Colloids and Surfaces A: Physicochemical and Engineering Aspects最新文献_第7页

Efficient treatment of coking wastewater by coal-based activated carbon prepared through coal blending method 用配煤法制备的煤基活性炭高效处理焦化废水

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-04 DOI: 10.1016/j.colsurfa.2024.135675

Xiaoxin Gao , Yue Ju , Gefei Hou , Chunwei Liu

In this study, the adsorption performance of coal-based activated carbon produced from Shandong gas-fertilized coal, Taixi anthracite coal, and Datong weakly viscous coal, was investigated for coking wastewater treatment. All prepared activated carbons demonstrated excellent adsorption performance, boasting an iodine number surpassing 1000 mg/g and achieving a chemical oxygen demand determined by the dichromate method (COD_cr) removal rate of over 85 % under static coking wastewater adsorption. A positive correlation exists between the total pore volume of activated carbon and its iodine number, methylene blue value, and caramel decolorization rate. Furthermore, dynamic adsorption experiments were conducted and there was an evident increase in the COD_cr removal rate as the flow rate decreased. However, increasing the bed height beyond 400 mm only marginally enhanced the COD_cr removal rate. The burn-off rate of activated carbon and the ratio of raw materials significantly influenced the pore structure. Notably, with a high anthracite ratio (40 %), elevating the burn-off rate (up to 70 %) did not enhance the effective porosity of activated carbon. The mesopore volume, particularly within 1.2–2.8 nm range, exerted a substantial influence on the coking wastewater adsorption efficiency. Overall, coal-based activated carbon demonstrated significant promise as a cost-effective adsorbent for coking wastewater treatment.

本研究考察了以山东气肥煤、泰西无烟煤和大同弱粘煤为原料制备的煤基活性炭在焦化废水处理中的吸附性能。所有制备的活性炭均表现出优异的吸附性能，在静态焦化废水吸附条件下，碘数超过 1000 mg/g，重铬酸钾法测定的化学需氧量（CODcr）去除率超过 85%。活性炭的总孔容积与其碘数、亚甲基蓝值和焦糖脱色率之间存在正相关。此外，还进行了动态吸附实验，随着流速的降低，CODcr 的去除率明显增加。然而，将床层高度增加到 400 毫米以上，也只能略微提高 CODcr 去除率。活性炭的烧损率和原料配比对孔隙结构有显著影响。值得注意的是，在无烟煤比例较高（40%）的情况下，提高烧除率（高达 70%）并不能提高活性炭的有效孔隙率。中孔体积，尤其是 1.2-2.8 nm 范围内的中孔体积，对焦化废水的吸附效率有很大影响。总之，煤基活性炭作为一种经济高效的焦化废水处理吸附剂前景广阔。

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引用次数: 0

Iron complexes synthesized from FeOCl with carboxylic acid based ligands as Fenton-like catalysts for the highly efficient degradation of organic dyes over a wide pH range 由含有羧酸配体的 FeOCl 合成的铁络合物作为类似芬顿的催化剂，可在较宽的 pH 值范围内高效降解有机染料

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-04 DOI: 10.1016/j.colsurfa.2024.135697

Han Chen , Yuqi Liu , Tong Yan , Qi Wang , Nanhao Jin , Xinying Wang , Xiaoming Liu , Yue Zhao , Yuebin Feng , Huilong Luo , Wei Li

Iron-based materials have garnered significant attention as Fenton-like catalysts for the degradation of organic dyes. However, challenges remain in optimizing hydroxyl radical (•OH) utilization and broadening the effective pH range for practical applications. In this study, three iron-based catalysts (complex 1, 2, 3) were synthesized via a hydrothermal method, utilizing iron oxychloride (FeOCl) as the metal ion source and 4,5-imidazole dicarboxylic acid, furan-2,5-dicarboxylic acid, and 5-hydroxyisophthalic acid as ligands, respectively. The results indicate that these synthesized Fe-based catalysts exhibit enhanced visible light absorption and superior photo-Fenton activity, outperforming FeOCl in the degradation of rhodamine B (Rh-B), crystal violet (CV), and methylene blue (MB). Moreover, the Fe-based catalyst system operates effectively over a wide pH range (1–8) and efficiently degrades organic dyes. In free radical scavenging experiments, hydroxyl radicals (•OH) and superoxide radicals (•O₂^-) were identified as the primary agents responsible for photocatalytic degradation. Among the catalysts, complex 1 displayed notable stability, retaining its catalytic activity after three reuse cycles. This work presents a promising approach for designing highly efficient and stable Fenton-like catalysts, offering excellent environmental remediation capabilities across a broad pH range.

