Journal of hazardous materials advances最新文献

{"title":"An efficient and cost-effective advanced reduction process for nitrate removal from various real saline waters using carbon-doped TiO2","authors":"Vahid Aghabalaei ,&nbsp;Shima Mardani ,&nbsp;Majid Baghdadi ,&nbsp;Behnoush Aminzadeh Goharrizi ,&nbsp;Zahra Noorimotlagh","doi":"10.1016/j.hazadv.2025.100885","DOIUrl":"10.1016/j.hazadv.2025.100885","url":null,"abstract":"<div><div>To meet the Sustainable Development Goals, NO₃^- must be removed from drinking water. NO₃^- is removed using IX technology, but waste disposal and the significant amount of NaCl required to make fresh brine have become problems for the economy and the environment. This work utilized an innovative, economical, and eco-friendly photocatalytic denitrification (PD) under visible light exposure for treating and reuse of IX brine waste (IXWB) using glycerol. FESEM-EDX, XRD, BET, FTIR, elemental mapping, and UV-Vis absorption spectra were used for physicochemical characteristics of carbon-doped TiO₂ (CT) nanocomposite. CCD-RSM was utilized for the experimental design and process optimization. With increasing calcination temperature, anatase transformed to rutile, resulting in larger particle sizes/ crystallites and narrower optical band gaps. Additionally, the band gap decreased from 2.98 to 2.58 eV after carbon doping. Under ideal conditions with a mixed A (55 %)/R (45 %) phase of CT sample, the highest PD efficiency was resulted 94 % and 68 % with formic acid and glycerol, respectively. The application of glycerol as an economic hole scavenger for two actual brines provided a NO₃^- reduction of almost 95 %. The optimized CT sample on the surface of GAC was still stable and active after seven cycles with 18.02 US$/ m³ operating cost.</div></div>","PeriodicalId":73763,"journal":{"name":"Journal of hazardous materials advances","volume":"20 ","pages":"Article 100885"},"PeriodicalIF":7.7,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145096908","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":"Heavy metal pollution in the sundarbans mangrove ecosystem: a growing environmental concern","authors":"Arnob Ghosh ,&nbsp;Md. Kamal Hossain ,&nbsp;Kowshik Das Karmaker ,&nbsp;Md. Zuel Rana ,&nbsp;Md. Jobaer Alam ,&nbsp;Abu Hena Muhammad Yousuf ,&nbsp;Shamiha Shafinaz Shreya ,&nbsp;Mahfujur Rahman ,&nbsp;Afsana Hamid ,&nbsp;Afroza Parvin ,&nbsp;Mohammad Moniruzzaman ,&nbsp;Mohammad Abdul Momin Siddique ,&nbsp;Mahmudul Hasan","doi":"10.1016/j.hazadv.2025.100887","DOIUrl":"10.1016/j.hazadv.2025.100887","url":null,"abstract":"<div><div>The Sundarbans, the world's largest mangrove forest, hosts a diverse ecosystem with numerous plant and wildlife species. Nevertheless, this vibrant ecosystem is facing a severe threat from heavy metal pollution. To address the ecological and socioeconomic importance of the study area, this research investigated the dynamics of nine trace metals: arsenic (As), cadmium (Cd), chromium (Cr), copper (Cu), mercury (Hg), manganese (Mn), nickel (Ni), lead (Pb), and zinc (Zn) in water and sediment samples. The water and sediment samples were collected from 12 distinct sites in Sundarbans in the pre-monsoon, post-monsoon, and winter seasons. Seasonal and spatial patterns highlighted the concentration fluctuation, which was attributed to contamination levels, and identified the hotspot of the metals. The study found higher levels of As and Hg in all sites across all seasons in the water samples. The highest concentration of water was observed in the Pasur River during the pre-monsoon season. Seasonal dynamics also indicated that pre- and post-monsoon seasons are the most critical for ecosystem vulnerability. The contamination levels indicated by pollution indices such as the Degree of Contamination (C_d), Heavy Metal Pollution Index (HPI), Nemerow Pollution Index (NPI), Geo-accumulation Index (I_geo), and Pollution Load Index (PLI) show that the water is significantly polluted, predominantly by As and Hg. Ecological risk evaluation indicated more ecological risks in water than in sediment. The combined statistical analysis, including Principal Component Analysis (PCA), Hierarchical Cluster analysis (HCA), and Correlation Analysis, identified the prime sources of heavy metals in the water and sediment samples that are mixed geogenic–anthropogenic origins with seasonal variation. Industrial discharge, agriculture and port-related activities were identified as key anthropogenic sources, whereas natural weathering and sediment transport were also significant contributors of metals. The results of the study offer a broad overview of the present heavy metal configuration in water and sediment, which can be regarded as a benchmark for future monitoring programs. Policy frameworks may integrate the findings to adopt an effective mitigation policy to achieve conservation goals of the Sundarbans Mangrove.