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Synthesis of a TiO2/zeolite composite: Evaluation of adsorption-photodegradation synergy for the removal of Malachite Green 二氧化钛/沸石复合材料的合成:评估吸附-光降解协同作用对孔雀石绿去除效果的影响
IF 5.45 Q1 Physics and Astronomy Pub Date : 2024-05-01 DOI: 10.1016/j.nanoso.2024.101191
Ali Imessaoudene , Omar Mechraoui , Boubekeur Aberkane , Abderrahim Benabbas , Amar Manseri , Younes Moussaoui , Jean-Claude Bollinger , Abdeltif Amrane , Abdelhalim Zoukel , Lotfi Mouni

Preparing by a simple method a versatile and sustainable material that can simultaneously perform effectively as an adsorbent/photocatalyst is a real challenge in wastewater treatment technology. In this work, a composite with 10% (wt%) TiO2 nanoparticles supported on zeolite (TiO2-Zeo) was synthesized by a facile-solid-state dispersion method, and characterized for their physicochemical, phase structure, microstructure, and optical properties. Characterization findings, showed that, for TiO2-Zeo catalyst, the zeolitic matrix preserved its initial structure without any alteration, while its gap energy of 3.23 eV was similar to that of the starting TiO2 material, showing that TiO2 nanoparticles were simply deposited on the surface of the zeolite support. TiO2-Zeo photocatalyst, as well as commercial TiO2 nanoparticles, tested here as a photocatalyst model in view of comparison, were used for the removal of Malachite Green dye (MG) from aqueous solution. The adsorption and photodegradation potential of the catalysts was evaluated under the same operating conditions. It was found that the adsorption kinetics for the two materials were relatively slow, and the pseudo-first-order model can describe accurately the adsorption kinetics data. The equilibrium states were reached after 140 min and 150 min for MG/TiO2-Zeo and MG/TiO2 systems. At 0.5 g.L-1 dose of TiO2-Zeo, the adsorption capacity of MG at equilibrium, and the removal efficiency obtained with 25 mg.L-1 and 35 mg.L-1 were 41.2 mg.g-1 (82.3%), and 46.9 mg.g-1 (65.6%), respectively. Whereas, after 240 min UV irradiation, the obtained values in synergistic adsorption-photodegradation dye removal were superior, namely 47.4 mg.g-1 (92.7%) and 63.6 mg.g-1 (90.2%), respectively. On the other hand, within the range of operating conditions considered, the overall kinetic rate of synergistic adsorption-photodegradation was also simulated using the modified Elovich heterogeneous kinetic model in the two following scenarios: for strong and weak adsorption. Based on the goodness-of-fit criteria values obtained with the two used catalysts, the model appeared globally very consistent with kinetic data in both cases, with a perfect agreement in the strong adsorption case.

在废水处理技术中,如何用简单的方法制备一种多功能、可持续的材料,并同时有效地发挥吸附/光催化剂的作用,是一项真正的挑战。在这项工作中,采用一种简便的固态分散方法合成了一种在沸石上支撑有 10%(重量百分比)TiO2 纳米颗粒的复合材料(TiO2-Zeo),并对其物理化学、相结构、微观结构和光学特性进行了表征。表征结果表明,TiO2-Zeo 催化剂的沸石基体保持了其初始结构,没有发生任何改变,而其间隙能 3.23 eV 与初始 TiO2 材料的间隙能相似,表明 TiO2 纳米颗粒只是简单地沉积在沸石载体表面。TiO2-Zeo 光催化剂和作为光催化剂模型的商用 TiO2 纳米粒子被用于去除水溶液中的孔雀石绿染料(MG)。在相同的操作条件下,对催化剂的吸附和光降解潜力进行了评估。结果表明,两种材料的吸附动力学过程相对缓慢,伪一阶模型可以准确地描述吸附动力学数据。MG/TiO2-Zeo 和 MG/TiO2 系统分别在 140 分钟和 150 分钟后达到平衡状态。当 TiO2-Zeo 的剂量为 0.5 g.L-1 时,MG 在平衡状态下的吸附容量以及在 25 mg.L-1 和 35 mg.L-1 时的去除率分别为 41.2 mg.g-1 (82.3%) 和 46.9 mg.g-1 (65.6%)。而在紫外线照射 240 分钟后,协同吸附-光降解染料去除率更高,分别为 47.4 mg.g-1 (92.7%) 和 63.6 mg.g-1 (90.2%)。另一方面,在所考虑的操作条件范围内,还使用改进的埃洛维奇异质动力学模型模拟了强吸附和弱吸附两种情况下协同吸附-光降解的总体动力学速率。根据所使用的两种催化剂获得的拟合优度标准值,该模型与两种情况下的动力学数据总体上非常一致,在强吸附情况下完全吻合。
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引用次数: 0
Sequestration of divalent heavy metal ions from aqueous environment by adsorption using biomass-bentonite composites as potential adsorbent: Equilibrium and kinetic studies 以生物质-膨润土复合材料为潜在吸附剂,通过吸附作用封存水环境中的二价重金属离子:平衡和动力学研究
IF 5.45 Q1 Physics and Astronomy Pub Date : 2024-05-01 DOI: 10.1016/j.nanoso.2024.101183
Alimoh Helen Alabi , Victoria Aderonke Adekunle , Aminat Adenike Azeez , Bolanle Wuraola Akinwale , Clement Ajibade Olanrewaju , Peter Olusakin Oladoye , Kehinde Shola Obayomi

