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Selectivity control in catalytic glucose dehydration using iron- and tungsten-modified ZSM-5 catalysts 使用铁和钨改性 ZSM-5 催化剂催化葡萄糖脱水的选择性控制
IF 7.1 3区 材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Pub Date : 2024-10-02 DOI: 10.1016/j.mtsust.2024.101005
Thawanrat Kobkeatthawin , Nuttapat Thiensuwan , Atikhun Chotirattanachote , Supphathee Chaowamalee , Chawalit Ngamcharussrivichai
The conversion of lignocellulosic biomass into valuable chemicals and fuels has received considerable attention owing to the issues related to global warming. 5-Hydroxymethylfurfural (HMF) is a versatile lignocellulose-derived platform chemical used in a wide range of high-value bioproducts. However, the HMF production is completed with polymerization by which humins are inevitably formed as a by-product. Recently, the potential of humins for various applications has been explored. In this study, a series of ZSM-5 zeolite catalysts modified with iron (Fe) and tungsten (W) were used to selectively control glucose dehydration to HMF and humins. The zeolite catalysts possessing tunable bifunctional Brønsted–Lewis acid characteristics were prepared through pretreatment using a diluted nitric acid solution, followed by metal impregnation. The impregnation of Fe into ZSM-5 induced the formation of highly dispersed extraframework isolated Fe3+ ions and Fe2O3 species, which increased the content of Lewis acid sites. The W species added to ZSM-5 existed in the form of Si–OH–W linkages and polytungstates with moderate-to-strong Brønsted acidity. The selective synthesis of HMF was efficiently performed over the Fe-modified ZSM-5 catalysts. Furthermore, the W-modified catalysts exhibited potential application as novel catalysts for the selective production of humins. The controlled selectivity to each product depended on the acidic properties and Lewis/Brønsted acidity ratio of the catalysts as well as the transition metal-dependent characteristics of the Brønsted and Lewis acid sites.
由于与全球变暖有关的问题,将木质纤维素生物质转化为有价值的化学品和燃料受到了广泛关注。5-Hydroxymethylfurfural (HMF) 是一种多功能的木质纤维素衍生平台化学品,可用于多种高价值生物产品。然而,HMF 的生产是在聚合过程中完成的,聚合过程中不可避免地会产生副产品腐植质。最近,人们开始探索腐植酸的各种应用潜力。在本研究中,使用铁(Fe)和钨(W)修饰的一系列 ZSM-5 沸石催化剂选择性地控制葡萄糖脱水生成 HMF 和腐植酸。通过使用稀硝酸溶液进行预处理,然后进行金属浸渍,制备出具有可调双官能度布伦斯特-刘易斯酸特性的沸石催化剂。在 ZSM-5 中浸渍 Fe 会形成高度分散的框架外孤立 Fe3+ 离子和 Fe2O3 物种,从而增加路易斯酸位点的含量。添加到 ZSM-5 中的 W 物种以 Si-OH-W 链接和多钨酸盐的形式存在,具有中等至强的布氏酸性。在 Fe 改性的 ZSM-5 催化剂上可以高效地进行 HMF 的选择性合成。此外,W 改性催化剂作为选择性生产腐植酸的新型催化剂也具有潜在的应用价值。对每种产品的可控选择性取决于催化剂的酸性和路易斯/布氏酸度比,以及布氏酸和路易斯酸位点的过渡金属依赖特性。
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引用次数: 0
Research progress of solar thermal evaporation materials and systems 太阳能热蒸发材料和系统的研究进展
IF 7.1 3区 材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Pub Date : 2024-10-02 DOI: 10.1016/j.mtsust.2024.101002
Cheng Xue , Zhanpeng Yu , Cong Qi, Maoqing Tang
Solar energy is a kind of clean energy, and the efficient usage of solar energy can effectively alleviate the challenges of lacking energy source and environment pollution, and also plays an important role in the process of realizing carbon peak and carbon neutral. For the last few years, growing maturity of the photothermal conversion technology, great breakthroughs have been achieved in the desalination field using solar energy. This paper mainly summarized the development trend of carbon-based materials, metal materials, semiconductor materials and efficient photothermal conversion technology in solar thermal evaporation systems, and analyzed the main problems in the field of photothermal conversion, such as huge cost, low efficiency and small scope of application. By comparing different kinds of photothermal conversion materials and methods, it provides useful guidance and development direction for the design of high-efficiency photothermal conversion devices in the field of photothermal conversion and seawater evaporation.
