Journal of the Indian Chemical Society最新文献_第3页

Magnetite based nanocomposite (Fe3O4@SGO): Photocatalytic and biological evaluation 基于磁铁矿的纳米复合材料（Fe3O4@SGO）：光催化和生物评估

IF 3.2 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society

Pub Date : 2024-10-26 DOI: 10.1016/j.jics.2024.101450

Shaily Sharma, Prakash Jakhar, Himanshu Sharma

Metal nanoparticle and sulfonated graphene oxide (SGO) nanocomposites have garnered growing consideration due to their varied range of possible applications in several arenas of materials science. This research study is focused around the utilization of the co-precipitation technique to successfully synthesize a highly efficient photocatalyst based on Fe₃O₄@SGO nanocomposite. To characterize the synthesized nanocomposite numerous methods like XRD, TGA, EDX, SEM, TEM as well as FT-IR were employed. The average nanoparticle size of FSGO is approximately 8.2 nm. The bandgap energy of the FSGO nanocomposite was determined to be 2.3 eV in the present study. UV–Vis data revealed that low band gap of the fabricated FSGO nanocomposite enhances photocatalytic dye breakdown efficiency by incorporating metal oxide nanoparticles (NPs) into the high specific surface area of SGO. This integration promotes effective charge transfer amongst the metal oxides as well as organic molecules, thereby improving overall performance. The developed nanocomposite demonstrates special properties including a significantly great stability, high surface area as well as competent recoverability. To assess the photocatalytic abilities of the produced nanocomposite, Rose Bengal (RB) dye was employed as a model water pollutant. The photocatalytic data exhibited a remarkable degradation rate with approximately 95 % degradation achieved within just 90 min. The reaction kinetics observed adhered to a pseudo-first-order model with a rate constant of 0.0326 min⁻¹. The nanocomposite demonstrates good MIC (Minimum inhibitory concentration) values against S. aureus at 50 (μg/mL) compared to the reference drugs (Chloramphenicol and Ciprofloxacin). Additionally, the antifungal assay data shows a favourable MIC value at 500 (μg/mL) against C. albicans when compared to the reference drug (Greseofulvin).

金属纳米粒子和磺化氧化石墨烯（SGO）纳米复合材料因其在材料科学多个领域的广泛应用而受到越来越多的关注。本研究的重点是利用共沉淀技术成功合成基于 Fe3O4@SGO 纳米复合材料的高效光催化剂。为了表征合成的纳米复合材料，研究人员采用了多种方法，如 XRD、TGA、EDX、SEM、TEM 和 FT-IR。FSGO 的平均纳米颗粒尺寸约为 8.2 纳米。本研究确定 FSGO 纳米复合材料的带隙能为 2.3 eV。紫外可见光数据显示，通过将金属氧化物纳米颗粒（NPs）与高比表面积的 SGO 结合，制备的 FSGO 纳米复合材料的低带隙提高了光催化染料分解效率。这种整合促进了金属氧化物和有机分子之间有效的电荷转移，从而提高了整体性能。所开发的纳米复合材料具有特殊的性能，包括显著的高稳定性、高比表面积和高可回收性。为了评估所制备的纳米复合材料的光催化能力，我们采用了玫瑰红（RB）染料作为模型水污染物。光催化数据显示了显著的降解率，仅在 90 分钟内就实现了约 95% 的降解。观察到的反应动力学符合伪一阶模型，速率常数为 0.0326 min-1。与参考药物（氯霉素和环丙沙星）相比，该纳米复合材料对金黄色葡萄球菌的最小抑菌浓度为 50 (μg/mL) ，具有良好的 MIC 值。此外，抗真菌检测数据显示，与参考药物（格列齐福韦）相比，500（μg/mL）的最低抑菌浓度值对白僵菌有较好的抑制作用。

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引用次数: 0

Promoting role of Europium on Multi-Walled Carbon Nanotube (MWCNT) supported Platinum catalyst for Ethanol Electro-Oxidation in Direct Alcohol Fuel Cell (DAFC) 多壁碳纳米管 (MWCNT) 支持的铂催化剂中的铕对直接酒精燃料电池 (DAFC) 中乙醇电氧化的促进作用

