Showing papers on "Fourier transform infrared spectroscopy published in 2022"
TL;DR: In this paper , the authors analyzed digested human lung tissue samples (n = 13) using μFTIR spectroscopy (size limitation of 3 μm) to detect and characterise any airborne microplastics present.
235 citations
TL;DR: In this paper , a carbon paste electrode modified with ZIF-8/g-C3N4/Co nanocomposite and 1-methyl-3-butylimidazolium bromide as an ionic liquid was employed as a highly sensitive reproducible electrochemical sensor for the simultaneous determination of these common dyes.
204 citations
TL;DR: In this article, ZnO NPs were synthesized from Synadium grantii leaf extricate with varying Cu-dopant concentrations, and the photocatalytic studies of the prepared samples were studied using Methylene blue (MB), Indigo Carmine (IC), and Rhodamine B (RhB) organic pollutants.
175 citations
TL;DR: In this paper , ZnO NPs were synthesized from Synadium grantii leaf extricate with varying Cu-dopant concentrations, and the photocatalytic studies of the prepared samples were studied using Methylene blue (MB), Indigo Carmine (IC), and Rhodamine B (RhB) organic pollutants.
170 citations
TL;DR: In this paper, aqueous extract of Phoenix roebelenii palm leaves has been utilized for the first time as an effective chelating/stabilizing agent used to synthesize zinc oxide nanoparticles (ZnO NPs) via a green chemistry approach.
101 citations
TL;DR: In this paper , the authors used plastic-based terephthalic acid for the synthesis of MIL-125, which was further modified by the -NH2 and -NO2 groups.
Abstract: Development of efficient and stable catalyst for the degradation of chlorinated volatile organic compounds (VOCs) is a hot research topic. In this study, we used plastic-based terephthalic acid for the synthesis of MIL-125, which further modified by the -NH2 and -NO2 groups. DFT calculations revealed that the N orbitals had an important contribution in reducing the band gap, leading to easier hydrogen absorption and high electron transfer efficiency. Optical studies, XPS, TRES, NH3-TPD and pyridine IR further demonstrated that the amino modification promoted the visible absorption range and acidity of MIL-125 in comparison to the nitro modification, resulting in efficient catalytic degradation of chlorobenzene and toluene, even in the presence of water. This work provides an economically feasible strategy for modifying metal organic frameworks (MOFs) and suggests the possible VOCs degradation pathways with EPR, in situ FTIR, GC-MS and TG-MS analysis.
101 citations
TL;DR: In this article , aqueous extract of Phoenix roebelenii palm leaves has been utilized for the first time as an effective chelating/stabilizing agent used to synthesize zinc oxide nanoparticles (ZnO NPs) via a green chemistry approach.
87 citations
TL;DR: Electrochemical in situ Fourier transform infrared spectroscopy results and theoretical calculations disclose that the Ga-O-Pt3Mn nanocatalyst featuring an unconventional p-d orbital hybridized interface not only promote the C-C bond-breaking and rapid oxidation of -OH of ethanol, but also inhibit the generation of poisonous CO intermediate species.
Abstract: Constructing monodispersed metal site in heterocatalysis is an efficient strategy to boost their catalytic performance. Herein, a new strategy to advance fundamental interface study on monodispersed metal site tailored Pt-based nanoctalysts is addressed by engineering unconventional p-d orbital hybridization to regulate the interfacial physico-chemical property. Serving as a proof-of-concept example, the monodispersed Ga site on Pt3Mn nanocrystals (Ga-O-Pt3Mn) covered with high-indexed facets was constructed for the first time to drive ethanol electrooxidation reaction (EOR). Strikingly, the Ga-O-Pt3Mn nanocatalyst shows an enhanced EOR performance with achieving 8.41 times of specific activities than that of Pt/C. The electrochemical in situ Fourier transform infrared spectroscopy results and theoretical calculations disclose that the Ga-O-Pt3Mn nanocatalyst featuring an unconventional p-d orbital hybridized interface not only promote the C-C bond-breaking and rapid oxidation of -OH of ethanol, but also inhibit the generation of poisonous CO intermediate species. This work disclosed a promising strategy to construct a novel active and stable nanocatalysts tailored by monodispersed metal site as efficient fuel cell catalysts.
