Separation and Purification Technology最新文献_第5页

The performance of a graphene oxide thin film composite membrane for sweet whey ultrafiltration 用于甜乳清超滤的氧化石墨烯薄膜复合膜的性能

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2024-09-24 DOI: 10.1016/j.seppur.2024.129868

Membranes manufactured from graphene oxide (GO) have received significant attention for desalination and nanofiltration applications due to their exceptional mechanical strength, chemical stability and high selectivity. However, the performance of GO membranes in food processing applications is less well understood. In this work, the performance of a GO membrane, advertised as being of 1 kDa molecular weight cutoff, is compared to that of two commercial polymeric membranes of different molecular weight cut-off (advertised as 10 kDa and 1 kDa) for the ultrafiltration of sweet whey from the dairy industry. At bench scale, the GO membrane had comparable rejection for both total solids and protein to the 10 kDa polymeric membrane, but with more than double the flux, provided by a much lower intrinsic membrane resistance. Analysis of the membrane fouling process suggested that the GO membrane fouled more slowly than the 1 kDa polymeric membrane, but the fouling process was not significantly different to that reported in the literature for polymeric membranes in this application. Pilot scale trials conducted using a commercial spiral wound module of 1.2 m² area of the GO membrane confirmed that the membrane retained a higher flux. This flux was, however, reduced from the bench scale value.

由氧化石墨烯（GO）制造的膜因其卓越的机械强度、化学稳定性和高选择性，在海水淡化和纳滤应用中受到了极大关注。然而，人们对 GO 膜在食品加工应用中的性能了解较少。在这项工作中，我们比较了截留分子量为 1 kDa 的 GO 膜与两种截留分子量不同（截留分子量分别为 10 kDa 和 1 kDa）的商用聚合物膜在乳制品行业甜乳清超滤中的性能。在工作台规模上，GO 膜对总固体和蛋白质的截留量与 10 kDa 聚合物膜相当，但由于膜的内在阻力低得多，其通量是后者的两倍多。对膜堵塞过程的分析表明，GO 膜的堵塞速度比 1 kDa 聚合物膜慢，但堵塞过程与文献中报道的聚合物膜在此应用中的堵塞过程没有明显不同。使用面积为 1.2 平方米的商用螺旋缠绕式 GO 膜组件进行的中试试验证实，该膜能保持较高的通量。不过，这一通量与台架规模的数值相比有所降低。

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引用次数: 0

A novel mixed depressant for the flotation separation of scheelite and cassiterite: Adsorption mechanism and performance 用于浮选分离白钨矿和锡石的新型混合抑制剂：吸附机理和性能

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2024-09-24 DOI: 10.1016/j.seppur.2024.129823

Citric acid (CA) exhibits weak inhibitory on some oxidized gangue minerals owing to its relatively few hydrophilic polar groups (OH and COOH). This study investigate the synergistic mechanism of ferrous ions (Fe²⁺) to enhance both the selective adsorption capacity and stability of CA. The separation of scheelite and cassiterite through a flotation process was successfully achieved using a Fe²⁺/CA mixed depressant. Micro-flotation test results revealed that with the addition of Fe²⁺/CA, 84.60 % of scheelite and 23.64 % of cassiterite were recovered in the foam concentrate, with grades of 66.26 % and 17.73 %, respectively. Fe²⁺/CA had a strong depressing effect on cassiterite, resulting in a 69.30 % decrease in its recovery and a 20.33 % decrease in its grade. This indicates the effective separation of scheelite from cassiterite. Fe²⁺/CA exhibited a high adsorption affinity for the cassiterite surface, which mainly comprised L^3–, Fe²⁺, and FeOH⁺ components. Additionally, the FeOH⁺ complex, formed from the pre-reaction between Fe²⁺ and CA, exhibited significant chemical adsorption at the Sn active sites, thereby depressing cassiterite. The high-intensity adsorption peaks at cracks and the significant increase in the normalized intensity of FeOH⁺ on the cassiterite surface indicated that the FeOH⁺ complex had stronger adsorption on cassiterite and selectively depressed cassiterite. This enhanced both the selective adsorption capacity and stability of CA on the cassiterite surface. The Fe²⁺/CA mixed depressant achieved efficient flotation separation of scheelite and cassiterite.

