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Supramolecular solvent-based-vortex-assisted-dispersive liquid liquid microextraction of Sudan Black B in food samples prior to spectrophotometric detection. 分光光度法检测食品样品中苏丹黑 B 前的超分子溶剂涡流辅助分散液相微萃取。
IF 1.3 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-01-02 eCollection Date: 2024-01-01 DOI: 10.55730/1300-0527.3661
Figen Erek, Mustafa Tüzen

A new, simple and rapid spectrophotometric method was developed for determination of Sudan Black B in food products by supramolecular solvent-based-vortex-assisted-dispersive liquid liquid microextraction (SUPRAS-VA-DLLME). Extraction solvent type, volume of solvent, pH, volume of THF, centrifugation time, vortex time, and sample volume were investigated as optimization parameters of the developed method. Under the optimum conditions, limit of detection and limit of quantification, preconcentration factor and enhancement factor of the developed method were calculated to be 9.01 μg L-1, 29.73 μg L-1, 20, and 55, respectively. The developed microextraction method was successfully applied to food samples for the determination of Sudan Black B.

建立了基于超分子溶剂-涡旋辅助分散液相微萃取(SUPRAS-VA-DLLME)测定食品中苏丹黑B的简便、快速的分光光度法。考察了萃取溶剂类型、溶剂体积、pH值、四氢呋喃体积、离心时间、涡旋时间和样品体积等参数,并对这些参数进行了优化。在最佳条件下,计算得出该方法的检出限、定量限、预富集因子和增强因子分别为9.01 μg L-1、29.73 μg L-1、20和55。所建立的微萃取方法成功地应用于食品样品中苏丹黑 B 的测定。
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引用次数: 0
Hydroxyl-terminated dendrimers with sulfonimide linkers as binders for metals of industrial significance. 具有磺酰亚胺连接体的羟基端树枝状聚合物作为具有工业重要性的金属的粘合剂。
IF 1.4 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-01-02 eCollection Date: 2024-01-01 DOI: 10.55730/1300-0527.3641
Khaleel Abu Sbeih, Mohammad Al Harahsheh

First- and second-generation hydroxyl-terminated dendrimers were prepared starting from a 1,3-diaminopropane core and sulfonimide linkers. A first-generation mesitylene-derived dendrimer was also prepared with the same terminals. The dendrimers were then reacted with Fe3+, Al3+, and UO22+ separately in order to apply the dendrimers for binding these metals, which have important industrial applications and pose environmental problems simultaneously. The prepared dendrimers were also shown to bind Fe3+ selectively from mixtures with Al3+.

以 1,3-二氨基丙烷核心和磺酰亚胺连接体为起点,制备了第一代和第二代羟基端树枝状聚合物。此外,还用相同的末端制备了第一代间二甲苯衍生树枝状聚合物。然后分别将树枝状聚合物与 Fe3+、Al3+ 和 UO22+ 反应,以便将树枝状聚合物用于结合这些金属,因为这些金属具有重要的工业应用价值,同时也带来环境问题。制备的树枝状聚合物还能从与 Al3+ 的混合物中选择性地结合 Fe3+。
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引用次数: 0
Preparation of a chiral hyperbranched polymer based on cinchona alkaloids and investigation of its catalytic activity in asymmetric reactions. 基于金鸡纳生物碱的手性超支化聚合物的制备及其在不对称反应中的催化活性研究。
IF 1.3 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-01-02 eCollection Date: 2024-01-01 DOI: 10.55730/1300-0527.3677
Rafiqul Islam, Mohammad Shahid Ullah, Md Abdus Salam, Shinichi Itsuno

Cinchona alkaloid-derived sulfonamides and ester dimers containing chiral hyperbranched polymers have been successfully synthesized and applied as catalysts in asymmetric reactions. Several hyperbranched polymers derived from cinchona alkaloids, incorporating sulfonamides and esters, were synthesized through Mizoroki-Heck coupling polymerization. These polymers were subsequently applied in enantioselective Michael addition reactions. As the prepared polymers are not soluble in frequently used organic solvents, they act as efficient catalysts in the enantioselective reaction of β-ketoesters to nitroolefins, achieving up to 99% enantioselectivity with good yields. The insoluble property allows them to better satisfy "green chemistry" requirements and be used several times without losing the enantioselectivity.

