环境•农林最新文献

{"title":"Polymer–iron oxide nanofiber composites for lead removal: performance improvements through organic acid stabilization of nanoparticles to promote surface segregation during electrospinning","authors":"Sewoon Kim, Yun Young Choi, Chang Min Park, Nosang V. Myung, David M. Cwiertny","doi":"10.1039/d4en00902a","DOIUrl":"https://doi.org/10.1039/d4en00902a","url":null,"abstract":"Herein we developed nanofiber composite membranes made of polyacrylonitrile (PAN) and iron oxide nanoparticles using a one-pot electrospinning synthesis method for application in point-of-use (POU) water treatment devices targeting both dissolved and particulate lead. With the goal of optimizing lead removal while minimizing raw material costs, we explored different commercially available iron oxides and incorporated simple organic acids (OAs) [<em>e.g.</em>, <em>ortho</em>- and tera-phthalic acid (PTA and TPTA) and ethylenediaminetetraacetic acid (EDTA)] based on our previous observation that sodium dodecyl sulfate (SDS) promotes enrichment of iron oxide at the electrospun nanofiber surface (<em>i.e.</em>, surface segregation). From sorption isotherm studies, we found that increasing iron oxide loading led to higher lead uptake (<em>e.g.</em>, PAN with 5 wt% iron oxide exhibited a lead removal capacity of 10 mg g<small>⁻¹</small> of mat <em>versus</em> 5 mg g<small>⁻¹</small> for 1 wt% iron oxide). PAN with 5 wt% iron oxide (3.3 mg lead removal per $) also resulted in better cost-normalized lead removal than PAN with 1 wt% iron oxide (1.0 mg lead removal per $). The integration of OAs further improved performance; for example, PAN with 5 wt% iron oxide and 3 wt% PTA achieved approximately 40 mg g<small>⁻¹</small>. From nanofiber characterization <em>via</em> microscopic (SEM and TEM) and spectroscopic (XPS and FTIR) tools, OAs increase lead uptake through a combination of pathways: (1) stabilizing iron oxide particles and improving their dispersion in electrospinning sol gels; (2) promoting surface segregation that increases iron oxide concentration at the nanofiber surface; (3) functioning as a porogen that increases composite surface area; and (4) introducing some additional lead binding sites (<em>e.g.</em>, carboxylates) within the nanofiber. Simulating point-of-use application in a dead-end filtration system (effective filter area of 12.6 cm<small>²</small>, filter thickness of 120 μm, and flow rate of 20 mL min<small>⁻¹</small>), we observed lead-free permeate with just 0.24 g of our optimal formulation when challenged with 4 L of 150 μg L<small>⁻¹</small> soluble lead solution and 90% removal when this filter was challenged with a feed solution containing both dissolved and particulate lead (160 μg L<small>⁻¹</small> total lead with 30% of particulate lead; &gt;0.1 μm). Our study highlights the potential for OAs to enhance the performance of polymer–metal oxide nanofiber composites <em>via</em> a one-pot synthesis that will help to minimize production costs for high-performing materials.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"32 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142879850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Concentration Characteristics and Wavelet Analysis of Ambient NH3 in Kitakyushu, Japan over the Period of 2018–2022","authors":"Xi Zhang,&nbsp;Duy Anh Tran,&nbsp;Duy Van Nguyen,&nbsp;Hiroshi Sato,&nbsp;Yuko Eto,&nbsp;Masahide Aikawa","doi":"10.1007/s11270-024-07709-x","DOIUrl":"10.1007/s11270-024-07709-x","url":null,"abstract":"<div><p>The concentration of ambient ammonia gas (NH₃(g)) in Kitakyushu, Japan was determined by a passive method for four years, with a mean value of 4.7 ppb. On a weekly basis, the NH₃(g) concentration fluctuated greatly; however, by applying a low-pass filter of 1 Hz/yr, a common feature in seasonal variation, a relative maximum for one year appeared in late spring to summer, and a relative minimum appeared in late autumn to winter. The two outliers with high NH₃(g) concentrations (16.5, 10.5 ppb) were observed in July and September