</div></div>","PeriodicalId":73763,"journal":{"name":"Journal of hazardous materials advances","volume":"20 ","pages":"Article 100887"},"PeriodicalIF":7.7,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145096910","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":"Terahertz PCF sensor for explosive detection: A machine learning approach to nitroglycerine and royal demolition analysis","authors":"A.H.M. Iftekharul Ferdous ,&nbsp;Md. Safiul Islam ,&nbsp;Abdullah Al Mamun ,&nbsp;Md. Hanif Reza ,&nbsp;Md. Jakir Hossen ,&nbsp;Md. Shamim Anower","doi":"10.1016/j.hazadv.2025.100886","DOIUrl":"10.1016/j.hazadv.2025.100886","url":null,"abstract":"<div><div>This article presents a square hollow core Photonic Crystal Fiber (PCF) sensor developed for high relative sensitivity detection of explosives (Nitroglycerin and Royal Demolition Explosive (RDX)) in the terahertz region (1 THz to 2.8 THz). The numerical sensing capabilities are assessed utilizing the finite element technique(FEM). We have attained enhanced relative sensitivity with negligible loss for detecting Nitroglycerine and RDX through the optimization of structural factors. The maximum relative sensitivity achieved is 98.09 % for Nitroglycerine and 88.25 % for RDX at 2 THz. Additionally, we have achieved little effective material loss (EML) and an extensive effective area. The proposed sensor design is compatible with current fabrication technologies, ensuring practical feasibility. Furthermore, the prediction was conducted with the Random Forest Regressor. We have attained optimal accuracy of prediction with a unity R² score, and this model may be utilized for predicting much behaviour, including relative sensitivity and EML for frequency.</div></div>","PeriodicalId":73763,"journal":{"name":"Journal of hazardous materials advances","volume":"20 ","pages":"Article 100886"},"PeriodicalIF":7.7,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145109724","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":"Plastic waste in the East African Community (EAC): status, discharge, contamination, and mitigation strategies","authors":"Habasi Patrick Manzi ,&nbsp;Stanislas Nsanzamahoro ,&nbsp;Théogène Habumugisha ,&nbsp;Jean Yves Uwamungu","doi":"10.1016/j.hazadv.2025.100881","DOIUrl":"10.1016/j.hazadv.2025.100881","url":null,"abstract":"<div><div>The East African Community (EAC) is a regional intergovernmental organization comprising seven partner states: Burundi, the Democratic Republic of Congo, Kenya, Rwanda, South Sudan, Tanzania, and Uganda. EAC has a rapid urbanization, population growth, and increasing plastic consumption. Despite policy efforts and bans on single-use plastics in some member states, inadequate waste management and limited recycling initiatives hinder effective plastic waste reduction. Although plastic waste and microplastics pose significant pose significant concerning risks, there is currently no comprehensive review detailing their prevalence, mitigation strategies, and health impact within EAC. This review explores the status and gaps regarding plastic waste in EAC countries, its discharge to the ocean, and microplastic contamination in EAC water bodies. It highlights the existing mitigation strategies to address plastic waste. Furthermore, suggestions for controlling and mitigating plastic waste are delineated, outlining both conceptual aspects and practical approaches. Strengthening regional cooperation, improving waste management systems, and promoting sustainable alternatives are crucial for tackling plastic waste. Through educational outreach and campaigns, coupled with the development of non-toxic plastic alternatives and the implementation of effective disposal or recycling strategies, can yield numerous advantages for the use of plastic materials in everyday human life, given their affordability and versatility. Further investigations are needed to detect microplastics and nanoplastics in water bodies across the EAC, as existing research remains limited.