铁基材料作为降解有机染料的 Fenton 类催化剂，已经引起了广泛关注。然而，在优化羟基自由基（-OH）的利用和扩大实际应用的有效 pH 值范围方面仍然存在挑战。本研究以氧氯化铁（FeOCl）为金属离子源，分别以 4,5-咪唑二羧酸、呋喃-2,5-二羧酸和 5-羟基间苯二甲酸为配体，通过水热法合成了三种铁基催化剂（复合物 1、2、3）。结果表明，这些合成的铁基催化剂在降解罗丹明 B（Rh-B）、结晶紫（CV）和亚甲基蓝（MB）方面表现出更强的可见光吸收能力和更优越的光-芬顿活性，其性能优于 FeOCl。此外，该铁基催化剂系统可在较宽的 pH 值范围（1-8）内有效运行，并能高效降解有机染料。在自由基清除实验中，羟自由基（-OH）和超氧自由基（-O2-）被确定为光催化降解的主要物质。在这些催化剂中，复合物 1 显示出显著的稳定性，在重复使用三个周期后仍能保持其催化活性。这项工作为设计高效、稳定的 Fenton 类催化剂提供了一种前景广阔的方法，可在广泛的 pH 值范围内提供出色的环境修复能力。

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引用次数: 0

The key role of the second material's OER activity on MOR durability enhancement of the Pt alloys 第二种材料的 OER 活性对铂合金 MOR 耐久性增强的关键作用

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-04 DOI: 10.1016/j.colsurfa.2024.135702

Zhiyi Zeng , Yue Chen , Jun Huang , Ya Jin , Xiaoqiang Wu

Pt-based precious metal catalysts are generally regarded as the best catalyst materials for direct methanol fuel cells due to their high inherent methanol oxidation (MOR) activity. However, the commercial application of Pt catalyst is still facing with severe durability problem. The CO formed by the incomplete oxidation of methanol will occupy the Pt active site, hindering the further progress of the MOR reaction and causing the rapid attenuation of the activity. In this work, a MOR durability enhancement strategy that relation to the OER performance of the second materials M (M=Ni, Co, Fe and Cu) is reported. The precise electrochemical test results showed that the MOR durability of Pt-M alloy changes with the second material, which is related to the OER activity of M materials. The smaller the overpotential and tafel slopes of the M material, the better the MOR durability. Via M material screening, the Co element with the lowest OER overpotential among M promoted the Pt-Co alloy material with the highest MOR durability, resulting an excellent durability sustain 7000 times CV cycles with just 0.53 A mg⁻¹_Pt mass activity loss. According to the current generally accepted OER and MOR reaction mechanism, the association of MOR durability with OER activity is most likely derived from the same reaction step of M-OH formation, which played a key role on both reaction. This relationship between OER overpotential and MOR durability helps to screen the second material from the perspective of OER activity to improve the MOR durability of Pt catalysts, which is of great significance for the development of Pt-based CO-resistant MOR catalysts.

