Synthesis and characterization of poly(N-isopropylmethacrylamide-co-acrylic acid) microgels for in situ fabrication and stabilization of silver nanoparticles for catalytic reduction of o-nitroaniline in aqueous medium

2018 ◽  
Vol 132 ◽  
pp. 89-97 ◽  
Author(s):  
Robina Begum ◽  
Jawayria Najeeb ◽  
Ghazia Ahmad ◽  
Weitai Wu ◽  
Ahmad Irfan ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Acrylic Acid ◽  
Aqueous Medium ◽  
Catalytic Reduction ◽  
Synthesis And Characterization ◽  
In Situ Fabrication

Synthesis and characterization of composite polysulfone membranes for desalination in nanofiltration technique

2010 ◽  
Vol 62 (11) ◽  
pp. 2655-2663 ◽  
Author(s):  
A. Akbari ◽  
M. Homayonfal ◽  
V. Jabbari
Keyword(s):  
Acrylic Acid ◽  
Polyacrylic Acid ◽  
Graft Polymerization ◽  
Irradiation Time ◽  
Polymerization Process ◽  
Synthesis And Characterization ◽  
Porous Support ◽  
Ft Ir

Composite nanofiltration (NF) membrane was developed polyacrylic acid (PAA) in situ UV graft polymerization process using ultrafiltration (UF) polysulfone (PSF) membrane as porous support. FT-IR spectra indicated that grafting was performed and it show peaks at 1,732 cm−1 and 3,396 cm−1 region for CO and OH starching bond of acrylic acid (AA) monomer, respectively. AFM microscopy showed the roughness of surface was reduced by increase of UV irradiation times. Effect of irradiation time on the grafting of acrylic acid (AA) in the same concentration was discussed. The salts rejection increase was accompanied with grafting of polysulfone (PSF) ultrafiltration (UF) membrane. The rejection of Na2SO4, MgSO4, NaCl and CaCl2 salts by PSF-grafted-PAA nanofiltration (NF) membrane was in 98, 60, 52 and 30% respectively, under 0.3 MPa.

Synthesis and Characterization of Nanoscale CeO2 Catalyst for deNOx

2005 ◽  
Vol 23 ◽  
pp. 95-98 ◽  
Author(s):  
S. Kawi ◽  
Y.P. Tang ◽  
K. Hidajat ◽  
L.E. Yu
Keyword(s):  
Water Vapor ◽  
Catalytic Reduction ◽  
Precipitation Method ◽  
Synthesis And Characterization ◽  
In Situ Xrd ◽  
Surface Areas ◽  
Rich Condition ◽  
The One

Hydrothermal and precipitation methods have been applied to synthesize nanoscale CeO2 catalysts for selective catalytic reduction of NO with hydrocarbon under oxygen-rich condition. The former procedure has the advantage of enhancing the hydrothermal stability of nanomaterial. BET results show that their surface areas are about 30-80 m2/g. Based on TEM results, hydrothermally prepared CeO2 shows very uniform grain shaped particles with size around 10-20 nanometers. Its thermal stability up to 1200°C has been confirmed by in-situ XRD. Furthermore, deNOx reaction with propene as reducing agent in the presence of 5% oxygen has been carried out to compare catalysts prepared by the above two methods. Results show that hydrothermally prepared catalyst is more active than the one prepared by precipitation method. The latter one lost half of its activity in the presence of 5% water vapor, while the former one could stand up to 10% water vapor in the gas mixture without losing much activity.

Synthesis and characterization of inorganic-organic polymer microgels for catalytic reduction of 4-nitroaniline in aqueous medium

2016 ◽  
Vol 39 (3) ◽  
pp. 645-653 ◽  
Author(s):  
Zahoor Hussain Farooqi ◽  
Aysha Ijaz ◽  
Robina Begum ◽  
Khalida Naseem ◽  
Muhammad Usman ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
Catalytic Reduction ◽  
Organic Polymer ◽  
Synthesis And Characterization

Facile pH-Dependent Synthesis and Characterization of Catechol Stabilized Silver Nanoparticles for Catalytic Reduction of 4-Nitrophenol

