Colloids and Surfaces C: Environmental Aspects最新文献_第4页

Solid transformation synthesis of zeolites and their applications 沸石的固体转化合成及其应用

Colloids and Surfaces C: Environmental Aspects

Pub Date : 2025-02-27 DOI: 10.1016/j.colsuc.2025.100063

Wei Shu , Haowen Lin , Xintong Chen , Yi Yang , Zhicong Chen , Minyi Liu , Xintong You , Ying Li

Zeolites have been widely studied due to their excellent adsorption and catalytic properties. However, the single microporous structure of traditional zeolites limits their reaction activity and selectivity. Hierarchical zeolites effectively overcome these limitations and enhance the mass transfer and heat transfer, increasing their applicability and stability. Hierarchical zeolites are prepared by two typical strategies including "bottom-up" and "top-down" strategies. However, these strategies usually require high energy consumption, long preparation processes, and generate acidic and alkaline waste. Solid transformation synthesis offers an efficient and green route for hierarchical zeolite preparation. Hierarchical zeolites can enhance activity and/or selectivity in catalysis (e.g. MTO and MTG reactions) and adsorption (e.g. VOCs, methylene blue removal) compared to traditional microporous zeolites. This review aims to illustrate the state-of-art development of hierarchical zeolites synthesized by solid transformation methods, concerning their production and application. Hierarchical zeolite synthesized by solid transformation method has shown promising potential in many fields, such as environmental remediation, catalysis production, energy storage and so on. Therefore, it is of great significance to pave its way to the practical application, and their synthetic conditions and structural changes are worth further investigation.

沸石因其优异的吸附和催化性能而受到广泛的研究。然而，传统沸石的单一微孔结构限制了其反应活性和选择性。分级沸石有效地克服了这些局限性，提高了传质和传热性能，提高了其适用性和稳定性。分层沸石的制备有“自下而上”和“自上而下”两种典型的策略。然而，这些方法通常能耗高，制备过程长，并产生酸性和碱性废物。固体转化合成为制备分级沸石提供了一条高效、绿色的途径。与传统的微孔沸石相比，分级沸石可以提高催化（例如MTO和MTG反应）和吸附（例如VOCs，亚甲基蓝去除）的活性和/或选择性。综述了固体转化法合成分级沸石的研究进展、生产和应用情况。采用固体转化法合成的分级沸石在环境修复、催化生产、能源储存等领域显示出广阔的应用前景。因此，为实际应用铺平道路具有重要意义，它们的合成条件和结构变化值得进一步研究。

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引用次数: 0

Sulfolane reduction by arginine and ferrous iron ions 精氨酸和亚铁离子还原亚砜

Colloids and Surfaces C: Environmental Aspects

Pub Date : 2025-02-05 DOI: 10.1016/j.colsuc.2025.100061

Erica Pensini , Caitlyn Hsiung , Alejandro G. Marangoni , Joshua van der Zalm , Aicheng Chen , Nour Kashlan

Sulfolane is a water-miscible, bioavailable, worldwide pollutant. While its aerobic biodegradation by bacteria is well documented, its abiotic degradation by amino acids and metal ions has never been reported. Here we find that Fe^2 + and arginine (ARG) reduce sulfolane to sulfoxide at circum-neutral pH, as shown by attenuated total reflection-Fourier transform infrared spectroscopy. Sulfolane reduction occurs at the surface of iron-ARG solid flocs, onto which sulfoxide remains sorbed even after rinsing with water volumes up to 16-fold the floc volume. Sulfolane reduction by Fe²⁺ ions does not occur in the absence of ARG, which binds iron and affects its redox chemistry, as shown by cyclic voltammetry. Sulfolane reduction is also promoted by lysine, but not by histidine. Sulfolane is not reduced by Fe³⁺ and ARG, indicating that this reaction requires Fe²⁺ oxidation to Fe³⁺. The observed abiotic transformation of sulfolane may affect its fate in natural ecosystems.