Hybrid clay adsorbents have been investigated in recent studies as cheap and effective adsorbents for eliminating micropollutants, such as heavy metal ions from aqueous solution. Here, we modified bentonite (BEN) with palm kernel shell and groundnut shell by calcination to obtain palm kernel shell-modified bentonite (BPKS) and groundnut shell-modified bentonite (BGS). We studied the batch equilibrium adsorption of Pb2+, Cd2+ and Ni2+ ions under the influence of dosage, solution pH, contact time and concentration. Under these conditions, we found that the modified adsorbents (BGS and BPKS) had a higher equilibrium adsorption (qe) for the metal ions than unmodified BEN. BEN exhibited Langmuir adsorption capacities (Qo) of 32.47, 14.04 and 14.16 mg/g for Pb2+, Cd2+ and Ni2+, respectively. BGS and BPKS had Qo values of 29.15, 14.27, 16.61 and 31.75, 17.67, 15.625 mg/g for Pb2+, Cd2+, Ni2+, respectively. Investigations revealed that the rate of adsorption on the three adsorbents is best described by a pseudo-second-order kinetic model, with R2 values ≥ 0.9; the intra-particle diffusion model establishes a surface interaction mechanism involving the exchange of electrons between the surfaces of the adsorbents and the adsorbate. Scanning electron microscopy results suggest porous and heterogeneous adsorbent surfaces, indicating a physio-sorption phenomenon. The modifications increased the surface area of BEN from 78.435 to 194.850 and 140.650 m2/g in BGS and BPKS, respectively, using BET surface area analysis. However, the average pore width of BEN reduces from 3.8 to 3.3 nm in both BGS and BPKS. Also, the modification enhanced the cation exchange capacity in BPKS only. The findings from this study offered invaluable insights into how biomass can enhance the physicochemical properties of BEN, as needed for practical environmental application and/or optimization, during the removal of Pb2+, Cd2+ and Ni2+ ions from aqueous media.

最近的研究发现,混合粘土吸附剂是一种廉价而有效的吸附剂,可用于消除水溶液中的重金属离子等微污染物。在这里,我们用棕榈仁壳和花生壳对膨润土(BEN)进行了煅烧改性,得到了棕榈仁壳改性膨润土(BPKS)和花生壳改性膨润土(BGS)。我们研究了在用量、溶液 pH 值、接触时间和浓度的影响下,批量平衡吸附 Pb2+、Cd2+ 和 Ni2+ 离子的情况。在这些条件下,我们发现改性吸附剂(BGS 和 BPKS)对金属离子的平衡吸附量(qe)高于未改性的 BEN。BEN 对 Pb2+、Cd2+ 和 Ni2+ 的兰姆吸附容量(Qo)分别为 32.47、14.04 和 14.16 mg/g。BGS 和 BPKS 对 Pb2+、Cd2+、Ni2+ 的 Qo 值分别为 29.15、14.27、16.61 和 31.75、17.67、15.625 mg/g。研究发现,这三种吸附剂的吸附速率用伪二阶动力学模型描述效果最好,R2 值≥ 0.9;颗粒内扩散模型建立了一种表面相互作用机制,涉及吸附剂表面与吸附质之间的电子交换。扫描电子显微镜结果表明,吸附剂表面多孔且异质,表明存在物理吸附现象。通过 BET 表面积分析,BGS 和 BPKS 中 BEN 的表面积分别从 78.435 m2/g 增加到 194.850 m2/g 和 140.650 m2/g。然而,在 BGS 和 BPKS 中,BEN 的平均孔宽都从 3.8 纳米减小到 3.3 纳米。此外,改性只提高了 BPKS 的阳离子交换容量。这项研究的结果为生物质如何提高 BEN 的物理化学特性提供了宝贵的见解,这也是在去除水介质中的 Pb2+、Cd2+ 和 Ni2+ 离子时实际环境应用和/或优化所需要的。
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引用次数: 0
Formation features and functional properties of Gd2Ti2O7:Sm3+/Nd3+ nanoparticles synthesized by combined method 组合法合成的 Gd2Ti2O7:Sm3+/Nd3+ 纳米粒子的形成特征和功能特性
IF 5.45 Q1 Physics and Astronomy Pub Date : 2024-05-01 DOI: 10.1016/j.nanoso.2024.101194
Vladislav V. Zlobin , Ivan I. Mikhailov , Alexey Kuznetsov , Demid A. Kirilenko , Andrey R. Khayrulline , Ruslan Yu. Smyslov , Alexander N. Bugrov

