scholarly journals Acid Treatment Halloysite Nanoclay: Eco-Friendly Heterogeneous Catalyst for the Synthesis of Pyrrole Derivatives

Proceedings ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 17
Author(s):  
Ali Maleki ◽  
Zoleikha Hajizadeh
Keyword(s):  
Infrared Spectroscopy ◽  
Acid Treatment ◽  
High Efficiency ◽  
Fourier Transforms ◽  
Halloysite Nanotubes ◽  
Hydroxyl Groups ◽  
Simple Method ◽  
Pyrrole Derivatives ◽  
Ft Ir ◽  
Fourier Transforms Infrared Spectroscopy

In this study, halloysite nanotubes (HNTs) as a green and available nano-mineral were used. The hydroxyl groups of HNTs were increased by acid treatment. So, the efficiency of HNTs was improved. The catalyst application of acid treatment HNTs was investigated in the synthesis of pyrrole as an important heterocycle compound. The catalyst was characterized by Fourier transforms infrared spectroscopy (FT-IR). Easy and simple method, high efficiency and eco-friendly are the advantages of this report.

Anisotropic acoustic phonon polariton-enhanced infrared spectroscopy for single molecule detection

Nanoscale ◽  
2021 ◽  
Author(s):  
wei Lv ◽  
hanchao Teng ◽  
chenchen Wu ◽  
Xiaotao Zhang ◽  
Xiangdong Guo ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Single Molecule ◽  
Scanning Probe Microscopy ◽  
Acoustic Phonon ◽  
Fourier Transforms ◽  
High Spatial Resolution ◽  
Scanning Probe ◽  
Surface Species ◽  
Composition And Structure ◽  
Fourier Transforms Infrared Spectroscopy

Nanoscale Fourier transforms infrared spectroscopy (nano-FTIR) based on scanning probe microscopy enables identification of chemical composition and structure of surface species with a high spatial resolution (~10 nm), which is...

Characterization and Evaluation of Ca/Al LDHs Adsorbents Synthesized by a One-Step Hydrothermal Method for Congo Red Removal

2020 ◽  
Vol 977 ◽  
pp. 195-200
Author(s):  
Hong Tham Thi Nguyen ◽  
Dao Thi To Uyen ◽  
Duy Chinh Nguyen ◽  
Van Thuan Tran ◽  
Tri Duc Lam ◽  
...  
Keyword(s):  
Congo Red ◽  
Fourier Transforms ◽  
X Ray Diffraction ◽  
Anionic Dyes ◽  
One Step ◽  
Ft Ir ◽  
Fourier Transforms Infrared Spectroscopy ◽  
Hydrothermal Approach ◽  
Double Hydroxide ◽  
Hydrolysis Of

We investigated the fabrication of Ca/Al layered double hydroxide (LDHs) via a one-step hydrothermal approach with slow hydrolysis of urea at a low temperature without further annealing required. The as-synthesized Ca/Al LDHs nanostructures obtained were defined using Fourier transforms infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), powder X-ray diffraction (XRD), and scanning electron microscopy (SEM). The results demonstrated that Ca/Al LDHs exhibit excellent adsorption performance on Congo red anionic dyes in aqueous solution. The adsorption capacity of the Ca/Al LDHs toward Congo red was found to be 59.41 mg/g.

scholarly journals Study of the Biodegradation of PLA/PBAT Films after Biodegradation Tests in Soil and the Aqueous Medium

2021 ◽  
Vol 12 (1) ◽  
pp. 833-846
Keyword(s):  
Contact Angle ◽  
Aqueous Medium ◽  
Visual Analysis ◽  
Fourier Transforms ◽  
Scanning Calorimetry ◽  
Thermal Compression ◽  
Hydrophilic Character ◽  
Ft Ir ◽  
Fourier Transforms Infrared Spectroscopy ◽  
Biodegradation In Soil