74 citations
TL;DR: In this article, the authors investigated the impact of ultrasound pretreatment on the formation of soy protein fibrils, interaction of soy proteins and EGCG, rheological properties and antioxidant activity of the complex.
73 citations
TL;DR: ZIF-8@Ti3C2Tx was synthesized to reduce the heat and toxic gases of flexible polyurethane foam (FPUF) as mentioned in this paper, which was characterized by cone calorimeter (Cone), thermogravimetric analysis/fourier transform infrared spectroscopy (TG-FTIR), tensileand compression tests.
71 citations
TL;DR: ZIF-8@Ti3C2Tx was synthesized to reduce the heat and toxic gases of flexible polyurethane foam (FPUF) as mentioned in this paper , which was characterized by cone calorimeter (Cone), thermogravimetric analysis/fourier transform infrared spectroscopy (TG-FTIR), tensileand compression tests.
TL;DR: In this paper , a simple solvothermal synthesis method was proposed for the preparation of metal organic framework/graphene oxide hybrid nanocomposite (UiO-67/GO).
TL;DR: This is the first study of Cr( VI) removal from aqueous solution using this hybrid nanocomposite at near-neutral pH and the thermodynamics study reveals that Cr(VI) adsorption on ZnO-GO is spontaneous, endothermic, and entropy-driven.
TL;DR: In this paper, the authors used glutaraldehyde as a hydrophobic modifier to crosslink polyvinyl alcohol (PVA), and copper ion was immobilized by sodium alginate (SA).
TL;DR: In this article , the authors used glutaraldehyde as a hydrophobic modifier to crosslink polyvinyl alcohol (PVA), and copper ion was immobilized by sodium alginate (SA).
TL;DR: In this article , two nationwide surveys of personal protective equipment (PPE) pollution were conducted in Peru and Argentina aiming to provide valuable information regarding the abundance and distribution of PPE in coastal sites.
TL;DR: In this article , the authors investigated the impact of ultrasound pretreatment on the formation of soy protein fibrils, interaction of soy proteins and EGCG, rheological properties and antioxidant activity of the complex.
TL;DR: In this paper, two novel kinds of amine-functionalized silsesquioxane (SQ)-based hybrid networks (PCS-N1, N2) with different molar ratios of NH2/NH- and NH3+ were successfully prepared via nucleophilic substitution of octa(3-chloropropyl) silsquioxanes with triaminoethylamine, respectively.
TL;DR: In this article , decorated zinc oxide (ZnO) nanoparticles (NPs) on graphene oxide nanoparticles were synthesized via the solvothermal process, and the surface deposition of ZnO-GO was characterized through Fourie Transform Infra-red (FTIR), UV-Visible, X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive Spectroscopy (EDS), and Brunauer-Emmett-Teller (BET) techniques.