太阳能是一种清洁能源,高效利用太阳能可以有效缓解能源匮乏和环境污染的挑战,在实现碳峰值和碳中和的过程中也发挥着重要作用。近几年来,光热转换技术日趋成熟,在利用太阳能进行海水淡化领域取得了重大突破。本文主要总结了太阳能热蒸发系统中碳基材料、金属材料、半导体材料和高效光热转换技术的发展趋势,分析了光热转换领域存在的成本高、效率低、应用范围小等主要问题。通过比较不同种类的光热转换材料和方法,为光热转换和海水蒸发领域高效光热转换装置的设计提供了有益的指导和发展方向。
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引用次数: 0
A semi-conductive rigid polyurethane foam derived from kraft lignin polyol and a PEDOT: PSS coating 一种半导电硬质聚氨酯泡沫,由牛皮纸木质素多元醇和 PEDOT:PSS 涂层
IF 7.1 3区 材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Pub Date : 2024-10-02 DOI: 10.1016/j.mtsust.2024.101003
Fernanda R. Vieira , Sílvia Soreto Teixeira , Denis Alikin , Luís Cadillon Costa , Nuno Gama , Ana Barros-Timmons , Andrei Kholkin , Dmitry V. Evtuguin , Paula C.R. Pinto
Rigid polyurethane foams (RPUF) are mainly used as thermal insulators materials. These materials are drawing the attention of the emerging sector of the Internet of Things (IoT) due to their features such as good chemical resistance, lightweight, and tunable mechanical properties. Yet, for IoT applications, the electrical conductivity of this type of materials should be increased substantially. To address this challenge, as well as the urgency to use renewable and sustainable resources, semi-conductive RPUF were synthesized using crude lignin-based polyol (LBP) doped with multi-walled carbon nanotubes (MWCNT) and coated with PEDOT: PSS, using the dip coating technique. The ensuing semi-conductive RPUF has low density (33–34 kg/m3), high electrical conductivity (in the order of magnitude of 10−5 S/m), and a stretchability enhancement of almost 50 % upon coating with PEDOT: PSS. Furthermore, the mechanical performance of RPUFs can be adjusted using MWCNT and fine tuning of the formulation. Lignin being an abundant natural aromatic polyol allows the partial replacement of fossil derived polyols in the production of RPUFs and its aromatic structure contributes to the thermal and mechanical stability of the ensuing foams.