2017 ◽  
Vol 147 (8) ◽  
pp. 2134-2143 ◽  
Author(s):  
Hailemariam Gebru ◽  
Saide Cui ◽  
Zhenjiang Li ◽  
Xin Wang ◽  
Xianfu Pan ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Catalytic Reduction ◽  
Synthesis And Characterization ◽  
Ph Dependent

Synthesis and characterization of thermoplastic starch/ PVA /cardanol oil composites loaded with in‐situ silver nanoparticles

2021 ◽  
pp. 51511
Author(s):  
Ramadan Yahia ◽  
Medhat E. Owda ◽  
Ragab E. Abou‐Zeid ◽  
Farag Abdelhai ◽  
Ehab S. Gad ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Thermoplastic Starch ◽  
Synthesis And Characterization

scholarly journals Synthesis, characterization and fabrication of copper nanoparticles in N-isopropylacrylamide based co-polymer microgels for degradation of p-nitrophenol

2015 ◽  
Vol 33 (1) ◽  
pp. 185-192 ◽  
Author(s):  
Zahoor H. Farooqi ◽  
Tanzila Sakhawat ◽  
Shanza Rauf Khan ◽  
Farah Kanwal ◽  
Muhammad Usman ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Aqueous Medium ◽  
Copper Nanoparticles ◽  
Catalytic Reduction ◽  
Copper Ions ◽  
Effect Of Temperature ◽  
Ft Ir ◽  
Catalyst Dosage ◽  
Hybrid Microgels

AbstractPoly(N-isopropylacrylamide-co-acrylic acid) [P(NIPAM-co-AAc)] microgels were synthesized by precipitation polymerization. Copper nanoparticles were successfully fabricated inside the microgels by in-situ reduction of copper ions in an aqueous medium. The microgels were characterized by Fourier Transform Infrared Spectroscopy (FT-IR) and Dynamic Light Scattering (DLS). Hydrodynamic radius of P(NIPAM-co-AAc) microgel particles increased with an increase in pH in aqueous medium at 25 °C. Copper-poly(N-isopropylacrylamide-co-acrylic acid) [Cu-P(NIPAM-co-AAc)] hybrid microgels were used as a catalyst for the reduction of 4-nitrophenol (4-NP). Effect of temperature, concentration of sodium borohydride (NaBH4) and catalyst dosage on the value of apparent rate constant (kapp) for catalytic reduction of 4-NP in the presence of Cu-P(NIPAM-co-AAc) hybrid microgels were investigated by UV-Vis spectrophotometry. It was found that the value of kapp for catalytic reduction of 4-NP in the presence of Cu-P(NIPAM-co-AAc) hybrid microgel catalyst increased with an increase in catalyst dosage, temperature and concentration of NaBH4 in aqueous medium. The results were discussed in terms of diffusion of reactants towards catalyst surface and swelling-deswelling of hybrid microgels.

Synthesis and Characterization of Silver Nanoplates by a Seed-mediated Method

2019 ◽  
Vol 29 (3) ◽  
Author(s):  
Mai Ngọc Tuan Anh
Keyword(s):  
Hydrogen Peroxide ◽  
Silver Nanoparticles ◽  
Ascorbic Acid ◽  
Silver Nitrate ◽  
Sodium Borohydride ◽  
Trisodium Citrate ◽  
Synthesis And Characterization ◽  
Silver Nanoplates ◽  
Seed Mediated

Silver nanoplates (SNPs) having different size were synthesized by a seed-mediated method. The seeds -silver nanoparticles with 4 – 6 nm diameters were synthesized first by reducing silver nitrate with sodium borohydride in the present of Trisodium Citrate and Hydrogen peroxide. Then these seeds were developed by continue reducing Ag\(^+\) ions with various amount of L-Ascorbic acid to form SNPs. Our analysis showed that the concentratrion of L-Ascorbic acid, a secondary reducing agent, played an important role to form SNPs. In addition, the size and in-plane dipole plasmon resonance wavelenght of silver nanoplates were increased when the concentration of added silver nitrate increased. The characterization of SNPs were studied by UV-Vis, FE-SEM, EDS and TEM methods.

Sign in / Sign up

Export Citation Format

Share Document