Efficient synthesis of palladium nanoparticles using guar gum as stabilizer and their applications as catalyst in reduction reactions and degradation of azo dyes

Abstract

<jats:title>Abstract</jats:title><jats:p>Palladium is very expensive metal and has numerous applications especially as a versatile hydrogenation and dehydrogenation catalyst for chemical reactions. The main hurdle in its wide use is the high materials cost. In the present study a cost effective palladium nano catalyst was prepared using the green method of synthesis with guar gum as capping and reducing agent. The formations of palladium nanoparticles were confirmed by UV-spectrophotometer while for morphology and nature, SEM and XRD were performed that confirmed the crystalline nature of PdNPs and proved the roughly spherical shape of nanoparticles. FT-IR analysis showed different functional groups of reducing agent and proved that guar gum have the ability to stabilized as well as to reduce the Pd (II) to Pd (0). Specific signal for the palladium is present in EDX spectra that further confirmed the formation of PdNPs. The catalytic efficiency was studied using the hydrogenation of 4-nitrophenol. Rate constant of prepared nano-catalyst was 0.1436/min, its efficiency, TON, TOF, in above mention reaction is 90.83, 27.78, and 185.2/hrs, respectively. Data obtained proved synthesized PdNPs to be efficient heterogeneous catalyst for the reduction of 4-NP and for the degradation of azo dyes.</jats:p>

Photocatalytic degradation of organic dyes: Pd-γ-Al2O3 and PdO-γ-Al2O3 as potential photocatalysts

“…In addition, Pd NPs were fabricated via ultrasonication of Andean blackberry leaf extract and were used for photocatalytic degradation of methylene blue. 23 Rao et al 24 reported enhanced photocatalytic degradation of bisphenol A by Pd/PdO/β-Bi 2 O 3 microspheres and M. A. Khan's research team 25 used guar gum as stabilizer to synthesize Pd NPs and applied the Pd NPs as catalysts for the degradation of azo dyes. However, these methods are complicated and difficult for synthesizing Pd NPs and some require sophisticated equipment.…”

Feasibility of lime and biopolymer treatment for soft clay improvement: a comparative and complementary approach

“…The peaks at 2026 and 2121 cm -1 are assigned to weakly bonded water molecules (O-H, H-O-H), while that at 1640 cm -1 can be linked to the H-O-H weakly bonded water molecules . The peak at 1014 cm -1 can be directly assigned to the C-O bond of carbonyl and carboxylate in GG (Anjum et al 2020). The peak at 1375 cm -1 can be associated with C-H bending of aldehyde.…”

“…The peak at 3690 cm -1 is assigned to the strongly bonded water molecules (H-O-H) due to the hydroxylation of the GG to produce hydro-gels. Moreover, the peak at 1002 cm -1 is directly linked to the C-O bonds of the carbonyl and carboxylate groups, which occur in GG (Anjum et al 2020). These nuances provide evidence of gelation in the GG-stabilized soil.…”

Palladium Nanoparticles Functionalized with PVP-Quercetin Inhibits Cell Proliferation and Activates Apoptosis in Colorectal Cancer Cells

“…This characteristic is important since it shows their reactivity in an environment that surrounds them. PdNPs works as an electron acceptor in the presence of H 2 in a catalytic reaction [64]. These reaction mechanisms could be involved in the toxicity mechanisms with different cell types.…”