硬质聚氨酯泡沫(RPUF)主要用作隔热材料。这些材料具有良好的耐化学性、重量轻和可调整的机械性能等特点,因此备受新兴物联网(IoT)领域的关注。然而,对于物联网应用而言,这类材料的导电性应大幅提高。为了应对这一挑战以及利用可再生和可持续资源的紧迫性,我们使用掺杂了多壁碳纳米管(MWCNT)的粗木质素基多元醇(LBP)合成了半导电 RPUF,并在其表面涂覆了 PEDOT:PSS 涂层。随后制成的半导电 RPUF 密度低(33-34 kg/m3),导电率高(10-5 S/m 数量级),在涂覆 PEDOT: PSS 后拉伸性几乎提高了 50%:PSS 涂层后,拉伸性提高了近 50%。此外,RPUF 的机械性能可通过使用 MWCNT 和微调配方来调整。木质素是一种丰富的天然芳香多元醇,可在 RPUF 的生产过程中部分替代化石衍生的多元醇,其芳香结构有助于提高泡沫的热稳定性和机械稳定性。
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引用次数: 0
ZnO/nZVI nanoparticle-enhanced double-slope U-shaped solar distillation: A thermodynamic investigation of cephalexin adsorption ZnO/nZVI 纳米粒子增强型双斜 U 型太阳能蒸馏:头孢氨苄吸附的热力学研究
IF 7.1 3区 材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Pub Date : 2024-10-01 DOI: 10.1016/j.mtsust.2024.100983
A. Sangeetha , S. Shanmugan , Abdulaziz Alasiri
The increasing need for sustainable methods to remove pharmaceutical contaminants like cephalexin and improve water desalination is critical. This study explores ZnO/nZVI nanoparticles synthesized with Jackfruit peel extracts as eco-friendly, cost-effective adsorbents, enhancing water purification in solar desalination systems. This work used a matte black paint coating within a double slope U-shaped solar distiller (DSUD) in a discontinuous experimental setting to examine potential improvements in solar distillation performance. Activated carbon (AC) and bioactive powdered nanoparticles of ZnO/nZVI (nano zerovalent iron), produced from jackfruit peel extracts (JP) were combined in a synergistic way. The effectiveness of cephalexin removal was assessed taking into account the JPAC solution parameters, reaction duration, ZnO/nZVI concentrations in the nanocomposite dosage, and initial nanocomposite concentration. The best conditions for cephalexin adsorption were found to be pH 5 and reaction time of 50 min, which resulted in high absorption efficiencies of 94.74% (nZVI) and 97.53% (ZnO) at room temperature with a JPAC dose of 2.50 g L⁻1. The efficiency of the eco-friendly adsorbent in getting rid of cephalexin was calculated using “pseudo-second-order kinetics” for nanocomposites, which is consistent with the “Langmuir” isothermal absorption process. The nanocomposites as absorbent materials in solar thermal desalination processes, efficient heat transmission and energy storage have been established. JPAC and the addition of steel balls (S) with a silver hue to the DSUD improved the internal heat transfer mechanisms. Thermodynamic of Gibbs free energy and the Laplacian method (TGL), two thermodynamic concepts, were used to extensively study the temperature dynamics of the DSUD with SJPAC components. For ZnO/JPAC, an exceptional distillate production rate was noted from 8:00 to 18:00, with a noteworthy 4.932 L/m2 output in winter and 5.833 L/m2 per day in summer. Using silver balls, ZnO/JPAC generated significant yields over a 24-h period: 8.957 L/m2 in summer and 7.253 L/m2 in winter, with an ideal energy efficiency of 51.05%. The unique advancements in TGL procedures and their environmental consequences are presented in this paper. The field of thermal energy transduction will advance if silver balls are used in DSUD for the synthesis of JPAC, ZnO/JPAC, and nZVI/JPAC, as supported by the theoretical insights presented here.
