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Climate change in Africa: Impacts, adaptation, and policy responses
IF 8.6 1区 环境科学与生态学
Global Environmental Change Pub Date : 2024-12-01 DOI: 10.1016/j.gloenvcha.2024.102912
Lotsmart Fonjong , Frank Matose , David A. Sonnenfeld
{"title":"Climate change in Africa: Impacts, adaptation, and policy responses","authors":"Lotsmart Fonjong ,&nbsp;Frank Matose ,&nbsp;David A. Sonnenfeld","doi":"10.1016/j.gloenvcha.2024.102912","DOIUrl":"10.1016/j.gloenvcha.2024.102912","url":null,"abstract":"<div><div>African countries have been among the least historic producers of global carbon emissions, yet they are among the most vulnerable to and impacted by global climate change. Climate change is profoundly impacting African countries in a multitude of ways including exacerbating water stress, damaging agricultural harvests, affecting lifestyles, and amplifying gender and other dimensions of inequality. Beyond such direct impacts, socio-economic consequences of climate change are impacting governance on the continent, as well. With current levels of external debt, rapid urbanization, social inequality, and pressures on agricultural land, the number of people living in rural poverty and informal urban settlements continues to rise. Many of the latter, in turn, are in constant danger of floods, and lack access to sustainable livelihoods, potable water, adequate food, health care, electricity, sanitary and solid waste disposal, and other fundamental services. Climate change exacerbates internal and external human mobility across the continent; endangers families and communities; and threatens African ecologies, economies, and political stability. How are policymakers, practitioners, and other stakeholders responding and adapting to climate-related threats in Africa today? This Special Issue highlights the work of African scholars and others in examining and interrogating current trends, dynamics, policies, and developments in response to climate change in Africa. The seven papers utilize multiple levels of analysis, draw from various disciplinary perspectives, and examine climate change related accomplishments and challenges of diverse countries across the continent. While these contributions generally interrogate the policy response to the climate crisis, most are specific in their framing and analysis. This introduction characterizes the impact of climate change on Africa; highlights each article’s key contributions and discusses implications of their findings in the context of electoral dynamics and climate policy discourse in Africa; and discusses some possible future directions for scholarship and policymaking on climate change in Africa.</div></div>","PeriodicalId":328,"journal":{"name":"Global Environmental Change","volume":"89 ","pages":"Article 102912"},"PeriodicalIF":8.6,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
引用次数: 0
Desalination Plant Brine Pollution Suppresses Early Mangrove Growth: A Call for Environmental Management
IF 3.8 4区 环境科学与生态学
Water, Air, & Soil Pollution Pub Date : 2024-11-30 DOI: 10.1007/s11270-024-07658-5
Maryam Moslehi Jouybari, Sina Behrouzi Khorgou, Hossien Parvaresh, Azhir Khalil Ariya, Tom Pypker, Mehrdad Zarafshar
{"title":"Desalination Plant Brine Pollution Suppresses Early Mangrove Growth: A Call for Environmental Management","authors":"Maryam Moslehi Jouybari,&nbsp;Sina Behrouzi Khorgou,&nbsp;Hossien Parvaresh,&nbsp;Azhir Khalil Ariya,&nbsp;Tom Pypker,&nbsp;Mehrdad Zarafshar","doi":"10.1007/s11270-024-07658-5","DOIUrl":"10.1007/s11270-024-07658-5","url":null,"abstract":"<div><p>This study delves into the intricate environmental ramifications of desalination brine on mangrove seedlings (<i>Avicennia marina</i> Forssk. Vierh), encompassing an extensive examination of plant growth, biomass allocation, soil salinity, leaf elemental composition, and plant biochemical reactions. Seedling propagules were collected from robust grey mangrove trees in Tiabe, Minab port, South of Iran, and planted in plastic pots in September 2020. Following irrigation twice daily, treatments with desalination brine concentrations (0%, 1%, 2%, 3%, 5%, 10%, and 20%) were applied for 6 months. The results reveal that seedling