jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Fatereh Dorosti | Lei Ge | Hao Wang | John Bell | Rijia Lin | Jingwei Hou | Zhonghua Zhu
Source: Angewandte Chemie International Edition (article, 2024-11-17)
Field: Chemistry — Inorganic Chemistry

Non‐selective Defect Minimization towards Highly Efficient Metal‐Organic Framework Membranes for Gas Separation The persistence of defects in polycrystalline membranes poses a substantial obstacle to reaching the theoretical molecular sieving separation and scaling up production. The low membrane selectivity in most reported literature is largely due to the unavoidable non-selective defects during synthesis, leading to a mismatch between the well-defined pore structure of polycrystalline molecular sieve materials. This paper presents a novel approach for minimizing non-selective defects in metal-organic framework (MOF) membranes by a constricted crystal growth strategy in a confined environment. The in situ ZIF formation using the densely packed seeding array between the substrate and the pre-grown top ZIF layer yields a confined membrane interlayer, which is highly uniform with a tightly packed crystalline structure. Unlike uncontrolled crystal growth, we purposely regulate the interlayer membrane growth in the direction parallel to the substrate. A notable 99 % decrease in defects in the confined interlayer was achieved compared to the random-grown top layer, leading to a ~353 % increment in H<sub>2</sub>/N<sub>2</sub> selectivity over the non-confined reference MOF membrane. The performance of this new membrane sits in the optimal range above the Robeson upper bound. The membrane boasts a balanced high H<sub>2</sub> permeability (>5000 Barrer) and selectivity (>50), significantly surpassing peer ZIF membranes. Membrane ; Selectivity ; Materials science ; Crystallite ; Gas separation ; Metal-organic framework ; Molecular sieve ; Chemical engineering ; Substrate (aquarium) ; Nanotechnology ; Chemistry ; Catalysis ; Adsorption ; Organic chemistry Metal-Organic Frameworks: Synthesis and Applications ; Membrane Separation and Gas Transport ; Catalytic Processes in Materials Science
Authors: Gautham Krishna | Dushyanth V Babu R
Source: Applied Organometallic Chemistry (article, 2024-06-17)
Field: Chemistry — Organic Chemistry

Waste to resource: Engineered ridge gourd peel‐based activated carbon for enhanced cephalexin adsorption This research investigates the efficacy of ridge gourd peel‐derived activated carbon (RGAC), activated with zinc chloride, for the removal of the antibiotic pollutant cephalexin (CFX) from aqueous solutions. Ensuring the elimination of cephalexin residues from aquatic environments is crucial for curbing the emergence of antibiotic‐resistant bacteria and preserving the balance of ecosystems. RGAC exhibits exceptional characteristics, with a surface area of 945.857 m 2 /g and a pore size of 1.7 nm, as determined through thorough structural analysis. Scanning electron microscopy and Fourier transform infrared analysis confirm the presence of various functional groups on RGAC's surface which aids in adsorption process, while zeta potential analysis indicates a negative surface charge of −18.11 mV. As experimental investigation, batch study was conducted considering distilled water spiked with CFX under standard condition for treatment with RGAC. Impressively, RGAC demonstrates a high CFX adsorption capacity of 37.56 mg/g, also achieving more than 90% CFX removal efficiency. Fitting of the Langmuir isotherm ( R 2 = 0.9647) and the pseudo‐second‐order kinetics model ( R 2 = 0.99) reveals strong agreement between theoretical predictions and experimental results. Furthermore, real‐time sampling and regeneration studies underscore RGAC's potential as a commercially viable adsorbent for addressing antibiotic micro‐pollutants in aquatic environments. Throughout six cycles of regeneration studies, a stable pattern emerged, showcasing rejection rates consistently between 81% and 93%. These findings contribute significantly to the advancement of environmentally sustainable water treatment strategies and pollution mitigation efforts. Chemistry ; Gourd ; Adsorption ; Ridge ; Carbon fibers ; Activated carbon ; Chemical engineering ; Food science ; Organic chemistry ; Composite material Nanomaterials for catalytic reactions ; Electrochemical sensors and biosensors ; Adsorption and biosorption for pollutant removal
Authors: Haththotuwa Gamage Amal Sudaraka Samarasinghe | G. A. D. B. Sandarenu Dharmaprema | Jayathissa Arachchilage Udani Manodya | Kalmee Pramoda Kariyawasam | Udara Chandrajith Samaranayake
Source: Turkish Journal of Agriculture - Food Science and Technology (review, 2024-02-27)
Field: Chemistry — Analytical Chemistry

