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

Efficient ammonia sequestration by Al-based MOF composites: Synergistic regulation of supports and loading strategies and investigation of the adsorption mechanism al基MOF复合材料高效固氨：载体和负载策略的协同调节及吸附机理研究

IF 3.4 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society

Pub Date : 2026-02-01 DOI: 10.1016/j.jics.2026.102422

Lei Zhang , Liu Zhang , Ya Chen , Lei Zhang , Chenxi Tan , Ruikang Song , Shizhe Gao

This study employed 3,5-pyrazoledicarboxylic acid (PZDC) as a ligand to synthesize aluminum-based metal-organic frameworks (Al-PZDC) via an in-situ hydrothermal method. Al-PZDC composites were constructed using two loading methods—preloading and postloading—with 13X molecular sieves, activated carbon, and γ-Al₂O₃ as carriers, respectively. The physicochemical properties of the materials were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). The NH₃ adsorption mechanism was investigated by combining adsorption kinetic models, pre- and post-adsorption spectral analysis, and in situ differential Raman infrared spectroscopy (Insitu DRIFTS). The results indicate that Al-PZDC was successfully loaded onto each carrier; Composites prepared by the pre-loading method exhibited superior adsorption performance compared to those from the post-loading method. The composite (13X molecular sieve @Al-PZDC-0.4) prepared using 13X molecular sieve as the carrier and the pre-loading method demonstrated the most outstanding NH₃ adsorption performance, achieving a saturation adsorption capacity of 100.57 mg g⁻¹ at 25 °C and 1 % NH₃ concentration. Kinetics analysis indicates that NH₃ adsorption is primarily chemical adsorption supplemented by physical adsorption. The adsorption mechanism involves physical adsorption, pore filling, hydrogen bonding interactions, and the synergistic effects of Lewis acid (l-acid) and Brønsted acid (B-acid) sites.

本研究以3,5-吡唑二羧酸（PZDC）为配体，采用原位水热法制备铝基金属有机骨架（Al-PZDC）。分别以13X分子筛、活性炭和γ-Al2O3为载体，采用预加载和后加载两种方式构建Al-PZDC复合材料。采用x射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、布鲁诺尔-埃米特-泰勒（BET）、扫描电镜（SEM）和热重分析（TGA）对材料的物理化学性质进行了表征。通过吸附动力学模型、吸附前、吸附后光谱分析和原位差分拉曼红外光谱（Insitu DRIFTS）研究了NH3的吸附机理。结果表明：Al-PZDC均成功加载到载体上；预加载法制备的复合材料吸附性能优于后加载法制备的复合材料。以13X分子筛为载体，采用预载法制备的复合材料（13X分子筛@Al-PZDC-0.4）对NH3的吸附性能最为优异，在25℃、NH3浓度为1%时，饱和吸附量为100.57 mg g−1。动力学分析表明，NH3吸附以化学吸附为主，物理吸附为辅。吸附机理包括物理吸附、孔隙填充、氢键相互作用以及Lewis酸（l-acid）和Brønsted酸（B-acid）位点的协同作用。

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引用次数: 0

Novel casein-infused nickel hydroxide bio-nanocomposite: Synthesis and analysis of electrochemical and antimicrobial behaviour 新型注入酪蛋白的氢氧化镍生物纳米复合材料：电化学和抗菌性能的合成与分析

IF 3.4 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society

Pub Date : 2026-02-01 DOI: 10.1016/j.jics.2026.102437

Ebineser Jayaraj Selvaraj, Palaniappan Lakshmanan

In this materialistic world, the multifunctional materials and their applications are widely appreciated. A novel multifunctional nanoparticle, the casein-infused nickel hydroxide, is synthesized through co-precipitation method and analysed for its electrochemical and antibacterial activities in this work. Analysis includes X-ray diffraction (XRD),Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscope with Energy Dispersive X-ray analysis (FESEM with EDAX), High-Resolution Transition Electron Microscope (HRTEM), X-ray Photoelectron spectroscopy (XPS). The electrochemical performance of the prepared material was evaluated using Cyclic voltammetry (CV), Galvanostatic charge and discharge (GCD) and Electrochemical impedance spectroscopy (EIS) studies. Specific capacitance of casein-infused nickel hydroxide nanocomposite shows increased specific capacitance, increased energy and power density compared to that of pure nickel hydroxide nanoparticles that are attributed to the surface and structural modification. Further, the synergetic effect found in the casein-infused nickel hydroxide bio-nanocomposite shows an increased antimicrobial activity than that of the pure nickel hydroxide in vitro antimicrobial susceptibility assay.

