Environmental Nanotechnology, Monitoring and Management最新文献

{"title":"Zeolite functionalized with metal ions: A dual strategy for water purification − removal of sertraline hydrochloride and pathogenic bacteria","authors":"Laiza Bergamasco Beltran ,&nbsp;Anna Carla Ribeiro ,&nbsp;Taynara Basso Vidovix ,&nbsp;Gessica Wernke ,&nbsp;Luis Fernando Cusioli ,&nbsp;João Carlos Palazzo de Mello ,&nbsp;Benício Alves de Abreu Filho ,&nbsp;Rosângela Bergamasco ,&nbsp;Angélica Marquetotti Salcedo Vieira","doi":"10.1016/j.enmm.2025.101060","DOIUrl":"10.1016/j.enmm.2025.101060","url":null,"abstract":"<div><div>Sertraline hydrochloride (SER) is widely used to treat depression, anxiety, and other disorders, but its presence in global water bodies underscores the need for innovative water treatment solutions. This study introduces a novel adsorbent developed through a sustainable approach, where natural zeolites were functionalized with copper oxide nanoparticles (NZ_NPCuO) to enhance SER removal from contaminated water. Copper oxide nanoparticles were synthesized via a green method using Barbatimão (<em>Stryphnodendron polyphyllum</em> Mart.) stem bark extract. Comprehensive characterization techniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), X-Ray Diffraction (XRD), X-Ray Fluorescence (XRF), leaching tests, and zeta potential measurements validated the successful formation and chemical stability of the nanoparticles. SER adsorption tests revealed a maximum capacity (q_max) of 25.19 mg/g at 298 K, achieving equilibrium within 960 min. The Elovich and Langmuir models were determined to best describe the kinetic and isothermal data, respectively. Thermodynamic analyses indicated that the adsorption process is exothermic, spontaneous, and reversible. Potential adsorption mechanisms included hydrogen bonding, π-interactions, and electrostatic attraction. We also evaluated the antibacterial properties of NZ_NPCuO using the disk diffusion method against Gram-positive and Gram-negative bacteria, including <em>Staphylococcus aureus</em>, <em>Escherichia coli</em>, and <em>Pseudomonas aeruginosa</em>, resulting in inhibition zones of 26 mm, 7.5 mm, and 14 mm, respectively. Thus, the proposed composite shows great potential for SER removal from wastewater and offers a promising alternative for developing effective antimicrobial agents for different proposals, particularly for microbiological water treatment.</div></div>","PeriodicalId":11716,"journal":{"name":"Environmental Nanotechnology, Monitoring and Management","volume":"23 ","pages":"Article 101060"},"PeriodicalIF":0.0,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696802","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":"Analysis of pathogenic microorganisms in hospital effluents: A statistical approach to understanding antibiotic resistance and environmental health risks","authors":"Fatimazahra Sayerh ,&nbsp;Latifa Mouhir ,&nbsp;Laila Saafadi ,&nbsp;Ilham Nassri ,&nbsp;Abdelmoula El Ouardi ,&nbsp;Najia Ameur","doi":"10.1016/j.enmm.2025.101059","DOIUrl":"10.1016/j.enmm.2025.101059","url":null,"abstract":"<div><div>Antibiotic resistance is a significant public health issue in the fight against infectious diseases, and hospital effluent is a special category of liquid waste, hazardous because of its contagious and toxic characteristics. However, these effluents are becoming uncontrollable, and the problem of their discharge into the environment is becoming increasingly important, especially as hospital effluents are a source of antibiotic bacteria. This work aims to analyze hospital effluents from two prefectural hospitals in the southwest region of Morocco (Temara-Sale towns) by assessing the microbiological quality and diversity of antibiotic-resistant bacteria in these effluents collected via weekly spot sampling. Samples taken from both sites showed high loads of fecal indicator bacteria and pathogens, particularly total coliforms, with levels ranging from 10² and 7,5 × 10⁴ UFC/100 ml, fecal coliforms (8,1 × 10⁶ UFC/100 ml), <em>Escherichia coli</em> (5,1 × 10⁶ UFC/100 ml), <em>intestinal enterococci</em> (8,1 × 10³ UFC/100 ml), <em>Staphylococcus aureus</em> (6,6 × 10⁶ UFC/100 ml) and <em>Pseudomonas aeruginosa</em> (7,9 × 10⁶ UFC/100 ml). The study of antibiotic resistance in strains isolated from hospital effluent revealed that of the 75 isolates examined, <em>Escherichia coli</em> was the most commonly detected isolate in both hospitals, with a prevalence of 42 % at PHT Hospital and 47 % at PHS Hospital. It was followed by <em>Klebsiella pneumonia</em>, <em>Pseudomonas aeruginosa</em>, and <em>Staphylococcus aureus</em>, with respective prevalences of 29 %, 16 %, and 12 % at PHT Hospital, and 16 %, 22 % and 13 % at PHS Hospital. The results show varying resistance rates to different antimicrobials, with high levels of resistance observed with antibiotics belonging to the beta-lactam class. Characterization of the hospital effluents from the two hospitals studied showed that these effluents present health and environmental risks that qualify the hospital-environment interface as a place conducive to the transfer of resistance, thus necessitating the urgent development of specific treatment methods before discharge into the natural environment.