Environmental Nanotechnology, Monitoring and Management最新文献_第5页

rGO/Carbon composite-based electrocatalytic electrodes for efficient nitrate adsorption and reduction − current challenges and future perspective 基于氧化石墨烯/碳复合材料的高效硝酸盐吸附和还原电催化电极-当前挑战和未来展望

Q1 Environmental Science

Environmental Nanotechnology, Monitoring and Management

Pub Date : 2025-06-01 DOI: 10.1016/j.enmm.2025.101080

Krishnan Vancheeswaran Prasad , Rachel Angeline Lenin , Mohanraj Kumar , Jih-Hsing Chang

The summary of this review paper addresses the pressing issue of nitrate contamination in water sources, increasing concern primarily due to agricultural runoff and industrial waste. Elevated nitrate levels pose significant risks to both human health, such as methemoglobinemia (blue baby syndrome), and aquatic ecosystems through processes like eutrophication. The paper examines the potential of carbon composite-based electrocatalytic electrodes, particularly those incorporating reduced graphene oxide (rGO), for effectively removing nitrates from contaminated water. The review uniquely contributes by analyzing nitrate reduction mechanisms, rGO’s catalytic role, electrode fabrication challenges, operational stability, pilot-scale implementation, and pathways for industrial adoption of rGO-based electrocatalysts. The high surface area of these materials makes them interesting, have superior conductivity, and excellent catalytic properties, which enhance their ability to adsorb and reduce nitrate ions. It demonstrates how major advancements in carbon composites have improved the effectiveness and selectivity of nitrate reduction, demonstrating their potential for real-world applications. However, challenges remain, particularly about scalability, the durability of the materials, and the unwanted production of by-products like ammonia during the reduction process. The further research is necessary to overcome these challenges by focusing on the development of more stable, scalable, and cost-effective materials. Reducing harmful by-products will also be essential for practical industrial applications. Advancements in this field will contribute to sustainable water treatment and the achievement of Sustainable Development Goal, which focuses on clean water and sanitation.

本文综述了水源中硝酸盐污染的紧迫问题，主要是由于农业径流和工业废水引起的。硝酸盐水平升高对人类健康（如高铁血红蛋白血症（蓝婴综合症））和水生生态系统（如富营养化）都构成重大风险。本文研究了基于碳复合材料的电催化电极的潜力，特别是那些含有还原氧化石墨烯（rGO）的电极，可以有效地去除污染水中的硝酸盐。该综述通过分析硝酸还原机制、氧化石墨烯的催化作用、电极制造挑战、操作稳定性、中试规模实施以及工业采用氧化石墨烯电催化剂的途径，做出了独特的贡献。这些材料的高表面积使它们变得有趣，具有优异的导电性和优异的催化性能，这增强了它们吸附和还原硝酸盐离子的能力。它展示了碳复合材料的重大进步如何提高了硝酸盐还原的有效性和选择性，展示了它们在现实世界中的应用潜力。然而，挑战依然存在，特别是在可扩展性、材料的耐久性以及在还原过程中产生的副产品（如氨）方面。为了克服这些挑战，进一步的研究是必要的，重点是开发更稳定、可扩展和更具成本效益的材料。减少有害的副产品对实际工业应用也至关重要。这一领域的进展将有助于可持续水处理和实现以清洁水和卫生为重点的可持续发展目标。

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引用次数: 0

Antimony retention and transformation: a novel approach using microfluidics and hydrogel, biocomposite nanomagnetite aggregates 锑的保留和转化：一种利用微流体和水凝胶、生物复合纳米磁铁矿聚集体的新方法

Q1 Environmental Science

Environmental Nanotechnology, Monitoring and Management

Pub Date : 2025-06-01 DOI: 10.1016/j.enmm.2025.101083

Evgenia-Maria Papaslioti , Hervé Tabuteau , Julien Farasin , Delphine Vantelon , Valerie Magnin , Laurent Charlet