柠檬酸（CA）由于亲水性极性基团（OH 和 COOH）相对较少，对一些氧化煤矸石矿物具有较弱的抑制作用。本研究探讨了亚铁离子（Fe2+）增强 CA 选择性吸附能力和稳定性的协同机制。使用 Fe2+/CA 混合抑制剂，通过浮选工艺成功实现了白钨矿和锡石的分离。微浮选试验结果表明，加入 Fe2+/CA 后，泡沫精矿中回收了 84.60 % 的白钨矿和 23.64 % 的锡石，品位分别为 66.26 % 和 17.73 %。Fe2+/CA 对锡石有强烈的抑制作用，导致其回收率下降 69.30%，品位下降 20.33%。这表明白钨矿能从锡石中有效分离出来。Fe2+/CA 对锡石表面具有很高的吸附亲和力，主要由 L3-、Fe2+ 和 FeOH+ 组成。此外，Fe2+ 和 CA 预反应形成的 FeOH+ 复合物在锡活性位点上有明显的化学吸附作用，从而抑制锡石。裂缝处的高强度吸附峰和锡石表面上 FeOH+ 的归一化强度的显著增加表明，FeOH+ 复合物对锡石有更强的吸附力，并能选择性地抑制锡石。这增强了 CA 在锡石表面的选择性吸附能力和稳定性。Fe2+/CA混合抑制剂实现了白钨矿和锡石的高效浮选分离。

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引用次数: 0

Coupling defect-inherent built-in electric fields to promote directional charge migration for rapid photocatalytic degradation of levofloxacin 耦合缺陷固有内置电场，促进电荷定向迁移，实现左氧氟沙星的快速光催化降解

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2024-09-24 DOI: 10.1016/j.seppur.2024.129856

By enhancing the intrinsic built-in electric field (IEF) of the catalyst through defect engineering, and coupling the IEF of the catalyst via an S-type heterojunction structure, a 3-in-1 IEF is formed, which drives the directional migration of electrons and holes, and can effectively improve photocatalytic performance. In this paper, an oxygen vacancy-type Bi₂WO₆ (Ov-BWO) composite with twin-type Zn_0.5Cd_0.5S (ZCS) was synthesized to construct an S-scheme heterojunction. The twin structure results in an IEF in ZCS that points from the twin plane Zn to the twin boundary S. The oxygen vacancies, on the other hand, create an internal electric field from Bi and W to O by altering the local charge density. By coupling the IEF of the catalyst through the S-type heterojunction, an enhanced IEF is formed, pointing from the twin plane Zn to the O in Ov-BWO, enabling rapid directional migration of photogenerated charge carriers. Furthermore, potential Levofloxacin (LVFX) intermediates and degradation pathways were found by combining Liquid chromatography-mass spectrometry (LC-MS) data with Density Functional Theory (DFT) simulations. This study systematically elucidates the photocatalytic degradation system, from catalyst design to the degradation process of pollutants, through the analysis of theoretical calculations and experimental results.

通过缺陷工程增强催化剂的本征内置电场（IEF），并通过S型异质结结构耦合催化剂的IEF，形成三合一IEF，驱动电子和空穴定向迁移，可有效提高光催化性能。本文合成了氧空位型Bi2WO6（Ov-BWO）与孪生型Zn0.5Cd0.5S（ZCS）的复合材料，构建了S型异质结。另一方面，氧空位通过改变局部电荷密度产生了从 Bi 和 W 到 O 的内部电场。通过 S 型异质结耦合催化剂的内电场，形成了增强的内电场，从孪生面 Zn 指向 Ov-BWO 中的 O，从而使光生电荷载流子快速定向迁移。此外，通过将液相色谱-质谱（LC-MS）数据与密度泛函理论（DFT）模拟相结合，还发现了潜在的左氧氟沙星（LVFX）中间体和降解途径。本研究通过对理论计算和实验结果的分析，系统地阐明了从催化剂设计到污染物降解过程的光催化降解系统。

