Results in Chemistry最新文献

{"title":"Iron metal–organic frameworks: Synthesis, characterization and application in phenol degradation in wastewater","authors":"Neeraj Kumar,&nbsp;Pranshi Verma,&nbsp;Archana Thakur","doi":"10.1016/j.rechem.2025.102144","DOIUrl":"10.1016/j.rechem.2025.102144","url":null,"abstract":"<div><div>This study reports the synthesis of two iron(III)-based metal–organic frameworks, Fe–MOFs (1) and (2), characterized through various techniques and their catalytic application in phenol degradation. The hydrothermal synthesis involved ferric nitrate nonahydrate, glutaric acid, and phloroglucinol for Fe-MOF (1) and ferric nitrate nonahydrate, glutaric acid and thiocynuric acid for Fe-MOF (2). Characterization of the Fe-MOFs was accomplished via infrared (IR) spectroscopy, field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray (EDX) analysis, powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA), which confirmed the synthesis. This study highlighted the significant catalytic activity of these Fe-MOFs (1) and (2) for phenol degradation studies in the presence of hydrogen peroxides. The optimal phenol degradation occurred at pH values ranging from 4–5, temperatures ranging from 30–40 °C, 0.01–0.02 g/L of the Fe-MOFs and 10 mmol of hydrogen peroxide. The results of the kinetics of phenol degradation indicated that degradation followed pseudo-first-order kinetics under different parameters. The thermodynamic kinetic studies also revealed a greater activation energy for Fe-MOF (1), whereas Fe-MOF (2) had a greater negative Gibbs energy, indicating greater spontaneity. This study highlights the application of iron-based metal–organic frameworks as catalysts for phenol degradation in wastewater.</div></div>","PeriodicalId":420,"journal":{"name":"Results in Chemistry","volume":"14 ","pages":"Article 102144"},"PeriodicalIF":2.5,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Peristaltic nanofluid flow analysis inside wavy channels for pharmacological applications","authors":"S.E. Ghasemi ,&nbsp;A.A. Ranjbar","doi":"10.1016/j.rechem.2025.102128","DOIUrl":"10.1016/j.rechem.2025.102128","url":null,"abstract":"<div><div>This study presents a two-phase model to simulate and analyze the peristaltic flow of nanofluids through a wavy-shaped channel, with significant applications in drug delivery systems in pharmacology and blood pumps. The research aims to investigate the temperature field and nanoparticle volume fraction, providing insights into heat and mass transfer behaviors in biomedical and industrial applications. The Adams-Bashforth numerical method has been employed to obtain the model results, ensuring accuracy and reliability. A comparison with two published works demonstrates high precision and consistency in the findings. Key results indicate a direct correlation between the Brownian motion parameter (N_b) and the temperature profile, where an increase in N_b from 3 to 7 leads to a 27 % rise in temperature at η = 0.3. Additionally, an increase in N_b enhances the nanofluid concentration, with a 15 % rise in nanoparticle fraction observed at η = 0.5. These findings contribute to optimizing nanofluid-based biomedical devices and improving thermal management in engineering applications.</div></div>","PeriodicalId":420,"journal":{"name":"Results in Chemistry","volume":"14 ","pages":"Article 102128"},"PeriodicalIF":2.5,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The AMPK-SIRT1 Axis: Redefining type 2 diabetes mellitus management","authors":"Mighty Kemelo ,&nbsp;Phillip Moseki","doi":"10.1016/j.rechem.2025.102139","DOIUrl":"10.1016/j.rechem.2025.102139","url":null,"abstract":"<div><div>Type 2 diabetes mellitus (T2DM) is a chronic metabolic disorder strongly associated with obesity and excessive fat accumulation in the liver and pancreas leading to insulin resistance and hyperglycemia. While lifestyle modifications are the first-line approach to managing T2DM, many patients require oral hypoglycemic medications to regulate and maintain blood glucose levels. Although the precise mechanisms of action for these drugs remain unclear, emerging evidence suggests that they may exert their effects through the AMP-activated protein kinase (AMPK) and/or Sirtuin 1 (SIRT1) pathways. Activation of the AMPK pathway promotes fatty acid oxidation, suppresses cholesterol biosynthesis, and enhances glucose uptake. Similarly, SIRT1, an NAD⁺-dependent deacetylase, regulates many proteins involved in glucose homeostasis and insulin signaling. This review explores the therapeutic potential of AMPK and SIRT1 in T2DM. It provides an in-depth analysis of AMPK's role in T2DM pathogenesis and highlights the benefits of AMPK modulation by polyphenols. Additionally, it delves into the mechanisms of oral hypoglycemic drugs, emphasizing the significance of AMPK activation. Furthermore, the review discusses the impact of calorie restriction and SIRT1 activation in T2DM, considering both non-pharmacological interventions and synthetic SIRT1 activation as viable therapeutic options.