在这个物质至上的世界里，多功能材料及其应用受到了广泛的重视。采用共沉淀法合成了一种新型多功能纳米颗粒——酪蛋白注入的氢氧化镍，并对其电化学和抗菌活性进行了分析。分析方法包括x射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、场发射扫描电子显微镜与能量色散x射线分析（FESEM与EDAX）、高分辨率过渡电子显微镜（HRTEM）、x射线光电子能谱（XPS）。采用循环伏安法（CV）、恒流充放电法（GCD）和电化学阻抗谱法（EIS）对制备材料的电化学性能进行了评价。与纯氢氧化镍纳米复合材料相比，酪蛋白注入的氢氧化镍纳米复合材料的比电容增加，能量和功率密度增加，这是由于表面和结构的修饰。此外，在体外抗菌敏感性试验中，酪蛋白注入的氢氧化镍生物纳米复合材料的协同效应显示出比纯氢氧化镍更高的抗菌活性。

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引用次数: 0

Nickel MOF enabled cadmium adsorption: A response surface optimization study 镍MOF使镉吸附：响应面优化研究

IF 3.4 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society

Pub Date : 2026-02-01 DOI: 10.1016/j.jics.2026.102442

Aman Kumar , J. Prabhakaran , Cheshta , Pardeep Kumar Jangra , Harveer Singh Pali , M.A. Shah

Nickel-based metal-organic frameworks (Ni-MOFs) are synthesized and employed as efficient adsorbents for the removal of cadmium (Cd²⁺) ions from aqueous solutions. The adsorption process is optimized using response surface methodology (RSM) with a central composite design (CCD) to evaluate the influence of three key factors: pH, contact time, and adsorbent concentration. Analysis of variance (ANOVA) confirms the adequacy of the quadratic model, with high correlation coefficients (R² = 0.9969 and

R_{a d j}^{2}

= 0.9941) and low coefficient of variation, indicating strong model reliability. Among the studied parameters, solution pH emerges as the most significant factor influencing Cd²⁺ removal. The optimization results reveal that a pH of 5.0, a contact time of 15 min, and an adsorbent concentration of 0.03 g yield an optimum cadmium removal efficiency of 79.9 %. Confirmatory experiments validate the predicted model outcomes, demonstrating close agreement between experimental and theoretical values. This study establishes Ni-MOFs as a promising, efficient, and reusable adsorbent for cadmium remediation in wastewater treatment applications.

合成了镍基金属有机骨架（Ni-MOFs），并将其作为吸附水中镉（Cd2+）离子的高效吸附剂。采用响应面法（RSM）和中心复合设计（CCD）对吸附过程进行优化，评价pH、接触时间和吸附剂浓度三个关键因素对吸附过程的影响。方差分析（ANOVA）证实了二次模型的充分性，相关系数高（R2 = 0.9969, Radj2 = 0.9941），变异系数低，表明模型可靠性强。在研究的参数中，溶液pH是影响Cd2+去除率最显著的因素。优化结果表明，在pH为5.0、接触时间为15 min、吸附剂浓度为0.03 g的条件下，吸附镉的最佳去除率为79.9%。验证性实验验证了预测模型的结果，证明了实验值和理论值之间的密切一致。本研究确定了ni - mof作为一种有前途的、高效的、可重复使用的吸附剂在废水处理中的镉修复应用。

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引用次数: 0

Exploring experimental and theoretical insights on green synthesized TiO2 nanoparticles using Cissus Quadrangularisis extract 探索四角仙提取物绿色合成TiO2纳米颗粒的实验和理论见解