Exploring Impact of the Ultrasound and Combined Treatments on Food Quality: A Comprehensive Review As a response to the evolving consumer demand for healthier food choices, ultrasound application in food processing emerges as a sustainable and green solution with no residual effects. This method, known for its cost-efficiency and sustainability, holds significant promise in meeting the increasing need for high-quality, chemical-free, and natural-tasting convenience foods in the ever-changing landscape of the food industry. Ultrasound, leveraging mechanical sound waves, spans across various frequencies: power ultrasound (20–100 kHz), high-frequency ultrasound (100 kHz-1 MHz), and diagnostic ultrasound (1–500 MHz). This study focuses on investigating the impact of ultrasound and combined treatments on food quality, summarizing their diverse applications across different unit operations such as texture and rheology, emulsification and homogenization, crystal formation and modification, dehydration and drying, fermentation, filtration, preservation and shelf-life extension, flavor enhancement, color and appearance, antioxidant activity, enzyme activity and food digestibility, bioavailability and bio-accessibility, and specific food divisions including unprocessed, minimally processed, processed, and ultra-processed foods, as well as culinary ingredients. It delves into their effects on technological and functional aspects of food products, explores emerging trends, offers possible recommendations in ultrasound technology for the food industry, while also recognizing existing challenges and limitations associated with ultrasound and related technologies. Ultrasound ; Quality (philosophy) ; Medicine ; Philosophy ; Radiology ; Epistemology Spectroscopy and Chemometric Analyses ; Food Industry and Aquatic Biology ; Meat and Animal Product Quality
Authors: Badr M. Thamer | Faiz A. Al‐aizari | Hany S. Abdo | Mohamed H. El‐Newehy
Source: Polymer Engineering and Science (article, 2024-08-14)
Field: Chemistry — Inorganic Chemistry

Facile green fabrication of <scp>MIL</scp> ‐101(Cr)/ <scp>PVA</scp> nanofiber composite as effective, stable, and reusable adsorbent for cationic dye removal Abstract In this study, chromium‐based metal–organic framework (MIL‐101(Cr)) was incorporated into polyvinyl alcohol nanofibers (PVA NFs) via green electrospinning followed by heat treatment to fabricate MIL‐101(Cr)@PVA NFs composite without the need for any organic solvent or other dispersants. The fabricated MIL‐101(Cr)@PVA NFs were comprehensively characterized using a suite of common techniques. Morphological characteristics of MIL‐101(Cr)@PVA NFs showed a fibrous structure with an average diameter of 228 ± 37 nm and decorated with MIL‐101(Cr) particles arranged in a nanoneedle‐like pattern. Subsequently, its adsorption efficiency towards the cationic crystal violet dye (CV) was evaluated through batch adsorption experiments. The influence of various experimental parameters on CV removal efficiency was systematically optimized using a factorial design approach. The Langmuir isotherm and kinetic pseudo‐second‐order (PSO) model provided an excellent fit to the adsorption equilibrium data, indicating a maximum adsorption capacity ( q max ) of 344.18 mg/g for MIL‐101(Cr)@PVA NFs compared with 83.94 mg/g for pristine PVA NFs. Furthermore, the MIL‐101(Cr)@PVA NFs composite demonstrated excellent reusability and stability, maintaining a significant portion of its removal capacity even after six adsorption–desorption cycles. These findings highlight the potential of the fabricated composite as a highly efficient and reusable adsorbent for CV removal from wastewater treatment applications. Highlights The MIL‐101(Cr)@PVA NFs nanocomposite fabricated by electrospinning technique. The MIL‐101(Cr) particle arranged in a nanoneedle‐like pattern in the PVA NFs. Incorporation of MIL‐101(Cr) improved q max of PVA by 391.5%. The MIL‐101(Cr)@PVA NFs membrane has excellent stability and reusability. Materials science ; Polyvinyl alcohol ; Adsorption ; Electrospinning ; Chemical engineering ; Langmuir adsorption model ; Composite number ; Nanofiber ; Dispersant ; Cationic polymerization ; Composite material ; Polymer ; Polymer chemistry ; Dispersion (optics) ; Organic chemistry ; Chemistry Metal-Organic Frameworks: Synthesis and Applications ; Adsorption and biosorption for pollutant removal ; Covalent Organic Framework Applications
Authors: Negar Safaran | Shohreh Javadi | Mehrab Pourmadadi | Amirhossein Ghaemi | Fatemeh Yazdian | Hamid Rashedi | Abbas Rahdar | M. Ali Aboudzadeh
Source: Journal of Nanoparticle Research (article, 2024-08-01)
Field: Materials Science — Biomaterials