Antimony (Sb) is a redox sensitive metalloid increasingly recognized as an emerging contaminant of global concern due to its toxicity and widespread occurrence in natural and anthropogenically impacted water systems. It is commonly found in both drinking and wastewater, where it poses potential risks to human health. Magnetite nanoparticles, known as active retention agents for redox-sensitive contaminants, are combined here with polymeric matrices to ease their application in water treatment systems and to enhance their stability, dispersibility, and sorption efficiency. In this study, we assess Sb retention using hydrogel-nanomagnetite aggregates, with and without chitosan coating, under flow-through microfluidic conditions that mimic natural and engineered aquatic environments. Advanced synchrotron-based μ-XRF mapping and μ-XANES spectroscopy were employed for the first time to such integrated system to simultaneously resolve the spatial distribution and oxidation state of sorbed Sb. Antimonate immobilization followed two distinct, input concentration-dependent pathways: (i) reduction to Sb(III), forming stable inner-sphere Fe–O–Sb complexes, or (ii) adsorption via electrostatic and complexation mechanisms. At low Sb(V) concentrations reduction is favored in chitosan-free aggregates, enabling homogeneous Sb(III) diffusion through the media. At higher concentrations, and particularly in chitosan-coated systems, Sb(V) is immobilized predominantly via adsorption, accumulating on the rim of the aggregates. Chitosan enhances Sb(V) sorption by providing positively charged functional groups and, along with pH and Sb input concentration, controls Sb sorption processes. These findings deepen the understanding of Sb retention mechanisms through redox and sorption interactions in polymer-supported magnetite systems, as revealed using microfluidics technology, and provide a new foundation for the development of advanced water treatment technologies with international relevance for mitigating redox-sensitive contaminants.

锑（Sb）是一种氧化还原敏感类金属，由于其毒性和广泛存在于自然和人为影响的水系统中，越来越被认为是全球关注的新兴污染物。它通常存在于饮用水和废水中，对人类健康构成潜在风险。磁性纳米颗粒，被称为氧化还原敏感污染物的活性保留剂，在这里与聚合物基质结合，以减轻其在水处理系统中的应用，并提高其稳定性，分散性和吸附效率。在这项研究中，我们使用水凝胶-纳米磁铁矿聚集体，在模拟自然和工程水生环境的流过微流控条件下，在有壳聚糖涂层和没有壳聚糖涂层的情况下，评估了Sb的保留率。基于同步加速器的μ-XRF图谱和μ-XANES光谱首次应用于该集成系统，同时解析了吸附Sb的空间分布和氧化状态。锑酸盐固定化遵循两种不同的输入浓度依赖途径：(i)还原Sb(III)，形成稳定的球内Fe-O-Sb配合物，或（ii）通过静电和络合机制吸附Sb。在低Sb(V)浓度下，无壳聚糖的聚集体有利于还原，使Sb（III）在介质中均匀扩散。在较高浓度下，特别是在壳聚糖包覆体系中，Sb(V)主要通过吸附固定，积聚在聚集体的边缘。壳聚糖通过提供带正电荷的官能团增强Sb(V)的吸附，并与pH和Sb输入浓度一起控制Sb的吸附过程。这些发现加深了对聚合物支撑的磁铁矿系统中通过氧化还原和吸附相互作用的Sb保留机制的理解，并为开发具有国际相关性的先进水处理技术提供了新的基础，以减轻氧化还原敏感污染物。

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引用次数: 0

Novel insights into the presence and risks of phthalate esters in the Citarum River, Indonesia: Seasonal variations 新见解的存在和邻苯二甲酸酯的风险在Citarum河，印度尼西亚：季节性变化

Q1 Environmental Science

Environmental Nanotechnology, Monitoring and Management

Pub Date : 2025-06-01 DOI: 10.1016/j.enmm.2025.101082

Diana Rahayuning Wulan , Nurul Fahimah , Mariska Margaret Pitoi , Raden Tina Rosmalina , Muammar Qadafi , Hanny Meirinawati , Wulan Ayu Ningsih

This study investigates the occurrence and risks of phthalate acid esters (PAEs) in the Citarum River across 11 sampling sites during rainy and dry seasons. The average total concentration of PAEs was higher in the rainy season (79.18 ± 50.51 µg/L) than in the dry season (1.67 ± 0.71 µg/L). Dimethyl phthalate (DMP), diethyl phthalate (DEP), and bis (2-Ethylhexyl) phthalate (DEHP) were detected only during the rainy season with concentration ranges of not detected (ND) - 7.284, 7.135 - 55.674, and ND - 20.713 µg/L, respectively. Dibutyl phthalate (DBP) was present in both seasons, with an increase from ND - 2.758 µg/L (dry season) to 9.681 - 160.245 µg/L (rainy season), contributing to elevated levels of endocrine-disrupting chemicals (EDCs) (Estradiol Equivalent Concentration (EEQ) > 0.002 µg/L). Ecological risks were low during the dry season but rose to high levels in the rainy season (risk quotient (RQ) > 1), driven by DBP and DEP exposure. Health risk assessments showed non-carcinogenic risks (target hazard quotient (THQ) < 1) for consuming Tilapia sp. and Common carp at most sites, except one upstream location during the rainy season, where toddlers were at risk. DBP was the main contributor to these risks, accounting for 80.85% in Tilapia sp. and 89.05% in Common carp. DEHP-associated cancer risks were absent in the dry season but appeared at one location during the rainy season. The findings highlight the urgent need to address PAEs pollution in the Citarum River through source control, monitoring in water compartments, and establishing regulatory limits for PAEs in wastewater and surface waters.