The intense consumption of conventional plastics has been generating a series of problems for nature due to the accumulation of municipal solid waste because of its difficult degradation. Therefore, the use of biodegradable polymers becomes a good option to minimize these effects. Poly (lactide acid)/poly(butylene adipate-co-terephthalate) (PLA/PBAT) is a biodegradable blend that can be used mainly in applications that have a short shelf life. So, it is important to know the total biodegradation time of this blend. For this reason, PLA/PBAT films (1.5 x 1.5 x 0.15 cm) were produced by thermal compression molding to be subjected to biodegradation tests in soil and aqueous medium for 180 days. The films were characterized by visual analysis, weight loss measurements, differential scanning calorimetry (DSC), Fourier transforms infrared spectroscopy (FT-IR), contact angle, and scanning electron microscopy (SEM). DSC showed an increase of 0.7% in PLA crystallinity subjected to the aqueous medium, while FT-IR showed a reduction in the bands at 1710 cm-1 and 1100 cm-1, as a result of hydrolysis for both methodologies. The blend's hydrophilic character was increased after both degradation processes, presenting a reduction of 34.5% in the contact angle after biodegradation in soil. From the results, it was possible to conclude that PLA/PBAT films did not degrade completely, as expected, but showed signs that indicated the beginning of the degradation. The degradation was more effective in the aqueous medium.

scholarly journals Role of Zingiber Officinale Essential Oil- Chitosan Based Biopolymer Film For Bioactive Packaging

2021 ◽  
Author(s):  
Sawsan A. Al-Hilifi ◽  
Rawdah M. Al-Ali
Keyword(s):  
Essential Oil ◽  
Food Packaging ◽  
Fourier Transforms ◽  
Zingiber Officinale ◽  
Differential Scanning Calorimetric ◽  
Hydroxyl Groups ◽  
X Ray Diffraction ◽  
Ft Ir ◽  
Biopolymer Film

Abstract The recent interest in bio-packing at field of food become trending in the development of antimicrobial coatings. The focus of this study was to assess the potential application of zingiber officinale essential oil (GEO) in chitosan films (CHf). The data indicated that there were significant differences(p < 0.05) in the chemical composition of the samples.Forty-seven active compounds of the essential oil were identified from the rhizomes of ginger, which were identified byGC-MS. Fourier transforms infrared spectra (FT-IR) confirmed that an interaction between the hydroxyl groups of the phenolic compounds of the essential oil and the amide groups of polymer matrix. As shown the appearance of peaks at wavenumbers 1639cm-1 and 1558cm-1 Furthermore, X-ray diffraction results suggested a lower crystallintiyin CHf due to GEO effect. Differential Scanning Calorimetric (DSC) analysis revealed that CHf possessed high thermal stability, especially when different concentrations of GEO added. The bioactive CHf showed distinct activity against both positive and negative gram bacteria. They are Staphylococcus aurous, Bacillus subtillis, Streptococcus Sp. Escherichia coli, Salmonella Sp. Pseudomonas erugiosa. This results provides a comprehensive insight on the importance of films incorporated with EOs of interest in food packaging.

Preparation and application of Fe3O4@Acetamidoxanthate as a unique nanosorbent in heavy metal removing

2021 ◽  
pp. 1-11
Author(s):  
Mohammad Moein Mohareri ◽  
Mehdi Ghaffari ◽  
Elham Sattarzadeh ◽  
Saeed Kakaei
Keyword(s):  
Heavy Metals ◽  
Chelating Agents ◽  
High Efficiency ◽  
Fourier Transforms ◽  
Metal Extraction ◽  
Removal Of Heavy Metals ◽  
Ft Ir ◽  
Temperature Time ◽  
Widespread Interest ◽  
Nano Adsorbent

Chelating agents are one of the most important substances in metal extraction, but separation is the main problem in the use of these agents as an adsorbent. After the adsorption of metals by an external magnet, magnetic NPs provide the possibility of easy collecting and isolating the adsorbent nanomaterial for many applications. Given the immense importance of magnetic NPs, there has been widespread interest in accessing the above adsorbent. In the present study, an attempt was made to synthesize acetamido xanthate which was coupled to NPs and has the potential to be used as a nano-adsorbent for the removal of heavy metals. This novel nano sorbent was characterized by scanning electron microscopy (SEM), Fourier transforms infrared (FT-IR), and Nuclear Magnetic Resonance (NMR) spectroscopy. The effect of some parameters such as temperature, time, pH, and the amount of adsorbent on the extraction reaction was investigated. The optimized condition for extraction of cerium was temperature of 30°C, pH = 8, reaction time of 45 minutes using 7.5 mg of the prepared nanosorbent, that in such condition the yield of reaction achieved up to 97%. The prepared adsorbent showed high efficiency in the adsorption of heavy metals specifically.