铂基贵金属催化剂因其固有的高甲醇氧化（MOR）活性，被普遍认为是直接甲醇燃料电池的最佳催化剂材料。然而，铂催化剂的商业应用仍然面临着严重的耐久性问题。甲醇不完全氧化形成的 CO 会占据铂的活性位点，阻碍 MOR 反应的进一步进行，导致活性迅速衰减。本文报告了一种与第二种材料 M（M=Ni、Co、Fe 和 Cu）的 OER 性能相关的 MOR 耐久性增强策略。精确的电化学测试结果表明，铂-锰合金的 MOR 耐久性随第二种材料的变化而变化，这与 M 材料的 OER 活性有关。M 材料的过电位和塔菲尔斜率越小，MOR 耐久性越好。通过对 M 材料的筛选，M 材料中 OER 过电位最低的 Co 元素促进了 MOR 耐久性最高的铂钴合金材料的产生，使其在仅有 0.53 A mg-1Pt 质量活度损失的情况下维持了 7000 次 CV 循环，耐久性极佳。根据目前公认的 OER 和 MOR 反应机理，MOR 耐久性与 OER 活性的关联很可能来自于 M-OH 形成的同一反应步骤，而 M-OH 在这两个反应中都起着关键作用。OER过电位与MOR耐久性之间的关系有助于从OER活性的角度筛选第二种材料，从而提高铂催化剂的MOR耐久性，这对开发铂基抗CO MOR催化剂具有重要意义。

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引用次数: 0

Construction and properties of highly efficient Ag6Si2O7/C-WO3 visible light photocatalyst for water purification 用于水净化的高效 Ag6Si2O7/C-WO3 可见光光催化剂的构造和特性

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-04 DOI: 10.1016/j.colsurfa.2024.135700

Fangxiao Wang, Shundi Xia, Xinru Qin

Photocatalytic oxidation decomposes large molecules of organic pollutants that are difficult to biodegrade in a short period of time is a promising and effective strategy to alleviate water environmental crises. However, designing efficient, stable, and long-lasting photocatalysts remains a challenge. This article integrates C-WO₃ with Ag₆Si₂O₇ to form a Ag₆Si₂O₇/C-WO₃ heterojunction for the degradation of organic pollutants under visible light. This catalyst can capture a wider range of visible light and disperse photogenerated charges more efficiently, thus demonstrating extraordinary photocatalytic performance in photocatalytic oxidation and decomposition of large organic pollutants. After visible light irradiation for 40 min, the removal rate of organic matter reached 99.1 %, and the rate constant reached 0.0931 min⁻¹, which is 35.1 and 13.5 times that of WO₃ and C-WO₃ under the same conditions. Through free radical capture experiments, it was found that h⁺ plays a dominant role in photocatalytic reactions. In view of the analysis of valence band positions, a reasonable photocatalytic mechanism diagram including photo generated electron transfer pathways was drawn. This undertaking affords a new idea for constructing efficient photocatalysts for water purification.

光催化氧化能在短时间内分解难以生物降解的大分子有机污染物，是缓解水环境危机的一种前景广阔的有效策略。然而，设计高效、稳定、长效的光催化剂仍是一项挑战。本文将 C-WO3 与 Ag6Si2O7 整合成 Ag6Si2O7/C-WO3 异质结，用于在可见光下降解有机污染物。这种催化剂能捕获更广范围的可见光，更有效地分散光生电荷，因此在光催化氧化和分解大型有机污染物方面表现出非凡的光催化性能。可见光照射 40 分钟后，有机物的去除率达到 99.1%，速率常数达到 0.0931 min-1，分别是相同条件下 WO3 和 C-WO3 的 35.1 倍和 13.5 倍。通过自由基捕获实验发现，h+ 在光催化反应中起主导作用。根据价带位置分析，绘制出了包括光生电子转移途径在内的合理光催化机理图。这项研究为构建用于水净化的高效光催化剂提供了新思路。

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引用次数: 0

Effect of Fe3+ doping on the electronic structure and surface hydration properties of quartz 掺杂 Fe3+ 对石英电子结构和表面水合特性的影响

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-04 DOI: 10.1016/j.colsurfa.2024.135689

Chunfu Liu , Weitao Wang , Han Wang , Chenyu Zhu , Bao Ren , Jianfeng Zhao , Fanfei Min