去除头孢氨苄等药物污染物和改善海水淡化对可持续方法的需求与日俱增。本研究探讨了用柚子皮提取物合成的 ZnO/nZVI 纳米粒子,将其作为生态友好、经济高效的吸附剂,提高太阳能海水淡化系统的水净化效果。这项研究在不连续的实验环境中,在双斜坡 U 型太阳能蒸馏器(DSUD)内使用了哑光黑色涂料涂层,以检验太阳能蒸馏性能的潜在改进。活性炭(AC)和从柚子皮提取物(JP)中提取的具有生物活性的粉末状纳米 ZnO/nZVI(纳米零价铁)以协同增效的方式结合在一起。考虑到 JPAC 溶液参数、反应持续时间、纳米复合材料用量中 ZnO/nZVI 的浓度以及纳米复合材料的初始浓度,对头孢氨苄的去除效果进行了评估。结果发现,pH 值为 5、反应时间为 50 分钟是头孢氨苄的最佳吸附条件,在室温下,当 JPAC 剂量为 2.50 g L-1 时,吸收效率高达 94.74%(nZVI)和 97.53%(ZnO)。利用纳米复合材料的 "伪二阶动力学 "计算了环保吸附剂去除头孢氨苄的效率,这与 "朗缪尔 "等温吸收过程一致。纳米复合材料作为吸收材料在太阳能热脱盐过程中的高效传热和储能作用已经确立。JPAC 和在 DSUD 中添加银色钢球 (S) 改善了内部传热机制。吉布斯自由能热力学和拉普拉斯法(TGL)这两个热力学概念被用来广泛研究含有 SJPAC 成分的 DSUD 的温度动态。就 ZnO/JPAC 而言,从 8:00 到 18:00,蒸馏物的生产率非常高,值得注意的是,冬季每天的产量为 4.932 升/平方米,夏季为 5.833 升/平方米。通过使用银球,ZnO/JPAC 在 24 小时内产生了可观的产量:夏季为 8.957 升/平方米,冬季为 7.253 升/平方米,理想能效为 51.05%。本文介绍了 TGL 程序的独特进步及其对环境的影响。如果在 DSUD 中使用银球合成 JPAC、ZnO/JPAC 和 nZVI/JPAC,热能传导领域将得到进一步发展,本文提出的理论见解也为这一点提供了支持。
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引用次数: 0
Ab initio methods applied to carbon-containing defects in hexagonal boron nitride 应用于六方氮化硼含碳缺陷的 Ab initio 方法
IF 7.1 3区 材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Pub Date : 2024-09-30 DOI: 10.1016/j.mtsust.2024.100988
Ao Wu , Danis I. Badrtdinov , Woncheol Lee , Malte Rösner , Cyrus E. Dreyer , Maciej Koperski
The functionalities activated by defect centers in solids are constantly growing, opening new avenues for sustainable future technologies. These may extend to quantum optoelectronics if suitable defect centers are created and their properties understood. Recent progress in developing quantum emitters in hexagonal boron nitride (hBN) associated with carbon impurities enabled the realization of such concepts in atomically thin films, where the defect centers exhibit an unprecedented level of sensitivity toward the environment. The complexity of defects, together with new control knobs provided by van der Waals technology, poses a challenge for theory to accurately predict the properties of defect centers and to match them with experimental results. Here, we review the ab initio methods applied to carbon-containing defect centers in hBN, exploring the predictive capabilities of different levels of theory for their structural and optoelectronic properties.
由固体缺陷中心激活的功能不断增加,为未来可持续技术开辟了新途径。如果能创造出合适的缺陷中心并了解其特性,这些功能可能会扩展到量子光学。最近在六方氮化硼(hBN)与碳杂质的量子发射器的开发方面取得的进展,使这种概念得以在原子薄膜中实现,其中的缺陷中心对环境的敏感性达到了前所未有的水平。缺陷的复杂性以及范德瓦耳斯技术提供的新控制旋钮,对理论准确预测缺陷中心的特性并使之与实验结果相匹配提出了挑战。在此,我们回顾了应用于氢化硼中含碳缺陷中心的 ab initio 方法,探索了不同理论水平对其结构和光电特性的预测能力。
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引用次数: 0
Green synthesis of cobalt oxide nanoparticles (Co3O4NPs): Characterization and green light-driven photocatalytic aerobic oxidation of alkyl and aryl sulfides to the corresponding sulfoxides 氧化钴纳米颗粒(Co3O4NPs)的绿色合成:烷基和芳基硫化物的表征和绿光驱动的光催化有氧氧化成相应的硫氧化物
IF 7.1 3区 材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Pub Date : 2024-09-29 DOI: 10.1016/j.mtsust.2024.100997
Dana A. Kader
In recent years, cobalt oxide nanoparticles (Co3O4NPs) have garnered significant attention due to their unique properties and wide range of applications, particularly in catalysis and environmental remediation. This study focuses on the green synthesis of Co3O4NPs using garlic extract as a bio-reducing and stabilizing agent, marking the first instance of employing this eco-friendly and cost-effective method. The synthesized nanoparticles were characterized using various techniques including SEM, EDX, FTIR, XRD, UV–Vis DRS, and BET analysis, revealing their spherical morphology, elemental composition, surface area, and optical properties. The primary