JOURNAL OF APPLIED CHEMICAL RESEARCH
Year:2018 | Volume:12 | Issue:2|Papers Count:8

Copper oxide nanoparticles were synthesized using black tea extract and copper nitrate as thecopper source by the green method at different calcination temperatures. This method has manyadvantages such as nontoxic, economic viability, ease to scale up, less time consuming andenvironmental friendly approach for the synthesis of CuO nanoparticles without using any organicchemicals. The synthesized CuO nanoparticles were characterized by powder X-ray diffraction(XRD), scanning electron microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). The average crystallite size of CuO nanoparticles was calculated using Scherrer formula. The Xraypowder diffraction (XRD) analysis revealed the formation of monoclinic phase CuO withaverage particle size of 22-39 nm.

SBA-15 grafted with N-(4-(trimethylsilyl) butyl)-9H-fluorene-9-amine was synthesized by a simplestrategy and applied to removal of Acid Red 33 and Acid Black 194 from aqueous solutions. SBA-15 was synthesized and Functionalized according to procedure in the literature. Fluorenefunctionalized SBA-15 was showed the BET surface area 200 m2g-1 and pore diameter 4. 2 nm, based on adsorption-desorption of N2 at 77 K. The presence of organic groups in the silicaframework was demonstrated by FTIR and Raman spectrum. The effects of pH, amount ofadsorbent, contact time and dye concentration on adsorption were determined in order to find theoptimum adsorption conditions. The data fitted well to the Langmuir model with maximumadsorption capacities 500. 0 mg/g for Acid Red 33 and 110. 0 mg/g for Acid Black 194. The resultswere shown that this methodology could be suitable for the removal of the pollutant acid dyes fromdyeing wastewater of handmade carpet’ s fibers.

In recent years, metal nano particles such as silver, copper and zinc have developed in textilefinishing. Copper nano particles are used in wound dressings and socks to give them antibacterialproperties. In the present paper, cotton fabrics were treated with different concentrations of Cu nanoparticles colloidal solution. For investigation of the durability of nano particles on cotton fabric, laundering test was carried out. Antibacterial activity, wetting time, bending length, crease recoveryangle and whiteness were investigated. Cu ions contents on cotton fabric were determined usingatomic absorption spectroscopy and the chemical bonding was detected using the FTIR/ATRspectroscopy. The scanning electron microcopy was used for surface morphology studies. Theresults showed that increase of copper nano particles concentration increased antibacterial activity, and after repeated laundering, some of copper nano particles were removed from the fabric so thatbacteria reduction reached to 92 %. Whiteness decreased by Cu nano particles coating. Increase ofcopper nano particles concentration increased crease recovery angle, bending length, wetting time. Atomic absorption analysis showed the decrease of copper ion content after repeated laundering.

A novel Brø nsted acidic ionic liquid namely N1, N1, N2, N2-tetramethyl-N1, N2-bis(sulfo)ethane-1, 2-diaminium trifluoroacetate {[TMBSED][TFA]2} was synthesized, and characterized by studying its1H NMR, 13C NMR, 19F NMR and mass spectral data. Afterward, the ionic liquid was applied ascatalyst for the production of polyhydroquinoline derivatives via the one-pot multi-componentreaction of arylaldehydes with dimedone, β-ketoesters and ammonium acetate under solvent-freeconditions. The protocol had several advantages, which include: (i) efficiency, (ii) generality, (iii)excellent yields of the products, (iv) short reaction times, (v) clean reaction profile, (vi) simplicity, (vii) usage of a few amount of the catalyst, (viii) easy preparation the catalyst from available andinexpensive starting materials, (ix) mild reaction conditions, (x) performing the reaction in solventfreeconditions, and (xi) easy work-up.

The reaction of nano-cellulose and antimony pentachloride in dichloromethane gave nano-cellulose-SbCl5. Also nano-cellulose-SbCl5 has been characterized by energy dispersive X-ray spectroscopy(EDX), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). Nano-cellulose-SbCl5has been applied as a nano-catalyst for synthesis of pyrano [2, 3-d]pyrimidines from the simple one-pot reaction between aryl aldehydes, barbituric acid orthiobarbituric acid and malononitril. Cleanliness, simple methodology, short time, and excellentyields of products are some advantages of this method.

In this paper, the silicon-containing sulfonated polystyrene/acrylate– ionic liquid (Si-SPS/A– IL)hybrid membranes was prepared to obtain the proton exchange membrane (PEM) materials withhigh methanol barrier and good selectivity. The Si-SPS/A– IL hybrid membranes characterized asthe function of IL to evaluate their potential as PEMs in direct methanol fuel cells (DMFCs). Fourdifferent Hybrid material with different properties have been synthesized and named from I toIV. The potential of the membranes in direct methanol fuel cells (DMFCs) is characterizedpreliminarily by studying their thermal stability, ion-exchange capacity, water uptake, methanoldiffusion coefficient, proton conductivity and selectivity (proton conductivity/methanol diffusioncoefficient). All the hybrid membranes exhibit good thermal stability and reasonable water uptake. IV and V membranes have a low methanol diffusion coefficient, while II and III membrane havegood proton conductivity. In addition, the selectivity values of hybrid membranes increase withincreasing IL content and V membrane shows the best selectivity (1. 14×105Ss cm− 3). These resultssuggest that the Si-SPS/A– IL hybrid membranes are possible candidate materials for PEMs inDMFC applications.

A green and efficient ionic liquid-based ultrasound-assisted in-situ solvent formationmicroextraction (IL-UA-ISFME) in combination with high-performance liquid chromatographyultravioletdetection (HPLC-UV) has been successfully developed for the trace determination offive selected polycyclic aromatic hydrocarbons (PAHs) in environmental water samples. In thismethod, a hydrophobic ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate) wasformed by addition of a hydrophilic ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate) tosample solution containing an ion-pairing agent (NaPF6). The analytes were extracted into the ionicliquid phase while the microextraction solvent was dispersed through the sample by utilizingultrasonic radiation. The sample was then centrifuged and extracting phase retracted into themicrosyringe, diluted with acetonitrile, and injected to HPLC. In the beginning, effectiveparameters controlling the performance of the microextraction process were studied in detail andoptimized. The limit of detections (LOD, S/N = 3) were in the range of 0. 32-0. 79 μ g L-1 while theRSD% values were below than 5. 2% (n = 6). A good linearity (0. 997 ≥ r2 ≥ 0. 992) and a broadlinear over the concentration ranges from 1 to 500 μ g L-1 were achieved. The method wasultimately applied for the preconcentration and sensitive determination of the PAHs in severalenvironmental water samples. The accuracy of the method in the real samples was tested by the relative recovery experiments with results ranging from 90-106%, which confirmed thatcomplicated matrixes had almost little effect on the developed analytical procedure.

A convenient synthetic route for the synthesis of biologically active functionalized piperidines usingZn(OAc)2. 2H2O as a highly efficient catalyst via five-component reaction of aromatic aldehydes, anilines and β-ketoesters at ambient temperature has studied. Mild reaction conditions, simplicity ofoperation and work-up procedures with no necessity of chromatographic purification steps, theavailability and easy to handle of this solid catalyst and good to high yields are the notable benefitsfor the highly efficient synthesis of these products.