in the second year, 2019. By using the backward trajectory analysis as well as comparing with other air pollutants from the viewpoint of time series and correlation coefficient, the high NH₃(g) concentration was considered to be due mainly to local meteorology and emissions. Five cases in which the NH₃(g) concentration was N.D. (not detected) reflected the low level in actual atmospheric condition; the PM_2.5 concentration also decreased synchronously during corresponding period. Comprehensively taking into account not only the large fluctuation but also the evaluation of high and low NH₃(g) concentrations, a statistically significant increasing trend of ca. 0.24 ppb/yr, providing an increasing rate of ca. 5.1%/yr during the study period which was comparable to the studies by satellite data analyses, was clarified. Wavelet analysis further showed three oscillation periods in NH₃(g) concentration on the scales of 30–50 weeks (w), 60–80 w, and 85–128 w. Moreover, the strongest oscillation occurred at 111 w with the variance of 3990, and three down-up conversions for the real part of wavelet coefficients were found, providing an overall cognition of NH₃(g) concentration variation to predict further changes.</p></div>","PeriodicalId":808,"journal":{"name":"Water, Air, & Soil Pollution","volume":"236 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of Cellulose Acetate-Polyethylene Glycol-Chitosan Membrane-Embedded TiO2 Nanoparticles for Reverse Osmosis Desalination","authors":"Faizal Mustapa,&nbsp;Selvia Laki Wawe,&nbsp;La Ode Ahmad,&nbsp;Dwiprayogo Wibowo,&nbsp;Amir Mahmud,&nbsp;Maulidiyah Maulidiyah,&nbsp;Akrajas Ali Umar,&nbsp;Muhammad Nurdin","doi":"10.1007/s11270-024-07693-2","DOIUrl":"10.1007/s11270-024-07693-2","url":null,"abstract":"<div><p>The clean water crisis in Indonesia has recently increased due to wastewater pollution in groundwater. As an alternative, the use of seawater for clean water needs to be developed, considering that Indonesia has a very abundant area of sea water which is an alternative as a raw material for clean water resources. In this study, we fabricated TiO₂ nanoparticles (NPs) embedded in CA/PEG/Chitosan membranes for seawater desalination. The effect of TiO₂ NPs for high-performance of developed membranes was evaluated by reverse osmosis (RO) method to determine the unique characteristics and performance of membranes material for evaluating seawater desalination process. Preparation of CA/PEG/Chitosan membrane-embedded TiO₂ NPs was evenly dispersed into the CA/PEG/Chitosan membrane interlayer by blending method and printed on a glass surface to obtain a thin film developed membranes. The characterization and performance over developed membranes were evaluated to observe unique characteristic by adding TiO₂ NPs and its high-performance to reject salt content in seawater. Based on these results, the developed membranes were interestingly characterized by using FTIR spectrophotometer shows the presence of functional groups for organic and inorganic bonds such as C = O, -CH₃, NH₂, C-O, -OH, C-H, and Ti–O-Ti. The presence of TiO₂ NPs indicates the attachment of TiO₂ NPs in the membranes. In addition, a scanning electron microscope (SEM) was also confirmed to evaluate the morphological structure of without and CA/PEG/Chitosan-modified TiO₂ type (I) and (II), in which the pore size of CA/PEG/Chitosan is larger than membrane-embedded TiO₂ NPs. Moreover, XRD analysis also confirmed that TiO₂ NPs has shown amorphously structures formed on CA/PEG/Chitosan membrane, in which the TiO₂ NPs crystal size with 0.25 g of 2.87 nm and 0.5 g of 3.05 nm. Determination of seawater desalination and water flux has shown Ca/PEG/Chitosan membrane-modified TiO₂ NPs can increase salt rejection value but reduce membrane water flux value. The highest flux value is 29.4 L/m indicates by CA/PEG/Chitosan membrane, while the salt rejection value is 61.76% from CA/PEG/Chitosan membrane-embedded 0.5 g TiO₂ NPs. This study provides a new idea for preparing highly permeable and seawater desalination membranes of CA/PEG/Chitosan membrane-embedded TiO₂ NPs under the reverse osmosis method for producing clean water resources.