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引用次数: 0

Interfacial properties of CO2 and liquid sulfur in high-sulfur gas fields: Molecular simulations on carbonate mineral surfaces 高硫气田中二氧化碳与液态硫的界面特性：碳酸盐矿物表面的分子模拟

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2024-09-24 DOI: 10.1016/j.seppur.2024.129835

As the global energy landscape transforms, the development of high-sulfur natural gas has become increasingly critical. However, sulfur deposition during these gas field developments significantly affects operational efficiency. This study employed molecular dynamics simulation to explore the effectiveness of CO₂ in alleviating sulfur deposition on carbonate rock reservoirs. Specifically, it examined the interfacial tension between liquid sulfur and CO₂, the wettability of sulfur on carbonate rock mineral surfaces, and the kinetics of CO₂ displacing liquid sulfur. Results show that as CO₂ pressure increases from 10 MPa to 60 MPa, the interfacial tension between liquid sulfur and CO₂ decreases by 84 %, from 35.54 mN/m to 5.53 mN/m. The contact angles of sulfur droplets on calcite and dolomite surfaces stabilize at 41.82° ± 2.10° and 44.33° ± 3.27°, respectively, indicating greater sulfur spread on calcite surfaces. With higher CO₂ pressures, sulfur deposition on mineral surfaces and interfacial tension both decrease significantly, while the wetting angle of liquid sulfur increases, particularly on dolomite. At 60 MPa CO₂ pressure, the adsorption energy of dolomite for liquid sulfur drops from 364.56 kcal/mol to 25.46 kcal/mol, a 93 % reduction, suggesting CO₂′s dual role in displacing sulfur and promoting its desorption from mineral surfaces. Furthermore, the efficiency of sulfur deposition alleviation in carbonate rock slit structures improves and stabilizes at around 40 MPa CO₂ pressure. This study presents a potential environmentally friendly approach for efficiently developing high-sulfur gas fields, and its findings provide practical insights for optimizing CO₂ injection strategies to mitigate sulfur deposition.

随着全球能源格局的转变，高硫天然气的开发变得越来越重要。然而，这些气田开发过程中的硫沉积严重影响了运营效率。本研究采用分子动力学模拟来探讨二氧化碳在减轻碳酸盐岩储层硫沉积方面的效果。具体而言，它考察了液态硫和二氧化碳之间的界面张力、硫在碳酸盐岩矿物表面的润湿性以及二氧化碳置换液态硫的动力学。结果表明，当二氧化碳压力从 10 兆帕增加到 60 兆帕时，液态硫和二氧化碳之间的界面张力降低了 84%，从 35.54 mN/m 降至 5.53 mN/m。硫滴在方解石和白云石表面的接触角分别稳定在 41.82° ± 2.10° 和 44.33° ± 3.27°，表明硫在方解石表面的扩散更大。随着 CO2 压力的升高，硫在矿物表面的沉积和界面张力都会显著降低，而液态硫的润湿角则会增大，尤其是在白云石上。在 60 兆帕二氧化碳压力下，白云石对液态硫的吸附能从 364.56 kcal/mol 降至 25.46 kcal/mol，降幅达 93%，这表明二氧化碳具有置换硫和促进硫从矿物表面解吸的双重作用。此外，碳酸盐岩缝隙结构中的硫沉积缓解效率也有所提高，并在二氧化碳压力为 40 兆帕左右时趋于稳定。这项研究为高效开发高含硫气田提供了一种潜在的环境友好型方法，其研究结果为优化二氧化碳注入策略以减轻硫沉积提供了实用见解。

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引用次数: 0

Numerical study of cleaning performance and flow field characteristics of chuck type filter cartridges 卡盘式滤芯的清洁性能和流场特性数值研究

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2024-09-24 DOI: 10.1016/j.seppur.2024.129858

