Current Research in Green and Sustainable Chemistry最新文献_第3页

Retraction notice to “Recent advances in polymer hydrogel nanoarchitectures and applications" [Current Research in Green and Sustainable Chemistry 4 (2021) 100143] “聚合物水凝胶纳米结构及其应用的最新进展”撤回通知[绿色与可持续化学研究现状4 (2021)100143]

Q2 Materials Science

Current Research in Green and Sustainable Chemistry

Pub Date : 2025-01-01 DOI: 10.1016/j.crgsc.2025.100479

Christopher Igwe Idumah, Iheoma C. Nwuzor, Raphael Stone Odera

引用次数: 0

Microwave-assisted synthesis of ZSM-5 from blast furnace slag 高炉炉渣微波辅助合成ZSM-5

Q2 Materials Science

Current Research in Green and Sustainable Chemistry

Pub Date : 2025-01-01 DOI: 10.1016/j.crgsc.2025.100455

Nhlanhla Nyembe , Yusuf M. Isa

A rapid hydrothermal synthesis method was employed to prepare a novel Zeolite Socony Mobil-5 (ZSM-5) material impregnated with intrinsic metal alloys (Fe₂O₃, MnO, TiO₂, Cr₂O₃, and NiO). Green chemistry was paired with the synthesis method as a sustainable approach to valorize blast furnace slag (BFS) while addressing the growing demand for high-performance zeolites. This study investigated the role of acid-leached BFS as a precursor and explored the advantages of microwave-assisted hydrothermal synthesis over conventional methods. The synthesis temperature and time were varied to explore their effects on the physicochemical, textural, and structural properties of the synthesized ZSM-5 products, with commercial ZSM-5 serving as a reference material for comparison. The favourable synthesis conditions were found to be 180 °C and 13 h, yielding a crystalline ZSM-5 product characterized by well-defined cubic prism shapes with microsized intergrown rectangular crystals. Furthermore, the synthesized ZSM-5 had a mesoporous structure with an average crystallinity of 52.4 % and a low specific surface area (108.4 m²/g) compared to the reference sample (436.4 m²/g). The use of microwave irradiation significantly reduced the synthesis time and energy consumption while preserving the structural integrity of the zeolite framework. Moreover, the synthesis temperature strongly affected the crystal size, while the synthesis time affected the morphology. However, neither the synthesis temperature nor the synthesis time affected the chemical composition of the products. This study highlighted the potential of BFS as a low-cost, sustainable feedstock for zeolite synthesis and the effectiveness of microwave-assisted methods in improving process efficiency. Further work has been proposed to evaluate the potential use of the synthesized ZSM-5 in industrial applications such as catalysis or adsorption processes.

采用快速水热合成方法制备了一种新型沸石Socony mobile -5 （ZSM-5）材料，该材料浸渍了本质金属合金（Fe2O3、MnO、TiO2、Cr2O3和NiO）。绿色化学与合成方法相结合，作为一种可持续的方法来实现高炉渣（BFS）的增值，同时满足对高性能沸石日益增长的需求。本研究考察了酸浸BFS作为前驱体的作用，并探讨了微波辅助水热合成方法相对于传统方法的优势。通过改变合成温度和时间，探讨其对合成ZSM-5产品的理化、织构和结构性能的影响，并以商品ZSM-5作为对照材料进行比较。最佳的合成条件是180°C和13 h，得到的ZSM-5晶体具有明确的立方棱柱形状和微尺寸的交错生长的矩形晶体。此外，合成的ZSM-5具有介孔结构，平均结晶度为52.4%，比表面积（108.4 m2/g）低于参比样品（436.4 m2/g）。微波辐射的使用大大减少了合成时间和能量消耗，同时保持了沸石骨架的结构完整性。此外，合成温度对晶体尺寸影响较大，而合成时间对形貌影响较大。而合成温度和合成时间对产物的化学组成均无影响。这项研究突出了BFS作为一种低成本、可持续的沸石合成原料的潜力，以及微波辅助方法在提高工艺效率方面的有效性。研究人员建议进一步评估合成的ZSM-5在催化或吸附过程等工业应用中的潜在用途。