IF 3.4 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society

Pub Date : 2026-02-01 DOI: 10.1016/j.jics.2026.102464

P. Usha , J. Ramkumar , D. Priya , C. Rajeevgandhi , N. Hajarabeevi

This study reports the eco-friendly synthesis of titanium dioxide nanoparticles (TiO₂ NPs) using Cissus Quadrangularis stem extract and evaluates their biological, photocatalytic, and electronic properties. The synthesized TiO₂ NPs were characterized by FT–IR, XRD, UV–Vis, HR–SEM, and EDX, confirming their composition, crystallinity, and uniform morphology. The nanoparticles exhibited strong antibacterial activity against Escherichia coli (36 mm) and Bacillus subtilis (22 mm) with MIC values of 75 μg and 100 μg, respectively. Antioxidant assays (DPPH, ABTS, PM) showed over 50% activity relative to ascorbic acid. Photocatalytic studies demonstrated ∼50% degradation of methylene blue within 12 h, indicating potential for environmental remediation. The DFT method with CAM-B3LYP/6–311++G(d,p) basis set was analyses of Quercetin and TiO₂ NPs revealed electronic distributions, frontier molecular orbitals, MEP, ELF, LOL, RDG, and DOS, providing insights into reactivity and non-covalent interactions. First hyperpolarizability (β₀) indicated significant nonlinear optical potential, while molecular docking confirmed favorable protein interactions. These findings demonstrate that green-synthesized TiO₂ NPs possess multifunctional properties suitable for antibacterial, antioxidant, photocatalytic, and NLO applications, offering a sustainable approach for biomedical and environmental technologies.

本研究报道了以四角蛇茎提取物为原料环保合成二氧化钛纳米粒子（TiO2 NPs），并对其生物、光催化和电子性能进行了评价。采用FT-IR、XRD、UV-Vis、HR-SEM和EDX对合成的TiO2 NPs进行了表征，证实了其组成、结晶度和均匀的形貌。纳米颗粒对大肠杆菌（36 mm）和枯草芽孢杆菌（22 mm）具有较强的抑菌活性，MIC值分别为75 μg和100 μg。抗氧化实验（DPPH， ABTS， PM）显示抗坏血酸活性超过50%。光催化研究表明，亚甲基蓝在12小时内降解约50%，表明了环境修复的潜力。基于CAM-B3LYP/ 6-311 ++G（d,p）基集的DFT方法分析了槲皮素和TiO2 NPs的电子分布、前沿分子轨道、MEP、ELF、LOL、RDG和DOS，揭示了反应性和非共价相互作用。首先，超极化率（β0）表明了显著的非线性光学势，而分子对接证实了有利的蛋白质相互作用。这些发现表明，绿色合成的TiO2 NPs具有多种功能，适用于抗菌、抗氧化、光催化和NLO应用，为生物医学和环境技术提供了可持续的途径。

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引用次数: 0

Synthesis and characterization of sewage sludge-derived biochar for treating Cr(VI)-contaminated wastewater 处理Cr（VI）污染废水的污泥生物炭的合成与表征

IF 3.4 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society

Pub Date : 2026-02-01 DOI: 10.1016/j.jics.2026.102443

Mohamed Khitous , Mohamed Trari

This study investigates the use of biochar derived from municipal sewage sludge, pyrolyzed at 450 °C in an O₂-free atmosphere, as an adsorbent for the removal of Cr(VI) from wastewater. The biochar was physicochemically characterized by FTIR, SEM, XRD, XPS, BET analysis, and pH at the zero point charge (pH_zpc). Batch adsorption experiments were conducted at room temperature to evaluate its performance for Cr(VI) removal. The effects of initial Cr(VI) concentration, adsorbent dose, agitation time, and pH on the adsorption were explored. The adsorption capacity increased from 23.19 to 81.75 mg/g as the initial Cr(VI) concentration rose from 30 to 100 mg/L. Optimal adsorption occurred at pH⁓5, with an agitation time of 60 min and a sorbent dose of 5 g/L. Linear regression analysis indicated that the Freundlich model provided a better fit than the Langmuir model for describing Cr(VI) adsorption onto the biochar. The adsorption kinetics followed a pseudo-second-order model, suggesting that the process is governed by chemisorption. In addition, the biochar showed excellent recyclability and reusability over four regeneration-adsorption cycles, demonstrating its potential for suitable long-term applications. This study provides an efficient, low-cost and eco-friendly adsorbent for treating Cr(VI)-containing wastewater, while also offering a sustainable solution for sewage sludge management.