Anodisation Time-Related Nanocrystallite Size of Porous Silicon Template Studied by Raman Spectroscopy, Photoluminescence and Fourier Transforms Infrared Spectroscopy

2013 ◽  
Vol 686 ◽  
pp. 56-64
Author(s):  
N.A. Asli ◽  
Mohamad Rusop ◽  
Saifollah Abdullah
Keyword(s):  
Raman Spectroscopy ◽  
Infrared Spectroscopy ◽  
Porous Silicon ◽  
Fourier Transforms ◽  
Crystalline Silicon ◽  
Electrochemical Anodization ◽  
Etching Time ◽  
Nanocrystallite Size ◽  
Peak Broadening ◽  
Fourier Transforms Infrared Spectroscopy

Nanostructured Porous Silicon templates (NPSiT) were prepared by photo-electrochemical anodization of p-type crystalline silicon in HF electrolyte at different etching time. Five samples were prepared with etching time varied from 10 to 50 minutes at 20 mA/cm2 of current density. The effects of etching time on NPSiT were observed based on nanocrystallite size, photon energy and surface distribution. These studied was demonstrated by Raman spectroscopy, photoluminescence (PL) and Fourier transforms infrared spectroscopy (FTIR). It was found that NPSiT sample with large pore diameter, which is smaller nanocrystallites size of Si between pore. The optical properties of NPSiT were investigated by photoluminescence (PL) and PL peak broadening and shifting towards higher energy can be observed with increasing etching time. The optimum etching time with respect to PL intensity was obtained at 30 minutes, for which uniform pores and a shift of the PL maximum to a higher energy of 1.9 eV is observed.

scholarly journals Halloysite Nanotubes Modified by Chitosan as an Efficient and Eco-Friendly Heterogeneous Nanocatalyst for the Synthesis of Heterocyclic Compounds

Proceedings ◽  
2019 ◽  
Vol 41 (1) ◽  
pp. 59
Author(s):  
Diana Fallah Jelodar ◽  
Zoleikha Hajizadeh ◽  
Ali Maleki
Keyword(s):  
Fourier Transform ◽  
Ir Spectroscopy ◽  
Heterocyclic Compounds ◽  
High Efficiency ◽  
Halloysite Nanotubes ◽  
Reaction Conditions ◽  
X Ray ◽  
Recoverable Catalyst ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

In this study, halloysite nanotubes (HNTs) are modified by chitosan as a natural cationic amino polysaccharide. Halloysite nanotubes/chitosan (HNTs/Chit) were characterized by Fourier transform infrared (FT-IR) spectroscopy and energy dispersive X-ray (EDX) analysis. Also, its performance as a heterogeneous catalyst was investigated in the synthesis of pyranopyrazole derivatives. Being a reusable and easily recoverable catalyst, eco-friendliness, high efficiency, and mild reaction conditions are some advantages of the present work.

scholarly journals Polydimethylsiloxane and Castor Oil Comodified Waterborne Polyurethane

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Xuan Ji ◽  
Yanming Zhou ◽  
Baoling Zhang ◽  
Caiying Hou ◽  
Guozhang Ma
Keyword(s):  
Thermal Stability ◽  
Castor Oil ◽  
Water Resistance ◽  
Fourier Transforms ◽  
Protective Coatings ◽  
Average Particle Size ◽  
Waterborne Polyurethane ◽  
Average Particle ◽  
Ft Ir ◽  
Fourier Transforms Infrared Spectroscopy

In view of both improving properties of waterborne polyurethane (WPU) and sufficient utilization of renewable resources, a series of polydimethylsiloxane (PDMS) and castor oil (C.O.) comodified anionic WPUs with internal cross-linking was prepared through a prepolymer mixing process. The chemical structure of synthesized polymers was characterized by Fourier transforms infrared spectroscopy (FT-IR). In comparison with traditional linear WPU synthesized from petroleum-based polyols, these novel WPU films exhibited superior properties in solvent and water resistance, thermal stability, and mechanical strength, which suggest promising applications of these new environmentally friendly materials, particularly in the area of decorative and protective coatings. In addition, the results showed that with the increase in PDMS content in these co-modified WPUs the average particle size, the water resistance, and the thermal stability increased accordingly while the solvent resistance and the mechanical properties decreased.

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