</p></div>","PeriodicalId":808,"journal":{"name":"Water, Air, & Soil Pollution","volume":"236 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An Improved method to generate secondary nanoplastics and oligomers: Application in ecotoxicology","authors":"Silvia Gomez-Kong, Miguel Tamayo Belda, Gerardo Pulido-Reyes, Carlos Edo, Irene Verdú, Francisco Leganes, Roberto Rosal, Miguel González-Pleiter, Francisca Fernandez-Piñas","doi":"10.1039/d4en00866a","DOIUrl":"https://doi.org/10.1039/d4en00866a","url":null,"abstract":"Recent studies have highlighted the ecotoxicological effects of conventional primary nanoplastics (NPLs), however, the impacts of secondary NPLs and oligomers (Olig), especially those derived from biodegradable plastics, formed through fragmentation and natural degradation processes (e.g., photooxidation) remain underexplored. This gap is partly due to challenges in producing sufficient quantities for toxicity testing. An improved method to generate non-photooxidized (NP) and photooxidized (P) secondary NPLs and Olig from polybutylene adipate co-terephthalate (PBAT), a biodegradable plastic commonly used in agriculture mulching, that involves the mechanical breakdown of PBAT-microbeads with or without prior photooxidation is presented. PBAT was irradiated at ~ 9.34 kW m−2 (approximately 120 times the solar irradiance) during 96 h, irradiation that corresponds to ~ 16 months of average sunlight in the Iberian Peninsula (7.7 kWh m−2 day−1). The toxicological effects on Chlamydomonas reinhardtii, a model green microalga of primary producers in freshwater ecosystems was also assessed. The protocol yielded 0.199 mg of secondary NP-PBAT-NPLs and 10.275 mg of NP-PBAT-Olig per gram of PBAT-microbeads. PBAT-NPLs presented irregular spherical morphologies and hydrodynamic sizes ranging from 56.71 to 69.86 nm. HPLC and MALDI-TOF analysis identified linear and cyclic Olig, ranging from dimers to 19 repeated-units Olig. PBAT-NPLs and PBAT-Olig exhibited negative surface charges, suggesting colloidal stability in water. While PBAT-NPLs and PBAT-Olig did not inhibit algal growth in the short-term, they induced reactive oxygen species overproduction at the environmentally relevant concentrations of 0.01 mg/L, and caused membrane depolarization, impaired photosynthesis and lipid peroxidation at 10 mg/L. Non-photooxidized PBAT-NPLs exhibited the highest toxicity, followed by photooxidized PBAT-NPLs and both non-photooxidized and photooxidized PBAT-Olig. This study provides an efficient method for producing reference secondary NPLs and Olig and underscores the potential risks of PBAT towards primary producers in freshwater ecosystems.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"37 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Waste Valorisation and Contribution to the Circular Economy: The Evaluation of Water Treatment Sludge as a Phosphorus Adsorption Material and its Potential for Agricultural Reuse","authors":"Marcio Yukihiro Kohatsu,&nbsp;Maria do Carmo Calijuri,&nbsp;Renato Zimiani de Paula,&nbsp;Camila Clementina Arantes,&nbsp;Camila Neves Lange,&nbsp;Mariana Neves Ribeiro,&nbsp;Kayllane da Silva Novais,&nbsp;Julia de Morais Alves,&nbsp;Alessandro Lamarca Urzedo,&nbsp;Tatiane Araujo de Jesus","doi":"10.1007/s11270-024-07699-w","DOIUrl":"10.1007/s11270-024-07699-w","url":null,"abstract":"<div><p>Aluminium-based coagulants are extensively used in water treatment, producing significant quantities of waste sludge (WTS), that poses challenges for landfill disposal. Eutrophication, mainly driven by phosphorus (P) enrichment from wastewater, remains a critical environmental concern in aquatic ecosystems. WTS contains substantial amounts of aluminium (Al), which exhibits a high affinity for phosphate. This study aimed to assess the phosphorus adsorption capacity (qmax) of WTS and its potential for agricultural use. The WTS samples were characterized using various analytical techniques. Kinetic