IF 3.2 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society

Pub Date : 2024-10-26 DOI: 10.1016/j.jics.2024.101449

Susmita Singh , Prodipta Pal , Moupiya Ghosh , Soumya Mukherjee , Prantica Saha , Anushna Dutta , Shalini Basak

Implementing rare earth metals with platinum for Ethanol Oxidation Reactions (EOR) has received significant interest in the promising DEFC. Incorporation of Europium, a rare earth metal, influences the electron density of the Pt, and the resulting catalytic activity is reinforced. Herein, different molar ratios of binary PtEu electrocatalysts supported over MWCNT were synthesized using the borohydride reduction method. The purpose of the investigation was to determine how the atomic structure, composition, and activity of the electrocatalyst correlate to the EOR. Structure, bulk composition, morphology, and bonding of the electrocatalyst were investigated through X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray (EDX), Fourier Transform Infrared (FTIR) spectroscopy, and RAMAN spectroscopy. Cyclic Voltammetry (CV), Linear Sweep Voltammetry (LSV), chronoamperometry (CA), and Electrochemical Impedance Spectroscopy (EIS) techniques were employed to probe the electro-oxidation kinetics on the electrocatalyst's surface. During the EOR circumstances, the PtEu electrocatalysts showed a captivating composition-structure-activity relationship, consistent with the findings. Notably, all the physical and electrochemical analyses demonstrate that the bimetallic composition of the 84:16 electrocatalyst has shown higher EOR activity through a bifunctional mechanism. The results provide novel insights into the ethanol oxidation process over bimetallic alloy electrocatalysts, which is crucial for designing robust and efficient electrocatalysts for DEFC.

将稀土金属与铂结合用于乙醇氧化反应（EOR），在前景广阔的 DEFC 中受到了极大关注。稀土金属铕的加入会影响铂的电子密度，从而增强催化活性。在此，我们采用硼氢化还原法合成了不同摩尔比的二元铂铕电催化剂。研究的目的是确定电催化剂的原子结构、组成和活性与 EOR 的相关性。通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、能量色散 X 射线 (EDX)、傅立叶变换红外光谱 (FTIR) 和 RAMAN 光谱分析了电催化剂的结构、块状成分、形态和键合。此外，还采用了循环伏安法（CV）、线性扫描伏安法（LSV）、时变分析法（CA）和电化学阻抗谱法（EIS）等技术来探究电催化剂表面的电氧化动力学。在 EOR 情况下，PtEu 电催化剂显示出迷人的成分-结构-活性关系，这与研究结果一致。值得注意的是，所有的物理和电化学分析表明，84:16 的双金属催化剂通过双功能机制表现出更高的 EOR 活性。这些结果为双金属合金电催化剂上的乙醇氧化过程提供了新的见解，这对于设计用于 DEFC 的稳健高效的电催化剂至关重要。

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引用次数: 0

Enhancing biodecolorization of Malachite Green by Flavobacterium sp. through monothetic analysis 通过单体分析增强黄杆菌对孔雀石绿的生物脱色作用

IF 3.2 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society

Pub Date : 2024-10-26 DOI: 10.1016/j.jics.2024.101452

Maegala Nallapan Maniyam , Primeela Gunalan , Hazeeq Hazwan Azman , Hasdianty Abdullah , Nor Suhaila Yaacob