含有手性超支化聚合物的金鸡纳生物碱衍生磺酰胺和酯二聚体已被成功合成并用作不对称反应的催化剂。通过 Mizoroki-Heck 偶联聚合法合成了几种由金鸡纳生物碱衍生的、包含磺酰胺和酯的超支化聚合物。这些聚合物随后被应用于对映体选择性迈克尔加成反应。由于所制备的聚合物不溶于常用的有机溶剂,因此在 β 酮酯与硝基烯烃的对映体选择性反应中可作为高效催化剂,实现高达 99% 的对映体选择性和良好的产率。不溶性使它们能够更好地满足 "绿色化学 "的要求,并可多次使用而不会失去对映选择性。
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引用次数: 0
Recent advances and applications of nanostructured membranes in water purification. 纳米结构膜在水净化方面的最新进展和应用。
IF 1.4 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-12-11 eCollection Date: 2024-01-01 DOI: 10.55730/1300-0527.3635
Didem Aydin, İlkay Hilal Gübbük, Mustafa Ersöz

In recent years, water pollution caused by hazardous materials such as metals, drugs, pesticides, and insecticides has become a very serious environmental and health problem that needs to be addressed urgently. The nutritional needs associated with the increasing population also increase the demand for water use and rapidly increase the rate of freshwater consumption. Since most of the water in the universe is in the form of sea water, which cannot be directly used, freshwater resources are limited, compared to the existing available water. When addressing the purification of all kinds of pollution in environmental research, nanostructured membranes attract attention as alternative solutions for water treatment. Nanostructured membranes, which can be used for filtration and water treatment process, are summarized in recent research. Various types of nanostructured membranes are presented and used to remove salts and metallic ions in water treatment processes. The representations and application areas of these membrane systems are explained. Consequently, new water treatment nanostructured membranes that can be developed and their effective separation performances are described. The benefits of nanostructured membranes for water treatment and their progress in purification are discussed.

近年来,金属、药物、农药和杀虫剂等有害物质造成的水污染已成为一个非常严重的环境和健康问题,亟待解决。与人口增长相关的营养需求也增加了对水的使用需求,并迅速提高了淡水消耗率。由于宇宙中的大部分水都以海水的形式存在,无法直接利用,因此与现有的可用水量相比,淡水资源是有限的。在环境研究中解决各种污染的净化问题时,纳米结构膜作为水处理的替代解决方案备受关注。最近的研究总结了可用于过滤和水处理过程的纳米结构膜。介绍了各种类型的纳米结构膜,并将其用于去除水处理过程中的盐分和金属离子。还解释了这些膜系统的代表性和应用领域。因此,介绍了可开发的新型水处理纳米结构膜及其有效的分离性能。讨论了纳米结构膜在水处理方面的益处及其在净化方面的进展。
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引用次数: 0
Structure-activity relationship of anticancer drug candidate quinones. 抗癌候选药物醌类化合物的结构-活性关系。
IF 1.4 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-12-08 eCollection Date: 2024-01-01 DOI: 10.55730/1300-0527.3647
Nadire Özenver, Neslihan Sönmez, Merve Yüzbaşioğlu Baran, Merve Yüzbaşioğlu Baran, Ayşe Uz, Lütfiye Ömür Demirezer