</div></div>","PeriodicalId":73763,"journal":{"name":"Journal of hazardous materials advances","volume":"20 ","pages":"Article 100881"},"PeriodicalIF":7.7,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145096912","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":"Nitrogen-containing heterocyclic structure-toxicity reliant mechanism based EC50 toxicity prediction models for carbamazepine’s transformation products","authors":"Haoran Wang ,&nbsp;Junzhe Dai ,&nbsp;Sikun Liu ,&nbsp;Xiaohan Huang ,&nbsp;Zhihao Xie ,&nbsp;Zujian Wu ,&nbsp;Tianchi Liang ,&nbsp;Gang Lu","doi":"10.1016/j.hazadv.2025.100882","DOIUrl":"10.1016/j.hazadv.2025.100882","url":null,"abstract":"<div><div>Carbamazepine (CBZ) and its transformation products (TPs) were frequently detected in aquatic environments, and their long-term presence was linked to microbial antibiotic resistance and global health risks. In this study, we developed high-precision regression and classification models to predict the toxicity of CBZ's TPs, using bioassay data from <em>Vibrio fischeri</em> EC₅₀ values. The models were trained on experimentally determined toxicity data of 38 nitrogen-containing heterocyclic compounds (NHCs) and validated using 11 CBZ's TPs as an external validation set. Eight machine learning models were used to train regression models, and six were used to train classification models. To address overfitting due to the limited dataset size, variational autoencoder (VAE) based data augmentation expanded the training dataset from 38 to 200 samples. Among the machine learning models trained, Support vector regression (SVR) and Gradient boosting machines (GBM) were identified as the optimal regression and classification models, respectively. Additionally, Shapley additive explanations (SHAP) analysis was employed to identify the key molecular features contributing to toxicity, highlighting the critical roles of heterocyclic structures, topological properties, and nitrogen atom characteristics of TPs in determining their toxicity. It proved NHCs similar structure-based nitrogen heterocyclic structure training model present robust. This work provided a reliable framework for assessing the toxicity of CBZ's TPs in environmental monitoring and ecotoxicity risk assessment.</div></div>","PeriodicalId":73763,"journal":{"name":"Journal of hazardous materials advances","volume":"20 ","pages":"Article 100882"},"PeriodicalIF":7.7,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145020084","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":"Combined toxicity of salinity, antiscalants, and coagulants in the sentinel kelp Lessonia berteroana: Implications for marine biomonitoring near desalination discharges","authors":"Edgardo Cruces ,&nbsp;Fernanda Rojas-Cepeda ,&nbsp;Yesenia Rojas-Lillo ,&nbsp;Estefanía Bonnail ,&nbsp;Marcela Gaete-Fritz ,&nbsp;Graciela Pérez-Mora ,&nbsp;Víctor Cubillos ,&nbsp;Jaime Montory ,&nbsp;François Perreault","doi":"10.1016/j.hazadv.2025.100879","DOIUrl":"10.1016/j.hazadv.2025.100879","url":null,"abstract":"<div><div>Desalination is increasingly used to produce potable water in arid coastal regions. However, this process generates hypersaline effluents (brines) that are discharged into marine environments, potentially affecting aquatic ecosystems. Since the ecological impact of brines depends on receiving environment characteristics, there is a growing need for sensitive biomonitoring tools.</div><div>The present study assessed the physiological and biochemical responses of <em>Lessonia berteroana</em>, a brown macroalgae endemic to the north-central coast of Chile, to salinity gradients and contaminants commonly associated with desalination processes. Laboratory exposure experiments evaluated stress responses using photosynthetic performance, pigment content, dehydration rate, total phenolic compounds, and lipid peroxidation as biomarkers. Tolerance thresholds were determined through 96-hour EC₅₀ dose-response models.</div><div>The results identified salinity as the primary stressor for L. <em>berteroana</em>, with optimal physiological performance maintained at salinity increases of ≤15 % (∼38.4 practical salinity units (PSU) and a tolerance threshold approaching 51 PSU. The phosphonate-based antiscalant further reduced tolerance to 44.9 PSU, while combined exposure to brine, antiscalant, and coagulant lowered the threshold to 44.5 PSU. Among all biomarkers, lipid peroxidation exhibited the highest sensitivity, highlighting oxidative stress as a key physiological response mechanism.</div><div>These findings highlight the susceptibility of <em>L. berteroana</em> to brine discharges, particularly in the presence of chemical additives, and support its use as a sentinel species for detecting early-stage environmental impacts from desalination activities.