The present paper is devoted to the investigation of the formation process and growth of Gd2Ti2O7 nanocrystals with a pyrochlore structure doped with Sm3+ and Nd3+ ions. During the Gd2Ti2O7:Sm3+/Nd3+ nanoparticles synthesis, aqueous solutions of gadolinium, samarium and neodymium nitrates were added to a mixture of titanium isopropoxide, and polyethylene glycol was diluted with isopropyl alcohol, after which the resulting substance was evaporated to a gel state and heat-treated according to a two-stage scheme. As a result of the study, it has been shown that the forming material had a trabecular structure with a developed network of macro- and micropores. The use of a two-stage heat treatment promotes uniform distribution of different nature atoms in resulting samples. In addition it has been concluded that gadolinium titanate crystalls with a pyrochlore structure is formed by an aggregation mechanism at 700 °C from an X-ray amorphous precursor. From the point of view of obtaining a single-phase material, a possibility of varying nanocrystals dimensions and the pyrochlore structure defectiveness, annealing of the precursor in the temperature range of 750–900 °C is most promising. In this case, the most significant percentage of Sm3+ and Nd3+ ions, which change their localization with increasing synthesis temperature, are incorporated into the crystal structure of Gd2Ti2O7. Doping of Gd2Ti2O7 nanocrystals not only leads to appearance of expected photoluminescence, but also contributes to manifestation of extraordinary effects in dielectric characteristics of such a material.

本文主要研究了掺杂 Sm3+ 和 Nd3+ 离子的具有热绿宝石结构的 Gd2Ti2O7 纳米晶体的形成过程和生长情况。在合成 Gd2Ti2O7:Sm3+/Nd3+ 纳米粒子的过程中,将钆、钐和钕硝酸盐的水溶液加入到异丙醇钛的混合物中,并用异丙醇稀释聚乙二醇,然后将所得物质蒸发至凝胶状态,并按照两阶段方案进行热处理。研究结果表明,成型材料具有小梁状结构,大孔和微孔网络发达。两阶段热处理的使用促进了不同性质原子在成型样品中的均匀分布。此外,研究还得出结论,具有热绿结构的钛酸钆结晶是在 700 °C 的温度下通过聚集机制从 X 射线无定形前驱体中形成的。从获得单相材料、改变纳米晶体尺寸和热核结构缺陷的可能性的角度来看,在 750-900 °C 的温度范围内对前驱体进行退火是最有前途的。在这种情况下,Gd2Ti2O7 的晶体结构中会掺入比例最大的 Sm3+ 和 Nd3+ 离子,它们会随着合成温度的升高而改变其定位。对 Gd2Ti2O7 纳米晶体的掺杂不仅会产生预期的光致发光,还会使这种材料的介电特性产生非凡的效果。
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引用次数: 0
Biological evaluation and molecular modelling studies of in vivo synthesized ZnO nanoparticles 体内合成氧化锌纳米粒子的生物学评价和分子模型研究
IF 5.45 Q1 Physics and Astronomy Pub Date : 2024-05-01 DOI: 10.1016/j.nanoso.2024.101172
Shanti Joseph , Elizabeth Cherian , M.T. Ramesan , Sarath G. Nair , Reedhu Raj