and isothermal experiments were conducted using dried (105 °C) and calcined (650 °C) WTS samples. Characterization revealed crystallinity differences between dried WTS and calcined WTS Kinetic tests, indicating equilibrium times of 16 h for dried WTS and 1 h for calcined WTS. Isothermal tests showed maximum adsorption capacity values at pH 7 of 13.81 mgP g⁻¹ for dried WTS and 52.03 mgP g⁻¹ for calcined WTS, highlighting the enhanced phosphorus removal efficiency of calcined WTS. Phytotoxicity assessments demonstrated that dried and calcined WTS promoted enhancements in germination and root elongation of <i>Lactuca sativa</i> of 20 and 10%, respectively, suggesting its potential agricultural benefit. Therefore, WTS demonstrates promise for tertiary wastewater treatment, contributing to a circular economy by potentially reclaiming phosphorus-rich compounds for agricultural reuse.</p></div>","PeriodicalId":808,"journal":{"name":"Water, Air, & Soil Pollution","volume":"236 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Individual identity of alarm calls in wild-living Brandt’s voles (Lasiopodomys brandtii)","authors":"Ilya A. Volodin,&nbsp;Vadim E. Kirilyuk,&nbsp;Nina A. Vasilieva,&nbsp;Elena V. Volodina","doi":"10.1007/s00114-024-01956-y","DOIUrl":"10.1007/s00114-024-01956-y","url":null,"abstract":"<div><p>We investigated acoustic variation responsible for the individuality of alarm calls produced by 50 Brandt’s voles <i>Lasiopodomys brandtii</i> derived from 50 different wild-living colonies. For the first time, we described the calling pattern of Brandt’s voles, producing a long series of short alarm calls with short inter-call intervals. The alarm calls displayed four different contours of fundamental frequency but were nevertheless strongly individually distinct within a series of 50 successive alarm calls per caller (2500 analyzed alarm calls). The average value of correct assignment of alarm calls to individuals with discriminant function analysis was 15 times higher than the value expected by chance and was robust, not decreasing with cross-validation. We discuss that the highly individualistic alarm calls provide a basis for individual recognition of callers by colony members. At the same time, heterogeneity of call contours makes the long call series less monotonous, potentially preventing habituation and promoting alertness of conspecific call recipients.</p></div>","PeriodicalId":794,"journal":{"name":"The Science of Nature","volume":"112 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Importance of Quality of Groundwater Resources in Transboundary River with Emphasis on Hydro-geochemical Properties, Case study: Aras Transboundary River (Northern Iran)","authors":"Farhad Ghayurdoost,&nbsp;Nasim Zolfaghari Firouzsalari,&nbsp;Sara Nikmaram,&nbsp;Neda Gilani,&nbsp;Mojtaba Damadipour,&nbsp;Alper Baba,&nbsp;Mohammad Mosaferi","doi":"10.1007/s11270-024-07674-5","DOIUrl":"10.1007/s11270-024-07674-5","url":null,"abstract":"<div><p>The urban periphery and the villages around the river Aras are one of the most important agricultural areas in Iran. Against this background, the present study investigated the hydrochemistry of groundwater along the Aras River in Iran to assess the suitability of groundwater quality for agricultural irrigation. Water samples were taken from 34 groundwater sources in 2021 and 2022. The suitability of groundwater for irrigation was assessed using the sodium absorption ratio (SAR), residual sodium carbonate (RSC), magnesium absorption ratio (MAR), Kelly ratio (KR) and Wilcox classification. The Langelier Saturation Index (LSI) and the Ryznar Stability Index (RSI) were used to predict the corrosion and deposition behavior of the groundwater. The optical emission spectrometer with inductively coupled plasma was used to detect the heavy metals. Monte Carlo simulation was used to assess the non-carcinogenic and carcinogenic risks of these waters when used as drinking water. The average concentration of major ions follows for cations Na⁺˃ Ca²⁺˃ Mg²⁺˃ K⁺ and anions in both groups SO₄²⁻ &gt; HCO₃⁻ &gt; Cl⁻. The corrosion in all samples was found to have a low to considerable corrosion potential. The concentrations of the tested metals were within the range recommended by the WHO in most samples. In summary, it can be said that most of the groundwater sources in the area studied are appropriate for irrigation purposes. However, to reduce the risks associated with drinking, it is advisable to monitor water quality by locating sources of pollution and limiting the input of contaminants.