application investigated was the photocatalytic aerobic oxidation of alkyl and aryl sulfides to sulfoxides under visible green light irradiation. The study meticulously optimized the reaction conditions, evaluating the effects of different solvents, light sources, and catalyst dosages. The optimal conditions were found to be a MeCN:H2O (5:1) solvent system, green LED light (535 nm), and 10 mg of Co3O4NPs catalyst with the highest TON of 12.5. Under these conditions, the catalyst demonstrated high efficiency, achieving up to 95% yield of sulfoxides with various substrates. Furthermore, the reusability of the Co3O4NPs was assessed through multiple catalytic cycles, showing excellent stability and consistent performance. Mechanistic studies indicated that the photocatalytic activity involves the generation of reactive oxygen species (ROS) such as superoxide anion radicals (O2.-) and singlet oxygen (1O2), with both holes and electrons playing crucial roles in the oxidation process. This research highlights the potential of green synthesized Co3O4NPs as effective and sustainable photocatalysts for selective oxidation reactions, offering a promising approach for environmentally benign chemical processes. The findings pave the way for further exploration of bio-derived catalysts in various industrial applications, promoting greener and more sustainable practices in chemical synthesis.
近年来,氧化钴纳米粒子(Co3O4NPs)因其独特的性质和广泛的应用而备受关注,尤其是在催化和环境修复方面。本研究的重点是利用大蒜提取物作为生物还原剂和稳定剂,绿色合成 Co3O4NPs,这是首次采用这种环保且经济高效的方法。合成的纳米粒子采用各种技术进行表征,包括 SEM、EDX、FTIR、XRD、UV-Vis DRS 和 BET 分析,揭示了它们的球形形态、元素组成、表面积和光学特性。研究的主要应用是在可见绿光照射下将烷基和芳基硫化物光催化有氧氧化成硫醚。研究对反应条件进行了细致的优化,评估了不同溶剂、光源和催化剂用量的影响。结果发现,最佳条件为 MeCN:H2O (5:1) 溶剂系统、绿色 LED 光(535 纳米)和 10 毫克 Co3O4NPs 催化剂,最高吨位为 12.5。在这些条件下,催化剂表现出很高的效率,各种底物的硫氧化物产率高达 95%。此外,通过多次催化循环对 Co3O4NPs 的可重复使用性进行了评估,结果表明其稳定性极佳,性能稳定。机理研究表明,光催化活性涉及活性氧(ROS)的生成,如超氧化物阴离子自由基(O2.-)和单线态氧(1O2),空穴和电子在氧化过程中起着关键作用。这项研究凸显了绿色合成 Co3O4NPs 作为选择性氧化反应的有效和可持续光催化剂的潜力,为环境友好型化学过程提供了一种前景广阔的方法。研究结果为进一步探索生物衍生催化剂在各种工业应用中的应用铺平了道路,促进了化学合成中更环保、更可持续的实践。
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引用次数: 0
Prediction of state-of-health of lithium-ion battery based on CEEMDAN-SG-LSTM combined model 基于 CEEMDAN-SG-LSTM 组合模型的锂离子电池健康状况预测
IF 7.1 3区 材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Pub Date : 2024-09-29 DOI: 10.1016/j.mtsust.2024.100999
Xu Li, Huilin Yu, Jianchun Wang, Yuhang Xia, Haotian Zheng, Hongzheng Song
State-of-health (SOH) is an important indicator for the maintenance and safe operation of batteries, and it is crucial for accurately predicting SOH. To address problems that the noise present in the original data lead to inaccurate prediction results. An Long-Short-Term-Memory (LSTM) method for SOH prediction is proposed based on the joint noise reduction model of complete ensemble empirical mode decomposition adaptive noise (CEEDMAN) and Savitzky-Golay (SG) filtering. Firstly, seven health indicators (HIs) were extracted by analyzing the voltage and current curves, and HIs with higher correlation with SOH were selected using Pearson correlation coefficient. Then, Intrinsic Mode Functions (IMF) components generated from SOH by CEEMDAN are divided into noise-component, noise-dominant-component, useful-signal-dominant-component, filtered noise-dominant-component and useful-signal-dominant-component are reconstructed into filtered SOH. Finally, the LSTM model is used for SOH prediction. Experiments show that proposed model captures the capacity regeneration phenomenon well with high prediction accuracy, and errors are all below 1.9%.