</div></div>","PeriodicalId":73763,"journal":{"name":"Journal of hazardous materials advances","volume":"20 ","pages":"Article 100879"},"PeriodicalIF":7.7,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145050141","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":"Bioaccumulation pattern of per- and polyfluoroalkyl substances (PFAS) in fish tissues from two freshwater systems","authors":"Margaret D. Taiwo ,&nbsp;Husam Kafeenah ,&nbsp;David D. Duvernell ,&nbsp;Michael O. Eze","doi":"10.1016/j.hazadv.2025.100875","DOIUrl":"10.1016/j.hazadv.2025.100875","url":null,"abstract":"<div><div>Per- and polyfluoroalkyl substances (PFAS) are known for their persistence, ubiquity, bioaccumulation in different matrices of the environment and their detrimental effect on human health. In this study, we used EPA 1633 to examine the prevalence of ten PFAS compounds in two freshwater systems and investigated their bioaccumulation pattern across different tissues of grass carp fish (<em>Ctenopharyngodon idella</em>), common carp (<em>Cyprinus carpio</em>), and flathead catfish (<em>Pylodictis olivaris</em>). Among the PFAS compounds analyzed, PFBS exhibited the highest concentration in the freshwater sample, exceeding the U.S. EPA regulatory limit of 4 ng/L for drinking water. The total PFAS concentrations in the muscle, kidney, and liver of each species are 2749.83 ng/kg, 5180.41 ng/kg, and 5815.79 ng/kg respectively for grass carp; 4081.04 ng/kg, 18,890.92 ng/kg, and 8210.76 ng/kg for common carp. Catfish had the highest concentrations at 16,826.79 ng/kg, 82,035.73 ng/kg, and 114,788.91 ng/kg for muscle, kidney and liver, respectively, which is consistent with them being a tertiary consumer. Overall, short-chain PFAS were more prevalent in the water samples, while the long chain sulphonic acids, specifically PFOS, were highly concentrated in the fish tissues. Given that ingestion via human consumption of aquatic organisms is one of the main entry routes of PFAS, this study provides insights into species-specific and tissue-specific PFAS accumulation in aquatic animals. The findings of this study further underscore the need for ongoing monitoring and risk assessment of PFAS in aquatic environments and food products.</div></div>","PeriodicalId":73763,"journal":{"name":"Journal of hazardous materials advances","volume":"20 ","pages":"Article 100875"},"PeriodicalIF":7.7,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145020145","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":"Integrated electrochemical and spectroscopic assessment of heavy metal bioaccumulation in mangrove plants: A sustainable strategy for environmental monitoring and risk mitigation","authors":"Shamsa Alotaibi ,&nbsp;Abdelaziz Elgamouz ,&nbsp;Abdel-Nasser Kawde ,&nbsp;Kareem A. Mosa ,&nbsp;Saad BenHaiba ,&nbsp;Soukaina El Abbadi","doi":"10.1016/j.hazadv.2025.100878","DOIUrl":"10.1016/j.hazadv.2025.100878","url":null,"abstract":"<div><div>Mangrove forests play a vital role in coastal protection, biodiversity, and pollution mitigation, but they are increasingly threatened by heavy metal uptake associated with industrialization. However, real-time, in-situ, and non-destructive methods for monitoring metal bioavailability within mangrove plants remain unavailable. This study develops and tests an acupuncture Needle Electrode modified with reduced graphene oxide and bismuth nanoparticles (ANE/rGO/BiNPs) for real-time heavy metal detection in Alhamriyah Mangrove Reserve (AHMR). To establish baseline contamination levels for a range of elements, water and sediment samples were collected from three sites within the reserve and analyzed using inductively coupled plasma optical emission spectrometry (ICP-OES). The chemical oxygen demand (COD) was high (&gt; 11.0 mg/L), and the sludge was quite polluted with Cd, In, Ag, and Bi as the contamination factor (C_f &gt; 10). Analysis of a mature mangrove tree showed highest metal accumulation in roots, with contamination factors: In (870.460) &gt; Ag (636.386) &gt; Cd (416.588) &gt; Bi (248.918) &gt; Tl (93.144), suggesting industrial sources and highlight the need for monitoring non-traditional metals like Cd. Mangrove seedlings were irrigated with varying levels of Cd, Pb, and Zn, showing dose-dependent metal accumulation. Roots primarily accumulated Cd and Pb, indicating phytostabilization potential, while Zn's higher mobility suggests suitability for phytoextraction. The ANE/rGO/BiNPs sensor was inserted into living mangrove tissues to detect metal uptake using Square Wave Voltammetry (SWV). After four weeks, electrochemical readings showed high accumulation levels (Cd: 5182.29 µM, Pb: 5076.25 µM, Zn: 41,998.50 µM) under high treatment. Compared to much lower ICP-OES values (Cd &lt; 150, Zn &lt; 3, Pb &lt; 5), electrochemical contamination factors were significantly higher, demonstrating the sensor’s superior sensitivity and effectiveness for non-destructive, real-time monitoring of bioavailable metal uptake in mangroves. This novel approach highlights the potential of needle-based sensors as practical tools for in-situ biomonitoring and environmental risk assessment in vulnerable coastal ecosystems.