Synthesis, characterization, and catalytic activity for hybrids of multi-walled carbon nanotube and amphiphilic poly(propyleneimine) dendrimer immobilized with silver and palladium nanoparticle

Murugan, Eagambaram; Vimala, G.

doi:10.1016/j.jcis.2012.12.074

Cited by 30 publications

(17 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Table 2 also summarizes the catalytic performance of several bimetallic systems along with some other monometallic catalysts reported in the literature for the catalytic reduction of 4-nitrophenol to 4-aminophenol. It is clear that our CuPd/MgO outperforms several catalysts and is highly competitive with some monometallic noble metal catalysts such as monometallic Pd [43] or Au [16]. The comparison with other CuPd bimetallic systems reported in literature [14,35,36] indicates that a support such as our MgO is very suitable to enhance the catalytic activity.…”

Section: Catalytic Testsmentioning

confidence: 61%

CuPd Bimetallic Nanoparticles Supported on Magnesium Oxide as an Active and Stable Catalyst for the Reduction of 4-Nitrophenol to 4-Aminophenol

Morales¹

2018

Int. J. Green Technol.

View full text Add to dashboard Cite

Abstract:In this work, we report the synthesis and characterization of a catalyst based on bimetallic CuPd nanostructures generated over a magnesium oxide support. Its catalytic activity and reusability have been tested in the reduction of 4-nitrophenol as a model reaction using NaBH4 as the source of hydrogen for the reduction of the nitro-group. The structure, composition and morphology of the catalysts were studied by N2 physisorption, X-ray diffraction (XRD), Transmission Electron Microscopy (TEM) and X-ray Photoelectron Spectroscopy (XPS). The reaction kinetics of reduction of 4-nitrophenol to 4-aminophenol has been followed by UV-visible spectrophotometry, and its apparent rate constant has been determined and compared with its monometallic counterparts. All the tested catalysts exhibited remarkable high activity and excellent stability upon reuse for multiple consecutive cycles. We found out that a small loading addition of Pd to Cu catalyst greatly improved the catalytic activity in comparison with the monometallic samples. Our characterization results pointed out a higher metallic dispersion degree as the main explanation for this enhanced performance. CuPd/MgO is highly competitive or outperforms the catalytic activity of other bimetallic systems reported in literature.

show abstract

Section: Catalytic Testsmentioning

confidence: 61%

CuPd Bimetallic Nanoparticles Supported on Magnesium Oxide as an Active and Stable Catalyst for the Reduction of 4-Nitrophenol to 4-Aminophenol

Morales¹

2018

Int. J. Green Technol.

View full text Add to dashboard Cite

show abstract

“…32 The functionalization of PAC onto PS-PVBC matrix was established from the appearance of C= 0 (str) and C-N + (str) peaks at 1710 and 1121 cm −1 (figure 1b), respectively. Similarly, the formation/immobilization of AgNPs, AuNPs and PdNPs onto the respective matrices was also ascertained from FT-IR results.…”

Section: Characterization Of Ps-pvbc-g-pac-agnps Ps-pvbc-g-pac-aunpsmentioning

confidence: 99%

Efficient functionalization of poly(styrene) beads immobilized metal nanoparticle catalysts for the reduction of crystal violet

Murugan

Shanmugam

2015

Bull Mater Sci

View full text Add to dashboard Cite

Three types of new bead-shaped heterogeneous nanoparticle (NP) catalysts were synthesized by simplified procedures and studied for continuous reduction of crystal violet (CV) dye. The stabilizing agent, viz., 2-acryloxyethyltrimethyl ammonium chloride (PAC) was functionalized efficiently onto the surface of insoluble poly(styrene)-co-(vinyl benzyl chloride) beads (PS-PVBC) through surface-initiated atom transfer radical polymerization (SI-ATRP) to obtain insoluble bead matrix having intense surface functional groups labelled as PS-PVBC-g-PAC. These PS-PVBC-PAC beads in turn were used as a common matrix for individual immobilization of AgNPs, AuNPs and PdNPs by following the simple chemical reaction/reduction methods to yield the corresponding bead-shaped heterogeneous NP catalysts, viz., PS-PVBC-g-PAC-AgNPs, PS-PVBC-g-PAC-AuNPs and PS-PVBC-g-PAC-PdNPs. These catalysts were characterized by UV-Vis, FT-IR, SEM/EDAX and HRTEM techniques. The catalytic activity of these three types of catalysts were examined through the reduction of CV using NaBH 4 as a reducing agent and it was observed that all these catalysts effectively accelerated the reaction. The superior catalyst, viz., PS-PVBC-g-PAC-AuNPs was again used for detail kinetic studies of the same reduction reaction.

show abstract

“…One of the specific properties of PAMAM dendrimer is their ability to encapsulate organic compounds like phenol to remove from solutions. This attribution has been primarily exploited in the synthesis of metal nanoparticles; and dendrimerbased encapsulation or dendrimer-based hybrids (nanohybrids) have gained great interests [9,[15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Application of dendrimer/titania nanohybrid for the removal of phenol from contaminated wastewater

Hayati

Arami

Maleki

et al. 2016

Desalination and Water Treatment

View full text Add to dashboard Cite

In this study, polyamidoamine dendrimer of generation 4 was successfully immobilized on titania nanoparticles to synthesize a new nanohybrid (Den/TiO 2 ) with the capability of encapsulation for phenol removal from the polluted effluents. Characterizations of the adsorbent using SEM, TEM, XRD, and FTIR analyses indicated the successful immobilization of dendrimers onto the surface of titania. The effect of important parameters on removal efficiency such as retention time, pH, phenol concentration, Den/TiO 2 dosage, and temperature was investigated. The isotherm, kinetic, and thermodynamic parameters of the removal process were demonstrated, and the experimental data followed the Langmuir and pseudo-second-order model with high correlation coefficients. The calculated thermodynamic parameters showed that the removal of phenol using Den/TiO 2 was an endothermic and spontaneous process. The obtained results indicate that the prepared nanohybrid can be effectively used for the removal of phenol from industrial wastewaters.

show abstract

Synthesis, characterization, and catalytic activity for hybrids of multi-walled carbon nanotube and amphiphilic poly(propyleneimine) dendrimer immobilized with silver and palladium nanoparticle

Cited by 30 publications

References 63 publications

CuPd Bimetallic Nanoparticles Supported on Magnesium Oxide as an Active and Stable Catalyst for the Reduction of 4-Nitrophenol to 4-Aminophenol

CuPd Bimetallic Nanoparticles Supported on Magnesium Oxide as an Active and Stable Catalyst for the Reduction of 4-Nitrophenol to 4-Aminophenol

Efficient functionalization of poly(styrene) beads immobilized metal nanoparticle catalysts for the reduction of crystal violet

Application of dendrimer/titania nanohybrid for the removal of phenol from contaminated wastewater

Contact Info

Product

Resources

About