磺胺砜是一种水溶性、生物可利用性、世界性的污染物。虽然细菌对其进行好氧生物降解已有文献记载，但氨基酸和金属离子对其进行非生物降解的报道从未见过。在这里，我们发现Fe2 +和精氨酸（ARG）在环中性pH下将亚砜还原为亚砜，如衰减全反射-傅里叶变换红外光谱所示。亚砜还原发生在铁- arg固体絮凝体表面，即使用高达絮凝体体积16倍的水量冲洗，亚砜仍被吸附在絮凝体表面。如循环伏安法所示，在没有ARG的情况下，Fe2+离子对硫代环的还原不会发生，ARG与铁结合并影响其氧化还原化学。赖氨酸也能促进硫代烷的还原，而组氨酸则不能。亚砜没有被Fe3+和ARG还原，说明该反应需要Fe2+氧化为Fe3+。观察到的环己烷的非生物转化可能影响其在自然生态系统中的命运。

引用次数: 0

Sunlight responsive photo-oxidation of methylene blue dye using MgO/MnO2 nanoparticles MgO/MnO2纳米颗粒光氧化亚甲基蓝染料的研究

Colloids and Surfaces C: Environmental Aspects

Pub Date : 2025-02-04 DOI: 10.1016/j.colsuc.2025.100062

Hamza Laksaci , Nassima Djihane Zemani , Omar Khelifi , Muhammad Saeed , Badreddine Belhamdi , Abdelaziz Arroussi , Mohamed Trari

Despite extensive research on metal oxide-based photocatalysts, challenges remain in optimizing their structural and defect properties to enhance photocatalytic efficiency for wastewater treatment, while maintaining stability and scalability. Herein, the application of MgO/MnO₂ for the photo-oxidation of methylene blue dye (MB), has been investigated under sunlight irradiations. The MgO/MnO₂ was prepared by co-precipitation in a one pot synthetic route. The resulted samples were characterized by FTIR, XRD, diffuse reflectance and electrical conductivity. The XRD showed that α-MnO₂ crystallizes in tetragonal symmetry with a medium broadening, characteristic of Nano-crystallites. A direct optical transition at 1.85 eV was determined from the diffuse reflectance. The capacitance-potential graph (C⁻² - E) exhibits a positive slope, characteristic of n-type behavior with a flat band potential of

- 0.027

V_SCE. Hence, the photoholes in the valence band (1.7 V_SCE) oxidize water into reactive radicals ^•OH, involved in the MB mineralization. The photocatalytic capability of Nano-materials was assessed through photodegradation of MB by solar light. Results showed that the MB elimination rate rises with increasing in catalyst load and the declines in the initial MB concentration. The catalytic behavior of MgO/MnO₂ synthesized by this method exhibits excellent efficiency, achieving 87 % degradation of MB under optimal conditions: 10 mg/L dye concentration and 75 mg/L catalyst dosage using the MgMn-2 catalyst. This research proposes a promising strategy to enhance the photocatalytic activity of MnO₂ by doping it with MgO, thereby improving its performance and contributing to a deeper understanding of the underlying photocatalytic mechanisms.

尽管对金属氧化物基光催化剂进行了广泛的研究，但在保持稳定性和可扩展性的同时，如何优化其结构和缺陷特性以提高废水处理的光催化效率仍然存在挑战。本文研究了MgO/MnO2在日光照射下光氧化亚甲基蓝染料（MB）的应用。采用一锅法共沉淀法制备了MgO/MnO2。采用红外光谱（FTIR）、x射线衍射（XRD）、漫反射和电导率等对样品进行了表征。XRD结果表明，α-MnO2呈四方对称结晶，介质展宽，具有纳米晶的特征。在1.85 eV处有直接光学跃迁。电容电位图（C−2 - E）呈正斜率，具有n型特征，平带电位为−0.027 VSCE。因此，价带（1.7 VSCE）上的光孔将水氧化成活性自由基•OH，参与了MB矿化。通过太阳能光降解MB，评价了纳米材料的光催化性能。结果表明，随着催化剂负荷的增加和初始甲基溴浓度的降低，甲基溴的去除率升高。该方法合成的MgO/MnO2催化剂在10 mg/L染料浓度和75 mg/L催化剂用量的最佳条件下，对MB的降解率达到87%。本研究提出了一种有前途的策略，通过掺杂MgO来增强MnO2的光催化活性，从而提高其性能，并有助于更深入地了解潜在的光催化机制。