本研究研究了从城市污水污泥中提取的生物炭，在无o2的气氛中在450°C下热解，作为吸附剂去除废水中的Cr（VI）。采用FTIR、SEM、XRD、XPS、BET分析和pH零点电荷（pHzpc）对生物炭进行了物理化学表征。在室温下进行了批量吸附实验，以评价其去除Cr（VI）的性能。考察了初始Cr（VI）浓度、吸附剂剂量、搅拌时间和pH对吸附性能的影响。随着Cr（VI）初始浓度从30 mg/L增加到100 mg/L，吸附量从23.19 mg/g增加到81.75 mg/g。最佳吸附条件为pH⁓5，搅拌时间为60 min，吸附剂用量为5 g/L。线性回归分析表明，Freundlich模型比Langmuir模型更适合描述Cr（VI）在生物炭上的吸附。吸附动力学遵循准二阶模型，表明该过程受化学吸附控制。此外，生物炭在四个再生-吸附循环中表现出良好的可回收性和可重复使用性，表明其具有长期应用的潜力。本研究为处理含铬废水提供了一种高效、低成本、环保的吸附剂，同时也为污水污泥管理提供了一种可持续的解决方案。

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引用次数: 0

Corrosion resistance and mechanical properties of Ni/Ni–Co–La coating on T2-Cu: Electrochemical mechanism and kinetics study T2-Cu表面Ni/Ni - co - la涂层的耐蚀性和力学性能：电化学机理和动力学研究

IF 3.4 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society

Pub Date : 2026-01-31 DOI: 10.1016/j.jics.2026.102458

Hongxuan Xing , Zhongning Shi , Shuai Yang , Renyun Zhang

Improving the corrosion resistance and surface mechanical properties of T2-Cu is essential for its application in aggressive chemical and marine environments. In this study, a Ni/Ni–Co–La composite coating was prepared on T2-Cu by ultrasonic-assisted double-pulse electrodeposition to elucidate the electrochemical behavior of La³⁺ in an aqueous system and its influence on coating performance. The deposition mechanism and kinetics were investigated using cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy. The results indicate that La³⁺ is co-deposited with Ni²⁺ and Co²⁺ through an induced, irreversible, diffusion-controlled process, forming a single-phase face-centered cubic Ni-based solid solution. The introduction of La significantly refines the grain structure and enhances coating compactness. Electrochemical corrosion tests in 3.5 wt% NaCl solution show that the corrosion current density decreases from 4.387 to 0.287 μA cm⁻² (≈93.5% reduction), while the corrosion potential shifts positively by 88 mV, and the corrosion rate is reduced by nearly one orders of magnitude. Meanwhile, the microhardness increases from 177.2 to 563.3 HV_0.2 (≈218%), and the average friction coefficient decreases by about 67%. These results demonstrate that rare-earth-modified alloy coatings prepared by double-pulse electrodeposition provide an effective strategy for protecting copper alloys.

提高T2-Cu的耐腐蚀性和表面力学性能是其在腐蚀性化学和海洋环境中应用的必要条件。本研究采用超声辅助双脉冲电沉积的方法在T2-Cu表面制备了Ni/Ni - co - la复合镀层，以研究La3+在水体系中的电化学行为及其对镀层性能的影响。采用循环伏安法、计时安培法和电化学阻抗法研究了沉积机理和动力学。结果表明：La3+与Ni2+和Co2+通过诱导、不可逆、扩散控制的过程共沉积，形成单相面心立方ni基固溶体；镧的引入使镀层的晶粒结构明显细化，致密性增强。在3.5 wt% NaCl溶液中进行电化学腐蚀试验，腐蚀电流密度从4.387减小到0.287 μA cm−2(≈93.5%)，腐蚀电位正位移88 mV，腐蚀速率降低了近1个数量级。同时，显微硬度从177.2提高到563.3 HV0.2(≈218%)，平均摩擦系数降低约67%。结果表明，采用双脉冲电沉积法制备稀土改性合金涂层是一种有效的铜合金保护策略。