</p></div>","PeriodicalId":808,"journal":{"name":"Water, Air, & Soil Pollution","volume":"236 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanistic insights into different types of typical VOC adsorption on monolayer MoS2 via first-principles approaches","authors":"Weina Zhao, Jinlong Wang, Chang Shen, Bufan Xie, Guiying Li, Taicheng An","doi":"10.1039/d4en00953c","DOIUrl":"https://doi.org/10.1039/d4en00953c","url":null,"abstract":"Volatile organic compounds (VOCs) in the atmosphere emitted from industrial activities are stirring concern due to the serious threats to human health and global environmental over the recent years. Among the available VOC abatement options, adsorption technology has emerged as an appealing candidate for VOC removal from the contaminated air, yet little is known about the variation in adsorption trends and the underlying adsorption mechanism for different types of VOC species. Herein, the adsorption of eight typical types of VOCs (C ≤ 8 atoms) emitted from the petrochemical industry was investigated by density functional theory (DFT) calculations at the electronic and atomic level on monolayer MoS2, including alkanes, alkenes, alkynes, alcohols, aldehydes, carboxylic acids, ketones and aromatic hydrocarbons. Our research aims to investigate the adsorption behaviors of various types of VOCs, including those with different carbon chain lengths within the same VOC category. It shows that the unique structural properties of MoS2 monolayer not only provide excellent adsorption capabilities but also exhibited distinct responses to the eight aforementioned VOC types. The adsorption energy of VOCs exhibits a distinct hierarchical order: alkanes &lt; aromatic hydrocarbons &lt; alkynes &lt; aldehydes &lt; ketones &lt; alkene &lt; alcohols&lt; carboxylic acids, with the adsorption energy spanning from -0.25 to -1.19 eV. For different VOC adsorption systems, the distance between the rightmost peak of the density of states (DOS) and the Fermi level ranges from -1.42 to -0.17 eV. Additionally, for a given type of VOCs, it was observed that an increase in the carbon chain length correlates with an increase in adsorption energy, while a predictive fitting curve was derived for the adsorption energy of VOCs, expressed as Eads/eV = -0.13X - 0.12 with X being the number of carbon atoms. Through a comprehensive analysis involving charge density differences, DOS and Mulliken charge analysis, we elucidated the underlying mechanisms that correlate adsorption energy with both the specific VOC species and the carbon chain length. Our research highlights the potential and feasibility of MoS2 as a promising candidate for selective VOC adsorption, while also providing a theoretical framework for the development of high-performance VOC adsorbents.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"234 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142857859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coagulation-Flocculation/Pyrolysis Integrated System for Dye-Laden Wastewater Treatment: A Techno-Economic and Sustainable Approach","authors":"Gelasius Gregory Msemwa,&nbsp;Mahmoud Nasr,&nbsp;Amal Abdelhaleem,&nbsp;Manabu Fujii,&nbsp;Mona G. Ibrahim","doi":"10.1007/s11270-024-07659-4","DOIUrl":"10.1007/s11270-024-07659-4","url":null,"abstract":"<div><p>While several studies have employed coagulation-flocculation (CF) for textile wastewater (TW) treatment, conventional process optimization techniques cause insufficient pollution reduction and large sludge volume generation that deteriorate