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引用次数: 0

Navigating challenges in electroplating wastewater management: A study on pollutant removal characteristics and economic impacts by physicochemical treatment 电镀废水管理面临的挑战：理化处理的污染物去除特性和经济影响研究

Colloids and Surfaces C: Environmental Aspects

Pub Date : 2025-01-30 DOI: 10.1016/j.colsuc.2025.100060

Jingsi Gao , Hui-li Han , Jia Zhu , Jianfeng Zhou

The electroplating industry contributes significantly to environmental pollution, particularly through its discharge of complex wastewater containing heavy metals, organic pollutants, and refractory substances. To address the challenge of managing these pollutants, the treatment processes of a full-scale electroplating wastewater treatment plant in Shenzhen, China, were investigated in this study. The physicochemical treatment units were examined regarding the removal efficiency of target pollutants, sludge production, and cost implications. Substantial variability in treatment performance was observed due to fluctuations in wastewater quality and quantity. The chemical oxidation demand (COD) removal by the physicochemical treatment ranged from 24.26 % to 78.6 %, with effluent concentrations between 400–1000 mg/L, affected by refractory substances and improper dosing. Heavy metal removal was more effective at higher influent concentrations, with chromium achieving up to 99.83 % removal, while nickel and copper showed inconsistent performance due to complexed forms and dosing issues. Nitrogen removal reduced the total nitrogen concentration from 75.43–351.09 mg/L to ∼25–100 mg/L, relying on oxidation (NaClO) and sedimentation, but left residual nitrogen for biochemical treatment. Phosphorus removal, primarily through chemical precipitation, reduced total phosphorous to < 10 mg/L in optimal cases but fluctuated significantly due to poor pH control and competing reactions. Overall, while primary sedimentation and chemical processes contributed significantly, challenges such as process instability, refractory pollutants, and improper dosing impacted treatment consistency. These findings underscore the importance of optimizing treatment parameters and adopting innovative strategies to enhance process stability and cost-effectiveness. By advancing the understanding of electroplating wastewater treatment challenges, this study provides critical insights for improving industrial wastewater management and promoting sustainable environmental practices.

电镀工业对环境污染的贡献很大，特别是通过排放含有重金属、有机污染物和难降解物质的复杂废水。为了解决管理这些污染物的挑战，本研究对中国深圳一家全面电镀废水处理厂的处理过程进行了调查。物理化学处理单元对目标污染物的去除效率、污泥产量和成本影响进行了检查。由于废水质量和数量的波动，观察到处理性能存在很大差异。化学需氧量（COD）去除率在24.26% % ~ 78.6% %之间，出水浓度在400 ~ 1000 mg/L之间，受难处理物质和投加不当的影响。在较高的进水浓度下，重金属的去除效果更好，铬的去除率高达99.83 %，而镍和铜由于复杂的形态和剂量问题表现出不一致的性能。脱氮将总氮浓度从75.43 ~ 351.09 mg/L降低到~ 25 ~ 100 mg/L，依靠氧化（NaClO）和沉淀，但留下剩余的氮进行生化处理。除磷主要通过化学沉淀法，在最佳情况下将总磷降至<； 10 mg/L，但由于pH控制不佳和相互竞争的反应，波动很大。总的来说，虽然原始沉积和化学过程的影响很大，但过程不稳定、难降解污染物和不当剂量等挑战影响了处理的一致性。这些发现强调了优化处理参数和采用创新策略以提高工艺稳定性和成本效益的重要性。通过加深对电镀废水处理挑战的理解，本研究为改善工业废水管理和促进可持续环境实践提供了重要见解。

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引用次数: 0

Melamine-based hydrogen-bonded organic nanoframework for metal ion adsorption and antibacterial applications 基于三聚氰胺的氢键有机纳米框架在金属离子吸附和抗菌方面的应用