height and diameter remain stable up to 3% brine but exhibit declines at higher concentrations. Leaf area remains unaffected at 1–3% brine but experiences a significant decrease beyond 5%. Seedling vitality sharply declines at 1%, intensifying up to 10%, with the most profound reduction at 20% brine concentration. Biomass allocation in roots, shoots and leaves demonstrates nuanced responses, with soil salinity increasing significantly, particularly at the highest brine concentration of 20%. Sodium and chloride concentrations exhibit tissue-specific variations, and a positive correlation is observed between cadmium concentrations and brine intensity. The study underscores a pollution-induced stress on photosynthetic pigments. Enzyme activities (CAT, POD, SOD) show an escalating trend with brine, peaking at 20%, emphasizing the intricate environmental implications of desalination brine on coastal ecosystems. The findings advocate for sustainable management practices in coastal ecosystems facing anthropogenic stressors.</p></div>","PeriodicalId":808,"journal":{"name":"Water, Air, & Soil Pollution","volume":"236 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142754337","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}
引用次数: 0
High Selectivity of CO2 Capture with Single- and Double-Walled Carbon Nanotubes
IF 8.131 2区 环境科学与生态学
Environmental Science: Nano Pub Date : 2024-11-29 DOI: 10.1039/d4en00496e
Winarto Winarto, Lilis Yuliati, Purnami Purnami, Paul E. Brumby, Kenji Yasuoka
{"title":"High Selectivity of CO2 Capture with Single- and Double-Walled Carbon Nanotubes","authors":"Winarto Winarto, Lilis Yuliati, Purnami Purnami, Paul E. Brumby, Kenji Yasuoka","doi":"10.1039/d4en00496e","DOIUrl":"https://doi.org/10.1039/d4en00496e","url":null,"abstract":"An excessive concentration of greenhouse gases, most significantly carbon dioxide (CO2), in the atmosphere has led to the serious environmental issue of global warming. Carbon capture is a suitable strategy to reduce the increase of CO2 in the atmosphere due to fossil fuel combustion. Innovative technologies for CO2 capture are urgently required and this is an area of intensive study in order to improve efficiency and reduce operational costs. In this work, we applied molecular dynamics simulations to demonstrate the ability of single–walled carbon nanotubes (SWCNT) and double–walled carbon nanotubes (DWCNT) to capture CO2 from flue gases. Both SWCNTs and DWCNTs prefer to adsorb CO2 rather than N2 and O2, resulting in a separation effect. CO2 molecules form a solid ice structure in the carbon nanotubes (CNT) while N2 and O2 remain gaseous. As a result, the potential energy of the CO2 structure inside the CNTs is lower than that of the N2 or O2 structures. This implies that CO2 is more stable in the CNTs. Therefore, the formation of these solid CO2 structures plays an important role in the process of capturing CO2 via CNTs. Moreover, the van der Waals interactions between CO2 molecules and the CNT walls make a significant contribution to the separation of CO2 as well. The potential energy of the CO2– CNT wall interactions is significantly lower than those of N2–CNT wall or O2–CNT wall interactions. In addition, the presence of a second wall in DWCNTs causes even stronger attractive CO2–CNT wall van der Waals interactions than those found in SWCNTs. As a result, the CO2 capturing effect of DWCNT is greater than that of SWCNT.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"11 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142753010","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}
引用次数: 0
Comprehensive Insight Into Removal and Recovery of Phosphate by a Magnetic Nanocomposite Microparticle Modified With MgFe-Zr Layered Double Hydroxide 用 MgFe-Zr 层状双氢氧化物改性的磁性纳米复合微粒去除和回收磷酸盐的全面见解
IF 3.8 4区 环境科学与生态学
Water, Air, & Soil Pollution Pub Date : 2024-11-28 DOI: 10.1007/s11270-024-07617-0
Mehmet Sürmeli, Hüseyin Yazıcı