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引用次数: 0

2-Aminopyridine as a recyclable catalyst for metal-free synthesis of pyrano[2,3-d]pyrimidine scaffolds 2-氨基吡啶作为无金属合成吡喃[2,3-d]嘧啶支架的可回收催化剂

Q2 Materials Science

Current Research in Green and Sustainable Chemistry

Pub Date : 2025-01-01 DOI: 10.1016/j.crgsc.2024.100444

Farzaneh Mohamadpour

This study focuses on the synthesis of pyrano[2,3-d]pyrimidine structures through a one-pot process without the use of metals. The method employs Knoevenagel-Michael cyclocondensation and utilizes a low-cost, reusable catalyst, 2-aminopyridine. The synthesis of pyrano[2,3-d]pyrimidine structures is achieved by refluxing in ethanol (EtOH). The process allows for the easy production of compounds in large quantities and requires minimal reaction time. This cost-effective method features safe reaction conditions, avoids the need for column chromatography, facilitates easy mixing, and promotes efficient material use. Furthermore, 2-aminopyridine demonstrated excellent stability, being reusable up to four times without significant degradation. This approach is particularly beneficial for addressing environmental issues and fulfilling industrial demands.

本研究的重点是在不使用金属的情况下，通过一锅法合成吡喃[2,3-d]嘧啶结构。该方法采用Knoevenagel-Michael环缩合，并使用一种低成本、可重复使用的催化剂，2-氨基吡啶。吡喃[2,3-d]嘧啶结构的合成是通过乙醇（EtOH）回流实现的。该工艺可以很容易地大量生产化合物，并且需要最短的反应时间。这种具有成本效益的方法具有安全的反应条件，避免了柱层析的需要，便于混合，并促进有效的材料使用。此外，2-氨基吡啶表现出优异的稳定性，可重复使用多达四次而不会明显降解。这种方法对解决环境问题和满足工业需求特别有益。

引用次数: 0

Natural corrosion inhibitors derived from powder, concentrated extract and tannin of ketapang (Terminalia catappa L.) leaves for iron protection in sodium chloride solutions 天然缓蚀剂，从吉打邦（Terminalia catappa L.）叶的粉末、浓缩提取物和单宁中提取，用于氯化钠溶液中的铁保护

Q2 Materials Science

Current Research in Green and Sustainable Chemistry

Pub Date : 2025-01-01 DOI: 10.1016/j.crgsc.2025.100471

Rondang Tambun , Azizul Helmi Bin Sofian , Bode Haryanto , Vikram Alexander , Bryan Tuah Prima , Patricia Rachel Waruwu

Tannin as one of the organic corrosion inhibitors is generally used in the form of pure compounds. This makes the production of tannin inhibitors more complex. The use of tannin inhibitors can be replaced by maintaining the compound in powder or extract form. This study aims to determine the ability of powder, concentrated extract and tannin obtained from ketapang leaves as iron corrosion inhibitors in 3 % sodium chloride (NaCl) solution. The novelty of this study lies in the use of ketapang leaves powder as corrosion inhibitor which has not been previously investigated, as a sustainable and simpler form of corrosion inhibitor to address the challenge. This inhibition process was carried out by considering the amount of inhibitor and the duration of immersion. The addition of 2 % was applied over 2 days, 4 days, 6 days, and 8 days. The corrosion rate of iron plate was calculated using the mass loss method, and then continued with the calculation of the inhibition efficiency. The results obtained on the 8 days showed differences in corrosion rate and inhibition efficiency for each form of inhibitor. The use of ketapang leaves powder gave a corrosion rate of 3.73 mpy and an inhibition efficiency of 84.88 %, the use of concentrated extract gave a corrosion rate of 0.93 mpy and an efficiency of inhibition of 96.22 %, and the use of tannin gave a rate of corrosion of 0.62 mpy and an inhibition efficiency of 97.48 %. Therefore, ketapang leaves can be used in all three form, especially the powder form offering practical that inhibits corrosion of iron.