</div></div>","PeriodicalId":420,"journal":{"name":"Results in Chemistry","volume":"14 ","pages":"Article 102139"},"PeriodicalIF":2.5,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Walnut Shell as a bio-activated carbon for elimination of malachite green from its aqueous solution: Adsorption isotherms, kinetics and thermodynamic studies","authors":"Lekaa Hussein Abid ,&nbsp;Zainab Haider Mussa ,&nbsp;Issa Farhan Deyab ,&nbsp;Lubna Raad Al-Ameer ,&nbsp;Haider Falih Shamikh Al-Saedi ,&nbsp;Fouad Fadhil Al-Qaim ,&nbsp;Hesam Kamyab ,&nbsp;Saravanan Rajendran ,&nbsp;Ahmed Falah Imran ,&nbsp;Zaher Mundher Yaseen","doi":"10.1016/j.rechem.2025.102124","DOIUrl":"10.1016/j.rechem.2025.102124","url":null,"abstract":"<div><div>Large amounts of hazardous and synthetic dye are produced by the textile industry. Nevertheless, the literature still lacks an effective method for removing hazardous synthetic dye, specifically malachite green, from wastewater. To fill this gap, this study used a batch method to evaluate the adsorption of malachite green onto an adsorbent derived from walnut shells (ACWS). According to previous studies, zinc chloride is rarely used as a chemical agent for activating walnut shells. Moreover, very little carbon has been used to eliminate the dye. To identify the ideal conditions, this paper examined the effects of washing, carbonization temperature, contact duration, adsorbent dosage, and dye concentration on the adsorption capacity and removal percentage. The Freundlich and Langmuir models were used to analyze the experimental isotherm data. The equilibrium adsorption data fit the Langmuir equation more closely, as evidenced by a high correlation factor (R² = 0.9970). The data also showed an acceptable fit with the Freundlich model, with the “n” constant ranging from 2 to 10. The parameter values for the aforementioned models were as follows: Qm = 588.23 mg/g, KL = 0.0602 L/mg, KF = 201, and 1/<em>n</em> = 0.1838. The adsorption process of malachite green onto ACWS was further investigated using both first- and second-pseudo-order models. The kinetics of adsorption, with a determination coefficient (R²) of 0.9943, closely followed a pseudo-second-order kinetic model. The rate constants were found to be 0.0274 min⁻¹ for the pseudo-first-order and 0.0033 g/min·mg for the pseudo-second-order kinetics. The thermodynamic parameters were determined from the adsorption isotherms at various temperatures, yielding free energy ΔG° values ranging from −5.5241 to −9.27 kJ/mol, a positive enthalpy change ΔH° of 31.0538 kJ/mol, and an entropy change ΔS° of 124.84 J/mol·K. The positive ΔH° and negative ΔG° indicate that the overall adsorption of MG is endothermic and spontaneous.</div></div>","PeriodicalId":420,"journal":{"name":"Results in Chemistry","volume":"14 ","pages":"Article 102124"},"PeriodicalIF":2.5,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Potential hydrogen storage complexes: Short-time microwave-assisted synthesis, characterization, thermodynamic, and international relations","authors":"Mohammed N. Jassim ,&nbsp;Nora A. Salih ,&nbsp;Aia S. Lafta ,&nbsp;Ream A. Hussain ,&nbsp;Mustafa A. Alheety","doi":"10.1016/j.rechem.2025.102135","DOIUrl":"10.1016/j.rechem.2025.102135","url":null,"abstract":"<div><div>This work included preparing and characterizing new platinum complexes with the ligand 3,4,5-trimethoxybenzoic acid (TMB). The reactions were carried out using an autoclave in microwave within 3 min only in an alkali medium of triethylamine, where two moles of TMB reacted with one mole of platinum ion and two moles of PPh₃, or with one mole of diphosphines (Bis(diphenylphosphino)x; x = methane (dppm), ethane (dppe), propane (dppp), ferrocene (dppf)). The prepared complexes were characterized by measuring melting points and by the techniques of (C.H.N), molar electrical conductivity, FT-IR and ¹H NMR. The characterization results demonstrated that the TMB ligand behaves as a bidentate ligand through the oxygen atom of the carboxylic groups, and its geometric shape is a square planar around the platinum ion. The complex formed with high yield ([Pt(TMB)₂(dppf)]) was used in hydrogen storage application. The storage isotherm showed that the complex has a high storage capacity of about 4.2 wt% at 61 bar under low temperature (77 K). The study showed that the thermodynamic functions were − 0.67KJ/mol and − 3.6 <em>J</em>/mol H₂ for enthalpy and entropy, indicating the occurrence of physical hydrogen storage.