Malachite Green (MG) is a prevalent dye in the textile industry, known for its harmful environmental impacts. Addressing the urgent need for environmentally friendly and cost-effective methods to remove MG from wastewater, this study investigated the efficacy of Flavobacterium sp., isolated from Malaysian batik wastewater, in decolorizing MG. Under shaking conditions at 160 rpm, Flavobacterium sp. exhibited a notable decolorization efficiency, with 91 % removal of MG after a 3-day incubation time, surpassing the static mode efficiency of 39 %. Further optimization using a one-factor-at-a-time (OFAT) methodology at 37 °C, pH 10, 6 % (v/v) inoculum, banana peel as the carbon source and 250 mg/L MG resulted in a remarkable enhancement, achieving 95 % decolorization within a reduced incubation time of 12 h. Moreover, repeated addition of 250 mg/L MG showed consistent and complete decolorization after 6 h by Flavobacterium sp. for four successive cycles, suggesting its economic viability for treating actual Malaysian batik wastewater. Ultraviolet–visible (UV) analysis confirmed the biodegradation of MG, evidenced by the disappearance of characteristic peaks at 618 nm and the appearance of new peaks, indicating the formation of metabolites. Flavobacterium sp. reduced pH, temperature, color, TDS, TSS, BOD and COD in batik wastewater, showing 99 % color removal efficiency. This research highlights its potential as an eco-friendly, cost-effective treatment for batik wastewater. The capacity of Flavobacterium sp. to decolorize MG in an immobilized state will be the subject of future research endeavors, aimed at elucidating the adaptability and usefulness of the biocatalyst.

孔雀石绿（MG）是纺织工业中的一种常用染料，以其对环境的有害影响而闻名。为了满足对环境友好且经济有效的去除废水中孔雀石绿的方法的迫切需求，本研究调查了从马来西亚蜡染废水中分离出来的黄杆菌对孔雀石绿的脱色效果。在每分钟 160 转的振荡条件下，黄杆菌表现出显著的脱色效率，经过 3 天的培养，MG 的去除率达到 91%，超过了静态模式下 39% 的去除率。在 37 °C、pH 值 10、6%（v/v）接种物、香蕉皮作为碳源和 250 mg/L MG 的条件下，使用一次一因素（OFAT）方法进行进一步优化，结果显著提高了脱色效率，在缩短的 12 小时培养时间内实现了 95% 的脱色率。此外，在连续四个循环中重复添加 250 mg/L MG，黄杆菌在 6 小时后显示出稳定和完全的脱色效果，这表明它在处理实际的马来西亚蜡染废水方面具有经济可行性。紫外可见光（UV）分析证实了 MG 的生物降解，618 纳米波长处特征峰的消失和新峰的出现证明了代谢物的形成。黄杆菌降低了蜡染废水的 pH 值、温度、色度、TDS、TSS、BOD 和 COD，色度去除率达到 99%。这项研究凸显了黄杆菌作为一种生态友好、经济高效的蜡染废水处理方法的潜力。黄杆菌在固定状态下对 MG 的脱色能力将是未来研究的主题，目的是阐明这种生物催化剂的适应性和实用性。

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引用次数: 0

Novel, low-cost, and environmentally friendly pathway for synthesizing tigecycline 新型、低成本、环保型替加环素合成途径

IF 3.2 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society

Pub Date : 2024-10-24 DOI: 10.1016/j.jics.2024.101441

Vandanaben Bhupatray Sompura , Rizwan Y. Ghumara , Naresh RanajiKiri , Tarunkumar N. Akhaja , Tushar Ravjibhai Sutariya , Samat Rama Ram , Jignesh Priyakant Raval , Keyur kumar A. Kamani

The development of tigecycline, effective against tetracycline-resistant bacteria, began with the synthesis of its precursor, 9-amino minocycline, derived from minocycline hydrochloride through nitration. Water served as the primary solvent, ensuring cost-effective processing. In the final step, conversion to tigecycline required only tert-butylglycinoyl chloride hydrochloride as a reactant. This method shows great potential for the sustainable production of tigecycline, making it more accessible for large-scale use as an antibiotic. Throughout the synthesis, various techniques such as IR, ¹H NMR, ¹³C NMR, and mass spectrometry were used to characterize each product at different stages.

替加环素对耐四环素细菌有效，其研发始于其前体--9-氨基米诺环素的合成，米诺环素是通过硝化从盐酸米诺环素中提取的。水作为主要溶剂，确保了加工过程的成本效益。在最后一步，转化为替加环素只需将盐酸叔丁基甘氨酰氯作为反应物。这种方法显示了可持续生产替加环素的巨大潜力，使其更容易大规模用作抗生素。在整个合成过程中，使用了红外光谱、1H NMR、13C NMR 和质谱分析等多种技术来表征不同阶段的每种产物。