电池健康状态(SOH)是电池维护和安全运行的重要指标,准确预测电池健康状态至关重要。为了解决原始数据中存在的噪声导致预测结果不准确的问题。基于完整集合经验模式分解自适应噪声(CEEDMAN)和萨维茨基-戈莱(SG)滤波的联合降噪模型,提出了一种用于 SOH 预测的长短期记忆(LSTM)方法。首先,通过分析电压和电流曲线提取了七个健康指标(HIs),并利用皮尔逊相关系数选出了与 SOH 相关性较高的 HIs。然后,将 CEEMDAN 从 SOH 中生成的本征模式函数(IMF)分量分为噪声分量、噪声主导分量、有用信号主导分量、滤波噪声主导分量和有用信号主导分量,并将其重建为滤波 SOH。最后,利用 LSTM 模型进行 SOH 预测。实验表明,所提出的模型能很好地捕捉容量再生现象,预测精度高,误差均低于 1.9%。
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引用次数: 0
Towards circularity of plastics: A materials informatics perspective 实现塑料的循环利用:材料信息学视角
IF 7.1 3区 材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Pub Date : 2024-09-27 DOI: 10.1016/j.mtsust.2024.101001
Dawn Sivan , Saima Zafar , R.V. Rohit , Vipin Raj R. , K. Satheeshkumar , Veena Raj , Kohbalan Moorthy , Izan Izwan Misnon , Seeram Ramakrishna , Rajan Jose
Plastic pollution and the associated adversities have been intensively researched recently, providing ample solutions with diverse possibilities and yielding a considerable corpus of literature in plastic waste management (PWM). Regardless of the vast range of techniques formulated, such as mechanical recycling and chemical depolymerization, many of these approaches have limitations including significant costs, ecological threats, and inefficiencies in handling diverse plastic types. Manual analysis of these challenges and the reported solutions from the vast collection of interdisciplinary research papers is extremely laborious. Herein, using tools of data science to create a network of ∼350,000 papers and subsequent clustering to identify various protocols for PWM and determining the main paths of their knowledge evolution, we review their progress. The broad objective of this analysis is to provide a comprehensive understanding of different PWM techniques, with a focus on the importance of integrated, technologically advanced, and environmentally conscious approaches to solve plastic pollution. We identify four major categories of PWM (physical, chemical, physio-chemical, and biological) and analyze their mechanistic details. Our study highlights the critical need for the establishment of more sustainable PWM methodologies, supporting the integration of artificial intelligence to refine process optimization and cultivate interdisciplinary collaboration focused on advancing a circular economy and reducing plastic waste. Together with a deep discussion on the gaps between the set goals and the current achievements identified, these analyses could be a useful tool to confront the PW crisis.