</div></div>","PeriodicalId":11716,"journal":{"name":"Environmental Nanotechnology, Monitoring and Management","volume":"23 ","pages":"Article 101059"},"PeriodicalIF":0.0,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562015","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":"Biosynthesis of silver nanoparticles using Macrococcus caseolyticus strain AgD isolated from crude oil-contaminated water samples and their application in remediation of crude oil contamination in the Niger Delta aquatic environment","authors":"A.A. Ikhumetse ,&nbsp;O.P. Abioye ,&nbsp;A.S. Kovo ,&nbsp;U.J.J. Ijah","doi":"10.1016/j.enmm.2025.101057","DOIUrl":"10.1016/j.enmm.2025.101057","url":null,"abstract":"<div><div>This study was carried out to synthesize bacterial silver nanoparticles (AgNPs) using <em>Macrococcus caseolyticus</em> strain AgD for remediation of crude oil contamination in aquatic environment. Characterization was done to ascertain the size, crystallinity, morphology and elemental composition of the bacterial AgNP, which was used for the removal of Total Petroleum Hydrocarbons (TPH) in the water samples. Response surface methodology (RSM) was used for design and optimization of the TPH response. The results indicated that TPH in some water samples were above permissible limits given by the World Health Organization. The results of 16S rDNA sequencing showed that the isolate is related to <em>Macrococcus caseolyticus.</em> The optical properties of AgNPs showed a peak at 425 nm while the XRD patterns revealed crystallinity with average crystallite size of 25.25204 ± 5.89 nm. The RSM showed a good fit for 2FI regression model for the AgNP as elucidated by the coefficient of determination with R² value of 0.9295. Run 1 (contact time 22.5 mins, stirring speed 1625 rpm, dosage 0.275 g, temperature 55 °C) obtained the highest TPH removal of 94.26 %, which was higher than the predicted (93.15 %) using the bacterial strain. The maximum predicted TPH removal was however 94.02 % at optimum factors of contact time (22.5 mins /100 mL), stirring speed (1620 rpm/100 mL), dosage (0.3206 g) and temperature (67.5 °C). The study showed that the bacterial strain was useful in the synthesis of AgNPs to enhance the efficient removal of contaminants in water samples, and that the model developed (2FI) using RSM technique was useful in predicting optimal TPH removal.</div></div>","PeriodicalId":11716,"journal":{"name":"Environmental Nanotechnology, Monitoring and Management","volume":"23 ","pages":"Article 101057"},"PeriodicalIF":0.0,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471416","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":"Impact of traffic and other sources on heavy metal pollution of urban soils (Lublin, Poland)","authors":"Wojciech Zgłobicki,&nbsp;Małgorzata Telecka,&nbsp;Paulina Hałas,&nbsp;Małgorzata Bis","doi":"10.1016/j.enmm.2025.101058","DOIUrl":"10.1016/j.enmm.2025.101058","url":null,"abstract":"<div><div>Information on the heavy metals content in urban soils is important for a comprehensive assessment of environmental pollution. A significant<!--> <!-->source of soil pollution can be traffic-related emissions. The objective of the study was to assess the spatial pattern, sources and level of soil pollution in medium-sized city (Lublin, E Poland). Concentrations of As, Cd, Cr, Cu, Ni, Pb and Zn were determined in 62 samples of road dust and 90 soil samples. We applied<!--> <!-->following: geochemical indices to determine the degree of pollution: (i) geoaccumulation index, (ii) pollution index and (iii) index of ecological risk factor. PCA and CA were also used to assess sources of pollution. Geochemical indices showed<!--> <!-->medium to high pollution of dust and roadside soils<!--> <!-->by Cu and Zn and high for Cd, Cu and Zn in post-industrial soils. The results of the statistical analyses indicated the same pollution sources for road dust and roadside soils. It is represented by transport-related emissions. There is no statistical relationship between the concentration of heavy metals in road dust and roadside soil pollution due to the nature of their accumulation − long-lasting in the case of soils. The air transport of heavy metals is carried out over a short distance. Elevated concentrations are found near the sources of the pollutants. Residential soils are not polluted by heavy metals.