引用次数: 0

Identification of natural compounds as potential antiviral drug candidates against Hepatitis E virus through molecular docking and dynamics simulations 通过分子对接和动力学模拟确定天然化合物作为潜在的戊型肝炎抗病毒候选药物

IF 3.2 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society

Pub Date : 2024-10-24 DOI: 10.1016/j.jics.2024.101446

Mohammad Borhan Uddin , P.K. Praseetha , Rony Ahmed , Mir Md Shaheen , Farah Chafika Kaouche , Rahul Dev Bairagi , Motasim Jawi , Hanan M. Alharbi , Alaa A. Khojah , Hesham M. Hassan , Ahmed Al-Emam

Hepatitis E virus (HEV) is a single-stranded RNA virus, capable of infecting both humans and animals. This investigation targets ORF2 of HEV, as it plays an essential role in forming viral capsid. Inhibiting the capsid protein could prevent the virus from completing its life cycle and infecting new cells, making ORF2 an ideal target for new drug development, and the primary objective of this investigation is to identify the potential therapeutic candidate against HEV.

The molecular docking analysis was conducted against the Hepatitis E virus ORF2 and out of the initially chosen 25 chemicals, eight demonstrated better binding affinities, particularly with Quercetin and Pinostrobin, which exhibited the most favorable binding energies. After that, theoretical ADMET analysis was analyzed to ensure the pharmacokinetics and safety profile of these therapeutic candidate. The stability of the maximum binding affinity containing compounds with the target protein was confirmed through molecular dynamics simulations over 100 ns timeframe.

The finding of this investigation is highlighted as strong antiviral properties against the HEV, supported by in silico analysis, suggesting the urgent need for cost-effective and time-efficient strategies to discover potential therapeutic candidate against HEV. Further, laboratory experiments together with pre-clinical and clinical research are suggested to be carried out.

戊型肝炎病毒（HEV）是一种单链 RNA 病毒，能够感染人类和动物。这项研究的目标是戊型肝炎病毒的 ORF2，因为它在形成病毒荚膜方面发挥着重要作用。针对戊型肝炎病毒 ORF2 进行了分子对接分析，在最初选定的 25 种化学物质中，有 8 种表现出较好的结合亲和力，尤其是与槲皮素和松萝素的结合能量最高。随后，进行了 ADMET 理论分析，以确保这些候选疗法的药代动力学和安全性。这项研究的发现突出表明，这些化合物具有很强的抗 HEV 病毒的特性，并得到了硅学分析的支持，这表明迫切需要具有成本效益和时间效率的策略来发现潜在的抗 HEV 病毒候选疗法。建议进一步开展实验室实验以及临床前和临床研究。

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引用次数: 0

Rice husk ash based complex sodium di silicate – An alternative detergent builder for sodium tripolyphosphate and Zeolite 4A 以稻壳灰为基础的复合二硅酸钠--三聚磷酸钠和沸石 4A 的替代洗涤剂添加剂

IF 3.2 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society

Pub Date : 2024-10-23 DOI: 10.1016/j.jics.2024.101444

Nikhil L. Dhote , Snehal S. Balbudhe , Atul N. Vaidya

Detergent builder is an essential part of any detergent powder, as it softens the hard water which hinders the cleaning action of surfactants. Nowadays, sodium tripolyphosphate and Zeolite 4A are used as detergent builders extensively in detergent formulation. Though STPP has higher capacities to remove hardness from the water but has a detrimental impact on the environment like eutrophication and hence it has been banned for detergent application in various countries. Zeolite 4A is currently leading the detergent industry with moderate hardness removal, but it has certain disadvantages like high pH, insolubility, high solid residue in the wash water and needs additives for its activation in the detergent formulation. In this research paper, the better alternative detergent builder known as Complex sodium dislicate (CSDS) is produced using rice husk ash-based sodium silicate. Further CSDS is analyzed using SEM, XRD, and TGA-DSC to explain its physicochemical properties. The calcium exchange capacity evaluation is carried out and is found to be 420 mg eq. CaCO₃/gram of CSDS which is higher than STPP and Zeolite 4A. In this study, detergent formulations made with CSDS as a detergent builder were compared with those of STPP and Zeolite 4A to evaluate detergent performances according to the IS 4955:2020 standard.