In this study, the effects of Fe³⁺ doping on the crystal structure and surface properties of quartz were analyzed using density functional theory (DFT) calculations and molecular dynamics (MD) simulations. The crystal structure, surface model, and adsorption model of the water molecule layer for Fe³⁺-doped α-quartz were established. The DFT calculations reveal that Fe³⁺ doping affects the α-quartz lattice parameters and surface active sites. The adsorption energy near the sites occupied by Fe³⁺ is −66.20 kJ/mol, which is considerably lower than that of the undoped system (−42.35 kJ/mol). This makes it easier for water molecules to be adsorbed on the Fe³⁺-doped α-quartz (001) surface. The frontier orbital energy, electron density difference, charge density, and Mulliken bond population analyses indicate that the presence of Fe³⁺ improves the ability of the (001) surface of α-quartz to attract and bind water molecules. This improvement is mainly due to the formation of hydrogen bonds between the surface hydroxyl groups and water molecules on the surface of Fe³⁺-doped quartz and the equilibrium of the electrostatic interaction between the cation and water molecules. MD simulations show that a hydration layer with a thickness of approximately 8 Å is formed on the surface of Fe³⁺-doped α-quartz. Compared with the undoped system, the hydration film on the surface of the doped system is thicker, indicating that the incorporation of Fe³⁺ impurities in the lattice enhances the surface hydration characteristics of quartz. These results offer theoretical guidance for achieving efficient separation and thorough purification of quartz.

本研究采用密度泛函理论（DFT）计算和分子动力学（MD）模拟，分析了掺杂 Fe3+ 对石英晶体结构和表面性质的影响。建立了掺杂 Fe3+ 的 α- 石英的晶体结构、表面模型和水分子层吸附模型。DFT 计算表明，掺杂 Fe3+ 会影响α-石英的晶格参数和表面活性位点。Fe3+ 所占位点附近的吸附能为 -66.20 kJ/mol，大大低于未掺杂体系的吸附能（-42.35 kJ/mol）。这使得水分子更容易吸附在掺杂了 Fe3+ 的 α-quartz (001) 表面上。前沿轨道能、电子密度差、电荷密度和 Mulliken 键群分析表明，Fe3+ 的存在提高了 α-quartz (001) 表面吸引和结合水分子的能力。这种改善主要是由于掺杂了 Fe3+ 的石英表面羟基和水分子之间形成了氢键，以及阳离子和水分子之间的静电作用达到了平衡。MD 模拟显示，掺杂 Fe3+ 的 α- 石英表面形成了厚度约为 8 Å 的水合层。与未掺杂体系相比，掺杂体系表面的水合膜更厚，这表明在晶格中加入 Fe3+ 杂质增强了石英的表面水合特性。这些结果为实现石英的高效分离和彻底提纯提供了理论指导。

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引用次数: 0

A novel bio-aerogel based on agroforestry waste chestnut shell for enhanced oil-water separation performance 基于农林废弃栗壳的新型生物气凝胶可提高油水分离性能

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-04 DOI: 10.1016/j.colsurfa.2024.135701

Ci Wei , Mengxue Li , Hui Wang , Yang Liu , Shunlin Li , Xinyu Li , Zhaoyong Bian

Bio-based aerogels have attracted much attention due to their biodegradability and excellent oil-water separation properties. However, the preparation of inexpensive green aerogels with high separation efficiency is still a great challenge. In this paper, low-density, high-adsorption capacity and superhydrophobic chestnut shell-based bio-aerogels were prepared by chemical cross-linking and chemical vapor deposition using agricultural and forestry waste chestnut shells as the precursor of aerogels to achieve high efficiency of oil-water separation and to achieve the goal of “treating waste with waste”. The covalent cross-linking of chestnut shell cellulose and cross-linking agent to form silicone-containing functional groups improved the pore structure, hydrophobicity and mechanical properties of chestnut shell cellulose, and under the action of capillary force, the oil was retained in the pores of the bio-aerogels, which achieved the selective adsorption of oil and organic solvents in the oil-water mixture, with a separation efficiency of more than 98 %. After 10 cycles, the bio-aerogel still has good reusability. This eco-friendly and low-cost aerogel provides a practical method for resource conversion and recycling, as well as a green and innovative way for the treatment of oily wastewater.