Colloids and Surfaces C: Environmental Aspects

Pub Date : 2025-01-27 DOI: 10.1016/j.colsuc.2025.100059

Anand Prakash , Anu Sharma , Anita Yadav , Rakesh Kumar Sharma

The present investigation reported the hydrothermal synthesis of melamine-based hydrogen organic nanoframework (M-HOFs) with promising toxic metal ions adsorption properties along with antibacterial activity. FTIR, XRD, FESEM, BET, and NTA analyses were utilized to perform the characterization of the synthesized M-HOF. The nanosized (83 nm), mesoporous nature, and high surface area (∼ 1199.93 m²/g) are responsible for adsorption and enhanced antibacterial activity. The adsorption studies showed that M-HOF is sensitive to Pb²⁺ ions in an aqueous medium. The Pb²⁺ ions quenched the emission of M-HOF to the largest extent with the K_SV value of 1.4099 × 10⁴ M⁻¹. The binding of Pb²⁺ ions leads to electronic changes in the structure of M-HOF. Additionally, M-HOF was investigated for its potential as an antibacterial agent based on its activity against Gram-positive and Gram-negative bacteria. The antibacterial efficiency of M-HOF against Pseudomonas aeruginosa (PA01) at 60 μg/mL was found to be 99 % after 10 h. M-HOF’s cytotoxicity was tested against HMEC-1 (Human microvascular endothelial cell line) at various concentrations, demonstrating good biocompatibility. This scalable and low-cost synthesis of M-HOF has great potential to reduce the environmental impact of waste, and disease transmission and can be utilized in dressings and food packaging areas.

本研究报道了水热合成三聚氰胺基氢有机纳米框架（M-HOFs），该框架具有吸附有毒金属离子和抗菌活性的良好性能。利用FTIR， XRD， FESEM， BET和NTA分析对合成的M-HOF进行表征。纳米尺寸（83 nm）、介孔性质和高表面积（~ 1199.93 m²/g）是吸附和增强抗菌活性的原因。吸附研究表明，M-HOF对水中Pb2+离子敏感。Pb2+离子对M- hof的猝灭作用最大，KSV值为1.4099 × 104 M−1。Pb2+离子的结合导致了M-HOF结构的电子变化。此外，基于其对革兰氏阳性和革兰氏阴性细菌的活性，研究了M-HOF作为一种抗菌剂的潜力。在60 μg/mL浓度下，M-HOF对铜绿假单胞菌（PA01）的抑菌效率在10 h后达到99 %。对不同浓度的人微血管内皮细胞系HMEC-1进行了细胞毒性实验，显示出良好的生物相容性。这种可扩展和低成本合成的高氟化氢具有巨大的潜力，可以减少废物对环境的影响和疾病传播，并可用于敷料和食品包装领域。

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引用次数: 0

Rapid and effective absorption of dye molecules from their low-concentrated water solutions by organically cross-linked polyacrylamide-hexagonal boron nitride nanocomposite and polyacrylamide hydrogels 有机交联聚丙烯酰胺-六方氮化硼纳米复合材料和聚丙烯酰胺水凝胶快速有效地从低浓度水溶液中吸收染料分子

Colloids and Surfaces C: Environmental Aspects

Pub Date : 2025-01-20 DOI: 10.1016/j.colsuc.2025.100055

Mohan Raj Krishnan, Edreese H Alsharaeh

Dye-laden wastewater from textile industries significantly impacts the environment and, eventually, human health. It is, therefore, necessary to treat wastewater effluent from textile industries before it is discharged into water sources. Herein, we report the potential of organically cross-linked polyacrylamide-based nanocomposite hydrogels to rapidly and effectively absorb different dye molecules (methylene blue (MB), phenol red (PR), and methyl orange (MO)) from their respective low-concentrated water solutions. The polyacrylamide-hexagonal boron nitride nanocomposite hydrogel (PAM/hBN) was prepared by reacting PAM molecules with organic cross-linkers such as N, N’ methylene bisacrylamide (MBS) in the presence of hBN at high temperatures (150 °C; 8 h.). The FT-IR results revealed the successful formation of the PAM/hBN nanocomposite hydrogels. The differential scanning calorimetric (DSC) results also complement the nanocomposite formation as the melting temperature of PAM/hBN nanocomposite is comparatively higher than that of the neat-PAM hydrogel. The SEM showed that the PAM/hBN nanocomposite has macroporous morphology (average pore size of 2 μm) while neat-PAM hydrogel exhibited dense structures. The equilibrium absorption of PAM/hBN nanocomposite hydrogels is as high as 13.5 mg/g, while the equilibrium is reached within 10 min. The porous morphology of the nanocomposite hydrogels promotes the mass transfer process and leads to the rapid absorption of dye molecules from low-concentrated water solutions.