增洁剂是任何洗涤粉的重要组成部分，因为它能软化阻碍表面活性剂清洁作用的硬水。如今，三聚磷酸钠和沸石 4A 被广泛用作洗涤剂配方中的洗涤剂添加剂。虽然 STPP 去除水中硬度的能力较强，但会对环境造成有害影响，如富营养化，因此各国已禁止将其用于洗涤剂。沸石 4A 目前在洗涤剂行业处于领先地位，具有适度的硬度去除能力，但它也有一些缺点，如 pH 值高、不溶解、洗涤水中固体残留量高，而且需要添加剂才能在洗涤剂配方中激活。在本研究论文中，使用以稻壳灰为基础的硅酸钠生产出了更好的替代洗涤剂添加剂，即复方二元酸钠（CSDS）。此外，还使用 SEM、XRD 和 TGA-DSC 对 CSDS 进行了分析，以解释其物理化学特性。对钙交换容量进行评估后发现，CSDS 的钙交换容量为 420 毫克当量 CaCO3/克。CaCO3/克，高于 STPP 和沸石 4A。在这项研究中，根据 IS 4955:2020 标准，将 CSDS 作为洗涤剂添加剂制成的洗涤剂配方与 STPP 和沸石 4A 进行了比较，以评估洗涤剂的性能。

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引用次数: 0

Cytotoxic activity properties of a benzimidazolium salt against lung, liver, and colon cancer cell lines 苯并咪唑盐对肺癌、肝癌和结肠癌细胞系的细胞毒活性特性

IF 3.2 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society

Pub Date : 2024-10-22 DOI: 10.1016/j.jics.2024.101445

Senem Akkoc

In this study, a known benzimidazolium salt was synthesized in two steps starting from N-phenyl-o-phenylenediamine. This compound was tested in vitro for 72 h against different cancer cell lines (A549 - lung cancer, HepG2 - liver cancer, DLD-1 - colon cancer) and to compare the activity of this compound with cisplatin, a widely used chemotherapeutic agent. The evaluation of compound 4 as a potential anticancer agent against different cancer types was achieved by examining the cytotoxic effects of this compound through IC50 values using the MTT method. It was found that compound 4 showed different activity depending on the cell type and had a high cytotoxic effect (IC₅₀: 15.68 μM), especially against lung cancer cell line for 72 h incubation time.

本研究以 N-苯基邻苯二胺为起点，分两步合成了一种已知的苯并咪唑盐。该化合物针对不同的癌细胞株（A549-肺癌、HepG2-肝癌、DLD-1-结肠癌）进行了 72 小时的体外测试，并将其活性与广泛使用的化疗药物顺铂进行了比较。通过使用 MTT 法检测该化合物的细胞毒性作用 IC50 值，评估了化合物 4 作为潜在抗癌剂对不同癌症类型的作用。结果发现，化合物 4 在不同的细胞类型中表现出不同的活性，尤其是在 72 小时的培养时间内对肺癌细胞株具有较高的细胞毒性作用（IC50：15.68 μM）。

引用次数: 0

Synthesis, characterization, and novel reactivity of nano CeO2 catalyst for solvent-free Knoevenagel condensation 用于无溶剂克诺文纳格尔缩合的纳米 CeO2 催化剂的合成、表征和新型反应活性

IF 3.2 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society

Pub Date : 2024-10-20 DOI: 10.1016/j.jics.2024.101442

Balaga Viswanadham , Sreekantha B. Jonnalagadda

We synthesized the nano CeO₂ using the sol-gel method and characterized the material using different techniques, including XRD, FT-IR, BET surface area, SEM, and TEM analysis. We tested the catalytic functionalities of nano CeO₂ catalyst for Knoevengel condensation of different substituted benzaldehydes with malononitrile, which offered exceptional 95 % conversion and yield. The results support that nano CeO₂ material significantly boosted the yield of the desired product compared to the bulk material. The low-angle XRD profile showed that the regenerated nanomaterial fully retained the porous nature and cubic structure of ceria. FT-IR results reveal that the characteristic vibrational IR band is at 720 cm⁻¹, which is attributed to Ce–O–Ce stretching. The BET surface area result indicates that nano-ceria possesses a higher surface area than bulk CeO₂ material. The SEM analysis illustrates cube-like morphology and TEM data show the nanorod-like appearance of ceria. The nanocatalyst exhibited stable and sustainable activity during regeneration up to 5 cycles.