Filter cartridges have a high collection efficiency for fine particles and are used to reduce and control pollution. A chuck structure is installed on the top of the cartridge to allow for quick installation and removal of the cartridge. However, the inner diameter of chucks used in industry is usually smaller than the outer diameter of the cartridge, resulting in the actual outlet area of the cartridge being only about 70% of the theoretical outlet area. To better design and optimize the filter cartridge dust collector, analyzing the flow characteristics inside the cartridge with the chuck installed was necessary. In this work, Peak static pressure and comprehensive pressure (P_C) are used as indexes to study the influence of different types of chuck over the performance of cleaning from cartridges, as well as to analyze the flow characteristics within the cartridge under different conditions. It was shown that chucks improve the cartridge cleaning performance by increasing the peak static pressure in the upper part, resulting in a maximum of 167.4% compared to no chuck. Enhancement of cleaning performance at the top of chucked cartridges is caused by airflow buildup, while enhancement of air permeability at the top cuts down on the cleaning intensity, so the improvement of cartridges by breathable chucks is always lower than that of common chucks. In addition, based on the trend of the overall cleaning strength of the cartridge, we obtained the jet diffusion angle and the formula for the optimal chuck inner diameter, which helps to choose the parameters of the chuck more conveniently in practical applications.

滤芯对细微颗粒的收集效率很高，用于减少和控制污染。滤筒顶部安装有卡盘结构，以便快速安装和拆卸滤筒。然而，工业中使用的卡盘内径通常小于滤芯外径，导致滤芯的实际出口面积仅为理论出口面积的 70% 左右。为了更好地设计和优化滤筒除尘器，有必要分析安装卡盘后滤筒内部的流动特性。这项工作以峰值静压和综合压力（PC）为指标，研究不同类型的卡盘对滤筒清灰性能的影响，并分析不同条件下滤筒内的流动特性。结果表明，卡盘通过增加上部的峰值静压提高了滤筒的清洁性能，与无卡盘相比，最大提高了 167.4%。夹头式滤筒顶部清洁性能的提高是由气流积聚引起的，而顶部透气性的提高会降低清洁强度，因此透气夹头对滤筒的改善总是低于普通夹头。此外，根据滤芯整体清洁强度的变化趋势，我们得到了喷射扩散角和最佳卡盘内径的计算公式，这有助于在实际应用中更方便地选择卡盘参数。

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引用次数: 0

Defective MOF incorporating CF3 functionality via fragmented linker co-assembly for high C2H6/C2H4 selectivity and C2H6 uptake 通过片段连接体共组装实现 CF3 功能的缺陷 MOF，具有较高的 C2H6/C2H4 选择性和 C2H6 吸收能力

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2024-09-24 DOI: 10.1016/j.seppur.2024.129821

The production of high-purity ethylene requires an adsorbent with high C₂H₆/C₂H₄ selectivity, outstanding C₂H₆ adsorption, and facile C₂H₆ regeneration. Towards this goal, a series of novel defective CF₃-functionalized metal–organic framework (MOF) materials (UiO-66-nCF₃, n = 25, 50, 60, and 75) were synthesized by co-assembling the framework with terephthalic acid as the linker and various percentages (n) of CF₃-functionalized ligands. The C₂H₆ adsorption strength increased as the density of CF₃ groups increased. In particular, UiO-66-50CF₃ exhibited high C₂H₆/C₂H₄ selectivity (2.04), excellent C₂H₆ adsorption (2.5 mmol/g), and modest C₂H₆ isosteric heat of adsorption (Q_st) (∼28.9 kJ/mol). Additionally, the material exhibited high C₂H₆/C₂H₄ breakthrough selectivity (1.64) and large high-purity (>99.9 %) C₂H₄ productivity (7.32 L_STP kg⁻¹) under dynamic flow conditions (C₂H₆/C₂H₄ = 1:15 (v/v)). UiO-66-50CF₃ could readily be regenerated at room temperature, and demonstrated good hydrothermal stability in boiling water for 1 h and high thermal stability up to 500 °C. The incorporation of a high density of CF₃ groups within a MOF via fragmented linker co-assembly is a promising strategy for developing adsorbents for C₂H₆/C₂H₄ separation.

