Environmental Nanotechnology, Monitoring and Management最新文献

{"title":"Spatial distribution and risk assessment of potentially toxic elements in coastal mangrove floodplain Top-Soils of Bangladesh","authors":"Rabeya Sultana ,&nbsp;Md. Riad Hossain ,&nbsp;Md Musfike Meraz ,&nbsp;Mehidi Ahmmed ,&nbsp;Shahidur R. Khan ,&nbsp;Tasrina Rabia Choudhury","doi":"10.1016/j.enmm.2025.101044","DOIUrl":"10.1016/j.enmm.2025.101044","url":null,"abstract":"<div><div>Soil pollution caused by human activity is becoming an increasingly urgent global concern. Floodplain soils are particularly susceptible to contamination due to their role as temporary sinks for sediments, nutrients, and pollutants transported by the river systems. Mangrove floodplains possess significant ecological value, being unique ecosystems that are especially vulnerable to pollution, particularly from potentially toxic elements (PTEs). This study provides a comprehensive analysis of the concentration and spatial distribution of PTEs in the soils of Koyra Upazila, Bangladesh, a region characterized by a coastal mangrove ecosystem. A total of 60 soil samples were collected from three subdivisions to assess pollution levels. The samples were subjected to acid digestion (65 % HNO3 and HClO4 in a 4:1 ratio) and were analyzed using Atomic Absorption Spectroscopy (AAS) with a varian system (Varian AA240 FS). The investigated PTEs, ranked by decreasing concentration, were Zn &gt; Cr &gt; Pb &gt; Ni &gt; Cd &gt; Hg. Zn exhibited the highest average concentration (67.15 ± 12.24 mg/kg), whereas Mercury had the lowest (0.02 ± 0.04 mg/kg). Distribution patterns, illustrated by Q-Q plots, revealed that Pb and Zn data closely followed a normal distribution, while Cd, Cr, and Hg displayed significant deviations, suggesting skewed distributions influenced by both natural variability and anthropogenic activities. Assessments using the Geo-accumulation Index (Igeo), Pollution Load Index (PLI), and Nemerow Integrated Pollution Index (NIPI) indicated that the soils were generally uncontaminated, although moderate pollution levels of Pb and Zn observed in specific locations. Potential Ecological Risk Index (PERI) analyses suggested minimal ecological risks, despite the moderate pollution levels revealed by PLI. Health risk assessments highlighted elevated non-carcinogenic and carcinogenic risks for children, particularly in the central and southern regions of the study area. Furthermore, a comparative analysis against international soil quality standards from Canada, the Netherlands, and Australia confirmed that the PTEs concentrations in the study area remained within permissible limits, indicating predominantly natural origins with minimal anthropogenic influence. The study establishes a critical baseline for PTEs concentration in the mangrove floodplain soils of Koyra Upazila, revealing localized risks, particularly in urban areas like Koyra union. While most PTE levels are within permissible limits, the findings highlight the need for periodic monitoring and targeted mitigation measures to protect vulnerable ecosystems and public health.</div></div>","PeriodicalId":11716,"journal":{"name":"Environmental Nanotechnology, Monitoring and Management","volume":"23 ","pages":"Article 101044"},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143103966","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 the influences of seasonal water hydrochemistry variations and biochar-assisted heavy metal removal in Delhi’s urban wetlands: Implications for management strategies","authors":"Gourav Sharma,&nbsp;Abhishek Kumar Chaubey,&nbsp;Kamal Kishor,&nbsp;Dinesh Mohan","doi":"10.1016/j.enmm.2024.101025","DOIUrl":"10.1016/j.enmm.2024.101025","url":null,"abstract":"<div><div>Wetlands globally, crucial to both society and the environment, are losing their ecological and hydrological functions due to growing human populations and activities. This decline is particularly severe in metropolitan wetlands, where land use changes and development pressures are more intense. This study focuses on evaluating the water quality parameters of Delhi’s five urban wetlands including Hauz Khas Lake (HZL), Sanjay Lake (SL), Bhalswa Lake (BL), Vasant Kunj Lake (VKL), and Sanjay Van Lake (SVL) during winter (14—17^th January 2023) and summer (13—15^th May 2023) seasons. A total of 200 samples (20 samples from each