本研究调查了Citarum河在雨季和旱季11个采样点中邻苯二甲酸酯（PAEs）的发生和风险。雨季PAEs平均总浓度（79.18±50.51µg/L）高于旱季（1.67±0.71µg/L）。邻苯二甲酸二甲酯（DMP）、邻苯二甲酸二乙酯（DEP）和邻苯二甲酸二乙酯（DEHP）仅在雨季检测到，浓度范围分别为未检出(ND) - 7.284、7.135 - 55.674和ND - 20.713µg/L。两个季节都存在邻苯二甲酸二丁酯（DBP），从ND - 2.758µg/L（旱季）增加到9.681 - 160.245µg/L（雨季），导致内分泌干扰化学物质（EDCs）水平升高(雌二醇当量浓度（EEQ） >；0.002µg / L)。旱季生态风险较低，雨季生态风险较高（RQ） >；1) DBP和DEP暴露驱动。健康风险评估显示非致癌风险(目标危害商（THQ） <；1)在大多数地点食用罗非鱼和鲤鱼，除了一个上游地点在雨季，幼儿有危险。DBP是这些风险的主要贡献者，在罗非鱼中占80.85%，在鲤鱼中占89.05%。dehp相关的癌症风险在旱季不存在，但在雨季出现在一个地点。研究结果强调了解决Citarum河中PAEs污染的迫切需要，包括通过源头控制、水区监测以及建立废水和地表水中PAEs的监管限制。

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引用次数: 0

Cobalt iron oxide nanorods with multi functions: solvothermal synthesis and characterizations as potent antimicrobial agent and photocatalyst 多功能氧化钴铁纳米棒：溶剂热合成及其抗菌和光催化剂的表征

Q1 Environmental Science

Environmental Nanotechnology, Monitoring and Management

Pub Date : 2025-06-01 DOI: 10.1016/j.enmm.2025.101079

Bushra Uzair , Zukhra Abbasi , Basma Gul , Zulqurnain Ali , Khuram Shahzad , Sadaf Mushtaq , Farid Menaa

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 < 0.0001) against MDR Pseudomonas aeruginosa, exhibiting a notable zone of inhibition measuring 25 mm. Furthermore, they displayed significant (p < 0.001) antifungal properties inhibiting the growth of Aspergillus flavus (18 mm), Aspergillus niger (23 mm) and Candida albicans (25 mm). Moreover, the CoFe2O4 nanorods inhibited 90 % biofilm formation by Pseudomonas aeruginosa 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.

对微生物感染和环境污染的日益关注要求探索能够有效解决这两个问题的先进材料。本文采用微波辅助溶剂热法制备了基于钴氧化铁纳米棒的多功能杂化材料。x射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）和扫描电子显微镜（SEM）分析了纳米材料的物理化学性质。SEM分析显示，纳米钴氧化铁颗粒的平均粒径为40 nm， XRD分析证实了纳米钴氧化铁颗粒（CIO NRs）的结晶性质。制备的CIO纳米棒具有良好的抗菌活性(p <；0.0001)抗耐多药铜绿假单胞菌，表现出25 mm的显著抑制区。此外，他们表现出显著的(p <；0.001)抗真菌特性，抑制黄曲霉（18 mm）、黑曲霉（23 mm）和白色念珠菌（25 mm）的生长。此外，CoFe2O4纳米棒抑制了90%铜绿假单胞菌在人牙齿上形成的生物膜，突出了其在临床中的潜在用途。此外，在日光照射条件下，CoFe2O4 NRs对亚甲基蓝（MB）、孔雀石绿（MG）和甲基橙（MO）的降解率分别为96%、95%和98%。总之，这些发现强调了cionr的多功能性，可以为其在医学上的适用性增加重要价值，作为各种微生物感染和水处理技术的解决方案。