The ZnO nanoparticle is an excellent candidate for biological applications. It has potential antimicrobial, antioxidant, anticancerous, antidiabetic, anti-inflammatory and wound healing properties because of its biodegradability and biocompatibility. The green method of synthesizing nanoparticles is gaining popularity as it is cost effective and reduces the impact of toxic substances. In the present work, Eichhornia crassipes was used as the plant source for the synthesis of ZnO nanoparticles. It is an invasive aquatic macrophyte that is utilized to exploit its phytoaccumulation property. The goal of the current study was to evaluate the ability of a living plant to transform the accumulated metal into metal nanoparticles in vivo. The formation of ZnO nanoparticles was confirmed by UV–visible spectrophotometry, EDX analysis, FTIR, XRD and HRTEM. A strong absorption peak (300 nm) and an excitonic peak (243 nm) obtained in the UV spectrophotometric analysis confirmed the formation of ZnO nanoparticles. The presence of strong signals for zinc and oxygen in the extracted nanoparticles was identified by EDX analysis. The presence of proteins, alkaloids, flavonoids and phenolics were identified using FTIR and are contributed to the formation of ZnO nps by the reduction reaction. XRD analysis revealed the hexagonal phase wurtzite structure of ZnO with a crystalline size of 16.89 nm. HRTEM analysis revealed that the particles were spherical and agglomerated in nature with an average size of 16 nm which is consistent with the XRD results. The ZnO nanoparticles were evaluated for their antibacterial activity against pathogenic bacterial strains such as Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus and Klebsiella pneumoniae. The antibacterial activity of the ZnO nanoparticles was found to increase with their increasing concentration. The anticancerous activity of ZnO nanoparticles was also evaluated and exhibited a dose-dependent cytotoxicity against MCF-7 cells, which was further confirmed with molecular docking studies. Overall, a rapid, economical and ecofriendly approach for extracting ZnO nanoparticles was established, which can be employed as a potential therapeutic agent, particularly in nanomedicine for bacterial and cancer treatment.

氧化锌纳米粒子是生物应用的绝佳候选材料。由于其生物降解性和生物相容性,它具有潜在的抗菌、抗氧化、抗癌、抗糖尿病、消炎和伤口愈合特性。合成纳米粒子的绿色方法因其成本效益高、减少有毒物质的影响而越来越受欢迎。在本研究中,Eichhornia crassipes 被用作合成 ZnO 纳米粒子的植物源。它是一种入侵性水生大型植物,可利用其植物积累特性。本研究的目的是评估活体植物在体内将积累的金属转化为金属纳米粒子的能力。紫外-可见分光光度法、EDX 分析、傅立叶变换红外光谱、XRD 和 HRTEM 证实了氧化锌纳米粒子的形成。紫外分光光度分析中出现的一个强吸收峰(300 纳米)和一个激发峰(243 纳米)证实了氧化锌纳米粒子的形成。通过 EDX 分析,确定了提取的纳米颗粒中存在锌和氧的强信号。傅立叶变换红外光谱分析确定了蛋白质、生物碱、黄酮类化合物和酚类物质的存在,这些物质通过还原反应促进了氧化锌纳米粒子的形成。XRD 分析表明,氧化锌呈六方晶相菱面体结构,结晶尺寸为 16.89 纳米。HRTEM 分析表明,颗粒呈球形团聚状,平均尺寸为 16 nm,这与 XRD 分析结果一致。评估了氧化锌纳米粒子对大肠杆菌、铜绿假单胞菌、金黄色葡萄球菌和肺炎克雷伯菌等致病菌株的抗菌活性。研究发现,氧化锌纳米粒子的抗菌活性随着其浓度的增加而增强。此外,还评估了氧化锌纳米粒子的抗癌活性,发现其对 MCF-7 细胞具有剂量依赖性细胞毒性,分子对接研究进一步证实了这一点。总之,该研究建立了一种快速、经济、环保的氧化锌纳米颗粒提取方法,可将其用作潜在的治疗剂,特别是用于细菌和癌症治疗的纳米药物。
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引用次数: 0
Review of MXene/MOF composites as photocatalysts for pollutant degradation 作为光催化剂降解污染物的 MXene/MOF 复合材料综述
IF 5.45 Q1 Physics and Astronomy Pub Date : 2024-05-01 DOI: 10.1016/j.nanoso.2024.101192
Arash Fattah-alhosseini , Zahra Sangarimotlagh , Minoo Karbasi , Mosab Kaseem