lake) from HZL, SL, BL, VKL, and SVL were collected and analysed for 24 physicochemical parameters in both the seasons. Multivariate analysis was performed using a correlation matrix and principal component analysis (PCA)–biplot. Hydrochemical analysis was performed using Piper trilinear and Gibbs diagrams. Water suitability for irrigation was accessed using the chlorinity index, sodium adsorption ratio (SAR), Wilcox diagram, and Kelly index/ratio. Suitability for industrial purposes was evaluated using the Langelier saturation index (LSI) and Ryznar stability index (RSI). Drinking water suitability was assessed through the water quality index (WQI). The average (n = 3) water quality parameter values were compared to BIS and WHO drinking water standards. The average pH for HZL, SL, BL, VKL and SVL was alkaline (ranging from 7.2 to 9.9) in both the seasons. In winter, 4 parameters exceeded BIS permissible limits in HZL, 9 in SL, 12 in BL, 7 in VKL, and 6 in SVL. A similar trend was observed in summer, indicating that SVL and HZL are less polluted than SL, BL, and VKL. The chlorinity index, SAR, Kelly ratio, and Wilcox diagram indicated BL water’s unsuitability for irrigation in both seasons. RSI values above 8 for HZL, SL, BL, VKL, and SVL suggest corrosive nature of the water samples collected in both seasons. The main factors affecting the WQI were heavy metals (primarily Cd²⁺, Cr_T, Ni²⁺, Pb²⁺) and fluoride contamination. Finally, Himalayan pine needle biochar was prepared and used for <span><math><mrow><msup><mrow><mi>P</mi><mi>b</mi></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></mrow></math></span> remediation from wetland water samples collected in both seasons. The findings of this study provide valuable insights into the water quality characteristics of the five wetlands during two seasons, aiding in water management and decision-making processes for sustainable utilization and conservation of water resources.</div></div>","PeriodicalId":11716,"journal":{"name":"Environmental Nanotechnology, Monitoring and Management","volume":"23 ","pages":"Article 101025"},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104516","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":"Enhanced PVA-bioplastic membranes with nanocellulose and hydroxyapatite derived from blood clam shells","authors":"Femiana Gapsari ,&nbsp;Christina Wahyu Kartikowati ,&nbsp;Kartika A. Madurani ,&nbsp;Afifah Harmayanti ,&nbsp;Abdul Mudjib Sulaiman","doi":"10.1016/j.enmm.2024.101035","DOIUrl":"10.1016/j.enmm.2024.101035","url":null,"abstract":"<div><div>Bioplastic membranes, particularly those based on polyvinyl alcohol (PVA), are increasingly explored for their environmental benefits and diverse applications. However, these bioplastics often suffer from high water absorption and limited mechanical durability, restricting their practical use compared to conventional plastics. This study aims to address these limitations by incorporating nanocellulose from <em>Cordia dichotoma</em> fiber (CDf) and a hydroxyapatite (HA) coating derived from blood clam shells—a novel and sustainable approach. The HA-coated PVA-nanocellulose bioplastic was evaluated for tensile strength, water absorption, and antibacterial activity, using Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). Results showed substantial improvements, with tensile strength increasing from 5.62 to 12.63 MPa and elastic modulus from 6.73 to 15.85 MPa, attributed to enhanced cross-linking from the HA layer. Additionally, antibacterial testing showed weak inhibition zones (&lt;5 mm) against <em>E. coli</em> and <em>S. aureus</em>, indicating mild antimicrobial properties. This research contributes to sustainable bioplastic technologies by leveraging waste-derived materials to improve functionality, making these biocomposites promising for packaging, water purification and biomedical applications, and other fields requiring durable, eco-friendly materials.