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引用次数: 0

Environmentally friendly synthesis of gold nanoparticles at room temperature for chlorpyrifos-methyl detection in water samples 室温下环境友好合成金纳米颗粒用于水样中甲基毒死蜱的检测

Q1 Environmental Science

Environmental Nanotechnology, Monitoring and Management

Pub Date : 2025-05-23 DOI: 10.1016/j.enmm.2025.101081

Ángela Yanina Aguilera , Yasmin Safe , Sára Doubravská , Valeria Springer

In this study, a facile synthesis of gold nanoparticles (AuNPs) is achieved through an environmentally friendly method in less than 2 min, using ascorbic acid and pentetic acid as reducing and stabilizing agents, under alkaline conditions at room temperature. The effects of the main experimental parameters on the synthesis performance were analyzed using response surface methodology. The obtained particles, spherical in shape and with average size of 9.2 nm, were tested as sensor for determination of chlorpyrifos-methyl (CPM), an organophosphate insecticide widely used in agriculture practices and households, which represent a major concern for the environment and human health. CPM was determined through the changes on the localized surface plasmon resonance (LSPR) band of AuNPs at 527 nm. Under optimal conditions, the method was evaluated in the concentration range between 5.00 and 40.0 μg L^-1, with R² > 0.98, limit of detection of 3.79 µg L^-1 and RSD values lower than 6.5 %. The applicability of this methodology for the analysis of real samples, including river water and well water, was tested with satisfactory recovery values (84.0–––98.8 %). Besides, the practicality and functionality of the proposed method were assessed by the Blue Applicability Grade Index (BAGI), a new metric tool developed in 2023, with an outstanding performance.

在本研究中，采用抗坏血酸和戊酸作为还原剂和稳定剂，在室温碱性条件下，通过一种环保的方法，在不到2分钟的时间内实现了金纳米颗粒（AuNPs）的快速合成。利用响应面法分析了主要实验参数对合成性能的影响。所获得的颗粒呈球形，平均大小为9.2纳米，作为测定甲基毒死蜱（CPM）的传感器进行了测试。CPM是一种广泛用于农业实践和家庭的有机磷杀虫剂，对环境和人类健康构成重大关切。通过AuNPs在527 nm处局部表面等离子体共振（LSPR）带的变化来确定CPM。在最佳条件下，该方法在5.00 ~ 40.0 μg -1的浓度范围内进行评价，R2 >；0.98，检出限为3.79µg L-1， RSD值小于6.5%。该方法适用于实际样品的分析，包括河水和井水，回收率（84.0—98.8%）令人满意。此外，该方法的实用性和功能性在2023年开发的新度量工具蓝色适用性等级指数（BAGI）中得到了突出的评价。

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引用次数: 0

Phosphate Removal from Aqueous Solution by Electric Arc Furnace Dust as High-Performance and Cost-Effective Adsorbent 电弧炉粉尘作为高效、经济的吸附剂去除水溶液中的磷酸盐

Q1 Environmental Science

Environmental Nanotechnology, Monitoring and Management

Pub Date : 2025-05-17 DOI: 10.1016/j.enmm.2025.101078

Zeinab Purzal , Mehdi Alizadeh , Farnaz Heidari Laybidi , Mohsen Alizadeh

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 > 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.

本研究探讨了对有害的炼钢副产物电弧炉粉尘（EAFD）进行处理，以有效吸附农业废水中的磷酸盐离子。为了对EAFD进行脱毒和提高其吸附性能，比较了热水、碱性氢氧化钠和乙酸浸出三种洗涤方法，结果表明乙酸对铅等重金属的去除效果最好。综合表征包括x射线衍射（XRD）、x射线荧光（XRF）、傅里叶变换红外光谱（FTIR）、场发射扫描电镜（FE-SEM）、动态光散射（DLS）、振动样品压力计（VSM）和电感耦合等离子体质谱（ICP-MS）元素浓度分析，证实形成了有利的表面官能团，纳米级粒度（~ 233 nm），磁性，易于分离。在不同的pH、温度、吸附剂用量和接触时间下进行了吸附实验，在pH为2时，对500 mg/L溶液的磷酸盐去除效率最高可达90%。吸附机理归因于磷酸离子与EAFD表面正电荷位点之间的静电相互作用。热力学分析表明，该过程是自发的吸热过程，动力学模型与Langmuir和Freundlich等温线(R2 >；0.99)。吸附后，SEM-EDS和FTIR分析证实了磷酸盐捕获和表面修饰。上述结果表明，经处理的EAFD具有磁性可回收性、低成本和高吸附能力，可作为一种有效的、可持续的除磷吸附剂，为工业废水处理和工业废物的增值提供了一种很有前景的解决方案。