Advances in polymeric and non-polymeric nanocarriers for the magnified delivery of levofloxacin against bacterial infection Abstract This review examines the latest developments in nanoscopic antibiotic formulations used to treat infections caused by bacteria. A wide range of nanocarrier platforms are discussed, including polymer-based nanoparticles (NPs), lipid-based vesicles, mesoporous silica, and other inorganic materials. The antibiotic levofloxacin (LVF) is predominantly used as a model drug given its broad-spectrum activity. Studies in this regard have evaluated drug loading and encapsulation efficiency (EE) using analytical techniques such as FTIR, DLS, and TEM. In vitro release kinetics was characterized through dialysis and fluorescence-based assays. Zone of inhibition and viability studies provided insights into antibacterial efficacy. Some approaches incorporated stimuli-responsive polymers or targeting ligands to facilitate controlled or targeted drug release. Overall, the nanocarriers demonstrated potential for sustained antibiotic levels, reduced dosing, and improved treatment of biofilms and intracellular infections compared to free drug administration. The review offers a comprehensive analysis of this promising field with implications for combating antibiotic resistance. Nanocarriers ; Materials science ; Levofloxacin ; Nanotechnology ; Drug delivery ; Microbiology ; Antibiotics Nanoparticle-Based Drug Delivery ; Advanced Drug Delivery Systems ; Orthopedic Infections and Treatments
Authors: Saleem Nawaz | Syed Muhammad Salman | Asad Ali | Basit Ali | Syed Nusrat Shah | Latif Ur Rahman
Source: Frontiers in Chemistry (article, 2024-09-25)
Field: Chemistry — Analytical Chemistry

Kinetics and thermodynamics investigations of efficient and eco-friendly removal of alizarin red S from water via acid-activated Dalbergia sissoo leaf powder and its magnetic iron oxide nanocomposite The present work aimed to highlight an efficient, readily accessible, and cost-effective adsorbent derived from <i>Dalbergia sissoo</i> (DS) leaf powder for removing the environmentally hazardous dye "alizarin red S" (ARS) from hydrous medium. A variant of the adsorbent is activated via sulfuric acid and composited with magnetic iron oxide nanoparticles (DSMNC). Both adsorbents are thoroughly characterized using techniques such as Fourier transform infrared spectroscopy, point of zero charge, energy-dispersive X-ray spectroscopy, and scanning electron microscopy, which show that they have a porous structure rich in active sites. Different adsorption conditions are optimized with the maximum removal efficiency of 76.63% for DS and 97.89% for DSMNC. The study was highlighted via the application of various adsorption isotherms, including Freundlich, Langmuir, Temkin, and Dubinin-Radushkevich, to adsorption data. Pseudo-first-order, pseudo-second-order, and intra-particle diffusion models were utilized to investigate the kinetics and mechanism of adsorption. The Freundlich model and pseudo-second-order kinetics exhibited the best fit, suggesting a combination of physical interactions, as confirmed by the D-R and Temkin models. The dominant adsorbate-adsorbent interactive interactions responsible for ARS removal were hydrogen bonding, dispersion forces, and noncovalent aromatic ring adsorbent pi-interactions. Thermodynamic parameters extracted from adsorption data indicated that the removal of the mutagenic dye "ARS" was exothermic and spontaneous on both DS and DSMNC, with DSMNC exhibiting higher removal efficiency. Kinetics ; Nanocomposite ; Chemistry ; Dalbergia sissoo ; Oxide ; ALIZARIN RED ; Chemical engineering ; Organic chemistry ; Botany ; Materials science ; Nanotechnology ; Biology Dye analysis and toxicity
Authors: Khaled Muftah Elsherif | Abdulfattah Mohammed Alkherraz | Howell G. M. Edwards | Basma Younus Abdulsalam Mutawia
Source: Environmental Health Engineering and Management (article, 2024-06-28)
Field: Chemistry — Analytical Chemistry