Breast cancer is one of the most prevalent cancer types worldwide. Chemotherapy is a substantial approach in the management of breast cancer despite the occurrence of chemotherapy-associated side effects and the development of multidrug resistance in cancer cells. At this point, a variety of quinone derivatives may represent potential as possible anticancer drug candidates due to possessing structural similarity towards clinically used anticancer drugs like doxorubicin. Therefore, we investigated the cytotoxic effects of various quinone derivatives with structural diversity towards a variety of breast cancer cells. We further determined their toxicity in healthy cells to evaluate their drug capability potential. Eighteen quinone derivatives (arbutin, hydroquinone, alkannin, lapachol, lawsone, juglone, aloe-emodin, aloin, cascaroside A (8-O-β-D-glucoside of 10-C-D-glucosyl aloe-emodin anthrone), chrysophanol, chrysophanol-8-O-β-D-glucoside, emodin, emodin-8-O-β-D-glucoside, frangulin A (emodin-6-O-a-L-rhamnoside), physcion, rhein, sennoside A, sennoside B (sennoside A and sennoside B are stereoisomers and rhein-dianthrone diglycosides in which β-D-glucose units are bound to the OH groups of rhein anthrones at their 8th positions) were tested on MCF-7, SK-BR-3, MDA-MB-468, and MDA-MB-231 breast cancer cells and on H9c2 healthy rat cardiac myoblast cells in terms of their cytotoxicity and toxicity, respectively. The resazurin reduction assay was used to determine the cytotoxicity. Among the tested compounds, two naphthoquinone derivatives alkannin and juglone exhibited remarkable cytotoxicity on breast cancer cells and exhibited alleviated toxicity profiles on healthy cells deserving further investigation as possible drug candidates against breast cancer. Structure-activity relationships of these compounds were also evaluated and discussed. Alkannin and juglone, which are naphthoquinone derivatives isolated from natural sources, may be promising agents in the development of drug-candidate molecules with increased efficacy and safety for breast cancer.

乳腺癌是全球发病率最高的癌症类型之一。化疗是治疗乳腺癌的重要方法,尽管化疗会产生副作用,癌细胞也会产生多药耐药性。在这一点上,各种醌类衍生物由于与临床上使用的抗癌药物(如多柔比星)具有结构相似性,可能具有作为候选抗癌药物的潜力。因此,我们研究了具有结构多样性的各种醌衍生物对多种乳腺癌细胞的细胞毒性作用。我们还进一步测定了它们在健康细胞中的毒性,以评估其潜在的药物能力。18 种醌类衍生物(熊果苷、对苯二酚、鞣花苷、拉帕醌、罗布麻苷、朱格隆、芦荟大黄素、芦荟苷、卡斯卡洛苷 A(10-C-β-D-葡萄糖基芦荟大黄素蒽酮的 8-O-β-D-葡萄糖苷)、菊醇、菊醇-8-O-β-D-葡萄糖苷、大黄素、大黄素-8-O-β-D-葡萄糖苷、番泻苷 A(大黄素-6-O-a-L-鼠李糖苷)、麝香草苷、流苏苷、番泻苷 A、对 MCF-7、SK-BR-3、MDA-MB-468 和 MDA-MB-231 乳腺癌细胞以及 H9c2 健康大鼠心肌母细胞进行了细胞毒性和毒性试验。细胞毒性的测定采用了雷公藤苷还原试验。在测试的化合物中,两种萘醌衍生物 alkannin 和 juglone 对乳腺癌细胞具有显著的细胞毒性,而对健康细胞的毒性则有所减轻,值得作为可能的乳腺癌候选药物进一步研究。此外,还对这些化合物的结构-活性关系进行了评估和讨论。Alkannin 和 juglone 是从天然资源中分离出来的萘醌衍生物,它们可能是开发对乳腺癌更有效、更安全的候选药物分子的有前途的药物。
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引用次数: 0
Optimized intermediate layer formation and electroless plating methods to obtain supported dense Pd surfaces. 优化中间层形成和化学电镀方法,获得支撑致密的钯表面。
IF 1.4 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-12-07 eCollection Date: 2024-01-01 DOI: 10.55730/1300-0527.3651
Gamze Gümüşlü Gür, Berna Toprak