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引用次数: 0

Simultaneous LC-MS/MS determination of multi-class emerging contaminants in an orange plant system LC-MS/MS同时测定柑橘植物体系中多类新发污染物

Q1 Environmental Science

Environmental Nanotechnology, Monitoring and Management

Pub Date : 2025-05-12 DOI: 10.1016/j.enmm.2025.101077

Mahdiyeh Otoukesh, Claudia Simarro-Gimeno, Félix Hernández, Elena Pitarch

As freshwater supplies decline, agriculture is turning to alternative sources like recycled wastewater for irrigation. However, treated wastewater may still contain organic micropollutants (OMPs), which can contaminate soil, be absorbed by crops, and enter the food chain. This raises the need for analytical methods to reliable identify and quantify OMPs in vegetable and soil matrices at low concentrations. Additionally, advanced wastewater treatment methods are necessary to minimize OMPs in effluents from conventional wastewater treatment plants.

This study, part of a broader project on recycled wastewater for irrigating orange fields, focused on developing a modified QuEChERS method to determine 18 pesticides and 15 pharmaceuticals in soil, orange leaves and fruits. Compounds were quantified using liquid chromatography coupled to tandem mass spectrometry with a triple quadrupole. The methods were validated at two fortification levels (1–5 and 10–50 ng g⁻¹). Matrix effects were evaluated, showing a minimal impact in soil, but significant effects (> 20 %) in oranges and leaves, requiring matrix-matched calibration and/or isotopically labeled internal standards for accurate correction. The recoveries for most compounds were within 70–120 %, with relative standard deviations under 20 %, and limits of quantification ranged 1–5 ng g⁻¹.

In real samples, the insecticide acetamiprid was the most bioaccumulated contaminant, exceeding 20 ng g⁻¹ in leaves. Eleven pesticides were detected at concentrations below the limit of quantification, and the pharmaceutical atorvastatin was found in a soil sample.

随着淡水供应的减少，农业正在转向替代水源，如回收废水用于灌溉。然而，处理后的废水可能仍含有有机微污染物（OMPs），这些污染物会污染土壤，被作物吸收并进入食物链。这增加了对分析方法的需求，以可靠地识别和量化蔬菜和土壤基质中低浓度的omp。此外，必须采用先进的废水处理方法，以最大限度地减少传统废水处理厂流出物中的omp。这项研究是一个更广泛的柑橘田灌溉回收废水项目的一部分，其重点是开发一种改进的QuEChERS方法，以测定土壤、柑橘叶和果实中的18种农药和15种药物。采用液相色谱-三重四极杆串联质谱法对化合物进行定量分析。在两种强化水平（1 - 5和10-50 ng g−1）下验证了该方法。对基质效应进行了评价，表明基质效应对土壤的影响很小，但效果显著(>；20%)，需要基质匹配校准和/或同位素标记的内标进行准确校正。加样回收率在70 ~ 120%之间，相对标准偏差在20%以内，定量限为1 ~ 5 ng g−1。在实际样品中，杀虫剂啶虫脒是生物积累最多的污染物，在叶片中超过20 ng g−1。11种农药的浓度低于定量限制，在土壤样本中发现了药物阿托伐他汀。

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引用次数: 0

Nano-Chitosan coated sand: A sustainable superadsorbent for removal of heavy metals and dye particles from industrial effluents 纳米壳聚糖包覆砂：用于去除工业废水中的重金属和染料颗粒的可持续超吸附剂