the environmental matrix and elevate the system’s operating cost. To avoid these drawbacks, this study focuses on optimizing an integrated CF/pyrolysis process using artificial intelligence technique and response surface methodology (RSM) for the dual benefit of TW treatment and biochar production. In the CF experiment, water hyacinth (WH) was employed as a bio-coagulant material for TW treatment under different pH, coagulant dosage, mixing speed, and settling time levels. Under the optimum CF conditions yielded by RSM and artificial neural network (ANN) models (initial pH: 5.5 vs. 5.7, WH dosage: 3.76 g/L vs. 3.5 g/L, settling time: 116 min vs. 102 min, and slow mixing speed: 25 rpm vs. 23 rpm), incomparable removal efficiencies for dye (87.3% vs. 91.3%) and turbidity (93.4% vs. 98.2%) were obtained. These removal efficiencies dropped to 83.5% and 87.6%, respectively, for operating the CF process using unoptimized operating factors. The pyrolysis of post-coagulation sludge yielded a carbon-rich biochar material characterized by a porous structure and abundant cationic microelements. The integrated performance of the CF/pyrolysis scheme under ANN-based optimal conditions achieved a shorter payback period of 5.2 years compared to RSM (5.7 years) and unoptimized (7.9 years) conditions. Furthermore, the optimized scheme supported several sustainable development goals that complied with clean water, good health, and climate change mitigation.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":808,"journal":{"name":"Water, Air, & Soil Pollution","volume":"236 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11270-024-07659-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142858603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel route to synthesize Bi/β-Bi2O3@Carbon: Mechanism and performance for efficient degradation of organic pollutants","authors":"Xia Zhang, Yifang Zhang, Xitong Yang, Jiaxin Han, Guifen Zhu, Jing Fan","doi":"10.1039/d4en00973h","DOIUrl":"https://doi.org/10.1039/d4en00973h","url":null,"abstract":"Metastable β-Bi<small>₂</small>O<small>₃</small> exhibits high catalytic performance due to its suitable band gap, greater dielectric permittivity and conductivity. However, the difficultly in preparing β-Bi<small>₂</small>O<small>₃</small>and β-Bi<small>₂</small>O<small>₃</small> based materials is still a problem to be overcome. In this work, porous Bi/β-Bi<small>₂</small>O<small>₃</small>@Carbon photocatalysts were prepared for the first time by using atmosphere switching strategy during the post-cooling of metal-organic framework (MOF) pyrolysis. The crystal phase structure and composition of Bi/β-Bi<small>₂</small>O<small>₃</small>@Carbon could be easily adjusted by simply switching cooling atmosphere from N<small>₂</small> to air when cooled to different temperatures. The photocatalytic activities of the material were evaluated by degradation of emerging pollutant Fluorescent whitening agents (FWA) 351 under simulated solar light irradiation. It was observed that 10 mg/L FWA 351 was completely degraded within 4 h using the optimal photocatalyst. The mineralization efficiency reached 60% in 6 h. Active species trapping experiments confirmed that hole oxidation was responsible for the degradation of FWA 351. The increased activity was due to the improved visible light utilization resulted from reduced bandgap of Bi/β-Bi<small>₂</small>O<small>₃</small>@Carbon and surface plasmon resonance effect of bismuth metal, as well as the facilitated interfacial electron migration and charge carrier separation through multi-interface transfer paths. The proposed strategy provides new ideas for designing and synthesizing functional materials. The efficient degradation and mineralization of FWA 351 by Bi/β-Bi<small>₂</small>O<small>₃</small>@Carbon also confirmed its potential for future application in wastewater treatment.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"19 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142849076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}