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引用次数: 0

Characterization, geometrical structural, optical properties and electrical conductivity, and effect of type of derivatives of azo Schiff base quinoline on the optical energies gap and theoretical parameters 偶氮席夫碱喹啉的表征、几何结构、光学性质和电导率，以及衍生物类型对其能隙和理论参数的影响

IF 3.4 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society

Pub Date : 2026-01-31 DOI: 10.1016/j.jics.2026.102459

Sh.M. Morgan , A.Z. El-Sonbati , N.A. El-Ghamaz , S.G. Nozha , M.A. Diab , M.A. El-Mogazy

This study investigates the optical properties, electrical conductivity and dielectric behavior of a series of azo Schiff base quinoline ligands 4-{[5-(4- derivatives-phenylazo)-8-hydroxy-quinolin-7-ylmethylene]-amino}-1,5-dimethyl-2-phenyl-1,2-dihydro-pyrazol -3-one (HL₁ – HL₅). Optimized molecular geometry and quantum chemical calculations indicate that the HL₄ ligand is more stable than the other ligands. The HOMO–LUMO energy gap of ligands is in the range 2.645–3.552 eV. The thermal activation energies for AC conductivity for ligands decrease with increasing frequency, and the AC conductivity is influenced by the variation of the substituent groups in the ligand structures. The AC electrical conductivity mechanism in HL₁–HL₅ is found to follow the correlated barrier hopping model. The type of electronic transition found to be indirect allowed for all ligands. The optical energy gaps (E_g) are calculated to be 0.613, 1.19, 1.658 and 1.753 eV, for the thermally evaporated thin films of the HL_2-5 ligands, respectively. The width of the band tail (E_u) values is found in range from 0.713 to 1.000 eV for the ligands. All the ligands show good emission properties; especially HL₁ ligand demonstrates the highest values of emission intensity.

研究了一系列偶氮希夫碱喹啉配体4-{[5-（4-衍生物-苯基偶氮）-8-羟基喹啉-7-基亚甲基]-氨基}-1,5-二甲基-2-苯基-1,2-二氢吡唑-3- 1 （HL1 - HL5）的光学性质、电导率和介电行为。优化的分子几何和量子化学计算表明，HL4配体比其他配体更稳定。配体的HOMO-LUMO能隙在2.645 ~ 3.552 eV之间。配体的交流电导率的热活化能随频率的增加而降低，并且交流电导率受配体结构中取代基变化的影响。发现HL1-HL5的交流电导率机制遵循相关的垒跳模型。所有配体都允许的间接电子跃迁类型。计算出HL2-5配体热蒸发薄膜的光学能隙（Eg）分别为0.613、1.19、1.658和1.753 eV。配体的带尾宽度（Eu）值在0.713 ~ 1.000 eV之间。所有配体都表现出良好的发射性能；特别是HL1配体的发射强度最高。

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引用次数: 0

Electrodeposition of Ni-Zn-S films from zinc plant filter cakes: A waste-derived electrocatalyst for alkaline hydrogen evolution 从锌厂滤饼中电沉积Ni-Zn-S薄膜：一种用于碱性析氢的废源电催化剂

IF 3.4 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society

Pub Date : 2026-01-30 DOI: 10.1016/j.jics.2026.102447

Davood Moradkhani , Fatemeh Asjadi , Ghasem Barati Darband , Hamed Mousavi , Sara Panahi , Zeinab Hashemlou

In this study, Ni/Zn/S containing films were successfully electrodeposited on nickel foam using leachates derived from cold purification filter cakes of a zinc production plant. This method introduces the effective utilization of industrial waste to produce efficient electrocatalysts for the hydrogen evolution reaction (HER) in alkaline media. The structural, morphological, and compositional properties of the films were characterized by SEM, XRD, EDS, and FTIR analyses.

Among the samples prepared under different deposition conditions, the catalyst obtained via optimized pulsed chronoamperometric deposition exhibited the best HER performance, achieving overpotentials of 70, 110, 200, and 330 mV at 10, 20, 50, and 100 mA cm⁻², respectively. The Tafel slope of 95 mV.dec⁻¹ indicates favorable reaction kinetics dominated by the Tafel step. Moreover, the optimized sample displayed the highest double layer capacitance (C_dl = 7.09 μF cm⁻²) and electrochemically active surface area (ECSA = 354 cm²) corresponding to a roughness factor of approximately 354.