{"title":"Comprehensive Insight Into Removal and Recovery of Phosphate by a Magnetic Nanocomposite Microparticle Modified With MgFe-Zr Layered Double Hydroxide","authors":"Mehmet Sürmeli,&nbsp;Hüseyin Yazıcı","doi":"10.1007/s11270-024-07617-0","DOIUrl":"10.1007/s11270-024-07617-0","url":null,"abstract":"<div><p>The influence of various operating variables on the phosphate removal by layered double hydroxide (LDH)-modified magnetic nanocomposite materials has been intensively investigated in the literature. Although many studies have demonstrated that the recovery of phosphate and simultaneous regeneration of the reusable material could be performed successfully by using several regeneration solutions, only the recovery rate has been considered as a decision-making criterion to determine the optimum conditions. This study aimed to comprehensively investigate the influence of various operating variables on the recovery of phosphate as well as its removal from aqueous solutions by a magnetic nanocomposite microparticle modified with MgFe-Zr LDH. To gain better insight on the recovery process, a multi-criteria approach, including recovery rate, structural stability, particle weight loss, dissolution of material components, and characterization of the regenerated material, was adopted. According to the results, the most important operating variable influencing both the removal process and the recovery process was determined as the solution pH. Derived from the results, the main mechanisms involved in the removal and recovery process were proposed and the kinetics and thermodynamic of the removal process were evaluated. Under the optimum conditions, the removal efficiency and the specific removal capacity was determined to be 96.4% and 9.6 mg PO<sub>4</sub>-P/g, respectively, while 84.8% of the removed PO<sub>4</sub>-P could be recovered by using 50 mL 1.0 NaOH solution within 60 min. EDS, XRD, FT-IR and ICP-OES analyses confirmed that the particle retained its initial structural stability during the removal and recovery process under the optimized operating conditions.</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":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737341","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}
引用次数: 0
Carbon territoriality at the land-water interface 水陆交界处的碳领地
IF 8.6 1区 环境科学与生态学
Global Environmental Change Pub Date : 2024-11-28 DOI: 10.1016/j.gloenvcha.2024.102954
Michelle Ann Miller
{"title":"Carbon territoriality at the land-water interface","authors":"Michelle Ann Miller","doi":"10.1016/j.gloenvcha.2024.102954","DOIUrl":"10.1016/j.gloenvcha.2024.102954","url":null,"abstract":"<div><div>Large volumes of organic carbon are stored in wetland ecosystems such as mangrove forests, peatlands, salt marshes and seagrass meadows. Efforts to mitigate anthropogenic climate change are transforming the governance of these naturally saturated carbon sinks. Scientific and market valuations of wetlands as carbon have prompted diverse experimentation with carbon sequestration projects and offset programs. These activities may displace wetland-reliant communities and add to societal equalities. This perspective paper develops the concept of carbon territoriality to explore emerging spaces of climate governance in wetlands. It moves beyond terra-centric policy debates tied to fixed and flat landscapes by integrating literature on the dynamic (sub)surface and atmospheric territorial dimensions of carbon. It posits that combining scientific knowledge of fixed carbon stocks with the inherited knowledge of coastal and riparian communities about fluid land–water connections could foster more inclusive and equitable forms of climate stewardship within biogeophysically relevant boundaries.</div></div>","PeriodicalId":328,"journal":{"name":"Global Environmental Change","volume":"90 ","pages":"Article 102954"},"PeriodicalIF":8.6,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
引用次数: 0
Research on Remediation of Cadmium-Contaminated Soil by Corn Stalk Biochar/C3N4 Composites 玉米秸秆生物炭/C3N4 复合材料对镉污染土壤的修复研究
IF 3.8 4区 环境科学与生态学
Water, Air, & Soil Pollution Pub Date : 2024-11-27 DOI: 10.1007/s11270-024-07648-7
Luying Sun, Juan Zheng, Yao Xue, Lingfeng Ye, Qijuan Fan