近来,人们对塑料污染及其相关问题进行了深入研究,提供了大量具有各种可能性的解决方案,并产生了大量有关塑料废物管理(PWM)的文献。尽管制定了大量技术(如机械回收和化学解聚),但其中许多方法都存在局限性,包括成本高昂、生态威胁以及处理不同类型塑料的效率低下。对这些挑战和大量跨学科研究论文中报告的解决方案进行人工分析非常费力。在此,我们利用数据科学工具创建了一个由 35 万篇论文组成的网络,并随后进行了聚类,以识别 PWM 的各种协议,并确定其知识演变的主要路径,从而回顾其进展情况。这项分析的总体目标是全面了解不同的公共工程管理技术,重点关注综合、技术先进和具有环保意识的方法对解决塑料污染问题的重要性。我们确定了 PWM 的四大类别(物理、化学、物理化学和生物),并对其机理细节进行了分析。我们的研究强调,迫切需要建立更具可持续性的公共工程管理方法,支持人工智能的整合,以完善流程优化,并培养跨学科合作,重点推进循环经济,减少塑料垃圾。在深入讨论既定目标与当前成果之间的差距的同时,这些分析可以成为应对公共工程危机的有用工具。
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引用次数: 0
Enhanced dopamine detection using Ti3C2Tx/rGO/Pt ternary composite synthesized via microwave-assisted hydrothermal method 利用微波辅助水热法合成的 Ti3C2Tx/rGO/Pt 三元复合材料提高多巴胺检测能力
IF 7.1 3区 材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Pub Date : 2024-09-26 DOI: 10.1016/j.mtsust.2024.100996
Farah Ezzah Ab Latif , Arshid Numan , Nabisab Mujawar Mubarak , Mohammad Khalid , Muhammad Amirul Aizat Mohd Abdah , Weng Pin Wong
A novel electrochemical sensing platform for dopamine (DA) detection was developed by fabricating the ternary composite of Ti3C2Tx MXene (M) and reduced graphene oxide (rGO) with platinum nanoparticles (Pt NPs) through microwave-assisted hydrothermal heating. The exceptional electrical conductivity and rich surface chemistry of MXene provide abundant active catalytic sites for electrochemical reactions, while the large surface area of rGO facilitates ion and electron pathways. The integration of rGO in the MXene sheet, forming MXene-rGO (M_rGO) heterostructure composite, imparts long-term stability to the 2D heterostructure while providing additional electron pathways and significantly enhancing conductivity. Pt NPs synergistically increased the electrocatalytic activity of the electrochemical sensor's performance. Ternary nanocomposites were fabricated with different weight percentages (wt.%) of Pt NPs, ranging from 5 to 20. Characterizations of the samples (rGO, M, M_rGO, and 5–20 wt% Pt@M_rGO) were conducted through X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX), Raman spectroscopy (RAMAN), and X-ray spectroscopy (XPS). Electrochemical evaluations of the samples were investigated in 0.1 M phosphate buffer solution (PBS) using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) analyses. The analysis revealed that the ternary composite with 5 wt% of Pt NPs (5% Pt@M_rGO) exhibited a uniform well-distribution of Pt NPs and the highest oxidation peak for DA oxidation in CV studies. The presence of metal nanoparticles, aided by the synergistic effects between the MXene and rGO, resulted in an excellent DA sensor with a 0.147 μM detection limit from 1 to 14 μM linearity range. The sensor demonstrated outstanding selectivity, reproducibility (RSD values of 8.10%), repeatability (RSD value of 2.46%) and, excellent stability over 14 days. In human urine samples, the sensor exhibited excellent DA recovery (88.62–110.65%). This study significantly advances the development of electrochemical sensors for DA detection by introducing a rapid, facile and, efficient method for fabricating ternary composites. The fabricated sensor exhibited high sensitivity, excellent selectivity, and robust electrochemical performance, offering valuable insights into human and behavioral health advancements.