The enhanced activity is attributed to its rough, thin morphology and Ni–S-rich surface composition, which increase both the density of active sites and intrinsic catalytic activity. This work demonstrates that complex industrial leachates can be effectively recycled into high-performance and low-cost HER electrocatalysts through optimization of the electrodeposition process.

利用某锌厂冷净化滤饼的渗滤液，成功地在泡沫镍上电沉积了含Ni/Zn/S薄膜。本文介绍了利用工业废渣在碱性介质中制备高效析氢反应电催化剂的方法。采用SEM、XRD、EDS和FTIR等分析手段对膜的结构、形态和成分进行了表征。在不同沉积条件下制备的样品中，通过优化脉冲计时安培沉积得到的催化剂表现出最好的HER性能，在10、20、50和100 mA cm−2下分别实现了70、110、200和330 mV的过电位。Tafel斜率为95 mV.dec−1，表明反应动力学以Tafel步骤为主。此外，优化后的样品显示出最高的双层电容（Cdl = 7.09 μF cm−2）和电化学活性表面积（ECSA = 354 cm2），对应的粗糙度因子约为354。活性的增强是由于其粗糙、薄的形貌和富含ni - s的表面组成，从而增加了活性位点的密度和内在催化活性。该研究表明，通过优化电沉积工艺，复杂的工业渗滤液可以有效地回收成高性能和低成本的HER电催化剂。

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引用次数: 0

Design of advanced AC/MnO2 nanocomposites for efficient Rhodamine B dye removal from aqueous media 高效去除罗丹明B染料的AC/MnO2纳米复合材料的设计

IF 3.4 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society

Pub Date : 2026-01-30 DOI: 10.1016/j.jics.2026.102438

Bhanupriya Mordhiya, Rekha Sharma, Parmeshwar Lal Meena, Pooja Meena, Ashish Dev Kanwadia

The present study reports the development of a novel AC/MnO₂ nanocomposite synthesized from the dead bark of Indian jujube for the efficient removal of Rhodamine B (RhB) dye from aqueous media. Activated carbon (AC) was produced via chemical activation and subsequently modified through a low-temperature reductive deposition method to form a uniform MnO₂ coating. The structural, morphological, and surface properties of the nanocomposite were extensively characterized using FTIR, XRD, FESEM, HRTEM, EDS, and zeta potential analysis. The XRD pattern confirmed the formation of α-MnO₂ on the AC surface, while FTIR revealed abundant oxygen-containing functional groups that facilitate dye interaction. FESEM/HRTEM imaging showed a highly porous architecture suitable for adsorption, and the nanocomposite exhibited strong surface stability with a zeta potential of −43.10 mV.

Batch adsorption studies demonstrated that RhB removal was strongly influenced by pH, contact time, adsorbent dose, initial dye concentration, and temperature. Optimal performance was achieved at pH 2, with a dose of 40 mg L⁻¹ and a contact time of 50 min, resulting in a maximum removal efficiency of 98.40 %. Kinetic data fitted best to the pseudo-second-order model, indicating chemisorption-dominated interaction, while equilibrium data followed the Langmuir isotherm, suggesting monolayer adsorption with a maximum adsorption capacity of 135.13 mg g⁻¹. Thermodynamic analysis confirmed the spontaneity and endothermic nature of the adsorption process. The nanocomposite retained ∼90 % adsorption efficiency after four reuse cycles, demonstrating excellent structural stability and reusability.

Overall, the study establishes AC/MnO₂ synthesized from Indian jujube bark as a cost-effective, sustainable, and high-performance adsorbent for dye-contaminated wastewater remediation.