</div></div>","PeriodicalId":420,"journal":{"name":"Results in Chemistry","volume":"14 ","pages":"Article 102135"},"PeriodicalIF":2.5,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating Xanthium spinosum extract as an eco-friendly corrosion inhibitor for Aluminium in acidic environments: A green approach to metal protection","authors":"Mahmoud N. EL-Haddad,&nbsp;A.S. Fouda","doi":"10.1016/j.rechem.2025.102136","DOIUrl":"10.1016/j.rechem.2025.102136","url":null,"abstract":"<div><div>The impact of <em>Xanthium spinosum</em> (Xs) extract on the dissolution of aluminium (Al) in hydrochloric acid (HCl) solution was assessed through various methods, including gravimetric (GM) analysis, potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), and electrochemical frequency modulation spectroscopy (EFM). The surface morphology of the corroded Al was analyzed using atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). Gravimetric measurements indicated that a concentration of 300 ppm of Xs at 298 K resulted in an inhibition efficiency of 93.1 %. The adsorption of Xs onto Al conformed to the Langmuir isotherm model, while PDP analysis classified Xs as a mixed-type inhibitor. EIS data displayed a capacitive loop at high frequencies and an inductive loop at low frequencies. The reliability of EFM data was supported by CF² and CF³ values. The inhibition mechanism was clarified through experimental findings, along with AFM and XPS analyses, confirming Xs as an effective and environmentally friendly corrosion inhibitor.</div></div>","PeriodicalId":420,"journal":{"name":"Results in Chemistry","volume":"14 ","pages":"Article 102136"},"PeriodicalIF":2.5,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Novel branched Heteroaromatic Pyrazole-based Polyazomethines as anticancer agents","authors":"Aqilah A. Hakami ,&nbsp;Salsabeel Al-Sodies ,&nbsp;Hajar S. Alorfi ,&nbsp;Abrar S. Alnafisah ,&nbsp;Mahmoud A. Hussein","doi":"10.1016/j.rechem.2025.102129","DOIUrl":"10.1016/j.rechem.2025.102129","url":null,"abstract":"<div><div>A series of novel pyrazole-based polyazomethines incorporating different heteroaromatic moieties was synthesized via the polycondensation of diaminopyrazole with terephthalaldehyde, 10-octylphenothiazine-3,7-dicarbaldehyde, and 9-hexylcarbazole-3,6-dicarbaldehyde. The polymers were characterized using FT-IR, XRD, SEM, GPC, and TGA/DTG techniques. FT-IR spectroscopy confirmed successful polymerization in the presence of imine linkages. XRD revealed the crystalline nature of the polymers, whereas SEM showed distinct morphological differences between <strong>PAT</strong> and <strong>PPTz-C8</strong>. GPC analysis indicated molecular weights ranging from 27,800 Da to 55,800 Da, with <strong>PPTz-C8</strong> exhibiting the highest molecular weight and viscosity. TGA/DTG demonstrated the thermal stability of the polymers, with <strong>PCz-C6</strong> exhibiting the highest thermal stability. The antimicrobial activities of the polymers were evaluated against gram-negative and gram-positive bacteria as well as against fungi. <strong>PPTz-C8</strong> and <strong>PCz-C6</strong> displayed the most potent antibacterial activity against <em>E. coli</em>. The anticancer activity of the polymers was assessed against human colorectal cancer (HCT116) cells, with the monomer and <strong>PAT</strong> exhibiting the highest potency. The incorporation of different heteroaromatic moieties significantly influenced the properties and biological activities of polyazomethines, making them promising candidates for various applications in materials science and medicinal chemistry.</div></div>","PeriodicalId":420,"journal":{"name":"Results in Chemistry","volume":"14 ","pages":"Article 102129"},"PeriodicalIF":2.5,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advances in metal-organic frameworks for microplastic removal from aquatic environments: Mechanisms and performance insights","authors":"Fateme Barari ,&nbsp;Mohaddeseh Eydi Gabrabad ,&nbsp;Ziaeddin Bonyadi ,&nbsp;Bahman Ramavandi","doi":"10.1016/j.rechem.2025.102132","DOIUrl":"10.1016/j.rechem.2025.102132","url":null,"abstract":"<div><div>Metal-organic frameworks (MOFs) are highly effective materials for mitigating microplastic (MP) pollution in aquatic environments, owing to their exceptional porosity, large surface area, and selective affinity for pollutants. This study evaluates the performance of MOFs in MP removal by analyzing findings from