</div></div>","PeriodicalId":11716,"journal":{"name":"Environmental Nanotechnology, Monitoring and Management","volume":"23 ","pages":"Article 101058"},"PeriodicalIF":0.0,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455026","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":"The hidden threat of microplastics in urban freshwater ecosystem: A comprehensive review","authors":"Md. Fahim Murshed,&nbsp;Nusrat Fardin Arpita,&nbsp;Amit Hasan Anik,&nbsp;Maisha Binte Sultan","doi":"10.1016/j.enmm.2025.101054","DOIUrl":"10.1016/j.enmm.2025.101054","url":null,"abstract":"<div><div>Microplastic (MP) pollution has become a pressing environmental issue, particularly in urban freshwater ecosystems, where it poses significant risks to water quality and public health. By integrating new data and insights, this article aims to deepen the understanding of MP contamination in urban freshwater ecosystems and its broader environmental implications. This article reviews the current literature of MPs focusing on urban freshwater ecosystems, often overlooked in favor of marine settings. It uniquely addresses the sources, pathways, and biomagnification of MPs in these environments, linking ecological effects to public health, and advocating for collaborative stakeholder action and innovative management strategies. This holistic approach provides a comprehensive view of MP pollution in urban contexts where aquatic organisms can ingest MPs present in these freshwater ecosystems and move through the food chain thus ultimately reaching the human body. The effects of MPs on the food chain are examined, particularly how they accumulate in organisms, transfer between different levels of the food chain, and increase in concentration as they move up through different trophic levels. To successfully tackle MP contamination, it pushes for collaborative action among stakeholders, including researchers, policymakers, and the community. It calls for enhanced research efforts to fill existing knowledge gaps and develop innovative management strategies to mitigate the impacts of MPs. Ultimately, this serves as a crucial resource for informing future policies and initiatives to preserve water quality and protect public health in the face of growing plastic pollution.</div></div>","PeriodicalId":11716,"journal":{"name":"Environmental Nanotechnology, Monitoring and Management","volume":"23 ","pages":"Article 101054"},"PeriodicalIF":0.0,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143445504","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":"The prospect of using polyvinyl chloride with -n-hydroxyl amine, a metal binding agent, to adsorb uranium from its aqueous solution","authors":"Abd El-Hakeim T. Kandil ,&nbsp;Bahig M. Atia ,&nbsp;Farida M.S.E. El-Dars ,&nbsp;Mohamed Y.M. Hussein ,&nbsp;Mohamed F. Cheira","doi":"10.1016/j.enmm.2025.101055","DOIUrl":"10.1016/j.enmm.2025.101055","url":null,"abstract":"<div><div>Polyvinyl chloride-based N-hydroxyl amine (PVC-NHA) was demonstrated as a straightforward and innovative way to remove U(VI) from solutions. The PVC-NHA composite was exposed to exact testing using various techniques, including FT-IR, TGA, BET, ¹H NMR, SEM-EDX, ¹³C NMR, and GC–MS assessments, all of which demonstrated the successful preparation of PVC-NHA. The specifications for this composite were accurately carried out, guaranteeing a good result. The optimization of various experimental parameters led to the refinement of measurements such as pH, temperature, agitation time, starting U(VI) concentration, interfering ions, PVC-NHA composite dose, and eluting agents. The optimization adjustments were gained at a temperature of 25 °C, a pH of 3.5, 15 min agitation time, and 0.63 × 10^-3 mol/L U(VI). The PVC-NHA composite exhibited an impressive maximum uptake capacity of 63 mg/g. This uptake capacity was equivalent to a remarkable 126 mg/L of U(VI) ions. The sorption isotherm modelling showed that Langmuir’s model fitted the practical results quite well, which was superior to the performance of the Freundlich model. The theoretical value obtained from Langmuir’s model is 61.7 mg/g, which closely supports the experimental rate of 63 mg/g. Based on U(VI) kinetic adsorption modelling, the adsorption reaction of U(VI) and PVC-NHA could be accurately illustrated by mixed pseudo-first and second-order kinetic modelling. According to thermodynamics, the adsorption process was spontaneous, exothermic, and highly favorable at tiny temperatures. Notably, the loaded composite could be efficiently eluted using 1 M H₂SO₄, achieving a remarkable 99 % efficiency rate from an economic standpoint. The PVC-NHA composite exposed excellent selectivity towards most interfering ions, demonstrating a high tolerance limit.