{"title":"Research on Remediation of Cadmium-Contaminated Soil by Corn Stalk Biochar/C3N4 Composites","authors":"Luying Sun,&nbsp;Juan Zheng,&nbsp;Yao Xue,&nbsp;Lingfeng Ye,&nbsp;Qijuan Fan","doi":"10.1007/s11270-024-07648-7","DOIUrl":"10.1007/s11270-024-07648-7","url":null,"abstract":"<div><p>Biomass-activated carbon was prepared from agricultural waste wheat/corn straw, and then mixed with nitrogen (g-C<sub>3</sub>N<sub>4</sub>) in a certain proportion to synthesize carbon-based nanomaterials. Under different experimental conditions (calcination form, mixing ratio), the remediation effects of different types of carbon-based nanomaterials on cadmium (Cd) contaminated soil were investigated. The carbon-based nanomaterial system synthesized from corn biochar mixed nitrogen (g-C<sub>3</sub>N<sub>4</sub>) showed the best adsorption performance. On this basis, the static and dynamic adsorption properties of carbon-based nanomaterials on cadmium (Cd) in soil environment were studied through a series of characterization methods and adsorption models by changing the mixture ratio of corn straw and nitrogen (g-C<sub>3</sub>N<sub>4</sub>), temperature, time, substrate concentration and other background experimental conditions. The results showed that under the conditions of 35 ℃ and adsorption time ≥ 6 h, the calcined and remixed CN: YC = 2:8 samples had the best remediation effect on Cd<sup>2+</sup> contaminated soil with a substrate concentration of 10 mg/L and pH value of 6. Langmuir and Freundlich’s adsorption isothermal models were used to investigate the adsorption mode of NC: YC series samples, which belong to the physical adsorption of a single molecular layer.</p></div>","PeriodicalId":808,"journal":{"name":"Water, Air, & Soil Pollution","volume":"236 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714224","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}
引用次数: 0
Nanomaterials for managing abiotic and biotic stress in the soil–plant system for sustainable agriculture 用于管理土壤-植物系统中非生物和生物压力的纳米材料,促进可持续农业发展
IF 8.131 2区 环境科学与生态学
Environmental Science: Nano Pub Date : 2024-11-27 DOI: 10.1039/d4en00789a
Loren Ochoa, Manoj Shrivastava, Sudhakar Srivastava, Keni Cota-Ruiz, Lijuan Zhao, Jason C. White, Jose Angel Hernandez-Viezcas, Jorge L. Gardea-Torresdey
{"title":"Nanomaterials for managing abiotic and biotic stress in the soil–plant system for sustainable agriculture","authors":"Loren Ochoa, Manoj Shrivastava, Sudhakar Srivastava, Keni Cota-Ruiz, Lijuan Zhao, Jason C. White, Jose Angel Hernandez-Viezcas, Jorge L. Gardea-Torresdey","doi":"10.1039/d4en00789a","DOIUrl":"https://doi.org/10.1039/d4en00789a","url":null,"abstract":"As the global population steadily increases, the need to increase agricultural productivity has become more pressing. It is estimated that agricultural production needs to double in less than 30 years to meet the projected food demand. However, crop species are being cultivated under a range of increasingly challenging environmental stressors, including the effects of climate change and factors. To address these issues, nanotechnology has emerged as an enabling strategy to bolster plant resistance to the adverse effects of stressors and improve their overall performance. In this review, we evaluate recent research in this field, examining the strategies by which nanomaterials (NMs) and nanoparticles (NPs) have been used to facilitate enhanced tolerance to pests, excessive salinity in soil, pathogenic fungi, and other stressors. The intent is to focus on the mechanisms by which plants cope with environmental stressors at the physiological and molecular levels. We also examine how plants interact with and acquire NMs, with a specific focus on the mechanisms behind their beneficial effects regarding stress response. Our review also evaluates key knowledge gaps and offers suggestions on how to address them. Additionally, we discuss the potential of NMs to enhance agricultural production systems and highlight essential considerations for mitigating crop stress and promoting sustainable agriculture at a global scale. While the use of nanotechnology in the agricultural sector is growing and shows tremendous promise, more mechanistic studies and field-scale demonstrations are needed to fully understand and optimize the use of nanomaterials on plants stress tolerance in a changing climate. In addition, few studies conducted life cycle field experiments to verify the effects of nano-agrichemicals on yield and nutritional quality, and importantly, there is a lack of multiple-year and multiple-location experiments. Only by doing this can the technology-readiness-level of nano-enabled agro-technologies be improved and forwarded to commercial application.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"187 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142718571","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}