</div></div>","PeriodicalId":11716,"journal":{"name":"Environmental Nanotechnology, Monitoring and Management","volume":"23 ","pages":"Article 101035"},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104519","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":"Feedstock selection influences performance and mechanism of DNA adsorption onto biochar","authors":"Michael P. Schmidt ,&nbsp;Sierra Rupp ,&nbsp;Daniel J. Ashworth ,&nbsp;Duc Phan ,&nbsp;Ananda Bhattacharjee ,&nbsp;Jorge F.S. Ferreira ,&nbsp;Yujie Men ,&nbsp;Abasiofiok Mark Ibekwe","doi":"10.1016/j.enmm.2025.101040","DOIUrl":"10.1016/j.enmm.2025.101040","url":null,"abstract":"<div><div>Antibiotic-resistance genes (ARGs) in wastewater may promote antimicrobial resistance in consumers of crops irrigated with wastewater. Removal of DNA from wastewater may thus mitigate potential environmental risks associated with irrigation and environmental release of recycled wastewater. Although biochar adsorbents are a potentially cost-effective strategy for removing DNA from water, biochar feedstock influence on performance has not been studied across a range of feedstock classes. Our objective was to produce biochar from 5 distinct feedstocks (manure (MN), black mustard (<em>Brassica nigra</em>) (MU), orange peel (OP), pine pellet (PP) and macadamia nutshell (MNS)) at a fixed pyrolysis temperature (500 °C), characterize biochars and relate characteristics to DNA adsorption. Adsorption reached equilibrium within two hours and kinetics fit the pseudo-second order model. Adsorption rates increased from MNS, PP, OP, MN to MU, with rates of 3.06 × 10⁻², 5.65 × 10⁻², 1.78 × 10⁻¹, 4.00 × 10⁻¹ and 5.05 × 10⁻¹ mg g⁻¹ min⁻¹, respectively. Adsorption isotherms fit the Freundlich model, with affinities increasing from PP, MNS, OP, MN to MU (<em>K_d</em> = 1.30 × 10⁻², 1.35 × 10⁻², 1.27 × 10⁻¹, 1.96 × 10⁻¹ and 1.42, respectively). DNA adsorption on biochars increased with ionic strength from I = 0 – 0.10 M except for MN. Ca²⁺ addition increased adsorption for biochars at I = 0.01 and 0.10 M, except for MN, which increased only with I = 0.10 M. Lower sensitivity of adsorption on MN biochar to ionic conditions indicates a different mechanism may control adsorption. The high ash content of MN biochar may favor direct bonding of DNA to ash minerals compared to π-π interactions likely driving DNA adsorption to structural carbon. These findings help understand how feedstock-driven variability in biochars translates to DNA immobilization and will assist researchers and stakeholders in determining the most suitable feedstocks for this purpose.</div></div>","PeriodicalId":11716,"journal":{"name":"Environmental Nanotechnology, Monitoring and Management","volume":"23 ","pages":"Article 101040"},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143103963","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":"Cobalt iron oxide nanorods with multi functions: solvothermal synthesis and characterizations as potent antimicrobial agent and photocatalyst","authors":"Bushra Uzair ,&nbsp;Zukhra Abbasi ,&nbsp;Basma Gul ,&nbsp;Zulqurnain Ali ,&nbsp;Khuram Shahzad ,&nbsp;Sadaf Mushtaq ,&nbsp;Farid Menaa","doi":"10.1016/j.enmm.2025.101079","DOIUrl":"10.1016/j.enmm.2025.101079","url":null,"abstract":"<div><div>The escalating concerns over microbial infections and environmental pollution necessitate the exploration of advanced materials that can effectively address both issues. In this research paper, the microwave-assisted solvothermal method was used to synthesize multifunctional hybrid materials based on cobalt-iron oxide (CoFe2O4) nanorods. X-ray diffraction (XRD), Fourier-Transform Infrared Spectroscopy (FT-IR), and Scanning Electron Microscopy (SEM) analyze the physicochemical properties of the nanomaterial. SEM analysis revealed rod-shaped crystals with an average particle size of 40 nm, while XRD confirmed crystalline nature of cobalt-iron oxide nanoparticles (CIO NRs). The prepared CIO nanorods showed promising antibacterial activity (p &lt; 0.0001) against MDR <em>Pseudomonas aeruginosa</em>, exhibiting a notable zone of inhibition measuring 25 mm. Furthermore, they displayed significant (p &lt; 0.001) antifungal properties inhibiting the growth of <em>Aspergillus flavus</em> (18 mm), <em>Aspergillus niger</em> (23 mm) and <em>Candida albicans</em> (25 mm). Moreover, the CoFe2O4 nanorods inhibited 90 % biofilm formation by <em>Pseudomonas aeruginosa</em> on human teeth, highlighting their potential utility in clinical contexts. Furthermore, CoFe2O4 NRs demonstrated significant efficacy in degrading methylene blue (MB) 96 %, malachite green (MG) 95 %, and methyl orange (MO) 98 % dyes under sunlight irradiation conditions. Together, these findings emphasize the versatility of CIONRs that could add significant value to their applicability in medicine as a solution for diverse microbial infections and water treatment technologies.