</div></div>","PeriodicalId":11716,"journal":{"name":"Environmental Nanotechnology, Monitoring and Management","volume":"23 ","pages":"Article 101055"},"PeriodicalIF":0.0,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430279","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":"Development of fly ash/melamine composites for crystal violate dye removal from aqueous media","authors":"Imran Khan Rind ,&nbsp;Ahmet Sarı ,&nbsp;Mustafa Tuzen ,&nbsp;Muhammad Farooque Lanjwani ,&nbsp;Tawfik A. Saleh","doi":"10.1016/j.enmm.2025.101056","DOIUrl":"10.1016/j.enmm.2025.101056","url":null,"abstract":"<div><div>Fly ash (FA) as a low-cost and easily obtainable by-product from thermal power plants is considered for the decontamination of inorganic and organic pollutants from wastewater. In this work, FA was grafted with melamine and the obtained composite was used for the adsorption of crystal violet (CV) from water. By modification of melamine, the surface of FA was enhanced with amide groups as effective binding groups for CV molecules and therefore achieved higher sorption capacity. The chemical and textural characteristics of the FA/Melamine composite were studied by scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR). Factorial designing was used for evaluating optimum adsorption parameters. ANOVA analysis of the P-value of individuals and combined variables was significant due to a P-value of less than 0.05 and a higher F-value. Equilibrium results show a monolayer isotherm model by Langmuir isotherm model with a maximum CV uptake capacity of 487 mg g⁻¹ under optimized conditions (250 mg adsorbent dosage, 10 ppm concentration, 30 min contact time and pH 6.0). Kinetic studies revealed that CV removal was nominated by the pseudo-second-order (PSO) model. CV dye molecules were adsorbed onto FA/Melamine composite via electrostatic attractions dipole–dipole interactions and n-π stacking interactions. Furthermore, the obtained results exposed that the synthesized FA/Melamine composite can be assessed as a promising sorbent for CV dye removal with high adsorption capacity.</div></div>","PeriodicalId":11716,"journal":{"name":"Environmental Nanotechnology, Monitoring and Management","volume":"23 ","pages":"Article 101056"},"PeriodicalIF":0.0,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437394","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":"Reactive transport and sorption behavior of pollutants in presence of redox-sensitive nano Fe0 impregnated graphene: Advancing towards continuous water filtration","authors":"Jai Kishan Rajak ,&nbsp;Nitin Khandelwal ,&nbsp;Zahid Ahmad Ganie ,&nbsp;Dieter Schild ,&nbsp;Gopala Krishna Darbha","doi":"10.1016/j.enmm.2025.101053","DOIUrl":"10.1016/j.enmm.2025.101053","url":null,"abstract":"<div><div>Fe⁰ impregnated graphene has shown promising candidature for removing both organic and inorganic contaminants from aqueous solutions. The current study investigates and fills some of the missing gaps in their large-scale environmental applicability, including- contaminants removal from complex water matrices, simultaneous separation of multiple contaminants, and continuous water filtration possibilities. Both metals and dyes were chosen of varying ionic behavior to broaden the scope of the work.</div><div>One-step graphene oxide (GO) delamination and iron reduction were performed to prepare Fe⁰ impregnated graphene (GOI) composite. Results have shown growth of smaller spherical Fe⁰ nanoparticles (&lt; 50 nm) on graphene with good dispersion and preserved redox state. XPS analysis of reaction precipitate confirmed that GOI could reduce CrO₄^2- to less toxic Cr(III) through reductive sorption. Removal capacities in batch mode were Ni (30.5 mg/g) &lt; Cr (49.8 mg/g) &lt; Cd (93.7 mg/g) &lt; As (143.6 mg/g) in mono-metallic system. In a multi-metallic system, efficient total metal removal capacity (&gt;340 mg/g) and continuous filtration efficiency (85 mg/g) was observed. GOI composite has also shown efficient removal and continuous separation of cationic methylene blue (81.3 mg/g), anionic methyl orange (79.7 mg/g), and zwitterionic rhodamine-B (31.7 mg/g). Electrostatic attraction on heterogeneous GOI surface, redox transformation, complexation, and co-precipitation with generated iron-oxy-hydroxide were major contaminant removal mechanisms. Results conclude a good potential of GOI composite in the separation of multiple pollutants from environmental matrices and continuous filtration of contaminated waters.