引用次数: 0
Oxygen vacancies boost the efficacy of MnO2 nanoparticles in catalyzing hydrolytic degradation of organophosphate esters: Implications for managing plastic additive pollution 氧空位提高了二氧化锰纳米颗粒催化水解降解有机磷酸酯的功效:管理塑料添加剂污染的意义
IF 8.131 2区 环境科学与生态学
Environmental Science: Nano Pub Date : 2024-11-27 DOI: 10.1039/d4en00911h
Zongsheng Liang, keman liu, Yueyue Li, Yaqi Liu, Chuanjia Jiang, Tong Zhang, Wei Chen
{"title":"Oxygen vacancies boost the efficacy of MnO2 nanoparticles in catalyzing hydrolytic degradation of organophosphate esters: Implications for managing plastic additive pollution","authors":"Zongsheng Liang, keman liu, Yueyue Li, Yaqi Liu, Chuanjia Jiang, Tong Zhang, Wei Chen","doi":"10.1039/d4en00911h","DOIUrl":"https://doi.org/10.1039/d4en00911h","url":null,"abstract":"The widespread plastic pollution has raised significant concerns. The breakdown process of plastic debris during weathering not only generate microplastics and nanoplastics, but also release large quantities of harmful chemical additives such as phthalates and organophosphate esters (OPEs). Metal oxides, particularly those in the form of nanoparticles, play an essential role in mediating the environmental transformation of plastic additives. However, the key structure–activity relationships governing metal oxide-mediated transformation processes remain poorly understood. Here, we demonstrate that oxygen vacancies (OVs), which are common in metal oxide nanomaterials, significantly contribute to the enhanced catalytic performance of α-MnO2 nanoparticles in promoting the hydrolysis of 4-nitrophenyl phosphate (pNPP), a model OPE pollutant. The α-MnO2 nanorods containing different OV concentrations (obtained by calcination under different atmospheres, i.e., N2 versus air) promote pNPP hydrolysis to different degrees, and the α-MnO2 material with a higher OV concentration shows higher catalytic activity. The results from spectroscopic and theoretical investigations reveal that OVs regulate the adsorption affinity to pNPP by adjusting the coordination saturation of the Mn site on the α-MnO2 surface. Additionally, the enhanced Lewis acidity at these sites (as confirmed by pyridine adsorption infrared spectroscopy and temperature-programmed desorption of ammonia) promotes the electron redistribution in pNPP, which decreases the stability of the P–O bond and enhances the reactivity of α-MnO2 towards pNPP. The findings demonstrate that metal oxide nanomaterials can significantly influence the fate and transformation of microplastic additives, and highlight the potential of defect engineering in amplifying metal oxides’ efficacy for environmental cleanup.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"37 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142718569","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}
引用次数: 0
Solid Phase Silver Sulfide Nanoparticles Contribute Significantly to Biotic Silver in Agricultural Systems 固相纳米硫化银为农业系统中的生物银做出重大贡献
IF 8.131 2区 环境科学与生态学
Environmental Science: Nano Pub Date : 2024-11-26 DOI: 10.1039/d4en00961d
Yingnan Huang, Huijun Yan, Fei Dang, Zhenyu Wang, Jason C. White, Yujun Wang
{"title":"Solid Phase Silver Sulfide Nanoparticles Contribute Significantly to Biotic Silver in Agricultural Systems","authors":"Yingnan Huang, Huijun Yan, Fei Dang, Zhenyu Wang, Jason C. White, Yujun Wang","doi":"10.1039/d4en00961d","DOIUrl":"https://doi.org/10.1039/d4en00961d","url":null,"abstract":"The current and continued influx of engineered nanoparticles (NPs) into the environment is significant, including the release of NPs that have been historically stored or retained in soils to various waterbodies. However, the reactivity and dynamic nature of NPs transformation processes are poorly understood due to the lack of long-term environmentally relevant experiments that accurately represent ecosystem complexity. Here, we established