单宁作为有机缓蚀剂之一，一般以纯化合物形式使用。这使得单宁抑制剂的生产更加复杂。单宁抑制剂的使用可以通过保持粉末或提取物形式的化合物来代替。本研究旨在测定从吉打邦叶中提取的粉末、浓缩提取物和单宁在3%氯化钠（NaCl）溶液中作为铁缓蚀剂的能力。本研究的新颖之处在于使用以前未被研究过的吉打邦叶粉作为缓蚀剂，作为一种可持续的、更简单的缓蚀剂来解决这一挑战。该抑制过程考虑了抑制剂的用量和浸泡时间。2%的添加量分别为2天、4天、6天和8天。先用质量损失法计算铁板的腐蚀速率，然后再计算缓蚀效率。8天的试验结果表明，不同形式的缓蚀剂在腐蚀速率和缓蚀效率方面存在差异。使用吉打邦叶粉的腐蚀速率为3.73 mpy，缓蚀率为84.88%；使用浓缩提取物的腐蚀速率为0.93 mpy，缓蚀率为96.22%；使用单宁的腐蚀速率为0.62 mpy，缓蚀率为97.48%。因此，吉打邦叶可以以所有三种形式使用，特别是粉末形式，具有抑制铁腐蚀的实用性。

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引用次数: 0

Rapid green synthesis of silver nanoparticles and reusable nanocomposite beads using Yerba mate (Ilex paraguariensis) leaves for environmental remediation 利用巴拉圭茶叶片快速绿色合成纳米银粒子和可重复使用纳米复合微珠用于环境修复

Q2 Materials Science

Current Research in Green and Sustainable Chemistry

Pub Date : 2025-01-01 DOI: 10.1016/j.crgsc.2025.100502

Adnan Alsaei , Abdulla Albalooshi , Fatima AlHannan, Ahmed Alaraibi, Fryad Henari, G. Roshan Deen

In this work, silver nanoparticles (AgNPs) were rapidly synthesized by a simple green method using the aqueous extract of Yerba mate (Ym) as a reducing and capping agent. The nanoparticles were characterized by UV–Vis absorption spectroscopy and electron microscopy. A strong surface plasmon resonance (SPR) peak in the range 384 nm–400 nm confirmed the formation of AgNPs. Stable AgNPs were obtained at a low concentration of Ym, and at a high concentration the nanoparticles were unstable due to the formation of aggregates as a result of steric destabilisation. AgNPs loaded sodium alginate nanocomposite beads were synthesized using Ym extract by in-situ reduction and ionotropic crosslinking. The beads were spherical with cauliflower-like morphology consisting of rugged and porous surface with an even distribution of AgNPs with average size of 320 nm. The catalytic property of the beads in the degradation of 2-Nitrophenol (2-Np), Congo red (CR), and methylene blue (MB) at room temperature in the presence of a reducing agent was studied. The degradation efficiency was more than 80 %, and the degradation followed a pseudo-first order reaction kinetics. The 2-Np and CR exhibited two rate constants during the degradation process and this behaviour is attributed to an initial slow surface adsorption followed by rapid degradation. The antibacterial property of the beads against Escherichia coli was studied by the broth and plating methods, and complete inhibition of the bacteria was observed with 5 ± 1 beads.

本研究以马茶叶（Ym）的水提物为还原剂和封盖剂，采用简单的绿色方法快速合成了纳米银颗粒（AgNPs）。采用紫外-可见吸收光谱和电子显微镜对纳米颗粒进行了表征。表面等离子体共振（SPR）峰在384 ~ 400 nm范围内，证实了AgNPs的形成。在低浓度的Ym下可以得到稳定的AgNPs，而在高浓度下，由于空间不稳定而形成聚集体，纳米颗粒不稳定。以Ym提取物为原料，采用原位还原和离子型交联法制备了负载AgNPs的海藻酸钠纳米复合微珠。小球呈球形，呈花椰菜状，表面凹凸不平，多孔，平均尺寸为320 nm， AgNPs分布均匀。在还原剂存在下，研究了微球在室温下对2-硝基苯酚（2-Np）、刚果红（CR）和亚甲基蓝（MB）的催化降解性能。降解效率在80%以上，降解符合准一级反应动力学。2-Np和CR在降解过程中表现出两个速率常数，这种行为归因于最初缓慢的表面吸附和随后的快速降解。采用肉汤法和电镀法研究了微球对大肠杆菌的抑菌性能，5±1个微球对大肠杆菌的抑菌效果为完全抑制。