MXene (Ti3C2Tx), a family of two-dimensional transition metal nitrides, carbides, and carbonitrides, has made them attractive candidates for photocatalytic applications such as pollutant degradation due to their unique characteristics and diverse unsees in recent years. Ti3C2 shows robust stability under conditions of photocatalysis and is appropriate for enduring usage. In order to increase the photocatalytic performance of Ti3C2, it can be composited with other materials such as MOFs and eventually produce more electron-hole pairs to improve its photocatalytic performance and increase the percentage of the pollutant degradation process. Conversely, MOFs are gaining prominence as materials because of their extensive surface area and semiconducting properties. Therefore, the coupling of MXene and MOFs will be promising for the formation of composites with high efficiency for photocatalytic applications including pollutant degradation. Therefore, the primary aim of this study is to reveal the latest advancements in composites based on Ti3C2Tx for the degradation of organic pollutants. MOFs are capable of producing electron/hole pairs induced by light, which subsequently convey electrons to MXene via junctions for photoredox reactions. In this research, properties, morphology, synthesis and optical properties etc. of Ti3C2Tx and their composites are stated. Then, the photodegradation performance of MXene/MOF composite and the mechanisms that were reported for the process of degrading organic dyes through photocatalysis have been discussed. The results showed that MXene/MOF composite has a higher pollutant degradation percentage than MXene. Composite materials of MXene/MOF have demonstrated potential in the degradation of pollutants, attributed to their distinctive characteristics and combined impacts. The MXene element in the composite contributes to superior electrical conductivity and catalytic behavior, whereas the MOFs element is characterized by its extensive surface area and selective adsorption capabilities. Upon their combination, these substances are capable of efficiently eliminating a range of pollutants, including organic dyes, from water. In summary, composites of MXene/MOF exhibit significant promise for environmental cleanup applications, providing high effectiveness, durability, and reusability in processes of pollutant degradation.

MXene(Ti3C2Tx)是二维过渡金属氮化物、碳化物和碳氮化物家族的一种,近年来,由于其独特的特性和多种多样的用途,使其在光催化应用(如污染物降解)方面成为极具吸引力的候选材料。Ti3C2 在光催化条件下表现出强大的稳定性,适合长期使用。为了提高 Ti3C2 的光催化性能,可将其与 MOFs 等其他材料复合,最终产生更多的电子-空穴对,从而提高其光催化性能,增加污染物降解过程的比例。相反,MOFs 因其广泛的表面积和半导体特性,作为一种材料正日益受到重视。因此,MXene 和 MOFs 的耦合有望形成高效的复合材料,用于光催化应用,包括污染物降解。因此,本研究的主要目的是揭示基于 Ti3C2Tx 的复合材料在降解有机污染物方面的最新进展。MOFs 能够在光的诱导下产生电子/空穴对,随后通过结将电子传递给 MXene,从而进行光氧化反应。本研究阐述了 Ti3C2Tx 及其复合材料的性质、形态、合成和光学性能等。然后,讨论了 MXene/MOF 复合材料的光降解性能以及已报道的通过光催化降解有机染料的机理。结果表明,MXene/MOF 复合材料的污染物降解率高于 MXene。MXene/MOF 复合材料在降解污染物方面具有潜力,这归功于其独特的特性和综合影响。复合材料中的 MXene 元素具有优异的导电性和催化作用,而 MOFs 元素则具有广泛的表面积和选择性吸附能力。这些物质结合在一起,能够有效地消除水中的一系列污染物,包括有机染料。总之,MXene/MOF 复合材料在环境净化应用中大有可为,在污染物降解过程中具有高效性、耐久性和可重复使用性。
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引用次数: 0
A DFT study of natural-based materials kaempferol and apigenin for hazardous CO and CO2 gas detection 天然材料山柰酚和芹菜素用于有害 CO 和 CO2 气体检测的 DFT 研究
IF 5.45 Q1 Physics and Astronomy Pub Date : 2024-05-01 DOI: 10.1016/j.nanoso.2024.101197
Ali Basem , Saade Abdalkareem Jasim , Mohamed J. Saadh , Eissa N. Nasser , Abdullah Hasan Jabbar , Nizomiddin Juraev , M. Alaraj , Hussam Abdali Abdulridui , Anupam Yadav

In this research, the chemical and structural attributes of two flavonoid compounds, Kaempferol and Apigenin, have been investigated employing DFT. These compounds are considered the most promising options for high-sensitivity gas sensors. Applying DFT computations, the adsorption behaviour of typical gas molecules over Kaempferol and Apigenin was studied. Apigenin (Kaempferol) could respond to physisorption of CO and CO2 molecules sensitively due to their considerable charge transfer (CT). Particularly, notable progress in transport performance is induced by absorption of both CO and CO2, which makes Apigenin (Kaempferol) an appropriate option to detect CO and CO2 molecules sensitively. In order to examine potential application of natural products in sensing toxic gases, we deeply believe that this work supplies guidance for research groups.