高纯度乙烯的生产需要一种具有高 C2H6/C2H4 选择性、出色的 C2H6 吸附性和方便 C2H6 再生的吸附剂。为了实现这一目标，我们以对苯二甲酸为连接剂，通过与不同比例（n）的 CF3 功能化配体共组装，合成了一系列新型有缺陷的 CF3 功能化金属有机框架（MOF）材料（UiO-66-nCF3，n = 25、50、60 和 75）。随着 CF3 基团密度的增加，C2H6 的吸附强度也随之增加。其中，UiO-66-50CF3 表现出较高的 C2H6/C2H4 选择性（2.04）、出色的 C2H6 吸附性（2.5 mmol/g）和适度的 C2H6 等效吸附热（Qst）（28.9 kJ/mol）。此外，在动态流动条件下（C2H6/C2H4 = 1:15 (v/v)），该材料表现出较高的 C2H6/C2H4 突破选择性（1.64）和较高的高纯度（99.9%）C2H4 生产率（7.32 LSTP kg-1）。UiO-66-50CF3 易于在室温下再生，并在沸水中 1 小时内表现出良好的水热稳定性和高达 500 °C 的高热稳定性。通过片段连接体共组装在 MOF 中加入高密度的 CF3 基团是开发用于 C2H6/C2H4 分离的吸附剂的一种很有前景的策略。

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引用次数: 0

Recycle of Fe/Ca-rich fly ash in preparation of modified porous ceramsite for selective and efficient phosphate recovery 回收富含铁/钙的粉煤灰，制备用于选择性高效磷酸盐回收的改性多孔陶瓷石

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2024-09-24 DOI: 10.1016/j.seppur.2024.129860

Although wastewater management has systematically developed globally, the removal efficiency of phosphates still posed a serious challenge and attracted worldwide concerns. On the other side, the discharge of fly ash (FA) from sludge incineration also caused serious environmental problems. In this study, Fe/Ca-rich FA was recycled to synthesize a porous ceramsite (modified CFA) through a non-sintered method. It could be an efficient adsorbent for phosphate recovery in virtue of abundant adsorption sites, accompanied by its low-cost and environmental friendliness. The phosphate adsorption capacity was 26.31 mg-P·g^-1 for modified CFA, and its average adsorption rate could reach 1.344 mg-P·(g·day)^-1 in the first 2 days. While it could also efficiently immobilize phosphate for a quite long period in the dynamic system effluent. According to electron microscopic and spectroscopic characterizations, modified CFA was indicated to chemisorb and immobilize phosphates via multiple interface interactions. Phosphates were firstly H-bonded with the surface Fe/Ca-OH of modified CFA and then rapidly coordinate with active Fe sites through a ligand exchange mechanism. When the exposed Fe sites had been saturated-adsorbed, inner-sphere Ca-O-P coordination would be further formed. In summary, this study provides a promising FA-derived adsorbent and realizes the efficient P pollution management with low cost and minimal environmental risks, which would be a potential waste-to-wealth strategy for further applications.

尽管废水管理在全球范围内得到了系统性的发展，但磷酸盐的去除效率仍然是一个严峻的挑战，引起了全世界的关注。另一方面，污泥焚烧产生的飞灰（FA）排放也造成了严重的环境问题。本研究采用非烧结法回收富含铁/钙的粉煤灰，合成多孔陶瓷石（改性粉煤灰）。它具有丰富的吸附位点，同时成本低廉、环境友好，是一种高效的磷酸盐回收吸附剂。改性 CFA 的磷酸盐吸附容量为 26.31 mg-P-g-1，其平均吸附率在前 2 天可达到 1.344 mg-P-(g-day)-1。同时，它还能在动态系统出水中长期有效地固定磷酸盐。根据电子显微镜和光谱表征，改性 CFA 可通过多种界面相互作用对磷酸盐进行化学吸附和固定。磷酸盐首先与改性 CFA 表面的 Fe/Ca-OH 发生 H 键作用，然后通过配体交换机制迅速与活性铁位点配位。当暴露的铁位点吸附饱和后，进一步形成内球 Ca-O-P 配位。总之，本研究提供了一种前景广阔的 FA 衍生吸附剂，并以低成本和最小的环境风险实现了高效的 P 污染治理，这将是一种潜在的变废为宝策略，可进一步推广应用。