Q1 Environmental Science

Environmental Nanotechnology, Monitoring and Management

Pub Date : 2025-05-11 DOI: 10.1016/j.enmm.2025.101076

Md. Nuruzzaman, Md. Ibrahim H. Mondal

Nano-chitosan-coated sand adsorbent was prepared by coating chitosan nanoparticles onto treated Padma River sand. CNPs were produced through the application of ionotropic gelation methodology. The effects of parameters such as pHs, adsorbent dosages, contact times, initial dye concentrations, and temperatures were examined on the maximum adsorption capacity. The maximum adsorption capacities of brilliant green, methylene blue, reactive brown dyes, chromium, and nickel heavy metal ions by NCCS were observed at a temperature of 318 K, which were 5.001 mg/g, 8.012 mg/g, 6.386 mg/g, 48.387 mg/g, and 24.258 mg/g, respectively. The adsorption process conformed to the Langmuir adsorption isotherm, indicating that the adsorption was monolayer. The adsorption process was spontaneous and endothermic across the temperature ranges. As the reaction kinetics analysis indicated, the adsorption process followed a pseudo-second-order kinetic model. The adsorption capacity of NCCS is exceptionally high, allowing for the effective capture and removal of a diverse array of heavy metals and dyes from aqueous solutions, consequently contributing to the advancement of environmental remediation and pollution abatement initiatives.

将壳聚糖纳米颗粒包覆在处理过的帕德玛河砂上，制备了壳聚糖纳米包覆砂吸附剂。CNPs是通过应用离子化凝胶法制备的。考察了ph值、吸附剂用量、接触时间、初始染料浓度和温度等参数对最大吸附量的影响。在318 K温度下，NCCS对亮绿、亚甲基蓝、活性棕、铬、镍等重金属离子的最大吸附量分别为5.001 mg/g、8.012 mg/g、6.386 mg/g、48.387 mg/g和24.258 mg/g。吸附过程符合Langmuir等温线，表明吸附为单层吸附。在整个温度范围内，吸附过程是自发的吸热过程。反应动力学分析表明，吸附过程符合准二级动力学模型。NCCS的吸附能力非常高，可以有效地捕获和去除水溶液中的各种重金属和染料，从而有助于促进环境修复和污染减排举措。

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引用次数: 0

Toxicity analysis and degradation studies of chlorpyrifos in agricultural wastewater using magnesium ferrite-gelatin nanocomposites 铁酸镁-明胶纳米复合材料对毒死蜱在农业废水中的毒性分析及降解研究

Q1 Environmental Science

Environmental Nanotechnology, Monitoring and Management

Pub Date : 2025-05-01 DOI: 10.1016/j.enmm.2025.101075

Adhithya S , K.P. Anupama Raj , Asha Sathish , K. Nithya

In addressing the pressing environmental challenge of Chlorpyrifos (CPF) contamination in agricultural wastewater, we successfully synthesized a novel organic/inorganic bio-adsorbent known as Magnesium-Ferrite Gelatin (MFGEL) nanocomposites using a co-precipitation method. To thoroughly investigate this issue, we collected agricultural wastewater from various locations near Coimbatore, Tamil Nadu, and employed the QuEChERS method followed by High-Performance Liquid Chromatography (HPLC) analysis. Our results confirmed that CPF concentrations exceeded the permissible limits established by the EU and USEPA. From our calibration curve, we determined the limit of detection (LOD) to be 0.0225 mg/L and the limit of quantification (LOQ) to be 0.0683 mg/L, demonstrating the sensitivity of our method. Batch studies on the MFGEL nanocomposites revealed a removal efficiency of 99 % for CPF under optimized conditions. Elemental analysis using Energy Dispersive X-ray Spectroscopy (EDX) provided clear evidence of effective CPF adsorption, identifying the presence of chlorine, phosphorus, and sulfur within the MFGEL structure. Our characterization studies showed a significant reduction in crystallinity, confirming the formation of an amorphous structure due to gelatin’s interference in MFGEL. The Scanning Electron Microscopy (SEM) analysis displayed a rough and highly porous surface with irregular shapes, highlighting the effectiveness of the adsorption process. Furthermore, Brunauer-Emmett-Teller (BET) analysis indicated that MFGEL possesses a mesoporous structure with a surface area of 30.652 m2/g. The results from Fourier-transform infrared (FTIR) and Raman spectroscopy analyses further revealed that gelatin in MFGEL introduces functional groups (such as O–H, N–H, and amide groups) that significantly enhance interaction with CPF. In addition, the ferrite component facilitates additional binding through surface complexation. Our reusability studies demonstrate that MFGEL maintains outstanding performance, retaining an adsorption efficiency of 98.7 % to 87 % and a regeneration efficiency of 96 % to 81 % over five cycles. This emphasizes the remarkable effectiveness and robustness of the MFGEL nanocomposite for CPF remediation in agricultural wastewater.