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引用次数: 0

Enhanced antibacterial activity of Ocimum sanctum leaf extract mediated hydroxyapatite and hydroxyapatite-iron oxide nanocomposites 竹叶提取物介导羟基磷灰石和羟基磷灰石-氧化铁纳米复合材料的抗菌活性增强

Q2 Materials Science

Current Research in Green and Sustainable Chemistry

Pub Date : 2025-01-01 DOI: 10.1016/j.crgsc.2024.100439

M. Rokonozzaman , Kishan Nandi Shoudho , N. Banik , Mehedi Hasan Pritom , M. Ariful Haque , M.K. Alam , N. Begum , Shoeb Ahmed , I.A. Khan , A.S.M. Al Amin , M.N.I. Khan

Hydroxyapatite (HA) is frequently used in a variety of biomedical applications especially in orthopedics and dental because of its outstanding bioactivity and biocompatibility. On the other hand, HA lacks inherent antibacterial properties, shows poor mechanical strength, and infection issues are still one of the main causes of implant failure. Consequently, antibacterial HA may be a potential material for HA applications. For any potential uses of modified hydroxyapatite, such as in medicine or environmental protection, magnetite (Fe₃O₄) may be a crucial element because it has good mechanical properties and is preferred in biomedical systems. Moreover, Fe₃O₄ is biocompatible and basically nontoxic to humans. Therefore, the present study aims to find a novel approach that may improve the antibacterial activity of HA and HA-Fe₃O₄ nanocomposites and provide low toxicity to humans. The synthesized HA and HA -Fe₃O₄ nanocomposites were characterized by XRD, FTIR, SEM, EDX, and Zeta potential analyzer. Moreover, antibacterial activity tests confirmed that the utilization of Ocimum sanctum leaf extract as a reaction medium in HA and HA-Fe₃O₄ nanocomposites synthesis improved antibacterial activity against Escherichia coli and Staphylococcus aureus. This research demonstrates the green synthesis of HA and HA-Fe₃O₄ nanocomposites using Ocimum sanctum leaf extract by hydrothermal method, opening the door for potential applications in biomedical fields.

羟基磷灰石（HA）因其出色的生物活性和生物相容性被广泛应用于各种生物医学领域，特别是骨科和牙科领域。另一方面，HA缺乏固有的抗菌性能，机械强度较差，感染问题仍然是种植体失败的主要原因之一。因此，抗菌透明质酸可能是一种潜在的透明质酸应用材料。对于改性羟基磷灰石的任何潜在用途，例如在医学或环境保护中，磁铁矿（Fe3O4）可能是一个关键元素，因为它具有良好的机械性能，并且在生物医学系统中是首选。此外，Fe3O4具有生物相容性，对人体基本无毒。因此，本研究旨在寻找一种新的方法来提高HA和HA- fe3o4纳米复合材料的抗菌活性，并提供对人体的低毒性。采用XRD、FTIR、SEM、EDX和Zeta电位分析仪对合成的HA和HA -Fe3O4纳米复合材料进行了表征。此外，抗菌活性试验证实，利用菟丝子叶提取物作为反应介质合成HA和HA- fe3o4纳米复合材料可提高其对大肠杆菌和金黄色葡萄球菌的抗菌活性。本研究通过水热法制备了透明质酸和HA- fe3o4纳米复合材料，为生物医学领域的潜在应用打开了大门。

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引用次数: 0

Evaluation of Corynocarpus laevigatus extract as a green corrosion retardant for mild steel in acidic media: A combined gravimetric, gasometric and electrochemical methods 山菖蒲提取物作为酸性介质中低碳钢绿色缓蚀剂的评价：用重量、气相和电化学相结合的方法

Q2 Materials Science

Current Research in Green and Sustainable Chemistry

Pub Date : 2025-01-01 DOI: 10.1016/j.crgsc.2025.100447

Anthony I. Obike , K.S. Eze , Ibrahim Abdel-Rahman , Alexander I. Ikeuba , Izuchukwu K. Nwokolo , Christopher Aghalibe