纺织工业产生的含染料废水严重影响环境，并最终影响人类健康。因此，有必要在纺织工业的废水排入水源之前对其进行处理。在此，我们报告了有机交联聚丙烯酰胺基纳米复合水凝胶的潜力，以快速有效地吸收不同的染料分子（亚甲基蓝（MB），酚红（PR）和甲基橙（MO））从各自的低浓度水溶液中。在hBN存在下，PAM分子与N， N′亚甲基双丙烯酰胺（MBS）等有机交联剂在高温下(150 ℃； 8 h)。FT-IR结果显示PAM/hBN纳米复合水凝胶的成功形成。差示扫描量热（DSC）结果也补充了纳米复合材料的形成，因为PAM/hBN纳米复合材料的熔融温度相对高于净PAM水凝胶。SEM结果表明，PAM/hBN纳米复合材料具有大孔结构（平均孔径为2 μm），而净PAM水凝胶结构致密。PAM/hBN纳米复合水凝胶的平衡吸收率高达13.5 mg/g，在10 min内达到平衡。纳米复合水凝胶的多孔形态促进了传质过程，并导致染料分子从低浓度水溶液中快速吸收。

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引用次数: 0

Discovery of the role of MoS2 in the promotion of peroxymonosulfate activation for the degradation of sulfamethoxazole in Fe/CN 发现二硫化钼促进过氧单硫酸盐活化降解铁/CN中磺胺甲恶唑的作用

Colloids and Surfaces C: Environmental Aspects

Pub Date : 2025-01-14 DOI: 10.1016/j.colsuc.2025.100054

Zuowei Xie , Shuangli Li , Chao Wang, Sen Qiao

The widespread application of antibiotics can lead to the growth of numerous antibiotic-resistant bacteria in the ecosystem. Electron-rich iron sites in iron-based catalysts are considered to be the main sites for activation of peroxymonosulfate (PMS), but the restricted Fe^2 +/Fe³⁺ cycling inhibits the catalytic performance of iron-based catalysts. To address the above challenges, we prepared Fe/CN@MoS₂-X (X represents the Fe/Mo mass ratio) samples with dual active sites by anchoring MoS₂ nanosheets on Fe/CN nanocomposite catalysts. The inclusion of MoS₂ not only promotes Fe²⁺/Fe³⁺ cycling and accelerates electron transfer, thus improving the catalytic performance, but enhances environmental tolerance (wide pH application range 3–9 and resistance to ionic interference). The degradation rate of sulfamethoxazole (SMX) by the Fe/CN@MoS₂-1/PMS system (0.15 min⁻¹) was 3.76 times higher than that of the Fe/CN/PMS system (0.04 min⁻¹). Moreover, the Fe/CN@MoS₂-1/PMS system exhibited excellent stability and regeneration ability, with the removal rate remaining stable at 92 % after 5 cycles. Quenching experiments and EPR tests demonstrated that •OH, SO₄^-•, O₂^-• and ¹O₂ in the Fe/CN@MoS₂-1/PMS system were all involved in the SMX degradation. Finally, the C-N, N-O, S-N, C-O and C-S bonds of SMX are readily attacked by reactive actives, resulting in the generation of non-toxic intermediates in the system. This work shows that Fe/CN@MoS₂ presents satisfactory versatility, recyclability and stability, as well as providing new perspectives to address Fe²⁺/Fe³⁺ cycling in iron-based catalysts.