本文报道了一种以红枣死皮为原料合成的新型AC/MnO2纳米复合材料，用于高效去除水中介质中的罗丹明B （RhB）染料。活性炭（AC）通过化学活化制备，然后通过低温还原沉积法修饰，形成均匀的二氧化锰涂层。利用FTIR， XRD， FESEM， HRTEM， EDS和zeta电位分析对纳米复合材料的结构，形态和表面性能进行了广泛的表征。XRD谱图证实了AC表面有α-MnO2的形成，FTIR显示了丰富的含氧官能团，有利于染料的相互作用。FESEM/HRTEM成像显示，纳米复合材料具有适合吸附的高孔隙结构，具有较强的表面稳定性，zeta电位为- 43.10 mV。批量吸附研究表明，RhB的去除受pH、接触时间、吸附剂剂量、初始染料浓度和温度的强烈影响。在pH为2、剂量为40 mg L−1、接触时间为50 min的条件下，去除率最高可达98.40%。动力学数据最符合拟二阶模型，表明化学吸附为主，而平衡数据符合Langmuir等温线，表明单层吸附，最大吸附量为135.13 mg g−1。热力学分析证实了吸附过程的自发性和吸热性。该纳米复合材料在4次重复使用循环后仍保持90%的吸附效率，表现出优异的结构稳定性和可重复使用性。总体而言，本研究确定了红枣皮合成的AC/MnO2是一种经济、可持续、高性能的染料污染废水修复吸附剂。

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引用次数: 0

Stability and rheological investigations of three-phase O/W (oil-in-water) emulsion systems stabilized by cellulose micro/nano strands (CMNS) derived from sugarcane bagasse 甘蔗渣纤维素微纳米链（CMNS）稳定三相水包油乳液体系的稳定性和流变性研究

IF 3.4 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society

Pub Date : 2026-01-30 DOI: 10.1016/j.jics.2026.102462

Swati A. Sonawane , Kalyani Kulkarni , Ravindra D. Kulkarni , Ujwal D. Patil , Tushar D. Deshpande

In the present study, cellulose micro/nano strands (CMNS) extracted from sugarcane bagasse were utilized to prepare biocompatible three-phase O/W (oil-in-water) emulsion systems wherein water was a continuous phase and coconut oil was a dispersed phase. Prepared emulsions were characterized for their physicochemical and rheological properties. The destabilization, creaming behavior, droplet size distribution and rheological properties of prepared three-phase emulsion systems (Pickering emulsions) were correlated with variations in coconut oil and CMNS concentrations. Emulsion with 5 % CMNS concentration displayed superior properties with the least creaming tendency and higher stability due to optimal formulation resulting in a strong interconnected network of cellulose nano-strands. Oil concentration worked synergistically with the amount of CMNS to fix the emulsion stability. The interconnected network of CMNS could be responsible for a mechanical steric barrier around the oil droplets, preventing their coalescence and stabilizing the emulsion phase over time. The shear-thinning behaviors of emulsions were confirmed with a flow behavior index (n) value below 1. The consistency index showed that for a low shear rate, the collision between particles formed aggregate in the system consequently raising the emulsion viscosity. For higher shear rates, the former aggregates break eventually decreasing the viscosity. The developed biocompatible O/W emulsions will have widespread applications in cosmetics and personal care, food packaging, and pharmaceuticals.

在本研究中，利用从蔗渣中提取的纤维素微纳米链（CMNS）制备生物相容性三相O/W（水包油）乳液体系，其中水为连续相，椰子油为分散相。对制备的乳液进行了理化性质和流变性能表征。制备的皮克林乳液体系的失稳、成乳行为、液滴大小分布和流变性能与椰子油和CMNS浓度的变化有关。当CMNS浓度为5%时，乳液表现出优异的性能，乳化倾向最小，稳定性更高，这是由于优化的配方导致了纤维素纳米链的强互联网络。油的浓度与CMNS的用量协同作用，以固定乳状液的稳定性。相互连接的CMNS网络可能负责油滴周围的机械位阻屏障，阻止它们聚并并随着时间的推移稳定乳液相。乳状液的剪切减薄行为在流动性能指数(n)小于1时得到证实。稠度指数表明，在低剪切速率下，颗粒之间的碰撞在体系中形成聚集体，从而提高乳液粘度。在较高的剪切速率下，原有的团聚体最终破裂，降低了粘度。所研制的生物相容性乳剂将在化妆品、个人护理、食品包装和药品等领域得到广泛应用。

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