The corrosion inhibition by the methanolic extract of Corynocarpus laevigatus leaves on mild steel within acidic environments was evaluated utilizing gravimetric, gasometric, and electrochemical methodologies. The findings indicate that the extracts serve as an effective corrosion inhibitor in both H₂SO₄ and HCl aqueous solutions. The extract exhibited optimum inhibition efficiencies of 88.64 %, 71.12 %, and 77.60 % in H₂SO₄, and 88.89 %, 67.96 %, and 85.55 % in HCl, respectively. The inhibition efficiency increased with higher extract concentrations but decreased with increasing temperature and exposure time in both media. Also, the rate of hydrogen evolution increased with rising temperature in both media. Adsorption studies revealed that the inhibitor's average activation energy (Ea) values were 71.23 kJ/mol and 137.59 kJ/mol for H₂SO₄ and HCl media, respectively. The extract followed the Langmuir isotherm model, indicating monolayer adsorption of the phytochemical components onto the mild steel surface. Physical adsorption was dominant in H₂SO₄, as evidenced by decreasing activation energy (Ea) values with increasing temperature. In contrast, chemical adsorption was observed in HCl. The strong adsorption of phytochemicals present in the extract onto the steel surface was identified as the primary mechanism for corrosion inhibition. This study provides valuable insights into the dual adsorption mechanisms of Corynocarpus laevigatus in different acidic media which underscores its potential as a sustainable and effective corrosion inhibitor in acidic environments.

采用重量法、气相法和电化学方法评价了山菖蒲叶甲醇提取物在酸性环境下对低碳钢的缓蚀作用。结果表明，该提取物在H2SO4和HCl水溶液中均能有效抑制腐蚀。该提取物对H2SO4的抑菌率分别为88.64%、71.12%和77.60%，对HCl的抑菌率分别为88.89%、67.96%和85.55%。抑制效果随萃取物浓度的增加而增加，但随温度和暴露时间的增加而降低。在两种介质中，随着温度的升高，析氢速率增加。吸附研究表明，该抑制剂对H2SO4和HCl介质的平均活化能（Ea）分别为71.23 kJ/mol和137.59 kJ/mol。提取液遵循Langmuir等温线模型，表明植物化学成分在低碳钢表面的单层吸附。H2SO4以物理吸附为主，随温度升高活化能（Ea）值降低。相反，在HCl中观察到化学吸附。提取物中植物化学物质在钢表面的强吸附被确定为缓蚀的主要机制。本研究为深入了解山菖蒲在不同酸性介质中的双重吸附机制提供了有价值的见解，强调了其在酸性环境中作为一种可持续有效的缓蚀剂的潜力。

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引用次数: 0

Computational and experimental evaluation of the corrosion inhibition of magnesium in the presence of acids/Esters in saline solutions 盐溶液中酸/酯对镁缓蚀性能的计算和实验评价

Q2 Materials Science

Current Research in Green and Sustainable Chemistry

Pub Date : 2025-01-01 DOI: 10.1016/j.crgsc.2025.100452

Alexander I. Ikeuba , Lubem Aondoakaa , William Azogor , Chigoziri C. Njoku , Brian E. Usibe , Obinna Echem

Some additive compounds that have been noted to boost the performance of Mg batteries are herein investigated for their corrosion inhibition properties and mechanism of action on the Mg surface. Experimentally, hydrogen evolution tests were carried out in the presence and absence of the additives while molecular level computations were carried out using density functional theory (DFT) and molecular dynamic simulations (MDS) to evaluate the adsorption of the additives. These compounds include; analine, histidine, lysine, proline, and arginine, 1,3 2,4 dibenzylidene-sorbitol (DBS), hydroxyacetic acid, ethanedioate, nitrilotriacetic acid (NTAN) and ethylenediaminetetraacetic acid (EDTA). The additives inhibited the corrosion of Mg at different temperatures and additive concentrations. The compounds showed varying inhibition efficiencies at different concentrations of the additives, however at a concentration of 0.1 mg/L of the additives at 303 K, the trend of the inhibition efficiency is Glyocolate > EDTA > NTAN > DBS > Alanine > Histidine > Lysine > Oxalate > Proline > Arginine. The adsorption of the inhibitors were consistent with the langmuir adsorption isotherm and the values of Gibbs free energy of adsorption calculated indicates that the additives are physisorbed on the metal surface. The activation energy in the presence of the additives was higher than that of the blank solution suggesting an increase in the energy barrier needed to drive the corrosion process in the presence of the inhibitors. The Heat of adsorption values were negative and indicate that the adsorption process is exothermic. DFT calculations on the additives indicate that the molecular composition and bi polar nature of the amino acids have a pronounced effect on their adsorption characteristics in addition to the functional groups present. The molecular dynamics simulations indicated that the organic molecules all interact with the metal surface which was the driving force of the adsorption of the compounds on the metal surface.