本研究采用 DFT 方法研究了两种类黄酮化合物(堪非醇和芹菜素)的化学和结构属性。这两种化合物被认为是最有希望成为高灵敏度气体传感器的选择。通过 DFT 计算,研究了典型气体分子对山奈酚和芹菜素的吸附行为。由于芹菜素(山柰醇)具有相当高的电荷转移(CT)能力,因此可以灵敏地响应一氧化碳和二氧化碳分子的物理吸附。特别是,吸收一氧化碳和二氧化碳会显著提高传输性能,这使得芹菜素(堪非醇)成为灵敏检测一氧化碳和二氧化碳分子的合适选择。为了研究天然产品在感知有毒气体方面的潜在应用,我们深信这项工作能为研究小组提供指导。
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引用次数: 0
Harnessing the potential of nanostructured materials for sustainable development 利用纳米结构材料的潜力促进可持续发展
IF 5.45 Q1 Physics and Astronomy Pub Date : 2024-05-01 DOI: 10.1016/j.nanoso.2024.101216
Jacob Tizhe Liberty , Aiswarya Anil , Stephen James Ijimdiya , Magdaline Joseph Kwaji , Racheal U. Ijimdiya

In the face of accelerating environmental degradation, surging energy demands, and diminishing bioresources, current approaches prove insufficient in tackling these urgent global crises. Despite concerted efforts, challenges like scalability, cost-effectiveness, and regulatory constraints hinder progress. However, this paper emerges as a beacon of hope. "Harnessing the Potential of Nanostructured Materials for Sustainable Development" offers a comprehensive examination of how nanotechnology transforms environmental, energy, and bioresource domains. From revolutionizing water purification to advancing clean energy technologies and bolstering sustainable agriculture, nanostructured materials proffer groundbreaking solutions. Notably, these innovations promise heightened efficiency, diminished environmental footprints, and optimized resource utilization, heralding a paradigm shift in sustainability efforts. Moreover, by fostering multidisciplinary collaborations, this work paves the path for sustainable development, fostering economic growth, social inclusivity, and environmental preservation. Beyond elucidating pivotal findings and implications, it calls for action, urging further research and implementation endeavors. The time has come to transcend limitations and unleash the full potential of nanotechnology to confront humanity's most pressing challenges and forge a more resilient and sustainable future.

面对环境加速恶化、能源需求激增和生物资源日益减少,目前的方法不足以解决这些紧迫的全球危机。尽管各方齐心协力,但可扩展性、成本效益和监管限制等挑战阻碍了进展。然而,这篇论文的出现给我们带来了希望的灯塔。"利用纳米结构材料的潜力促进可持续发展 "全面探讨了纳米技术如何改变环境、能源和生物资源领域。从彻底改变水的净化,到推进清洁能源技术和支持可持续农业,纳米结构材料提供了突破性的解决方案。值得注意的是,这些创新有望提高效率、减少环境足迹和优化资源利用,预示着可持续发展努力的模式转变。此外,通过促进多学科合作,这项工作为可持续发展铺平了道路,促进了经济增长、社会包容和环境保护。除了阐明关键的研究结果和影响之外,它还呼吁采取行动,敦促开展进一步的研究和实施工作。现在是超越局限、充分释放纳米技术潜力的时候了,以应对人类最紧迫的挑战,打造更具复原力和可持续性的未来。
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引用次数: 0
Biogenic synthesis of silver nanoparticles from Solanum tuberosum peel and their potent antibacterial action 从茄科植物块茎皮中生物合成银纳米粒子及其强效抗菌作用
IF 5.45 Q1 Physics and Astronomy Pub Date : 2024-05-01 DOI: 10.1016/j.nanoso.2024.101190
Anugrah Michael , Aniket Singh , Richa Mishra , Arpita Roy , Amit Roy , Kirtanjot Kaur , Sarvesh Rustagi , Sumira Malik , Rajan Verma , Kuldeep Sharma