over 65 studies, with a detailed focus on 20 key papers. Approximately 32 % of the studies investigated polystyrene (PS) MPs, and a similar percentage examined MP concentrations ranging from 10 to 1000 mg/L. Notably, 47 % of the studies reported that contact times exceeding 200 min significantly enhanced MP removal, while 36 % indicated optimal removal efficiencies at pH levels between 3 and 6. Furthermore, smaller MPs (&lt;1 μm) had higher removal efficiency due to increased surface interactions. Among MOFs, ZIF-67 achieved a 92.1 % removal efficiency for micrometer-sized PS MPs, while PSF/MIL-100(Fe) demonstrated a 98 % removal efficiency even after six reuse cycles. Cr-MOF had a remarkable adsorption capacity of 665 mg/g for PS MPs. Adsorption behaviors predominantly followed pseudo-first-order kinetics and Freundlich isotherms. Mechanistic analyses identified electrostatic attraction, π-π interactions, and acid-base interactions as the primary adsorption pathways of MPs onto MOFs. This study highlights the high efficiency and reusability of MOFs in microplastic removal. Future research should focus on scaling up MOF applications, optimizing synthesis methods to increase efficiency and reduce cost, and addressing the potential environmental impacts of large-scale MOF deployment.</div></div>","PeriodicalId":420,"journal":{"name":"Results in Chemistry","volume":"14 ","pages":"Article 102132"},"PeriodicalIF":2.5,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Solvent extraction of some univalent cations into nitrobenzene solution of dicarbollylcobaltate and extractants containing two or three oxyamide groups","authors":"Petr Vaňura ,&nbsp;Pavel Selucký","doi":"10.1016/j.rechem.2025.102104","DOIUrl":"10.1016/j.rechem.2025.102104","url":null,"abstract":"<div><div>Stability constants of the complexes of some commercially available ligands, containing two or three oxyamide groups in nitrobenzene have been determined from the extraction data. The systems aqueous solution of sodium or lithium picrates – nitrobenzene solution of the ligand and aqueous solution of nitrate of univalent cation – equimolar mixture of ligand and sodium dicarbollylcobaltate in nitrobenzene were used. We found that the stability constants generally increase with the decreasing ionic diameter of the respective cation. The stability constants of lithium with Lithium Ionophore VIII and Sodium ionophore I are higher than that with any other ligands known.</div></div>","PeriodicalId":420,"journal":{"name":"Results in Chemistry","volume":"14 ","pages":"Article 102104"},"PeriodicalIF":2.5,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143445370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sucrose auto-combustion synthesis of Al3+ and Cr3+ substituted LaFeO3 ceramic perovskite: Structural, magnetic, and electrical characterizations","authors":"M.A. Gabal ,&nbsp;D.S. Alosaimi ,&nbsp;Y.M. Al Angari ,&nbsp;A. Awad ,&nbsp;A.A. Al-Juaid ,&nbsp;W. Shirbeeny ,&nbsp;Abdu Saeed","doi":"10.1016/j.rechem.2025.102126","DOIUrl":"10.1016/j.rechem.2025.102126","url":null,"abstract":"<div><div>A comparative study for elaborating structural, magnetic, and electrical characteristics of solid solutions LaFe_1-<em>y</em>A_<em>y</em>O₃ (<em>y</em> = 0.0 to 0.5 and A is either Cr⁺³ or Al⁺³) prepared via sucrose sol-gel auto-combustion route. The structure of the samples was studied using X-ray diffraction (XRD), which proved the orthorhombic perovskite structure formation of all samples except for the sample with an Al-content of 0.5. The estimated crystallite sizes, as well as lattice parameters, showed a steady decline as substitution increased, owing to their ionic radii. FT-IR indicated a noticeable shift in the band centers of octahedral sites in the Al-substituted system with successive substitution. TEM exhibited agglomerated sphere-like. The Al-substituted system indicated both antiferromagnetic and ferromagnetic in contrast to the Cr-substituted system, which indicated only anti-ferromagnetic ordering. The obvious increase in the magnetization with successive substitution was discussed in relation to the obtained crystallite sizes. AC-conductivity measurements indicated semi-conducting behavior with increasing conductivity by increasing substitution ratio, especially with chromium-substituted samples. The formed Al₂O₃ secondary phase for the sample with the Al-content of 0.5 indicated an obvious reduction in its estimated electromagnetic properties.</div></div>","PeriodicalId":420,"journal":{"name":"Results in Chemistry","volume":"14 ","pages":"Article 102126"},"PeriodicalIF":2.5,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}