Dense metallic membranes, especially Pd and Pd alloys, have been intensely investigated to provide an alternative and economical way to obtain H2 with ultrahigh purity. To overcome the high cost of Pd, composite membrane structures that comprise a thin layer of Pd are utilized. However, it is a challenge to obtain a thin, dense, and uniform Pd layer on the support materials. This study investigates the parametric analysis of γ-Al2O3 interlayer formation and the electroless Pd plating (Pd ELP) procedures on α-Al2O3 supports with the aim to achieve a thin, uniform Pd surface without annealing. Adjustments in PEG/PVA concentration, dipping time, and heat treatment enabled creating a thin γ-Al2O3 interlayer on α-Al2O3, minimizing pore size and density. Hydrazine concentration, heat treatment, and bath temperature were adjusted to optimize Pd ELP to achieve maximum yield from the plating bath and a dense, uniform surface without annealing. Pd/γ-Al2O3/α-Al2O3 structures were analyzed using scanning electron microscopy, X-ray diffraction, and thermogravimetric analysis to observe the impact of varied parameters on surface structures. Optimized sample was compared to an annealed Pd/α-Al2O3 prepared in accordance with literature methods and a Pd/graphite/α-Al2O3 sample to validate the use of optimized ELP procedure and the γ-Al2O3 interlayer. Results show that a dense and uniform 13 μm Pd coating was achieved on a γ-Al2O3-coated α-Al2O3 support without annealing, using three fresh ELP baths. This was done using sequential hydrazine addition with a decreased concentration (1 M) into the ELP baths at 30 °C, and applying heat treatment at 120 °C between each fresh ELP bath.

人们对致密金属膜,特别是钯和钯合金进行了深入研究,以提供一种替代性的经济方法来获得超高纯度的 H2。为了克服钯的高成本,人们采用了由一层薄钯组成的复合膜结构。然而,如何在支撑材料上获得薄、致密、均匀的钯层是一项挑战。本研究探讨了γ-Al2O3 层间形成的参数分析以及在α-Al2O3 支持材料上进行无电解钯电镀(Pd ELP)的程序,目的是在不退火的情况下获得薄而均匀的钯表面。通过调整 PEG/PVA 浓度、浸渍时间和热处理,可在α-Al2O3 上形成薄的γ-Al2O3 夹层,最大限度地减小孔径和密度。通过调整肼浓度、热处理和镀液温度来优化 Pd ELP,以实现镀液的最大产率和无需退火的致密均匀表面。利用扫描电子显微镜、X 射线衍射和热重分析对 Pd/γ-Al2O3/α-Al2O3 结构进行了分析,以观察不同参数对表面结构的影响。将优化样品与根据文献方法制备的退火 Pd/α-Al2O3 样品和 Pd/ 石墨/α-Al2O3 样品进行了比较,以验证优化 ELP 程序和 γ-Al2O3 夹层的使用。结果表明,使用三个新的 ELP 浴,γ-Al2O3 涂层的 α-Al2O3 支持物上无需退火即可获得致密均匀的 13 μm Pd 涂层。具体做法是在 30 ℃ 的 ELP 浴中依次加入浓度降低(1 M)的肼,并在每个新的 ELP 浴之间进行 120 ℃ 的热处理。
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引用次数: 0
Nonoxidative dehydrogenation of propane using boron-incorporated silica-supported Pt Sites synthesized by atomic layer deposition. 利用原子层沉积法合成的硼掺杂二氧化硅支撑的 Pt Sites 对丙烷进行非氧化脱氢。
IF 1.4 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-12-04 eCollection Date: 2024-01-01 DOI: 10.55730/1300-0527.3648
Gökhan Çelik