Congo red dye adsorption on dry green pea husk: Effects of process parameters and modeling approaches Background: Congo red (CR), a harmful dye present in water, requires effective removal methods. This study investigated the utilization of dry green pea husk (DGPH) and its charcoal (CGPH) as economical and eco-friendly adsorbents. Methods: Various factors, including contact time, pH, adsorbent dosage, initial concentration, and temperature, were investigated to assess their impact on the adsorption process. Also, different models (isotherms, kinetics, and thermodynamics) were compared to describe the adsorption phenomenon. Results: Equilibrium adsorption was achieved within 30 minutes for both adsorbents. The optimum pH for CR removal was determined to be 2. The adsorption capacity decreased by increasing the adsorbent dosage, whereas it increased by increasing the initial dye concentration. The Langmuir isotherm model demonstrated the best fit for DGPH, while the Freundlich model exhibited the best fit for CGPH. The pseudo-second-order model displayed a superior fit for both adsorbents. To assess the spontaneity and feasibility of the adsorption process, thermodynamic parameters including enthalpy, entropy, and Gibbs free energy were computed. The results indicated that the adsorption of CR on DGPH was endothermic and favorable at lower temperatures, whereas the adsorption on CGPH was exothermic and favorable at higher temperatures. The negative values of Gibbs free energy for the CGPH adsorbent confirmed the spontaneous nature of the adsorption process. Conclusion: The study establishes that green pea husk and its charcoal are effective and environmentally friendly alternatives for the removal of CR from water. Congo red ; Husk ; Adsorption ; Process (computing) ; Chemistry ; Botany ; Environmental science ; Biology ; Organic chemistry ; Computer science Dye analysis and toxicity ; Adsorption and biosorption for pollutant removal
Authors: Mobolaji M. Jegede | Olatunde S. Durowoju | Joshua N. Edokpayi
Source: Applied Water Science (article, 2024-02-27)
Field: Chemistry — Analytical Chemistry

Sequestration of Congo Red from aqueous solution using raw and citric acid-modified Dicerocaryum eriocarpum biomass: isotherm, kinetics and thermodynamics Abstract In recent times, dyes such as Congo Red have proven to be resilient environmental pollutants affecting freshwater portability among other media. Its toxicity to humans, animals and plant life is both a cause of concern and a motivation to prioritize decontamination. Many materials have been explored for the removal of this pollutant via adsorption; however, there are notable areas of improvement. Dicerocaryum eriocarpum (DE) seed is a non-toxic, cost-effective plant material which is possible as a sorbent and has not been reported in Congo Red sequestration. This research is therefore based on the removal of Congo Red dye from aqueous solution using raw (RDE) and citric acid-modified DE (CDE). The sorbents were characterized before and after sorption using various characterization techniques such as FTIR, EDS, SEM and BET. The effects of contact time, adsorbent dosage, concentration, pH and temperature were optimized during the experiment. According to experimental findings, modification with citric acid resulted in a reduction of the equilibration interval from 90 to 60 min. Sorption effectiveness increased with an increase in temperature for CDE but a decrease in temperature for RDE. The equilibrium data were best described by the Langmuir isotherm with maximum sorption capacity ( q max ) of 51.02 mg/g and 53.19 mg/g for RDE and CDE, respectively. Pseudo-second-order model better suited the kinetic data, while thermodynamic analysis revealed a spontaneous sorption process. Five cycles of desorption experiments using 0.1 M NaOH revealed that the regenerated sorbent effectively removed CR dye for the first three cycles at comparable efficiency to the virgin samples. This study therefore supports the use of DE seed as an easily accessible and efficient sorbent for remediation of harmful dyes from water. Aqueous solution ; Kinetics ; Citric acid ; Chemistry ; Thermodynamics ; Congo red ; Biomass (ecology) ; Raw material ; Adsorption ; Organic chemistry ; Biology ; Ecology ; Physics Dye analysis and toxicity ; Adsorption and biosorption for pollutant removal
Authors: Gizem Erensoy | Loise Råberg | Ula von Mentzer | Luca Dirk Menges | Endri Bardhi | Anna‐Karin Hultgård Ekwall | Alexandra Stubelius
Source: ACS Applied Bio Materials (article, 2024-05-25)
Field: Materials Science — Biomaterials

Dynamic Release from Acetalated Dextran Nanoparticles for Precision Therapy of Inflammation Polymer-based nanoparticles (NPs) that react to altered physiological characteristics have the potential to enhance the delivery of therapeutics to a specific area. These materials can utilize biochemical triggers, such as low pH, which is prone to happen locally in an inflammatory microenvironment due to increased cellular activity. This reduced pH is neutralized when inflammation subsides. For precise delivery of therapeutics to match this dynamic reaction, drug delivery systems (DDS) need to not only release the drug (ON) but also stop the release (OFF) autonomously. In this study, we use a systematic approach to optimize the composition of acetalated dextran (AcDex) NPs to start (ON) and stop (OFF) releasing model cargo, depending on local pH changes. By mixing ratios of AcDex polymers (mixed NPs), we achieved a highly sensitive material that was able to rapidly release cargo when going from pH 7.4 to pH 6.0. At the same time, the mix also offered a stable composition that enabled a rapid ON/OFF/ON/OFF switching within this narrow pH range in only 90 min. These mixed NPs were also sensitive to biological pH changes, with increased release in the presence of inflammatory cells compared to healthy cells. Such precise and controllable characteristics of a DDS position mixed NPs as a potential treatment platform to inhibit disease flare-ups, reducing both systemic and local side effects to offer a superior treatment option for inflammation compared to conventional systems. Dextran ; Inflammation ; Nanoparticle ; Medicine ; Biomedical engineering ; Materials science ; Chemistry ; Internal medicine ; Nanotechnology ; Chromatography Nanoparticle-Based Drug Delivery ; Advanced Drug Delivery Systems ; Hydrogels: synthesis, properties, applications
Authors: Abdelhak Fezraoui | Damien Cornu | Marc Hébrant
Source: Applied Clay Science (article, 2024-08-22)
Field: Materials Science — Materials Chemistry