Abstract: Metal-based adsorbents are limited for hexavalent chromium [Cr(VI)] adsorption from aqueous solutions because of their low adsorption capacities and slow adsorption kinetics. In the present study, decorated zinc oxide (ZnO) nanoparticles (NPs) on graphene oxide (GO) nanoparticles were synthesized via the solvothermal process. The deposition of ZnO NPs on graphene oxide for the nanohybrid (ZnO-GO) improves Cr(VI) mobility in the nanocomposite or nanohybrid, thereby improving the Cr(VI) adsorption kinetics and removal capacity. Surface deposition of ZnO on graphene oxide was characterized through Fourie Transform Infra-red (FTIR), UV-Visible, X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive Spectroscopy (EDS), and Brunauer-Emmett-Teller (BET) techniques. These characterizations suggest the formation of ZnO-GO nanocomposite with a specific area of 32.95 m2/g and pore volume of 0.058 cm2/g. Batch adsorption analysis was carried to evaluate the influence of operational parameters, equilibrium isotherm, adsorption kinetics and thermodynamics. The removal efficiency of Cr(VI) increases with increasing time and adsorbent dosage. FTIR, FESEM and BET analysis before and after the adsorption studies suggest the obvious changes in the surface functionalization and morphology of the ZnO-GO nanocomposites. The removal efficiency increases from high-acidic to neutral pH and continues to decrease under alkaline conditions as well. Mathematical modeling validates that the adsorption follows Langmuir isotherm and fits well with the pseudo 2nd order kinetics (Type 5) model, indicating a homogeneous adsorption process. The thermodynamics study reveals that Cr(VI) adsorption on ZnO-GO is spontaneous, endothermic, and entropy-driven. A negative value of Gibb's Free Energy represents the thermodynamic spontaneity and feasibility of the sorption process. To the best of our knowledge, this is the first study of Cr(VI) removal from aqueous solution using this hybrid nanocomposite at near-neutral pH. The synthesized nanocomposites prove to be excellent candidates for Cr(VI) removal from water bodies and natural wastewater systems.
TL;DR: In this article , two novel kinds of amine-functionalized silsesquioxane (SQ)-based hybrid networks (PCS-N1, N2) with different molar ratios of NH2/NH- and NH3+ were successfully prepared via nucleophilic substitution of octa(3-chloropropyl) silsquioxanes with triaminoethylamine, respectively.
TL;DR: In this article , the first covalent incorporation of reactive aliphatic amine species into COFs was reported through the crystallization of an imine-linked COF, termed COF-609-Im, followed by conversion of its imine linkage to base-stable tetrahydroquinoline linkage through aza-Diels-Alder cycloaddition.
Abstract: We report the first covalent incorporation of reactive aliphatic amine species into covalent organic frameworks (COFs). This was achieved through the crystallization of an imine-linked COF, termed COF-609-Im, followed by conversion of its imine linkage to base-stable tetrahydroquinoline linkage through aza-Diels-Alder cycloaddition, and finally, the covalent incorporation of tris(3-aminopropyl)amine into the framework. The obtained COF-609 exhibits a 1360-fold increase in CO2 uptake capacity compared to the pristine framework and a further 29% enhancement in the presence of humidity. We confirmed the chemistry of framework conversion and corroborated the enhanced CO2 uptake phenomenon with and without humidity through isotope-labeled Fourier transform infrared spectroscopy and solid-state nuclear magnetic resonance spectroscopy. With this study, we established a new synthetic strategy to access a class of chemisorbents characterized by high affinity to CO2 in dilute sources, such as the air.
TL;DR: In this paper , the authors investigated the non-covalent interaction mechanism between soy protein isolate (SPI) and catechin and its effect on protein conformation and particle size.
TL;DR: In this article, a gallic acid-modified chitosan-based (CS-GA) hydrogel was prepared through discharge plasma technology, which was first reported to realize polysaccharide-macromolecule-grafted phenolic acids.
TL;DR: In this article , a case study that highlights that fly ash posed a very good potential as a material for Congo Red dye removal was presented, and the fit to pseudo-second-order kinetics models suggests that the removal process is a chemical adsorption.
Abstract: The Congo Red dye was removed from a simulated textile wastewater solution using fly ash from a local power plant. The characterisation of fly ash was studied in detail by SEM, EDX, XRD, FTIR, BET surface area and TGA techniques. The influence of four parameters (contact time, initial concentration, adsorbent dose, and temperature) was analysed, the results showing that the adsorption capacity depends on these parameters. Thermodynamic and regeneration investigations as well are presented. The fit to pseudo-second-order kinetics models suggests that the removal process is a chemical adsorption. The Langmuir model fitted the experimental data, with a maximum adsorption capacity of 22.12 mg/g. The research is a preliminary case study that highlights that fly ash posed a very good potential as a material for Congo Red dye removal.
