than the shell thickness, exhibited markedly higher initial rates due to exposure of internal pore networks upon fracture. For all particle sizes, the reaction rates decrease with acid depletion and reduced reactive surface availability with time. No noticeable difference was observed by the presence of CO<sub>2</sub> bubbles on the reaction kinetics. These results highlight the role of particle size, morphology, and internal porosity in governing acid–carbonate interfacial reaction kinetics, with implications for porous carbonate dissolution in natural and engineered systems.</div></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"3 ","pages":"Article 100081"},"PeriodicalIF":0.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145265086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Evaluating fundamental surface properties for selective separation of synthetic and natural fiber fragments","authors":"Aparna J. Lobo , Chinmayee V. Subban","doi":"10.1016/j.colsuc.2025.100084","DOIUrl":"10.1016/j.colsuc.2025.100084","url":null,"abstract":"<div><div>Microplastic pollution is a growing environmental and human health hazard. Entering the environment via municipal wastewater, a bulk of the microplastics found are synthetic textile fiber fragments (FFs) generated from washing of synthetic fabrics. Separating the synthetic from natural FFs at laundry effluents could prevent eventual pollution of rivers and oceans. In this study we characterize representative synthetic and natural FFs to identify key properties that distinguish the FF material types towards achieving selective separation. Our data show polyester FFs and cotton FFs differ in their hydrophobicity, which can be leveraged for targeted separation. Based on differences in hydrophobicity and associated thermodynamic driving forces, selective removal of polyester FFs from a mixture of polyester and cotton FFs is demonstrated. In a batch process utilizing flotation, bubbles are used to selectively separate synthetic polyester FFs from natural cotton FFs in mixed-fiber solutions containing salt (NaCl). Using principal component analysis (PCA) of Fourier Transform Infrared (FTIR) spectroscopy data, the FF compositional make up is quantified for analysis of separation efficiency and recovery of synthetic FFs. The synthetic FF recovery and separation efficiency is then evaluated as a function of time, FF concentration, and FF composition. All experimental conditions evaluated in the study showed selective recovery of polyester over cotton FFs, and for the configurations tested, batch times longer than 15 min had minimal efficiency gains. This study demonstrates separation of two representative FFs dispersed in salt solution as a first step toward microplastics remediation.</div></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"3 ","pages":"Article 100084"},"PeriodicalIF":0.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145464856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Erica Pensini , Caitlyn Hsiung , Alejandro G. Marangoni , Joshua van der Zalm , Aicheng Chen , Nour Kashlan
{"title":"Sulfolane reduction by arginine and ferrous iron ions","authors":"Erica Pensini , Caitlyn Hsiung , Alejandro G. Marangoni , Joshua van der Zalm , Aicheng Chen , Nour Kashlan","doi":"10.1016/j.colsuc.2025.100061","DOIUrl":"10.1016/j.colsuc.2025.100061","url":null,"abstract":"<div><div>Sulfolane is a water-miscible, bioavailable, worldwide pollutant. While its aerobic biodegradation by bacteria is well documented, its abiotic degradation by amino acids and metal ions has never been reported. Here we find that Fe<sup>2 +</sup> and arginine (ARG) reduce sulfolane to sulfoxide at circum-neutral pH, as shown by attenuated total reflection-Fourier transform infrared spectroscopy. Sulfolane reduction occurs at the surface of iron-ARG solid flocs, onto which sulfoxide remains sorbed even after rinsing with water volumes up to 16-fold the floc volume. Sulfolane reduction by Fe<sup>2+</sup> ions does not occur in the absence of ARG, which binds iron and affects its redox chemistry, as shown by cyclic voltammetry. Sulfolane reduction is also promoted by lysine, but not by histidine. Sulfolane is not reduced by Fe<sup>3+</sup> and ARG, indicating that this reaction requires Fe<sup>2+</sup> oxidation to Fe<sup>3+</sup>. The observed abiotic transformation of sulfolane may affect its fate in natural ecosystems.</div></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"3 ","pages":"Article 100061"},"PeriodicalIF":0.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143229509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wei Shu , Haowen Lin , Xintong Chen , Yi Yang , Zhicong Chen , Minyi Liu , Xintong You , Ying Li
{"title":"Solid transformation synthesis of zeolites and their applications","authors":"Wei Shu , Haowen Lin , Xintong Chen , Yi Yang , Zhicong Chen , Minyi Liu , Xintong You , Ying Li","doi":"10.1016/j.colsuc.2025.100063","DOIUrl":"10.1016/j.colsuc.2025.100063","url":null,"abstract":"<div><div>Zeolites have been widely studied due to their excellent adsorption and catalytic properties. However, the single microporous structure of traditional zeolites limits their reaction activity and selectivity. Hierarchical zeolites effectively overcome these limitations and enhance the mass transfer and heat transfer, increasing their applicability and stability. Hierarchical zeolites are prepared by two typical strategies including \"bottom-up\" and \"top-down\" strategies. However, these strategies usually require high energy consumption, long preparation processes, and generate acidic and alkaline waste. Solid transformation synthesis offers an efficient and green route for hierarchical zeolite preparation. Hierarchical zeolites can enhance activity and/or selectivity in catalysis (e.g. MTO and MTG reactions) and adsorption (e.g. VOCs, methylene blue removal) compared to traditional microporous zeolites. This review aims to illustrate the state-of-art development of hierarchical zeolites synthesized by solid transformation methods, concerning their production and application. Hierarchical zeolite synthesized by solid transformation method has shown promising potential in many fields, such as environmental remediation, catalysis production, energy storage and so on. Therefore, it is of great significance to pave its way to the practical application, and their synthetic conditions and structural changes are worth further investigation.</div></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"3 ","pages":"Article 100063"},"PeriodicalIF":0.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143563739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Rod-shaped copper-based metal-organic framework: An efficient UV-activated photocatalyst for Congo Red degradation","authors":"Asmita De, Sumit Mishra","doi":"10.1016/j.colsuc.2025.100080","DOIUrl":"10.1016/j.colsuc.2025.100080","url":null,"abstract":"<div><div>Amid growing concerns over industrial dye pollution, a new engineered rod-shaped copper-based metal-organic framework (Cu-MOF) offers a promising solution for efficient wastewater treatment. Synthesized through self-assembly method, this Cu-MOF was characterized using FTIR, Raman spectroscopy, XRD, FESEM, EDX, and TGA to establish its structural and thermal integrity. Electrochemical analysis showed its promising redox behaviour. Cu-MOF distinguishes itself through its remarkable efficiency in degrading Congo Red (CR), a well-known industrial dye pollutant. With a narrow band gap of 2.36 eV, as revealed by UV-Vis diffuse reflectance spectroscopy (DRS), the Cu-MOF harnesses UV light efficiently, achieving a 93.5 % degradation rate. The photocatalytic activity was further enhanced by introducing hydrogen peroxide, which acts as a scavenger for charge carriers, curbing recombination losses. A detailed mechanism explaining the degradation process was proposed alongside kinetics studies and mass spectrometric analysis that unveiled the degradation products and suggested a degradation pathway. This study not only highlights the environmental potential of Cu-MOF but also paves the way for advanced materials in wastewater treatment applications.</div></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"3 ","pages":"Article 100080"},"PeriodicalIF":0.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145010383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}