Fast and efficient chromium(VI) extraction by colloidal Mg/Al layered double hydroxide nanoparticles Due to the constraints associated with diffusion and mixing time, traditional kinetic and thermodynamic approaches were inadequate for probing the true mechanism of interaction between chromate and Layered Double Hydroxide (LDH). To circumvent these limitations, colloidal suspensions of Mg/Al-NO3 LDH, characterized by a positively charged surface (approximately +50 mV) in ultrapure water and a mean average diameter of 140 nm, allowing the formation of stable suspensions for days, were swiftly mixed with Cr(VI) suspensions at both pH = 4 and 9 using a stopped flow technique. This rapid mixing, accomplished in <5 milliseconds, enabled the examination of the initial stages of interaction between the toxic anion and the host compound. Two distinct steps in the adsorption process were identified: a very fast step (completed in <5 ms), representing up to 80% of the measured variation, and a slower step lasting up to 100 s. The fast step assumed to be driven by electrostatic interaction (ζ ∼ +50 mV) with the surface, and sites close to the surface are easily accessible to the chromate anions. The slower step corresponded to a diffusion process close or inside the particles. Chromate extraction efficiency was investigated through ultrafiltration tests, varying the LDH and chromate amounts, indicating that 2 nitrate ions are exchanged for 1 chromate, regardless of the pH considered, and a total exchange can be fulfilled with 0.1 g L−1 of LDH within the explored concentration range. Hydroxide ; Nanoparticle ; Chromium ; Colloid ; Layered double hydroxides ; Extraction (chemistry) ; Chemistry ; Chemical engineering ; Inorganic chemistry ; Materials science ; Nanotechnology ; Chromatography ; Organic chemistry Layered Double Hydroxides Synthesis and Applications ; Nanomaterials for catalytic reactions ; Advanced Photocatalysis Techniques
Authors: Islam M. Minisy | Oumayma Taboubi | Jiřina Hromádková | Patrycja Bober
Source: Gels (article, 2024-06-22)
Field: Materials Science — Biomaterials

Aerogels of Polypyrrole/Tannic Acid with Nanofibrillated Cellulose for the Removal of Hexavalent Chromium Ions The preparation of conducting polymer aerogels is an effective strategy to produce innovative materials with enhanced physicochemical properties. Herein, polypyrrole (PPy) aerogels were oxidatively prepared in the presence of tannic acid (TA) with different concentrations (2.5, 5, and 10% mole ratio to pyrrole monomer) under freezing conditions. Nanofibrillated cellulose (NFC) was added during the PPy/TA synthesis to enhance mechanical stability. The effect of TA concentration on the aerogels' morphology, conductivity, thermal stability, and adsorption capacity was investigated. The conductivity of 9.6 ± 1.7 S cm<sup>-1</sup> was achieved for PPy/TA prepared with 2.5% TA, which decreased to 0.07 ± 0.01 S cm<sup>-1</sup> when 10% TA was used. PPy/TA aerogels have shown high efficacy in removing Cr(VI) ions from aqueous solutions. Adsorption experiments revealed that all the aerogels follow pseudo-second-order kinetics. PPy/TA prepared with NFC has a maximum adsorption capacity of 549.5 mg g<sup>-1</sup>. Polypyrrole ; Tannic acid ; Adsorption ; Materials science ; Thermal stability ; Cellulose ; Chemical engineering ; Hexavalent chromium ; Aqueous solution ; Monomer ; Polymer ; Polymer chemistry ; Nuclear chemistry ; Chromium ; Chemistry ; Organic chemistry ; Composite material ; Polymerization Advanced Cellulose Research Studies ; Aerogels and thermal insulation ; Adsorption and biosorption for pollutant removal