TL;DR: In this paper, the simultaneous co-immobilization by covalent binding of lipase A from Candida antarctica (CALA) and lipase B from CALB in glutaraldehyde activated chitosan (CHI) was optimized using the Taguchi method.
Abstract: In the present communication, the simultaneous co-immobilization by covalent binding of lipase A from Candida antarctica (CALA) and lipase B from Candida antarctica (CALB) in glutaraldehyde (GLU) activated chitosan (CHI) was optimized using the Taguchi method. Under optimized conditions (pH 9, 5 mM, 6:1 (protein load/g of support and 1 h), it was possible to reach 80.00 ± 0.01% for the immobilization yield (IY) and 46.01 ± 0.35 U/g for the activity of the derivative (AtD); in this case, load protein and ionic strength were the only statistically significant parameters and, therefore, those that most influenced the immobilization process. Furthermore, at pH 7, CALA-CALB-CHI had a half-life 2–6 times longer than the mixture of CALA and CALB for a temperature range of 50−80 °C. CALA-CALB showed the highest activity at pH 7, whereas CALA-CALB-CHI, except at pH 7, was more active than the soluble lipase mixture in the pH range (5–9), especially at pH 9. CHI, CHI-GLU, and CALA-CALB-CHI were characterized by X-ray powder diffraction (XRPD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope (SEM), Thermogravimetry (TGA), and Energy Dispersive Spectroscopy (EDS), proving the immobilization of CALA and CALB in chitosan. CALA-CALB-CHI derivative evaluated in the kinetic resolution of halohydrins acetates rac-2-bromo-1-(2-chlorophenyl) ethyl acetate (2a) and rac-2-chloro-1-(2,4-dichlorophenyl) ethyl acetate (2b), to produce the corresponding halohydrins 3a-b, which are intermediates in the synthesis of the drugs chlorprelanine (antiarrhythmic) and luliconazol (antifungal), respectively. (S)-bromohydrin 3a was obtained with 79% enantiomeric excess (ee), whereas (S)-chlorohydrin 3b produced with 98% ee, conversion of 46% and E > 200. Additionally, molecular docking was performed to elucidate the hydrolysis interaction reaction between β-halohydrin acetates and lipases CALA-CALB.
TL;DR: In this paper , the simultaneous co-immobilization by covalent binding of lipase A from Candida antarctica (CALA) and lipase B from CALB in glutaraldehyde activated chitosan (CHI) was optimized using the Taguchi method.
Abstract: In the present communication, the simultaneous co-immobilization by covalent binding of lipase A from Candida antarctica (CALA) and lipase B from Candida antarctica (CALB) in glutaraldehyde (GLU) activated chitosan (CHI) was optimized using the Taguchi method. Under optimized conditions (pH 9, 5 mM, 6:1 (protein load/g of support and 1 h), it was possible to reach 80.00 ± 0.01% for the immobilization yield (IY) and 46.01 ± 0.35 U/g for the activity of the derivative (AtD); in this case, load protein and ionic strength were the only statistically significant parameters and, therefore, those that most influenced the immobilization process. Furthermore, at pH 7, CALA-CALB-CHI had a half-life 2–6 times longer than the mixture of CALA and CALB for a temperature range of 50−80 °C. CALA-CALB showed the highest activity at pH 7, whereas CALA-CALB-CHI, except at pH 7, was more active than the soluble lipase mixture in the pH range (5–9), especially at pH 9. CHI, CHI-GLU, and CALA-CALB-CHI were characterized by X-ray powder diffraction (XRPD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope (SEM), Thermogravimetry (TGA), and Energy Dispersive Spectroscopy (EDS), proving the immobilization of CALA and CALB in chitosan. CALA-CALB-CHI derivative evaluated in the kinetic resolution of halohydrins acetates rac-2-bromo-1-(2-chlorophenyl) ethyl acetate (2a) and rac-2-chloro-1-(2,4-dichlorophenyl) ethyl acetate (2b), to produce the corresponding halohydrins 3a-b, which are intermediates in the synthesis of the drugs chlorprelanine (antiarrhythmic) and luliconazol (antifungal), respectively. (S)-bromohydrin 3a was obtained with 79% enantiomeric excess (ee), whereas (S)-chlorohydrin 3b produced with 98% ee, conversion of 46% and E > 200. Additionally, molecular docking was performed to elucidate the hydrolysis interaction reaction between β-halohydrin acetates and lipases CALA-CALB.