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引用次数: 0

Ag@CuS/CC electrode promoting antibiotics removal in DBD system: Mechanism analysis and practical application Ag@CuS/CC电极促进DBD系统中抗生素的去除：机理分析与实际应用

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2024-09-24 DOI: 10.1016/j.seppur.2024.129786

In this study, rice-granular CuS nanoparticles are grown in situ on carbon cloth (CC) using a hydrothermal method and Ag is then loaded on the CuS/CC via ultrasonic-assisted reduction. The electrodes combined with a dielectric barrier discharge (DBD) system can improve the plasma discharge efficiency and have good oxidation properties for tetracycline, amoxicillin and sulfamethoxazole. The removal rate is further improved after adding Cr(VI). The active substances, H₂O₂ and O₃, are consumed during the process of antibiotic degradation. Trapping agent experiments indicate that h⁺, ∙OH and O₂∙⁻ play a crucial oxidation role in the reaction, with O₂∙⁻ being identified as the primary active substance. The pollutant degradation can be further accelerated by capturing e⁻ and ·H for the reduction of Cr(VI). By calculating the adsorption energies of H₂O and O₂ on the surface of Ag@CuS, it is also concluded that O₂ is easily adsorbed and preferentially generates O₂∙⁻. The residual intermediates in the samples after the degradation of tetracycline, amoxicillin and sulfamethoxazole are determined and their degradation pathways also explored. The Ag@CuS/CC-DBD system has application potential in actual wastewater treatment as it can not only reduce the chemical oxygen demand but also improve the biodegradability of wastewater.

在这项研究中，采用水热法在碳布（CC）上原位生长出米粒状的 CuS 纳米颗粒，然后通过超声波辅助还原法在 CuS/CC 上负载 Ag。该电极与介质阻挡放电（DBD）系统相结合，可提高等离子体放电效率，并对四环素、阿莫西林和磺胺甲噁唑具有良好的氧化性能。加入六价铬后，去除率进一步提高。在抗生素降解过程中，活性物质 H2O2 和 O3 会被消耗掉。诱捕剂实验表明，h+、∙OH 和 O2∙- 在反应中起着关键的氧化作用，其中 O2∙- 被确定为主要活性物质。通过捕获 e- 和 -H 来还原 Cr(VI)，可以进一步加速污染物的降解。通过计算 H2O 和 O2 在 Ag@CuS 表面的吸附能，还得出结论：O2 很容易被吸附并优先生成 O2∙-。测定了四环素、阿莫西林和磺胺甲噁唑降解后样品中的残留中间产物，并探索了它们的降解途径。Ag@CuS/CC-DBD 系统不仅能降低化学需氧量，还能提高废水的生物降解性，因此在实际废水处理中具有应用潜力。

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引用次数: 0

Polypropylene membrane with gradient-distributed covalent organic framework for highly efficient blood oxygenation 具有梯度分布共价有机框架的聚丙烯膜，可实现高效血液氧合

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2024-09-24 DOI: 10.1016/j.seppur.2024.129857

Hollow fiber membrane (HFM) is widely used for extracorporeal membrane oxygenator (ECMO) because of large membrane area, high packing density, self-supporting structure and good flexibility. However, polymeric HFMs often suffer from a trade-off between gas permeability and anti-plasma leakage performance. In this study, HFMs with gradient structure were prepared by introducing COF-42 as fillers into the polypropylene (PP) matrix through surface segregation. The enriched COF-42 near the upper surface endowed the membrane a gradient structure to reduce the plasma leakage and improve gas permeability. Compared with PP membranes, PP/COF-42 oxygenation membranes retained good blood compatibility and higher mechanical properties. The PP/COF-42–0.5 HFMs exhibited O₂ exchange rate of ∼ 342.6 ml min⁻¹ m⁻² and CO₂ exchange rate of ∼ 989.6 ml min⁻¹ m⁻², which was about 218.7 % and 15.4 % larger than that of the PP HFMs, respectively. Moreover, the simulated plasma leakage time could reach 124 h, which was about 21 times longer than that of PP HFMs. The membranes exhibited excellent blood oxygenation performance and anti-plasma leakage performance, which had great potential in ECMO.