</div></div>","PeriodicalId":11716,"journal":{"name":"Environmental Nanotechnology, Monitoring and Management","volume":"23 ","pages":"Article 101053"},"PeriodicalIF":0.0,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422308","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":"Carbon-Based adsorbents for heavy metal removal in Wastewater: Green technology or environmental Burden?","authors":"Yudha Gusti Wibowo","doi":"10.1016/j.enmm.2025.101051","DOIUrl":"10.1016/j.enmm.2025.101051","url":null,"abstract":"<div><div>Water pollution from industrial, agricultural, and municipal sources demands effective and sustainable treatment solutions. Carbon-based adsorbents, such as activated carbon, biochar, carbon nanotubes, and graphene, offer promising pollutant removal capabilities due to their high adsorption capacities and versatility. However, their energy-intensive production, emissions, and challenges in regeneration raise concerns about environmental sustainability. This is the first study to provide a comprehensive evaluation of both the performance and environmental trade-offs associated with carbon-based adsorbents. Novelty of this study presents a new perspective, highlighting the double-edged nature of these materials—they offer significant pollutant removal potential but impose environmental burdens through energy consumption and chemical waste. It explores key applications, challenges, and trade-offs, such as variability in adsorption efficiency, high production costs, and risks of nanoparticle toxicity. Additionally, this study emphasizes the need for green production processes, composite adsorbents, and sustainable regeneration technologies to optimize their use. This review contributes a new perspective by addressing the dual role of carbon-based adsorbents as both solutions for and contributors to environmental challenges, providing actionable insights for advancing their application in sustainable water treatment systems.</div></div>","PeriodicalId":11716,"journal":{"name":"Environmental Nanotechnology, Monitoring and Management","volume":"23 ","pages":"Article 101051"},"PeriodicalIF":0.0,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430222","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":"Photocatalytic degradation of antibiotics using Cu doped-SnO2/CQDs nanocomposites","authors":"L.A.S. Adolf Marvelraj,&nbsp;V.S. Priya","doi":"10.1016/j.enmm.2025.101052","DOIUrl":"10.1016/j.enmm.2025.101052","url":null,"abstract":"<div><div>In this study, a copper-doped tin oxide/carbon quantum dot (CuSCs) nanocomposite was developed and applied for the photocatalytic degradation of antibiotics, specifically tetracycline (TCH) and sulfamethazine (SMT). The nanocomposite was characterized by the presence of metallic, carboxyl, and hydroxyl functional groups, with copper and CQDs uniformly distributed on the SnO₂ surface. The incorporation of Cu reduced the bandgap of the material, enhancing its visible-light absorption and photocatalytic activity. At an optimal dose of <em>40 mg/100 mL</em>, the nanocomposite achieved <em>100 %</em> degradation of TCH and <em>72 %</em> degradation of SMT within <em>120 min</em>. The variation in degradation efficiency was attributed to reactive species generated during photocatalysis, which preferentially disrupted the benzene ring in TCH over the sulfur-nitrogen bond in SMT. Maximum degradation was observed at an initial antibiotic concentration of <em>10 ppm</em>. Light absorption by the solution was found to limit the production of oxidizing species, while pH optimization studies showed the highest degradation efficiencies at neutral pH (<em>6.7–7.0</em>). High-performance liquid chromatography-mass spectrometry (HPLC-MS) identified possible TCH degradation pathways, and mineralization experiments demonstrated a <em>47 %</em> reduction in total organic carbon (TOC) for TCH within <em>120 min</em>. Reactive species trapping experiments revealed that h⁺ and O₂•⁻ were the primary contributors to TCH degradation. These findings highlight the potential of CuSCs nanocomposites for the efficient degradation of antibiotic pollutants under visible-light irradiation.</div></div>","PeriodicalId":11716,"journal":{"name":"Environmental Nanotechnology, Monitoring and Management","volume":"23 ","pages":"Article 101052"},"PeriodicalIF":0.0,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422307","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}