我们采用溶胶-凝胶法合成了纳米 CeO2，并利用 XRD、FT-IR、BET 表面积、SEM 和 TEM 分析等不同技术对材料进行了表征。我们测试了纳米 CeO2 催化剂在不同取代苯甲醛与丙二腈的 Knoevengel 缩合反应中的催化功能，其转化率和产率高达 95%。结果表明，与块状材料相比，纳米 CeO2 材料显著提高了所需产物的产率。低角度 XRD 图谱显示，再生纳米材料完全保留了铈的多孔性和立方结构。傅立叶变换红外光谱（FT-IR）结果显示，特征振动红外波段位于 720 cm-1，属于 Ce-O-Ce 伸展。BET 比表面积结果表明，纳米铈比块状 CeO2 材料具有更高的比表面积。扫描电子显微镜（SEM）分析表明了铈的立方体形态，而 TEM 数据则显示了铈的纳米棒状外观。该纳米催化剂在再生过程中表现出稳定和持续的活性，可循环使用 5 次。

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引用次数: 0

Microbial depolymerization of Kraft lignin for production of Vanillic acid by indigenous ligninolytic strains 利用本地木质素分解菌株对牛皮纸木质素进行微生物解聚以生产香草酸

IF 3.2 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society

Pub Date : 2024-10-18 DOI: 10.1016/j.jics.2024.101438

Swati Chandrawanshi, Anandkumar Jayapal

Lignin is a potential renewable source for the production of many value-added bio-products through bacterial depolymerization. In this study, Kraft lignin (KL) was depolymerized by indigenous potential ligninolytic strains to obtain the optimum amount of Vanillic acid. Initially, fifteen bacterial strains were isolated from decaying wood mixed soil to assess their lignin degradation efficiency. Five potential lignin-degrading microbes (RW-B₂, RW-B₄, RW-B₉, RW-B₁₁ and RW-B₁₅) were identified by nutrient enrichment technique. RW-B₁₅ was observed as a dominant strain sharing a 99 % resemblance to Bacillus megaterium sp. Optimum temperature and bacterial inoculum concentration were noted as 35 °C and 1 %, respectively. Mixed microbial culture of five potential ligninolytic strains showed better KL degradation than pure culture due to different metabolic capacities, enzymatic mechanisms and synergetic impact among the association members. The KL degradation study was conducted with different KL concentrations (500–2000 mg/l) at optimum temperature using 1 % inoculums. The production of Vanillic acid increased from 60.1 to 199.9 mg/l with increasing concentration of KL from 500 to 2000 mg/l. The maximum production of Vanillic acid was obtained on 3rd day of degradation and it decreased thereafter which is probably due to an increase in microbial toxicity and enzymatic activity. However, the COD level continuously decreased for all KL concentrations with degradation time till the last day. The pH of the KL solution slightly decreased on 3rd day due to the acidic nature of Vanillic acid. GC-MS analysis confirmed the presence of Vanillic acid and showed the presence of other monomeric compounds formed after KL degradation.

木质素是一种潜在的可再生资源，可通过细菌解聚作用生产多种高附加值的生物产品。在这项研究中，本地潜在的木质素分解菌株对牛皮纸木质素（KL）进行了解聚，以获得最佳量的香草酸。最初，从腐木混合土壤中分离出 15 种细菌菌株，以评估它们的木质素降解效率。通过营养富集技术，确定了五种潜在的木质素降解微生物（RW-B2、RW-B4、RW-B9、RW-B11 和 RW-B15）。最佳温度和细菌接种浓度分别为 35 °C 和 1%。五种潜在的木质素分解菌株的混合微生物培养显示出比纯培养物更好的 KL 降解效果，这是因为联合体成员之间的代谢能力、酶作用机制和协同影响各不相同。在最佳温度下，使用 1 % 的接种物对不同浓度（500-2000 mg/l）的 KL 进行了降解研究。随着 KL 浓度从 500 毫克/升到 2000 毫克/升的增加，香草酸的产量从 60.1 毫克/升增加到 199.9 毫克/升。香草酸的产量在降解的第三天达到最大值，之后有所下降，这可能是由于微生物毒性和酶活性的增加。然而，随着降解时间的延长，所有 KL 浓度的 COD 水平都持续下降，直到最后一天。由于香草酸呈酸性，KL 溶液的 pH 值在第三天略有下降。气相色谱-质谱分析证实了香草酸的存在，并显示了 KL 降解后形成的其他单体化合物的存在。