为了解决农业废水中毒死蜱（CPF）污染的紧迫环境挑战，我们成功地采用共沉淀法合成了一种新型的有机/无机生物吸附剂镁铁氧体明胶（MFGEL）纳米复合材料。为了深入研究这一问题，我们收集了泰米尔纳德邦哥印拜陀附近不同地点的农业废水，并采用QuEChERS方法和高效液相色谱（HPLC）分析。我们的结果证实CPF浓度超过了欧盟和美国环保局规定的允许限度。结果表明，该方法的检出限为0.0225 mg/L，定量限为0.0683 mg/L，具有较高的灵敏度。对MFGEL纳米复合材料的批量研究表明，在优化条件下，CPF的去除率达到99%。使用能量色散x射线光谱（EDX）进行元素分析提供了CPF有效吸附的明确证据，确定了MFGEL结构中氯、磷和硫的存在。我们的表征研究表明结晶度显著降低，证实了由于明胶在MFGEL中的干扰而形成的无定形结构。扫描电镜（SEM）分析显示了一个粗糙的、不规则形状的高多孔表面，突出了吸附过程的有效性。此外，BET （brunauer - emmet - teller）分析表明，MFGEL具有介孔结构，比表面积为30.652 m2/g。傅里叶变换红外（FTIR）和拉曼光谱分析结果进一步表明，MFGEL中的明胶引入了功能基团（如O-H， N-H和酰胺基团），显著增强了与CPF的相互作用。此外，铁氧体组分通过表面络合促进附加结合。我们的重复使用研究表明，MFGEL保持了出色的性能，在五个循环中保持了98.7%至87%的吸附效率和96%至81%的再生效率。这强调了MFGEL纳米复合材料对农业废水CPF修复的显著有效性和稳健性。

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引用次数: 0

Green synthesis approach on fabrication of TiO2 nanoparticle using peel extract of Baccaurea racemosa for photocatalytic degradation of Acid Red-185 用总状巴氏菌皮提取物制备光催化降解酸性红-185的TiO2纳米颗粒的绿色合成方法

Q1 Environmental Science

Environmental Nanotechnology, Monitoring and Management

Pub Date : 2025-04-26 DOI: 10.1016/j.enmm.2025.101074

Deliza , Sri Lungguh Rahayu , Agus Rimus Liandi , Reza Audina Putri , Safni Safni

When it comes to fabricating metal oxide nanoparticles (NPs), green synthesis stands out as a dependable, sustainable, eco-friendly, and remarkable substitute for the more effective and classical chemical processes. This study prepared and investigated green synthesis on fabrication of titanium dioxide nanoparticles (TiO₂ NPs) utilizing peel extract of Baccaurea racemosa and evaluated its photocatalytic activity. The XRD patterns demonstrated the highly crystalline structure of anatase TiO₂ with nanocrystallite size obtained about 8 nm. FESEM image confirmed spherical-shaped of TiO₂ with nanosized about 32 nm and showed that prepared TiO₂ was a stable particle from zeta potential data. The phytochemical components in the peel extract were in responsibility of the capping and reducing agents in the production of TiO₂, as indicated by the FTIR spectra. This study showed that Baccaurea racemosa waste may be a viable reducing and capping agent in synthesis of TiO₂-NPs. Furthermore, the prepared TiO₂ exhibited high photocatalytic activity and 99 % degraded the Acid Red-185 dye which fitted pseudo first order kinetics.

当涉及到制造金属氧化物纳米颗粒（NPs）时，绿色合成作为一种可靠、可持续、环保和显着的替代更有效和经典的化学过程而脱颖而出。本研究利用总形假葡萄皮提取物制备并研究了绿色合成制备二氧化钛纳米粒子（TiO2 NPs），并对其光催化活性进行了评价。XRD谱图显示了锐钛矿型TiO2的高结晶结构，纳米晶尺寸约为8 nm。FESEM图像证实TiO2为球形，纳米尺寸约为32 nm， zeta电位数据表明制备的TiO2是稳定的颗粒。FTIR光谱显示，果皮提取物中的植物化学成分在TiO2的生成过程中起封顶作用和还原剂作用。本研究表明，总状芽孢杆菌废物可能是合成TiO2-NPs的一种可行的还原和封盖剂。制备的TiO2具有较高的光催化活性，对酸性红-185染料的降解率达到99%，符合准一级动力学。

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引用次数: 0