本文研究了一些被认为可以提高镁电池性能的添加剂化合物在镁表面的缓蚀性能和作用机理。实验上，在添加和不添加添加剂的情况下进行了析氢实验，并利用密度泛函理论（DFT）和分子动力学模拟（MDS）进行了分子水平计算，以评估添加剂的吸附作用。这些化合物包括；苯胺、组氨酸、赖氨酸、脯氨酸和精氨酸、1,3,2,4二苄基山梨醇（DBS）、羟基乙酸、乙二酸酯、硝基三乙酸（NTAN）和乙二胺四乙酸（EDTA）。不同温度和浓度的添加剂对Mg的腐蚀均有抑制作用。各化合物在不同浓度的添加剂下表现出不同的抑制效率，但在303k下，当添加剂浓度为0.1 mg/L时，抑制效率的变化趋势为甘糖酸盐；EDTA祝辞NTAN祝辞星展银行比;丙氨酸在组氨酸在赖氨酸比;草酸比;脯氨酸比;精氨酸。抑制剂的吸附符合langmuir吸附等温线，Gibbs自由能吸附值表明抑制剂在金属表面被物理吸附。添加剂存在时的活化能高于空白溶液的活化能，表明在抑制剂存在时驱动腐蚀过程所需的能垒增加。吸附热值为负，表明吸附过程是放热的。添加剂的DFT计算表明，除了存在的官能团外，氨基酸的分子组成和双极性性质对其吸附特性有显著影响。分子动力学模拟表明，有机分子均与金属表面相互作用，这是化合物在金属表面吸附的驱动力。

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引用次数: 0

Comparison of the performance of various forms of nano carbon as a membrane with the aim of optimal use in water purification and providing a mathematical model to predict membrane behavior 比较不同形式的纳米碳作为膜的性能，以优化其在水净化中的应用，并提供预测膜行为的数学模型

Q2 Materials Science

Current Research in Green and Sustainable Chemistry

Pub Date : 2025-01-01 DOI: 10.1016/j.crgsc.2025.100472

Abdollah Abbasloo , Farshad Farahbod

The growing global population and the provision of safe drinking water have become a major challenge facing the world today. Water shortages are felt in various uses such as drinking, industry, and agriculture, and the need for water consumption is expected to double in the next 25 years according to forecasts. One way to meet the need for water consumption is to use saline water from wells, wastewater, and their treatment. In this study, using laboratory studies, the clogging of various types of nano-membranes including different forms of carbon such as single and multi-walled carbon nanotubes, carbon nanofibers and fullerene (C60) which are used in the water purification process is investigated. Experimental results show that the use of a membrane made with multi-walled carbon nanotubes performs better compared to other forms of carbon and therefore has a more favorable performance in reducing the hardness of the effluent. Experimental results show that the total hardness of the treated water when using a membrane made with multi-walled carbon nanotubes at a constant temperature of 23 °C and a mass of 10 g and a flow rate of 1.87 L per second after 10 days is equal to 210 micro mhos per centimeter. The significance of this research lies in its comprehensive comparison of various carbon-based nano-membranes for water purification and the development of a predictive mathematical model for membrane fouling behavior. By identifying multi-walled carbon nanotubes as the optimal material with superior performance, longevity, and reusability, this study offers a promising solution for enhancing the efficiency and sustainability of membrane-based desalination systems. The findings contribute to addressing the global challenge of water scarcity by advancing nanotechnology applications in environmental engineering.