生物基气凝胶因其生物降解性和优异的油水分离性能而备受关注。然而，制备具有高分离效率的廉价绿色气凝胶仍是一项巨大挑战。本文以农林废弃物栗壳为气凝胶前驱体，通过化学交联和化学气相沉积法制备了低密度、高吸附容量、超疏水性的栗壳基生物气凝胶，实现了高效油水分离，达到了 "以废治废 "的目的。栗壳纤维素与交联剂共价交联形成含硅官能团，改善了栗壳纤维素的孔隙结构、疏水性和力学性能，在毛细力的作用下，油被截留在生物气凝胶的孔隙中，实现了对油水混合物中油和有机溶剂的选择性吸附，分离效率达98%以上。经过 10 次循环后，生物气凝胶仍具有良好的重复使用性。这种生态友好型低成本气凝胶为资源转化和循环利用提供了一种实用方法，也为含油废水的处理提供了一种绿色创新途径。

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引用次数: 0

Preparation of temperature-responsive smart sponge and its application in oil-water separation and dye adsorption 温度响应智能海绵的制备及其在油水分离和染料吸附中的应用

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-04 DOI: 10.1016/j.colsurfa.2024.135628

Cai Ling, Dai Yimin, Li Yaqi, Yang Siwen, Wang Junlong, Liu Bo, Ding Xianglong, Zhang Yue-Fei, Li Yan, Wan Li

At present, researchers are committed to studying new intelligent response materials to deal with severe water pollution problems. Using PU sponge as the substrate, dopamine was first modified to construct a rough surface while introducing active groups. The monomer N-isopropylacrylamide (NIPAM) and itaconic acid (IA) were grafted and polymerized onto the polydopamine coating on the sponge surface by vinyltrimethoxysilane (VTMS). The obtained DINA-PU sponge has good temperature response and switchable wettability characteristics, and has good adsorption-desorption cycle function. Moreover, a micro-filtration device was designed to separate heavy (light) oil-water mixtures. The separation efficiency can reach more than 95 % and 99 % for heavy and light oil-water, respectively. In addition, the adsorption capacity of the material for methylene blue (MB) can reach 660 mg·g⁻¹. The separation efficiency in the oil-water separation-dye adsorption integrated separation experiment can reach more than 99 %.

目前，研究人员正致力于研究新型智能响应材料，以应对严重的水污染问题。研究人员首先以聚氨酯海绵为基材，对多巴胺进行改性，在引入活性基团的同时构建出粗糙的表面。单体 N-异丙基丙烯酰胺（NIPAM）和衣康酸（IA）通过乙烯基三甲氧基硅烷（VTMS）接枝聚合到海绵表面的聚多巴胺涂层上。得到的 DINA-PU 海绵具有良好的温度响应和可切换的润湿特性，并具有良好的吸附-解吸循环功能。此外，还设计了一种微过滤装置来分离重（轻）油水混合物。重质油水和轻质油水的分离效率分别可达 95% 和 99% 以上。此外，该材料对亚甲基蓝（MB）的吸附能力可达 660 mg-g-1。在油水分离-染料吸附综合分离实验中，分离效率可达 99 % 以上。

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引用次数: 0

Fabrication and adsorption characteristics of cuprammonium cellulose-based membranes for removing anionic and cationic dyes 用于去除阴离子和阳离子染料的纤维素铜铵基膜的制造和吸附特性

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-02 DOI: 10.1016/j.colsurfa.2024.135692

Danish Iqbal , Raza Ullah , Muhammad Ilyas Sarwar , Renhai Zhao , Xin Ning

A cotton linter-based source was used to form conjugate electrospun membranes composed of cuprammonium cellulose, polyethylene oxide, and polyacrylonitrile for the removal of the anionic and cationic dyes from aqueous media. The highest removal efficiencies of 94 %, 89.9 %, 87.4 % were achieved for the anionic dyes Congo red (CR), Metanil yellow (MY), and Methyl orange (MO), respectively, and less so on the cationic dyes Crystal violet (CV), and Rhodamine B (RB) were 55.8 % and 15.1 %, respectively. The pseudo-second-order model effectively described the adsorption kinetics for both types of dyes. The composite membrane exhibited adsorption behaviors following the Dubinin-Radushkevich (D-R) isothermal model. Thermodynamics study suggests that the adsorption process was spontaneous except for the RB dye. The activation energy values of CR, MY, MO, CV, and RB dyes were 27.65, 21.17, 11.50, 10.47, and 71.12 kJ/mol, respectively, confirming the physisorption phenomenon for CR, MY, MO, and CV dyes, while chemisorption occurs for RB dyes. This study investigates the potential of a conjugate electrospun membranes as a reusable adsorbent for dye removal. The effects of solution pH, temperature, and dye concentration on adsorption performance were systematically evaluated. The conjugate electrospun membrane efficiency declined by only 10 % after undergoing five adsorption/desorption cycles.