抗生素的广泛应用会导致生态系统中大量耐药细菌的生长。铁基催化剂中的富电子铁位点被认为是激活过氧单硫酸盐（PMS）的主要位点，但受限的Fe2 +/Fe3+循环抑制了铁基催化剂的催化性能。为了解决上述问题，我们将MoS2纳米片锚定在Fe/CN纳米复合催化剂上，制备了具有双活性位点的Fe/CN@MoS2-X （X代表Fe/Mo质量比）样品。MoS2的加入不仅促进了Fe2+/Fe3+循环，加速了电子转移，从而提高了催化性能，而且增强了环境耐受性（pH范围宽3-9，耐离子干扰）。Fe/CN@MoS2-1/PMS体系对磺胺甲恶唑（SMX）的降解率（0.15 min−1）是Fe/CN/PMS体系（0.04 min−1）的3.76倍。此外，Fe/CN@MoS2-1/PMS体系表现出良好的稳定性和再生能力，经过5次循环后，去除率稳定在92 %。淬火实验和EPR测试表明，Fe/CN@MoS2-1/PMS体系中的•OH、SO4-•、O2-•和1O2都参与了SMX的降解。最后，SMX的C-N、N-O、S-N、C-O和C-S键容易被活性物质攻击，从而在体系中生成无毒中间体。这项工作表明，Fe/CN@MoS2具有令人满意的多功能性、可回收性和稳定性，并为解决铁基催化剂中Fe2+/Fe3+的循环问题提供了新的视角。

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引用次数: 0

High-efficient tetracycline removal triggered by Fe-based metal organic framework and sequential reutilization of spent adsorbent 铁基金属有机骨架对四环素的高效去除及废吸附剂的顺序再利用

Colloids and Surfaces C: Environmental Aspects

Pub Date : 2024-12-15 DOI: 10.1016/j.colsuc.2024.100053

Ting Chang , Yuchen Shang , Shiwen Li , Min Zeng , Jue Liu

Adsorption, as an economical and effective strategy, has been widely used for treating antibiotics pollution. However, the rational disposal and limited reutilization of spent adsorbents restricts the practical application. Herein, metal organic framework (MIL-101(Fe)) was fabricated and used to remove antibiotics from aqueous environment. Specifically, the removal rate and adsorption capacity towards TC, a model pollutant, reached 95.54 % ± 1.4 % and 231.04 ± 3.29 mg/g for M-105, respectively. The adsorption mechanism could be ascribed to electrostatic attraction, π-π interaction and hydrogen bonding, pore filling and complexation identified with experimental results and spectroscopic analysis. The spent adsorbent was further annealed to Fe/Fe₃C/carbon composite, which possessed high-efficient microwave absorption performance due to good dielectric property. This work identifies MIL-101(Fe), obtained with a simple fabrication method, could be employed as a high-efficient adsorbent in TC removal and offers a novel strategy for reusing spent adsorbent in microwave absorption field.

吸附作为一种经济有效的处理抗生素污染的方法已得到广泛应用。然而，废吸附剂的合理处理和有限的再利用限制了其实际应用。本文制备了金属有机骨架（MIL-101(Fe)），并将其用于去除水中环境中的抗生素。其中，M-105对模型污染物TC的去除率和吸附量分别达到95.54 % ± 1.4 %和231.04 ± 3.29 mg/g。吸附机理可归结为静电吸引、π-π相互作用和氢键作用、孔隙填充和络合作用。将废吸附剂进一步退火成Fe/Fe3C/碳复合材料，该材料具有良好的介电性能，具有高效的微波吸收性能。通过简单的制备方法得到的MIL-101（Fe）可作为一种高效的吸附剂用于去除TC，并为废吸附剂在微波吸收领域的重复利用提供了一种新的策略。

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引用次数: 0

Estimation of laser spot size in Raman micro-imaging and improved particle size estimation of small microplastics 拉曼微成像中激光光斑尺寸的估计及改进的微塑料颗粒尺寸估计