中空纤维膜（HFM）具有膜面积大、堆积密度高、自支撑结构和柔韧性好等特点，因此被广泛应用于体外膜氧合器（ECMO）。然而，聚合物 HFM 通常会在气体渗透性和抗等离子体泄漏性能之间进行权衡。本研究将 COF-42 作为填料通过表面偏析引入聚丙烯（PP）基体中，制备了具有梯度结构的高频膜。靠近上表面的富集 COF-42 使膜具有梯度结构，从而减少了等离子体泄漏并提高了气体渗透性。与 PP 膜相比，PP/COF-42 氧合膜保持了良好的血液相容性和更高的机械性能。PP/COF-42-0.5 高频膜的氧气交换率为 ∼ 342.6 ml min-1 m-2 ，二氧化碳交换率为 ∼ 989.6 ml min-1 m-2 ，分别比 PP 高频膜高出约 218.7% 和 15.4%。此外，模拟血浆泄漏时间可达 124 小时，是 PP 高频膜的 21 倍。该膜具有优异的血液氧合性能和抗血浆渗漏性能，在 ECMO 中具有很大的应用潜力。

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引用次数: 0

Efficient separation and extraction of guaiacol and its derivatives from bio-oils based on a heterogeneous extraction technique 基于异构萃取技术从生物油中高效分离和萃取愈创木酚及其衍生物

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2024-09-24 DOI: 10.1016/j.seppur.2024.129739

To fully utilized the high value-added phenolic compounds in biomass pyrolysis bio-oils, a heterogeneous extraction method was developed in this study to separate 4-ethylguaiacol, guaiacol, and eugenol from bio-oil one by one. Based on the high selectivity of coordination intermediates generated between Ca²⁺ and phenolic compounds with hydroxyl and methoxy groups towards the parent phenol, the reaction intermediate between each of 4-ethylguaiacol, guaiacol, eugenol and Ca²⁺ was used as the extracting agents. Influencing parameters investigated were the sequence of extracting three phenolic compounds from the model bio-oil, the optimal extraction conditions, and the Ca²⁺ distribution in the original extracting agents at the end of the reaction. The optimal extraction sequence was determined to be 4-ethylguaiacol, eugenol and guaiacol through the evaluation of multiple experiments changing their addition sequence. Under the conditions of 25 °C reaction temperature, 45 min reaction time, and pH value of 7, the extraction efficiency of 4-ethylguaiacol, eugenol and guaiacol from bio-oil reached 60.6 %, 46.1 % and 60.7 %, respectively. Meanwhile, the purity of these three phenolic compounds achieved 62.4 %, 90.0 % and 89.0 %.

为了充分利用生物质热解生物油中的高附加值酚类化合物，本研究开发了一种异构萃取法，从生物油中逐一分离出4-乙基愈创木酚、愈创木酚和丁香酚。基于 Ca2+ 与带羟基和甲氧基的酚类化合物之间产生的配位中间体对母体苯酚的高选择性，4-乙基愈创木酚、愈创木酚、丁香酚和 Ca2+ 之间的反应中间体被用作萃取剂。研究的影响参数包括从模型生物油中萃取三种酚类化合物的顺序、最佳萃取条件以及反应结束时原始萃取剂中 Ca2+ 的分布。通过改变4-乙基愈创木酚、丁香酚和愈创木酚的添加顺序的多次实验评估，确定了最佳萃取顺序为4-乙基愈创木酚、丁香酚和愈创木酚。在反应温度为 25 ℃、反应时间为 45 分钟、pH 值为 7 的条件下，生物油中 4-乙基愈创木酚、丁香酚和愈创木酚的萃取效率分别达到 60.6%、46.1% 和 60.7%。同时，这三种酚类化合物的纯度也分别达到了 62.4%、90.0% 和 89.0%。

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引用次数: 0