Nonoxidative dehydrogenation of propane to propylene using Pt-based supported catalysts is an active research area in catalysis because catalyst attributes of Pt sites can be controlled by careful design of active sites. One way to achieve this is by the addition of a second metal that may impart a change in the electron density of active sites, which in turn affects catalytic performance. In this study, bimetallic Pt and B sites were deposited on powder SiO2 using atomic layer deposition (ALD). Boron was first deposited on SiO2 via half-cycle ALD using triisoproplyborate as the B source. Following calcination, Pt deposition was performed via half-cycle ALD using trimethyl(methylcyclopentadienyl)platinum(IV) as the Pt source. The synthesized catalysts were reduced under H2 at 550 °C and characterized using inductively coupled plasma optical emission spectroscopy for elemental analysis, diffuse reflectance infrared Fourier transform spectroscopy of adsorbed CO to examine the properties of Pt, and time-resolved X-ray absorption near edge structure spectroscopy to examine the changes in the reducibility of Pt sites. The samples were then tested for nonoxidative dehydrogenation of propane at 550 °C using a fixed-bed plug-flow reactor to examine the role of B on the catalytic performance. Characterization results showed that the addition of B imparted an increase in electron density and affected the reducibility of Pt sites. In addition, incorporating B on SiO2 created anchoring sites for Pt ALD. The amount of Pt deposited on B/SiO2 was 2.2 times that on SiO2. Catalytic activity results revealed the addition of B did not change the initial activity of Pt sites significantly, but improved propylene selectivity from 80% to 87% and stability almost threefold. The enhanced selectivity and stability of PtB/SiO2 is most presumably due to favored desorption of propylene and mitigating coke formation under reaction conditions, respectively.

使用铂基支撑催化剂将丙烷非氧化脱氢为丙烯是催化领域一个活跃的研究领域,因为铂位点的催化剂属性可以通过精心设计活性位点来控制。实现这一目标的方法之一是添加第二种金属,这种金属可能会改变活性位点的电子密度,进而影响催化性能。本研究利用原子层沉积(ALD)技术在粉末二氧化硅上沉积了双金属铂和硼位点。首先使用三异丙基硼酸盐作为硼源,通过半周期 ALD 在二氧化硅上沉积硼。煅烧后,使用三甲基(甲基环戊二烯基)铂(IV)作为铂源,通过半周期 ALD 进行铂沉积。合成的催化剂在 550 °C 的 H2 条件下进行还原,并使用电感耦合等离子体光发射光谱进行元素分析,使用吸附 CO 的漫反射红外傅立叶变换光谱检测铂的性质,以及使用时间分辨 X 射线吸收近边缘结构光谱检测铂位点还原性的变化。然后,利用固定床塞流反应器对样品进行了 550 °C 丙烷非氧化脱氢试验,以考察 B 对催化性能的影响。表征结果表明,硼的加入增加了电子密度,并影响了铂位点的还原性。此外,在二氧化硅上加入 B 还为铂的 ALD 创造了锚定位点。B/SiO2 上的铂沉积量是 SiO2 上的 2.2 倍。催化活性结果表明,B 的加入并没有显著改变铂位点的初始活性,但丙烯选择性从 80% 提高到 87%,稳定性提高了近三倍。PtB/SiO2 的选择性和稳定性的提高很可能是由于在反应条件下分别促进了丙烯的解吸和减少了焦炭的形成。
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引用次数: 0
Exploration of novel 6,8,9-trisubstituted purine analogues: synthesis, in vitro biological evaluation, and their effect on human cancer cells. 新型 6、8、9-三取代嘌呤类似物的探索:合成、体外生物学评价及其对人类癌细胞的影响。
IF 1.4 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-12-04 eCollection Date: 2024-01-01 DOI: 10.55730/1300-0527.3643
Muhammed Fatih Polat, İrem Durmaz Şahin, Rengül Atalay, Meral Tunçbilek