日益增长的全球人口和提供安全饮用水已成为当今世界面临的主要挑战。饮用水、工业和农业等各种用途都感到缺水，据预测，未来25年用水量将增加一倍。满足用水需求的一种方法是使用井中的盐水、废水及其处理。在本研究中，通过实验室研究，研究了水净化过程中使用的各种类型的纳米膜的堵塞情况，包括不同形式的碳，如单壁碳纳米管和多壁碳纳米管，碳纳米纤维和富勒烯（C60）。实验结果表明，与其他形式的碳相比，使用多壁碳纳米管制成的膜性能更好，因此在降低出水硬度方面具有更有利的性能。实验结果表明，在温度为23℃、质量为10 g、流速为1.87 L / s的条件下，多壁碳纳米管膜处理后的水在10天后的总硬度为210微mhos / cm。本研究的意义在于对各种碳基纳米水净化膜进行了综合比较，并建立了膜污染行为的预测数学模型。通过确定多壁碳纳米管是性能优越、寿命长、可重复使用的最佳材料，本研究为提高膜基海水淡化系统的效率和可持续性提供了一个有前途的解决方案。这些发现通过推进纳米技术在环境工程中的应用，有助于解决水资源短缺的全球挑战。

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引用次数: 0

Anti-dirt hand sanitizer: A zeolite-enhanced approach to hygiene and microbial protection 防脏洗手液：沸石增强的卫生和微生物保护方法

Q2 Materials Science

Current Research in Green and Sustainable Chemistry

Pub Date : 2025-01-01 DOI: 10.1016/j.crgsc.2025.100473

Theo Uskoković , Evangelina Uskoković , Victoria Wu , Vuk Uskoković

Children love to play with dirt and their outdoor activities oftentimes make their hands heavily soiled. Meanwhile, improper sanitation of the hands prior to making contact with food or bodily fluids can result in potentially dangerous infection. In situations where handwashing is not available, hand sanitizers present a common cleaning agent of choice. However, as it is shown here, standard sanitizers, albeit acting effectively against skin microbes, do not have the ability to remove the dirt deposits off children's hands, where microbial colonies may remain protected against the antiseptic effect of the sanitizer. To circumvent this limitation, we designed and synthesized an antimicrobial hand sanitizer gel capable of removing such dirt deposits. This novel form of the hand sanitizer was created by adding a low-silica zeolite (M_y^z+[Si_1-xAl_xO₂]^x− {x = 0.375, x = yz}) zeolite, a common environmental remediation agent, in three different weight fractions (1, 5 and 10 wt%) to the base formulation containing ethanol and water at different volume ratios (60:40 and 70:30 v/v), alongside methylcellulose as the gelling agent and glycerin as the humectant. The dirt-removal efficiency of zeolite-containing formulations was significantly higher than that of the zeolite-free formulations and directly proportional to the amount of zeolite dispersed in them. Antibacterial assays demonstrated the evident antiseptic effect of all the formulations against cultivable bacteria sampled from the soiled hands. Fundamental and practical findings shared here can aid in the design of an anti-dirt hand sanitizer for the prevention of exposure of both pediatric and general populations to obligate or opportunistic pathogens residing in various environmental sources.

孩子们喜欢玩脏东西，他们的户外活动经常使他们的手弄脏。与此同时，在接触食物或体液之前不适当的手部卫生可能导致潜在的危险感染。在不能洗手的情况下，洗手液是一种常用的清洁剂。然而，正如这里所显示的，标准的洗手液，虽然对皮肤微生物有效，但不能去除孩子手上的污垢，那里的微生物菌落可能仍然受到保护，不受洗手液的杀菌作用的影响。为了规避这一限制，我们设计并合成了一种能够去除这些污垢沉积物的抗菌洗手液凝胶。这种新型洗手液是通过将低硅沸石（Myz+[Si1-xAlxO2]x−{x = 0.375, x = yz}）沸石（一种常见的环境修复剂）以三种不同的重量分数（1、5和10 wt%）添加到含有不同体积比（60:40和70:30 v/v）的乙醇和水的基础配方中，以及甲基纤维素作为胶凝剂和甘油作为湿润剂而制成的。含沸石配方的除污效率显著高于无沸石配方，且与沸石的分散量成正比。抗菌试验表明，所有配方对从污染的手上采集的可培养细菌都有明显的抗菌效果。这里分享的基本和实际发现可以帮助设计一种防脏洗手液，以防止儿童和一般人群暴露于各种环境来源的专性或机会性病原体。

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引用次数: 0