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引用次数: 0

A sustainable strategy to improve photocatalytic degradation properties of CuO and CuO-rGO nanocomposite using Eucalyptus leaf extract 利用桉树叶提取物改善 CuO 和 CuO-rGO 纳米复合材料光催化降解特性的可持续战略

IF 3.2 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society

Pub Date : 2024-10-18 DOI: 10.1016/j.jics.2024.101423

S. Satheeskumar , S. Surendhiran , C. Shanthi , A. Panneerselvam , S. Senthilkumar , B.V. Bhuvaneswari

In this study, Copper oxide (CuO) nanoparticles were synthesized using a sustainable approach. The process comprised Eucalyptus leaf extract as both a biological capping agent and a reducing agent. The synthesis process used a one-pot hydrothermal technique to efficiently combine CuO nanoparticles with reduced graphene oxide (rGO). Analytical methods were utilized to investigate the prepared nanocomposite's structural, crystalline, morphological, functional, optical, and thermal characteristics. The prepared sample was analyzed using X-ray diffraction, which revealed that CuO nanoparticles have a monoclinic crystal structure, and no impurity peaks were observed. Field emission scanning microscopes displayed the uniform dispersion of spherical CuO nanoparticles with layered and non-agglomerated, resembling a sponge-like structure of rGO. The microstructural analysis also confirmed the dispersion of copper inside reduced graphene oxide (rGO) sheets. The optical properties, including light absorption and bandgap width, were investigated using UV–visible spectroscopy using bandgap energies of 2.5 and 2.8 eV. In addition, the nanocomposite's ability to degrade cationic Rhodamine 6G and anionic Rose Bengal dyes by photocatalysis was evaluated. The degradation of RB and Rh6G dyes was characterized by nanocatalysis using UV–visible spectroscopy and a pseudo-first-order kinetics model. The pseudo-first-order degradation kinetic rate of Rhodamine 6G was determined to be 2.55 x 10⁻² min⁻¹, indicating that the nanocomposite effectively initiates this dye's degradation. The results showed that dye degradation was effective even at reduced catalyst concentrations.

本研究采用可持续方法合成了纳米氧化铜（CuO）颗粒。该工艺由桉树叶提取物作为生物封端剂和还原剂。合成过程采用一锅水热技术，有效地将氧化铜纳米粒子与还原型氧化石墨烯（rGO）结合在一起。利用分析方法研究了所制备纳米复合材料的结构、结晶、形态、功能、光学和热学特性。利用 X 射线衍射分析了制备的样品，结果表明 CuO 纳米粒子具有单斜晶体结构，且未观察到杂质峰。场发射扫描显微镜显示，球形 CuO 纳米粒子均匀分散，具有分层和无团聚的特点，类似于 rGO 的海绵状结构。微观结构分析也证实了铜在还原氧化石墨烯（rGO）片中的分散。利用带隙能量为 2.5 和 2.8 eV 的紫外可见光谱分析了其光学特性，包括光吸收和带隙宽度。此外，还评估了纳米复合材料通过光催化降解阳离子罗丹明 6G 和阴离子玫瑰红染料的能力。利用紫外可见光谱和伪一阶动力学模型对纳米催化降解 RB 和 Rh6G 染料的过程进行了表征。经测定，罗丹明 6G 的伪一阶降解动力学速率为 2.55 x 10-2 min-1，表明纳米复合材料能有效地启动该染料的降解。结果表明，即使在催化剂浓度降低的情况下，染料降解也是有效的。

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引用次数: 0