The utilisation of peel extracts for the biogenic synthesis of nanoparticles has garnered attention because of their economical and environmentally friendly attributes, along with their potential for large-scale production. Among the metallic nanoparticles, silver is highly efficient against various pathogens, biocompatible and easy to incorporate into medicinal applications. This investigation focuses on the use of Solanum tuberosum peel extract (commonly known as potato peel), for formation of silver nanoparticles. UV–visible spectrometry revealed a distinctive AgNP peak at 471 nm, while XRD analysis confirmed the crystalline nature of nanosilver, featuring an average crystallite size of 13.65 nm. Additionally, FESEM imaging revealed a nearly spherical surface morphology of the AgNPs, with notable clusters. Significant FTIR peaks indicated the presence of phytoconstituents, which acted as effective reducing agents during the AgNP synthesis. To evaluate the antibacterial efficacy, the synthesised AgNPs were evaluated using the agar-well diffusion method against six bacterial strains, including both gram-positive and gram-negative strains, with concentrations of 100, 500 and 1000 µg/ml. The results were compared to streptomycin (control), which exhibited the most substantial inhibition zone at a concentration of 1000 µg/ml, for Staphylococcus aureus (8 mm), Streptococcus pneumoniae (10 mm), Streptococcus anginosus (10 mm), Bacillus subtilis (10 mm), Pseudomonas aeruginosa (12 mm) and Escherichia coli (8 mm) were observed. This study highlights an innovative approach to repurposing frequently produced biowaste (potato peel) into functional nanomaterials possessing significant antibacterial properties, thus underscoring a novel strategy for waste disposal and the environmentally responsible production of nanoparticles.

利用果皮提取物进行纳米粒子的生物合成因其经济、环保的特性及其大规模生产的潜力而备受关注。在金属纳米粒子中,银具有高效抗各种病原体、生物相容性好、易于药用等特点。这项研究的重点是利用茄科植物块茎的果皮提取物(俗称马铃薯皮)形成银纳米粒子。紫外-可见光谱法在 471 纳米处显示出独特的 AgNP 峰,而 XRD 分析则证实了纳米银的结晶性质,其平均结晶尺寸为 13.65 纳米。此外,FESEM 成像显示,AgNPs 的表面形态接近球形,并有明显的团簇。明显的傅立叶变换红外光谱峰表明存在植物成分,它们在 AgNP 合成过程中起到了有效的还原剂作用。为了评估 AgNPs 的抗菌功效,采用琼脂-孔扩散法对六种细菌菌株(包括革兰氏阳性和阴性菌株)进行了评估,浓度分别为 100、500 和 1000 µg/ml。结果与链霉素(对照组)进行了比较,后者在浓度为 1000 µg/ml 时对金黄色葡萄球菌(8 毫米)、肺炎链球菌(10 毫米)、金黄色葡萄球菌(10 毫米)、枯草杆菌(10 毫米)、铜绿假单胞菌(12 毫米)和大肠杆菌(8 毫米)的抑制区最大。这项研究强调了一种创新方法,即把经常产生的生物废物(马铃薯皮)再利用为具有显著抗菌特性的功能性纳米材料,从而强调了一种新的废物处理战略和对环境负责的纳米粒子生产。
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引用次数: 0
Characterization of TiO2 nanoparticles for nanomaterial applications: Crystallite size, microstrain and phase analysis using multiple techniques 用于纳米材料应用的二氧化钛纳米颗粒的表征:使用多种技术进行晶体尺寸、微应变和相分析
IF 5.45 Q1 Physics and Astronomy Pub Date : 2024-05-01 DOI: 10.1016/j.nanoso.2024.101168
Sukarman , Budi Kristiawan , Khoirudin , Amri Abdulah , Koji Enoki , Agung Tri Wijayanta

This study aimed to verify the suitability of TiO2 nanoparticles as nanomaterials in terms of crystallite size, microstrain and phase. The TiO2 nanoparticles were tested experimentally in suspensions of mono ethylene glycol and distilled water (MEG-DW) at ratios of 10:90, 25:75, and 40:60. The nanoparticles were dispersed in the base liquid via a two-step process, resulting in the formation of TiO2-3%/MEG-10, TiO2-3%/MEG-25, and TiO2-3%/MEG-40 nanofluids. The results revealed average crystallite sizes of approximately 20.10, 22.10, and 39.6 nm for the three nanofluid samples, as determined by the Scherrer equation, Williamson–Hall (W–H) plot, and TEM-ImageJ software. These results confirm that the TiO2 nanoparticles meet the nanomaterial criteria with a sub-100 nm size. The microstrain analysis yielded values of 0.000020, 0.000299, and 0.001386 for the three samples and further investigation confirmed the presence of rutile. The high-temperature stability of the rutile phase makes the TiO2 nanofluids suitable for use in industrial heating systems.