Cancer, a leading global cause of mortality, demands continuous advancements in therapeutic strategies. This study focuses on the design and synthesis of a novel series of purine derivatives, specifically 6-(substituted phenyl piperazine)-8-(4-phenoxyphenyl)-9-cyclopentyl purine derivatives (5-11). The motivation behind this endeavor lies in addressing acquired resistance mechanisms in cancer cells, a significant hurdle in current treatment modalities. The synthesis, starting from 4,6-dichloro-5-nitropyrimidine, involves a multi-step process, resulting in seven new purine derivatives. Biological evaluation against human liver, colon, and breast cancer cells (Huh7, HCT116, and MCF7, respectively) was performed using the SRB assay. Among the synthesized analogs, compounds 5 and 6, exhibited notable cytotoxic activity, surpassing clinically used positive controls 5-Fluorouracil and Fludarabine in terms of efficacy. This research underscores the potential of purine derivatives with a phenyl group at the C-8 position as a scaffold for developing compounds with improved anticancer properties. The findings offer insights for future exploration and development of novel agents in cancer pharmaceutical research.

癌症是导致全球死亡的主要原因之一,因此需要不断改进治疗策略。本研究的重点是设计和合成一系列新型嘌呤衍生物,特别是 6-(取代苯基哌嗪)-8-(4-苯氧基苯基)-9-环戊基嘌呤衍生物 (5-11)。这项工作的动机在于解决癌细胞的获得性抗药性机制,这是目前治疗方法的一个重大障碍。从 4,6-二氯-5-硝基嘧啶开始的合成涉及多个步骤,最终产生了七种新的嘌呤衍生物。利用 SRB 试验对人肝癌、结肠癌和乳腺癌细胞(分别为 Huh7、HCT116 和 MCF7)进行了生物学评估。在合成的类似物中,化合物 5 和 6 表现出显著的细胞毒性活性,其疗效超过了临床上使用的阳性对照 5-氟尿嘧啶和氟达拉滨。这项研究强调了在 C-8 位带有一个苯基的嘌呤衍生物作为支架开发具有更好抗癌特性的化合物的潜力。研究结果为今后探索和开发新型抗癌药物提供了启示。
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引用次数: 0
Sustainable bio-based solid phase extraction adsorbent for the determination of various types of organic compounds. 用于测定各类有机化合物的可持续生物基固相萃取吸附剂。
IF 1.4 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-11-27 eCollection Date: 2024-01-01 DOI: 10.55730/1300-0527.3637
Mustafa Zafer Özel, James H Clark, Avtar S Matharu

A sustainable, bio-based, mesoporous material, Starbon A800, was explored for use as an adsorbent in solid phase extraction (SPE). A solution containing seven nitrosamines was first used as a standard to optimise conditions for extraction efficiency with Starbon A800. After optimising conditions, 25 compounds of varying polarity (terpenes, phenolics, pesticides, PAHs, amines, and nitrosamines) were extracted with SPE using either Starbon® A800, C18 or Porous Graphitic Carbon (PGC) as the adsorbent, for comparison purposes. At the same time, 3 different elution solvents (heptane, dichloromethane, and ethanol) were used for each type of adsorbent. Hansen solubility parameters can be used to choose an appropriate elution solvent for the selected SPE adsorbent. The best average SPE recoveries found for the 25 various compounds were 83%, 79%, and 65% using Starbon A800, PGC, and C18 adsorbents respectively and these had dichloromethane as the elution solvent. The identification and quantification of components was carried out using UV-visible spectroscopy, two-dimensional gas chromatography (GCxGC) with time of flight/mass spectrometry (TOF/MS) or a nitrogen chemiluminescence detector (NCD). The optimized method was successfully applied to extract volatile organic compounds from red wine and tap water using Starbon A800. Starbon A800 was shown to be a promising, low-cost, green, scalable, alternative adsorbent for the extraction of various types of organic compounds of a wide range of polarities using SPE.