</div></div>","PeriodicalId":73763,"journal":{"name":"Journal of hazardous materials advances","volume":"20 ","pages":"Article 100878"},"PeriodicalIF":7.7,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145020083","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":"A methodological approach to assess the release of metals from metallic- and electronic-wastes exposed to rainfall events in waste collection centers","authors":"Vanessa Canaletti,&nbsp;Alessandro Bonetto,&nbsp;Andrea Brunelli,&nbsp;Elena Semenzin,&nbsp;Loris Calgaro,&nbsp;Cinzia Bettiol,&nbsp;Antonio Marcomini,&nbsp;Elena Badetti","doi":"10.1016/j.hazadv.2025.100877","DOIUrl":"10.1016/j.hazadv.2025.100877","url":null,"abstract":"<div><div>The disposal of metallic (MW) and electronic (E-W) waste, if not properly accomplished, can lead to the release of toxic metals to soil and surface water, posing risks to environmental health. The extent of metal leaching depends on waste management practices, including storage conditions. Facing this issue, we developed a methodological approach combining field and laboratory investigations to support management strategies in collection centers where wastes are stored in open-top containers and thus exposed to rainfall.</div><div>Specifically, leachate samples were collected after rainfall events at several centers and analysed. To account for variability observed in field conditions, a laboratory-scale experiment was also set up, with MW and EW exposed to simulated rainfall events, including a 15-minute first flush, followed by further 15 min, with waste immersion up to 14 days in water accumulated in the containers (later stage). Periodical leachate analysis revealed that, despite a higher release of certain metals from MW (up to 13.4, 10.9 and 47.9 mg/L for aluminium, iron, and zinc, respectively), E-W posed greater concern due to a significant release of hazardous metals such as cadmium, nickel and lead (up to 0.5, 0.3 and 1.7 mg/L, respectively). Different release patterns between waste types were observed, particularly during the first flush. Water accumulated during the later stage showed increasing or peak concentrations of hazardous metals, stressing the influence of prolonged immersion. These findings highlighted critical factors in waste management to mitigate environmental impact, including storage time and monitoring/treatment of the resulting wastewater before discharge into the environment.</div></div>","PeriodicalId":73763,"journal":{"name":"Journal of hazardous materials advances","volume":"20 ","pages":"Article 100877"},"PeriodicalIF":7.7,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145050140","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":"Ternary Fe-Zn-Al layered double-hydroxides for interactive removal of cd and pb from aqueous solutions: Isotherms, kinetics and application to real samples","authors":"Ramatsobane Rosy Phogole ,&nbsp;Philani Perfect Mpungose ,&nbsp;Luthando Nyaba ,&nbsp;Mthokozisi Mnguni ,&nbsp;Philiswa Nosizo Nomngongo","doi":"10.1016/j.hazadv.2025.100876","DOIUrl":"10.1016/j.hazadv.2025.100876","url":null,"abstract":"<div><div>The ongoing influx of trace elements in our water systems from industrial wastewater poses a need for water decontamination. In this study, Fe-Zn-Al LDH was synthesised via the co-precipitation method as an adsorbent in the decontamination of Cd and Pb from surface and groundwater. The synthetic technique was used because it is simple and effective. The synthesised Fe-Zn-Al LDH was characterised by instruments including X-ray powder diffraction (P-XRD), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope-energy dispersive spectroscopy (SEM-EDS). The FTIR showed that the dominant characteristic groups of Fe-Zn-Al LDH were O<img>H, CO₃^2-, NO₃^-, M-O and M-O-M, which are the expected functional groups. The SEM-EDS confirmed the elemental composition of the material, and XRD also confirmed the lamellar structure of Fe-Zn-Al LDH by having characteristic peaks of LDH. Under optimum conditions, adsorption kinetics and equilibrium studies were conducted to investigate possible adsorption mechanisms involved during the removal process. The kinetics data fitted the Elovich and pseudo-second-order models, with the relatively highest correlation coefficient for both analytes compared to the pseudo-first-order model. It was also observed that the Langmuir and the Freundlich models show the best agreement with adsorption equilibrium data. The maximum adsorption capacities for Cd and Pb were calculated using the Langmuir model equation and were 11.9 and 280 mg/g. Moreover, because of its high adsorption affinity and fast adsorption kinetics, the Fe-Zn-Al LDH proved to be a suitable adsorbent material for Cd and Pb removal from water samples, with removal efficiencies ranging from 80–98 %.</div></div>","PeriodicalId":73763,"journal":{"name":"Journal of hazardous materials advances","volume":"20 ","pages":"Article 100876"},"PeriodicalIF":7.7,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145020146","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}