利用基于棉衬垫的来源形成由纤维素铜铵、聚氧化乙烯和聚丙烯腈组成的共轭电纺丝膜，用于去除水介质中的阴离子和阳离子染料。阴离子染料刚果红（CR）、美他尼黄（MY）和甲基橙（MO）的去除率最高，分别为 94%、89.9% 和 87.4%；阳离子染料水晶紫（CV）和罗丹明 B（RB）的去除率较低，分别为 55.8% 和 15.1%。伪二阶模型有效地描述了这两种染料的吸附动力学。复合膜的吸附行为遵循 Dubinin-Radushkevich (D-R) 等温模型。热力学研究表明，除 RB 染料外，吸附过程是自发的。CR、MY、MO、CV 和 RB 染料的活化能值分别为 27.65、21.17、11.50、10.47 和 71.12 kJ/mol，证实了 CR、MY、MO 和 CV 染料的物理吸附现象，而 RB 染料的化学吸附现象。本研究探讨了共轭电纺丝膜作为可重复使用吸附剂去除染料的潜力。研究系统地评估了溶液 pH 值、温度和染料浓度对吸附性能的影响。经过五次吸附/解吸循环后，共轭电纺丝膜的效率仅下降了 10%。

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引用次数: 0

Anti-cancer and anti-microbial drug encapsulated lipid vesicles as drug delivery systems: Calorimetric and spectroscopic study 作为给药系统的抗癌和抗微生物药物封装脂质囊泡：量热和光谱研究

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-02 DOI: 10.1016/j.colsurfa.2024.135691

Harpreet Kaur , Nand Kishore

Lipid-based drug delivery systems (DDS) have attracted considerable interest for their capacity to achieve controlled drug release and encapsulate a variety of drug molecules—hydrophobic, hydrophilic, and amphiphilic—enabling diverse therapeutic applications. The research focuses on the structural and functional aspects of lipid-based vesicles that encapsulate both anti-cancer and anti-microbial drugs. The study employs ultrasensitive isothermal titration calorimetry and differential scanning calorimetry to gain mechanistic insights into the partitioning of drugs in the lipid-based DDS, release mechanisms, and binding interactions with serum proteins after the release.

The structural properties of 5-fluorouracil (5-FU) suggest that the drug can partition into the outer region of the bilayer, where it forms hydrogen bonds with the polar heads of the amphiphilic lipid chains. Kanamycin indicates strong partitioning into liposomes as it displays a binding constant of the order of 10⁶. Erythromycin exhibits limited partitioning into the bilayer, as assessed by fitting ITC data using a sequential two-binding site model. The values of change in enthalpy and entropy reflect the interaction nature and desolvation process during the drug's partitioning into liposomes. Thermodynamic signatures and transition temperatures obtained from ITC and DSC studies indicate that no diffusion-based drug release occurs from DPPC and DSPC-based liposomes. The interaction heat between the released drug and carrier serum albumin protein is very low and shows no consistent pattern. This suggests that the drugs are stably encapsulated in the drug delivery system (DDS), with no significant leakage over time. Insights from such studies on the influence of drug molecule structure on its partitioning into various lipid vesicles and further release of the same drugs from it guide in criteria for developing improvised drug delivery systems.