研究人员探索了一种可持续的生物基介孔材料 Starbon A800 在固相萃取 (SPE) 中用作吸附剂的可能性。首先以含有七种亚硝胺的溶液为标准,优化斯塔邦 A800 的萃取效率条件。优化条件后,使用 Starbon® A800、C18 或多孔石墨碳 (PGC) 作为吸附剂,用 SPE 提取了 25 种不同极性的化合物(萜烯、酚类、农药、多环芳烃、胺和亚硝胺),以进行比较。同时,每种吸附剂都使用了 3 种不同的洗脱溶剂(庚烷、二氯甲烷和乙醇)。汉森溶解度参数可用于为所选的固相萃取吸附剂选择合适的洗脱溶剂。使用 Starbon A800、PGC 和 C18 吸附剂对 25 种不同化合物的平均 SPE 回收率分别为 83%、79% 和 65%,这些化合物均以二氯甲烷作为洗脱溶剂。采用紫外-可见光谱、二维气相色谱-飞行时间/质谱(TOF/MS)或氮化学发光检测器(NCD)对成分进行了鉴定和定量。使用 Starbon A800 成功地将优化方法用于提取红葡萄酒和自来水中的挥发性有机化合物。结果表明,Starbon A800 是一种前景广阔、低成本、绿色、可扩展的吸附剂,可用于使用 SPE 萃取各种极性有机化合物。
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引用次数: 0
The effect of partial substitution of noble metal (Pd) at the B site of La0.6Sr0.4FeO3 as a supercapacitor electrode material. 在作为超级电容器电极材料的 La0.6Sr0.4FeO3 的 B 位上部分取代贵金属(钯)的影响。
IF 1.4 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-11-13 eCollection Date: 2024-01-01 DOI: 10.55730/1300-0527.3639
Nagihan Delibaş, Turgut Süleymanoğlu

Sol-gel combustion was used to produce the perovskite-type La0.6Sr0.4FeO3 (LSF) and La0.6Sr0.4Fe0.9Pd0.1O3 (LSFP) materials and assessed as supercapacitor electrodes. The synthesized materials' crystal structure, morphology, and electrochemical performance were thoroughly analyzed. The partial substitution of Pd in the B site of the LSF structure affected the electrochemical properties of this compound and improved its performance. In fact, the greatest effect of Pd substitution was on the content of oxygen vacancies, which are known as the active sites of the perovskite surface in the supercapacitor cell. The specific capacitance obtained for the sample containing Pd was about 80 F.g-1 at a current density of 1 A.g-1 in 1M KOH. In addition, this sample had a decreased intrinsic resistance to ion and electron diffusion. The remarkable structural and morphological features of LSFP contribute to its superior electrochemical performance. At a power density of 1000 W.kg-1 and a current density of 1 A.g-1, an LSFP symmetrical cell had an energy density of 44.45 W.h.kg-1.

利用溶胶-凝胶燃烧法制备了透辉石型 La0.6Sr0.4FeO3 (LSF) 和 La0.6Sr0.4Fe0.9Pd0.1O3 (LSFP) 材料,并对其作为超级电容器电极进行了评估。对合成材料的晶体结构、形貌和电化学性能进行了深入分析。在 LSF 结构的 B 位上部分取代 Pd 会影响该化合物的电化学特性并改善其性能。事实上,钯替代对氧空位含量的影响最大,而氧空位正是超级电容器电池中包晶石表面的活性位点。在 1M KOH 溶液中,电流密度为 1 A.g-1 时,含钯样品的比电容约为 80 F.g-1。此外,该样品还降低了离子和电子扩散的内在阻力。LSFP 显著的结构和形态特征造就了其卓越的电化学性能。在功率密度为 1000 W.kg-1 和电流密度为 1 A.g-1 时,LSFP 对称电池的能量密度为 44.45 W.h.kg-1。
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Turkish Journal of Chemistry
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