</div></div>","PeriodicalId":11716,"journal":{"name":"Environmental Nanotechnology, Monitoring and Management","volume":"23 ","pages":"Article 101079"},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144203642","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":"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":"2025-06-01","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":"Pinus radiata forest residue: A bio-adsorbent of choice for Cr (VI) removal from aqueous solution","authors":"Humberto Dax Bonilla Mancilla ,&nbsp;Jenny Del Pino Moreyra ,&nbsp;Juan José Bullon Rosas ,&nbsp;Alfredo Rubén Bernal Marcelo ,&nbsp;Candelaria Tejada Tovar ,&nbsp;Manoj Kumar Jindal ,&nbsp;Devendra Kumar ,&nbsp;Mika Sillanpää ,&nbsp;Djamel Ghernaout","doi":"10.1016/j.enmm.2025.101042","DOIUrl":"10.1016/j.enmm.2025.101042","url":null,"abstract":"<div><div>Hexavalent chromium (Cr(VI)) is a lethally harmful heavy metal that endangers human health and biodiversity worldwide. Conventional Cr(VI) removal procedures are frequently energy-consuming and also emit hazardous byproducts. The use of NaOH-activated <em>Pinus radiata</em> forest residue (PRFR) as a sustainable and adaptable adsorbent for the effective removal of Cr(VI) from aqueous solutions is demonstrated in this work. To validate the adsorption and adsorption mechanism, PRFR was characterized using FTIR (Fourier transform infrared spectroscopy), SEM (Scanning electron microscopy), and XRD (X-ray diffraction) methods. Batch experiment techniques were adopted to optimize the influences of initial concentration, pH, adsorbent dose, temperature, and contact duration for Cr(VI) adsorption, all of which are critical for use on an industrial or commercial scale. After 45 min of contact time, PRFR revealed a high adsorption capacity of 13.947 mg/g with a removal effectiveness of 99.12 % for Cr(VI). The adsorbent was reusable for more than three cycles. PRFR is a nature-friendly adsorbent that can be used for a variety of purposes, including wastewater treatment, industrial effluent remediation, and environmental restoration, because it is inexpensive and easily accessible.</div></div>","PeriodicalId":11716,"journal":{"name":"Environmental Nanotechnology, Monitoring and Management","volume":"23 ","pages":"Article 101042"},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143103964","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":"Fabrication of post-synthetic modified Fe (III)-based metal organic framework for the electrochemical detection of 4-amino phenol","authors":"Diksha ,&nbsp;Anjali ,&nbsp;Anu Prathap M. Udayan ,&nbsp;Balwinder Kaur ,&nbsp;Anita Gupta ,&nbsp;Megha ,&nbsp;Veeranna Yempally ,&nbsp;Harminder Kaur","doi":"10.1016/j.enmm.2025.101072","DOIUrl":"10.1016/j.enmm.2025.101072","url":null,"abstract":"<div><div>4-Aminophenol (4-AP) is an aromatic compound with reactive hydroxyl and amino groups. It is widely used in the production of dyes, pharmaceuticals, and polymer stabilizers but poses significant environmental and health hazards. Therefore, developing a reliable method for the detection of trace amounts of 4-AP is crucial. This study focuses on the fabrication of a cost-effective electrochemical sensor for 4-AP based on the post-synthetic modification of Fe-MIL-101-NH₂. The sensor demonstrated a linear detection range of 0.5–400 µM with a low limit of detection (LOD) of 0.12 µM and a sensitivity value of 0.29 µA/µM/cm² under optimized conditions. The synergistic effect of Fe-MIL-101-NH₂, the Schiff base, and nickel enhances its electronic properties, including reduced band gap energy, lower charge transfer resistance, and improved conductivity, leading to superior redox behavior of 4-AP. Key features of the sensor include high sensitivity, favorable selectivity, outstanding stability, and excellent reusability. It exhibits minimal interference from common organic and inorganic species, making it suitable for real-world applications. The use of earth-abundant materials further underscores its cost-effectiveness and environmental sustainability. The sensor has been applied in detecting 4-AP in tap water and paracetamol samples and achieved positive results further demonstrating its practicality for real-world applications.