TL;DR: In this article , a facile one-pot protocol was used to synthesize Ni-cobalt zeolitic imidazolate framework (Ni-ZIF-67) nanocomposite, which was then characterized by Fourier transform infrared spectroscopy, X-ray diffraction, energy dispersive Xray spectroscopic and scanning electron microscopy.
TL;DR: In this paper, an effective metal-organic framework adsorbent was fabricated by grafting thioglycollic acid on MOF-808 for Hg(II) removal, which demonstrated high adsorption capacity of 977.5
TL;DR: In this article , a photocatalyst of layered structural BiOBr doped with sulfur (S-BiOBr) was synthesized using a facile hydrothermal method, which exhibited excellent performance for the intercalation, adsorption and photocatalytic degradation of ciprofloxacin (CIP) by forming interlayer [Bi2O2S]2+--OOC-R complexes.
Abstract: A photocatalyst of layered structural BiOBr doped with sulfur (S-BiOBr) was synthesized using a facile hydrothermal method. X-ray powder diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and density functional theory calculation revealed that S-BiOBr consisted of covalent [Bi2O2S]2+ layer and exchangeable bromide ions [Br2]2-. The specific layered structure of S-BiOBr exhibited excellent performance for the intercalation, adsorption and photocatalytic degradation of ciprofloxacin (CIP) by forming interlayer [Bi2O2S]2+--OOC-R complexes. Furthermore, the internal electric field enhanced by polarization effects in the [Bi2O2S]2+ layer was conducive to a lasting electron transfer in the dark condition after photoactivation. The electron of R• radical derived from oxidizing [Bi2O2S]-OOC-R persistently migrated to the S-BiOBr surface and was trapped by O2 to form O2•-, facilitating the degradation of CIP in the dark. Hence, the degradation of CIP could be realized by utilizing the R• radical triggered through transient photoinitiation with low optical energy consumption.
TL;DR: In this article, a photocatalyst of layered structural BiOBr doped with sulfur (S-BiOBr) was synthesized using a facile hydrothermal method, which exhibited excellent performance for the intercalation, adsorption and photocatalytic degradation of ciprofloxacin (CIP) by forming interlayer [Bi2O2S]2+--OOC-R complexes.
Abstract: A photocatalyst of layered structural BiOBr doped with sulfur (S-BiOBr) was synthesized using a facile hydrothermal method. X-ray powder diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and density functional theory calculation revealed that S-BiOBr consisted of covalent [Bi2O2S]2+ layer and exchangeable bromide ions [Br2]2-. The specific layered structure of S-BiOBr exhibited excellent performance for the intercalation, adsorption and photocatalytic degradation of ciprofloxacin (CIP) by forming interlayer [Bi2O2S]2+--OOC-R complexes. Furthermore, the internal electric field enhanced by polarization effects in the [Bi2O2S]2+ layer was conducive to a lasting electron transfer in the dark condition after photoactivation. The electron of R• radical derived from oxidizing [Bi2O2S]-OOC-R persistently migrated to the S-BiOBr surface and was trapped by O2 to form O2•-, facilitating the degradation of CIP in the dark. Hence, the degradation of CIP could be realized by utilizing the R• radical triggered through transient photoinitiation with low optical energy consumption.