Colloids and Surfaces C: Environmental Aspects

Pub Date : 2024-12-10 DOI: 10.1016/j.colsuc.2024.100052

Zijiang Yang, Hisayuki Arakawa

In this study, we developed a method to estimate laser spot size during Raman micro-imaging by integrating experimental data from standard microplastic samples with a simulation model that characterizes interactions between the laser spot and microplastic particles. The experimental data were also used to examine the relationships among correlation coefficient between sample spectra and standard spectrum (CFF), standard deviation of spectral noise (σ_ns), signal-to-noise ratio (SNR), and their spatial properties. Analysis of the micro-imaging data shows that CFF, σ_ns, and SNR are related to the presence of microplastic particles. Specifically, when a measurement point detects a particle, the values of CFF, σ_ns, and SNR are higher than those in the background filter. Further analysis of CFF reveals that its values are spatially dependent, showing a notable pattern within the effective range that is similar to, or slightly exceeds, the particle size. Additionally, CFF values decrease with increasing distance from the particle center, a trend that can be described by a logistic function. By applying this dataset, we determined the laser spot size in our setup to be 65 μm, allowing for a 24 % - 74 % improvement in particle size estimation accuracy, as measured by the root-mean-square-error. This study highlights the important role of laser spot size in Raman micro-imaging analysis and provides a robust methodology that can be adapted to other instruments and micro-imaging techniques.

在这项研究中，我们开发了一种在拉曼微成像过程中估计激光光斑大小的方法，该方法通过将来自标准微塑料样品的实验数据与表征激光光斑与微塑料颗粒之间相互作用的模拟模型相结合。利用实验数据考察了样品光谱与标准光谱的相关系数（CFF）、光谱噪声的标准差（σns）、信噪比（SNR）及其空间特性之间的关系。显微成像数据分析表明，CFF、σns和信噪比与微塑性颗粒的存在有关。具体来说，当测点检测到一个粒子时，CFF、σns和信噪比都要高于背景滤波器。进一步分析表明，CFF值具有空间依赖性，在与粒径相近或略大于粒径的有效范围内呈现出明显的规律。此外，CFF值随着离粒子中心距离的增加而减小，这一趋势可以用逻辑函数来描述。通过应用该数据集，我们确定了我们设置中的激光光斑尺寸为65 μm，允许通过均方根误差测量的粒度估计精度提高24 % - 74 %。本研究强调了激光光斑尺寸在拉曼微成像分析中的重要作用，并提供了一种可适用于其他仪器和微成像技术的强大方法。

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引用次数: 0

A zwitterionic surfactant concentrates sulfolane in floating foams, to purify water 一种齐聚物表面活性剂可将磺烷浓缩在浮泡中，用于净化水

Colloids and Surfaces C: Environmental Aspects

Pub Date : 2024-11-22 DOI: 10.1016/j.colsuc.2024.100051

Erica Pensini , Caitlyn Hsiung , Saeed Mirzaee Ghazani , Alejandro Marangoni

Sulfolane is a worldwide groundwater miscible pollutant, used for carbon capture and sour gas treatment. It is heavier than water and can sink when spilled in low salinity aquifers, posing remedial challenges. There are no strategies to prevent sulfolane plunging, other than pumping large groundwater volumes. We show that the zwitterionic surfactant cocamidopropyl betaine (CAPB) interacts with sulfolane, producing a stable floating foam, in which sulfolane is concentrated by >140 %. The foam forms by bubbling air or mild mixing. CAPB is surface active in either water or in aqueous sulfolane mixtures, and its films stabilize the air-water interface even upon significant deformation. CAPB-sulfolane interactions disrupt the water network, thereby decreasing the heat and onset of water evaporation from the foam. While CAPB successfully concentrated sulfolane, Tween 20 did not. Cationic cetyltrimethylammonium bromide binds sulfolane, but extraction of sulfolane was not possible due to foam instability.

磺丙烷是一种世界性的地下水混溶污染物，用于碳捕获和酸性气体处理。它比水重，在低盐度含水层中泄漏时会下沉，给补救工作带来挑战。除了抽取大量地下水之外，目前还没有其他策略可以防止磺烷下沉。我们的研究表明，齐聚物表面活性剂椰油酰胺丙基甜菜碱（CAPB）可与磺丙烷相互作用，产生稳定的浮动泡沫，其中磺丙烷的浓度为 140%。通过鼓泡空气或轻度搅拌即可形成泡沫。CAPB 在水或水性磺丙烷混合物中都具有表面活性，其薄膜即使在发生重大变形时也能稳定空气-水界面。CAPB 与砜烷的相互作用会破坏水网络，从而降低泡沫的热量和水蒸发的开始时间。CAPB 成功地浓缩了砜烷，而吐温 20 却没有。阳离子十六烷基三甲基溴化铵可与砜烷结合，但由于泡沫不稳定，无法萃取砜烷。

引用次数: 0