脂质给药系统（DDS）能够实现药物的可控释放，并能包裹各种药物分子--疏水性、亲水性和两亲性--从而实现多样化的治疗应用，因此备受关注。研究重点是脂基囊泡的结构和功能方面，这些囊泡可封装抗癌和抗微生物药物。研究采用超灵敏等温滴定量热法和差示扫描量热法，从机理上深入了解药物在脂基 DDS 中的分区、释放机制以及释放后与血清蛋白的结合相互作用。5-氟尿嘧啶（5-FU）的结构特性表明，该药物可以分区到双分子层的外部区域，在那里与两亲脂质链的极性头形成氢键。卡那霉素在脂质体中的结合常数为 106。红霉素在双分子层中的分配有限，这是用顺序双结合位点模型拟合 ITC 数据后得出的结果。焓和熵的变化值反映了药物分入脂质体过程中的相互作用性质和脱溶过程。从 ITC 和 DSC 研究中获得的热力学特征和转变温度表明，DPPC 和 DSPC 脂质体不会发生基于扩散的药物释放。释放出的药物与载体血清白蛋白之间的相互作用热非常低，而且没有显示出一致的模式。这表明药物被稳定地包裹在给药系统（DDS）中，随着时间的推移没有明显的泄漏。这些研究揭示了药物分子结构对其在各种脂质囊泡中的分配以及同种药物进一步释放的影响，为开发改进型给药系统提供了指导标准。

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引用次数: 0

Porphyrin modified ZnCo2O4 nanospheres as the excellent peroxidase/oxidase dual nanozymes for colorimetric sensing of cholesterol 卟啉修饰的 ZnCo2O4 纳米球是用于胆固醇比色传感的优异过氧化物酶/氧化酶双纳米酶

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-01 DOI: 10.1016/j.colsurfa.2024.135685

Ying Chu , Dexin Yin , Zhiwei Wang , Guijiang Li , Yijie Wang , Qingyun Liu , Kang Yue

5,10,15,20-Tetrakis(4-carboxyl phenyl)porphyrin (H₂TCPP) modified ZnCo₂O₄ nanospheres (H₂TCPP-ZnCo₂O₄) were prepared by a two-step hydrothermal method. Compared with pure ZnCo₂O₄, H₂TCPP-ZnCo₂O₄ possessed higher peroxidase-like activity and fast catalyze the chromogenic substrate 3,3,5,5-tetramethylbenzidine (TMB) into oxTMB by H₂O₂ with a blue change. The catalytic behaviors of H₂TCPP-ZnCo₂O₄ is consistent with the Michaelis–Menten equation. Several techniques including electrochemical, fluorescent probes and capture agents were used to investigate the catalytic mechanism, which was identified as electron transfer and superoxide radical (•O₂⁻), due to the synergetic effect between porphyrin molecules and ZnCo₂O₄. Based on the nanoperoxidase activity of H₂TCPP-ZnCo₂O_4, a facile colorimetric sensing platforms was designed for the determination of H₂O₂ and cholesterol. The linear range for H₂O₂ determination is 100–200 μM, with a detection limit of 76.297 μM as well as cholesterol is 100–900 μM, with a detection limit of 40.027 μM

采用两步水热法制备了 5,10,15,20-四（4-羧基苯基）卟啉（H2TCPP）修饰的 ZnCo2O4 纳米球（H2TCPP-ZnCo2O4）。与纯 ZnCo2O4 相比，H2TCPP-ZnCo2O4 具有更高的过氧化物酶样活性，能快速催化 H2O2 将发色底物 3,3,5,5-四甲基联苯胺（TMB）转化为 oxTMB，并呈现蓝色变化。H2TCPP-ZnCo2O4 的催化行为符合 Michaelis-Menten 方程。研究人员采用电化学、荧光探针和捕获剂等多种技术研究了催化机理，发现由于卟啉分子和 ZnCo2O4 之间的协同效应，催化机理为电子转移和超氧自由基（-O2-）。基于 H2TCPP-ZnCo2O4 的纳米过氧化物酶活性，设计了一种用于测定 H2O2 和胆固醇的简便比色传感平台。H2O2 的线性范围为 100-200 μM，检出限为 76.297 μM；胆固醇的线性范围为 100-900 μM，检出限为 40.027 μM。

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