通过微波辅助水热法制造了 Ti3C2Tx MXene(M)和还原型氧化石墨烯(rGO)与铂纳米颗粒(Pt NPs)的三元复合材料,从而开发了一种新型多巴胺(DA)检测电化学传感平台。MXene 的优异导电性和丰富的表面化学性质为电化学反应提供了丰富的活性催化位点,而 rGO 的大表面积则为离子和电子通路提供了便利。将 rGO 集成到 MXene 片材中,形成 MXene-rGO (M_rGO)异质结构复合材料,为二维异质结构带来了长期稳定性,同时提供了额外的电子通路并显著提高了导电性。铂氮氧化物协同提高了电化学传感器的电催化活性。三元纳米复合材料的铂氮氧化物重量百分比(wt.%)从 5 到 20 不等。通过 X 射线衍射 (XRD)、场发射扫描电子显微镜 (FESEM)、能量色散 X 射线光谱 (EDX)、拉曼光谱 (RAMAN) 和 X 射线光谱 (XPS) 对样品(rGO、M、M_rGO 和 5-20 wt% Pt@M_rGO)进行了表征。在 0.1 M 磷酸盐缓冲溶液(PBS)中,使用循环伏安法(CV)和微分脉冲伏安法(DPV)分析对样品进行了电化学评估。分析表明,含有 5 wt% Pt NPs 的三元复合材料(5% Pt@M_rGO)显示出均匀的 Pt NPs 分布,在 CV 研究中,DA 氧化的氧化峰最高。在 MXene 和 rGO 的协同作用下,金属纳米粒子的存在使得 DA 传感器的线性范围从 1 μM 到 14 μM,检出限为 0.147 μM。该传感器具有出色的选择性、可重复性(RSD 值为 8.10%)、可重复性(RSD 值为 2.46%)和 14 天的出色稳定性。在人体尿液样本中,该传感器表现出卓越的 DA 回收率(88.62%-110.65%)。这项研究通过引入一种快速、简便、高效的三元复合材料制造方法,极大地推动了 DA 检测电化学传感器的发展。所制造的传感器具有高灵敏度、出色的选择性和稳健的电化学性能,为人类和行为健康的进步提供了宝贵的见解。
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引用次数: 0
Graphene oxide-containing chitosan@HKUST-1 beads with increased chemical stability for CO2 capture 用于二氧化碳捕集的含氧化石墨烯壳聚糖@HKUST-1 珠子具有更高的化学稳定性
IF 7.1 3区 材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Pub Date : 2024-09-26 DOI: 10.1016/j.mtsust.2024.100998
Y. Khadiri , A. Legrand , C. Volkringer , A. Anouar , S. Royer , A. El Kadib , T. Loiseau , J. Dhainaut
HKUST-1 MOF was crystallized within chitosan matrix to form xerogel beads using an in-situ growth approach. Under mild conditions, CS@HKUST-1 xerogel beads exhibit high specific surface areas (SBET) up to 923 m2 g−1. By further incorporating graphene oxide (GO) to form ternary CS-GO@HKUST-1 xerogel beads, the HKUST-1 MOF structure remained stable for up to two days in a water solution at room temperature, whereas the MOF powder and CS@HKUST-1 xerogel beads underwent significant framework collapse within a day. CO2 adsorption measurements on these xerogel beads also show promising CO2 uptakes, surpassing 2.5 mmol g−1 at 298 K and 1 bar. Moreover, these composites could be regenerated for more than 10 cycles without any loss of quantity adsorbed.
采用原位生长方法,HKUST-1 MOF 在壳聚糖基质中结晶形成了异凝胶珠。在温和的条件下,CS@HKUST-1 xerogel 珠子表现出高比表面积(SBET),最高可达 923 m2 g-1。通过进一步加入氧化石墨烯(GO)形成三元 CS-GO@HKUST-1 xerogel 珠,HKUST-1 MOF 结构在室温下的水溶液中可保持稳定长达两天,而 MOF 粉末和 CS@HKUST-1 xerogel 珠则在一天内发生明显的框架坍塌。在这些异凝胶珠上进行的二氧化碳吸附测量也显示出良好的二氧化碳吸附能力,在 298 K 和 1 bar 条件下,吸附量超过 2.5 mmol g-1。此外,这些复合材料可以再生 10 次以上,而吸附量不会有任何损失。
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引用次数: 0
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Materials Today Sustainability
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