本研究旨在验证二氧化钛纳米颗粒作为纳米材料在晶粒尺寸、微应变和相位方面的适用性。在单乙二醇和蒸馏水(MEG-DW)比例为 10:90、25:75 和 40:60 的悬浮液中对二氧化钛纳米粒子进行了实验测试。通过两步法将纳米粒子分散在基液中,形成了 TiO2-3%/MEG-10、TiO2-3%/MEG-25 和 TiO2-3%/MEG-40 纳米流体。通过舍勒方程、Williamson-Hall (W-H) 图和 TEM-ImageJ 软件测定,结果显示三种纳米流体样品的平均晶粒大小分别约为 20.10、22.10 和 39.6 纳米。这些结果证实,TiO2 纳米粒子符合纳米材料标准,尺寸小于 100 nm。三个样品的微应变分析值分别为 0.000020、0.000299 和 0.001386,进一步研究证实了金红石的存在。金红石相的高温稳定性使二氧化钛纳米流体适用于工业加热系统。
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引用次数: 0
Synthesis of 1, 2, 3-triazole linked 5 fluorouracil - carbon dots -folate conjugates for target specific anticancer activity and cell imaging applications 合成 1, 2, 3-三唑连接的 5 氟尿嘧啶-碳点-叶酸共轭物,用于靶向特异性抗癌活性和细胞成像应用
IF 5.45 Q1 Physics and Astronomy Pub Date : 2024-05-01 DOI: 10.1016/j.nanoso.2024.101160
Swarup Krishna Bhattacharyya , Debarati Biswas , Nidhi Pandey , Suvendu Nandi , Arijit Ghorai , Gayatri Mukherjee , Mahitosh Mandal , Narayan Chandra Das , Susanta Banerjee

This work provides a unique strategy to anchor the individual properties of fluorophores, pharmacophores and receptors in a single platform using a copper-catalyzed azide-alkyne cycloaddition reaction (CuAAC). Notably, this approach counters the long-term dispute associated with the target-specific drug delivery of 5 fluorouracil and its intracellular tracing. Significantly, the luminescence property of the carbon dots (CDs) and the anticancer activity of the 5 fluorouracil drug are well preserved, even after their structural modification. The resulting nano-hybrid conjugate shows good thermal stability, photo-stability and can selectively guide the drug molecule toward cancer cells and remain nontoxic to noncancerous (hFB) cells. The conjugation of folic acid to the nanohybrid surface promoted the folate receptor-facilitated endocytosis to the folate-positive (HeLa) cell lines over the folate-negative (MCF-7) cells, which enhanced cellular uptake and corresponding better cell apoptosis results. Around 18.2% of cell apoptosis (late + early) values were recorded for the folate-conjugated formulation compared to the folate-less formulation (12.3%) and pure 5 FU drug (7.9%) by a flow cytometry study. Cell cycle analysis confirmed that the populations of HeLa cells in the S phase were around 18.20% and 29.8% for the folate-less formulation and the folate-conjugated formulation, indicating all the formulations can hinder the DNA replication and thymidylate synthesis by introducing cell cycle arrest in the S phase, just like the pure 5 FU drug. Also, the location of the drug molecule can be simultaneously traced because of the luminescent nature of the CDs. Therefore, the developed system has potential in target-specific drug delivery and long-term drug molecule tracking applications.

这项工作提供了一种独特的策略,利用铜催化的叠氮-炔烃环加成反应(CuAAC),将荧光团、药团和受体的各自特性锚定在一个平台上。值得注意的是,这种方法解决了与 5 氟尿嘧啶靶向给药及其细胞内追踪相关的长期争议。值得注意的是,碳点(CD)的发光特性和 5 氟尿嘧啶药物的抗癌活性即使在其结构修饰后也得到了很好的保留。由此产生的纳米杂化共轭物具有良好的热稳定性和光稳定性,能选择性地引导药物分子进入癌细胞,并对非癌细胞(hFB)无毒。叶酸与纳米杂化物表面的共轭作用促进了叶酸受体对叶酸阳性(HeLa)细胞株的内吞作用,而不是叶酸阴性(MCF-7)细胞,从而提高了细胞吸收率,相应地改善了细胞凋亡效果。通过流式细胞术研究,与无叶酸制剂(12.3%)和纯 5 FU 药物(7.9%)相比,叶酸结合制剂的细胞凋亡率(晚期+早期)约为 18.2%。细胞周期分析证实,无叶酸制剂和叶酸结合制剂中处于 S 期的 HeLa 细胞数量分别约为 18.20% 和 29.8%,这表明所有制剂都能像纯 5 FU 药物一样,通过使细胞周期停滞在 S 期来阻碍 DNA 复制和胸苷酸合成。此外,由于 CD 的发光特性,还可以同时追踪药物分子的位置。因此,所开发的系统具有靶向给药和长期药物分子追踪应用的潜力。
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引用次数: 0
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