</div></div>","PeriodicalId":11716,"journal":{"name":"Environmental Nanotechnology, Monitoring and Management","volume":"23 ","pages":"Article 101072"},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143881655","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":"Removal of Cu and Co ions form polluted water via Bi-TiO2 loaded on g-C3N4 nanostructures","authors":"Abueliz Modwi ,&nbsp;Ahmed Algarni ,&nbsp;Ibrahim Sulaiman Almuzaini ,&nbsp;Abdulaziz I. Alromaeh ,&nbsp;Fahad Ibrahim Alghuraybi ,&nbsp;Tahani M. Alresheedi ,&nbsp;Abdulaziz A. Alharbi","doi":"10.1016/j.enmm.2025.101063","DOIUrl":"10.1016/j.enmm.2025.101063","url":null,"abstract":"<div><div>This study surveys the impact of Bi@TiO₂ on the separate and combined adsorption of Cu (II) and Co (II) heavy metals in a water-based solution using g-C₃N₄ nanosheets. The Bi@TiO₂@CN nanostructures are effectively produced using the sol–gel technique and ultrasound method. The manufactured materials of Bi@TiO₂@CN are confirmed by SEM, EDX, XRD, FTIR, and XPS characterizations. The BET surface area was 45.43 m²/g, and the pore size distribution is 1.5406 nm. Nanostructures exhibit significant adsorption capabilities for Cu (II) (562.7 mg/g) and Co (II) (547 mg/g) after 24 h under optimum experimental conditions. The adsorption isotherm models have a strong agreement with the Langmuir isotherm, while the investigation on kinetics model fitting demonstrates an excellent fit with the pseudo-second-order. Furthermore, the adsorbent composite was regenerated in four cycles without loss of efficiency or stability. This study offers valuable insights into the significance of Bi@TiO₂@CN nanostructures in achieving extremely efficient, fast, and simultaneous removal of heavy metals.</div></div>","PeriodicalId":11716,"journal":{"name":"Environmental Nanotechnology, Monitoring and Management","volume":"23 ","pages":"Article 101063"},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715420","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":"Phosphate Removal from Aqueous Solution by Electric Arc Furnace Dust as High-Performance and Cost-Effective Adsorbent","authors":"Zeinab Purzal ,&nbsp;Mehdi Alizadeh ,&nbsp;Farnaz Heidari Laybidi ,&nbsp;Mohsen Alizadeh","doi":"10.1016/j.enmm.2025.101078","DOIUrl":"10.1016/j.enmm.2025.101078","url":null,"abstract":"<div><div>This study explores the processing of Electric Arc Furnace Dust (EAFD), a hazardous steelmaking by-product, for the efficient adsorption of phosphate ions from agricultural wastewater. To detoxify EAFD and enhance its adsorption performance, three washing methods hot water, alkaline NaOH, and acetic acid leaching were compared, with acetic acid proving the most effective in removing heavy metals such as lead. Comprehensive characterizations including X-ray diffraction (XRD), X-ray fluorescence (XRF), fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FE-SEM), dynamic light scattering (DLS), vibrating sample manetometer (VSM) and elemental concentration analysis by inductively coupled plasma mass spectrometry (ICP-MS) confirmed the formation of favorable surface functional groups, nanoscale particle size (∼233 nm), and magnetic properties facilitating easy separation. Adsorption experiments were conducted under varying pH, temperature, adsorbent dosage, and contact time, achieving a maximum phosphate removal efficiency of ∼ 90 % from 500 mg/L solutions at pH 2. The adsorption mechanism was attributed to electrostatic interactions between phosphate ions and positively charged sites on the EAFD surface. Thermodynamic analysis revealed that the process was spontaneous and endothermic, while kinetic modeling indicated a good fit with Langmuir and Freundlich isotherms (R² &gt; 0.99). After adsorption, SEM-EDS and FTIR analyses confirmed phosphate capture and surface modifications. These results demonstrate that processed EAFD, due to its magnetic recyclability, low cost, and high adsorption capacity, can serve as an effective and sustainable adsorbent for phosphate removal, offering a promising solution for wastewater treatment and valorization of industrial waste.</div></div>","PeriodicalId":11716,"journal":{"name":"Environmental Nanotechnology, Monitoring and Management","volume":"23 ","pages":"Article 101078"},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107611","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}