a two-year mesocosm system to quantify the relative reactivity of silver sulfide NPs using stable isotope tracers, with more recent 109Ag2S-NPs inputs to the 80 L water column (water-borne NPs, 141 mg) and historically stored Ag2S-NPs in soils (soil-borne NPs, 4.5 ± 0.3 μg g−1). Soil-borne NPs accounted for 59.4–92.1% of the Ag accumulation in the grain of rice Oryza sativa L. (31.4–112.4 μg kg−1), radish roots Raphanus sativus L. (106.2–396.7 μg kg−1), and rice borers Chilo suppressalis (21.5–30.7 μg kg−1), highlighting the significance of soil-borne NPs in agricultural ecosystems. Based on the measured soil-to-plant transfer factors, recommended concentrations of soil-borne NPs should be less than 2.4 μg Ag g−1 for rice growth and 0.7 μg Ag g−1 for radish growth to minimize human exposure to silver via consumption of these edible tissues. This work demonstrates that quantifying the reactivity of NPs transformation processes and different NPs fractions in the environment is not only important to accurately characterizing the risk of these materials but also to ensuring the safety and sustainability of agriculture.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"16 1","pages":""},"PeriodicalIF":8.131,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142713244","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}
引用次数: 0
Synthesis and Characterization of Thiol-Functionalized Magnetic (Core) Mesoporous Silica-Titanium (Shell-Shell) Nanocomposites for Efficient Copper Ions Removal from Aqueous Solutions 用于从水溶液中高效去除铜离子的硫醇官能化磁性(核)介孔二氧化硅-钛(壳)纳米复合材料的合成与表征
IF 3.8 4区 环境科学与生态学
Water, Air, & Soil Pollution Pub Date : 2024-11-26 DOI: 10.1007/s11270-024-07638-9
Aurangzeb Junejo, Irfan Ahmed Abbasi, Du Ri Park, Moon Jihee, Ick Tae Yeom
{"title":"Synthesis and Characterization of Thiol-Functionalized Magnetic (Core) Mesoporous Silica-Titanium (Shell-Shell) Nanocomposites for Efficient Copper Ions Removal from Aqueous Solutions","authors":"Aurangzeb Junejo,&nbsp;Irfan Ahmed Abbasi,&nbsp;Du Ri Park,&nbsp;Moon Jihee,&nbsp;Ick Tae Yeom","doi":"10.1007/s11270-024-07638-9","DOIUrl":"10.1007/s11270-024-07638-9","url":null,"abstract":"<div><p>In this study, magnetite (Fe<sub>3</sub>O<sub>4</sub>) nanoparticles were synthesized simultaneously with mesoporous silica (MCM-41), followed by the attachment of mesoporous titanium dioxide (mTiO<sub>2</sub>) to obtain Fe<sub>3</sub>O<sub>4</sub>@MCM-41@mTiO<sub>2</sub>. 3-mercaptopropyl trimethoxysilane (MPTMS) was used as a precursor for the functionalization of thiol over magnetic mesoporous titania-silica is referred to as Fe<sub>3</sub>O<sub>4</sub>@MCM-41@mTiO<sub>2</sub>@SH. Fourier-transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), zeta potentials analysis, and Brunauer–Emmett–Teller (BET) analysis were used to characterize the adsorbents. Parameters that influence adsorption, such as pH, adsorbent dosage, contact time, adsorbate concentration, and thermodynamics, were examined for the removal of copper ions from aqueous solutions. pH 6.5 was determined to be the optimal condition for the experiments. The Sips isotherm and pseudo-second-order model exhibited the highest degree of fit for both adsorbents Fe<sub>3</sub>O<sub>4</sub>@MCM-41@mTiO<sub>2</sub> and Fe<sub>3</sub>O<sub>4</sub>@MCM-41@mTiO<sub>2</sub>@SH, respectively. The maximum adsorption capacity of Fe<sub>3</sub>O<sub>4</sub>@MCM-41@mTiO<sub>2</sub>@SH was 30.08 mg/g which was reported higher than another adsorbent, and further investigation was carried out for Fe<sub>3</sub>O<sub>4</sub>@MCM-41@mTiO<sub>2</sub>@SH like, thermodynamic analysis and recyclability. The thermodynamics demonstrated that the adsorption was spontaneous and endothermic, and the positive ΔS° also increased the disorder or randomness of the system. Fe<sub>3</sub>O<sub>4</sub>@MCM-41@mTiO<sub>2</sub>@SH also has the potential to be recycled up to five times for copper ions, with approximately 70% removal efficiency from aqueous solutions.</p></div>","PeriodicalId":808,"journal":{"name":"Water, Air, & Soil Pollution","volume":"236 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714282","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}
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