Preparation of divalent Pd(II) species on sepiolite and its catalysis of olefin dimerizations

Kaneda, Kiyotomi; Kiriyama, T; Hiraoka, Tadashi; Imanaka, Toshinobu

doi:10.1016/0304-5102(88)85017-x

Cited by 20 publications

(2 citation statements)

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“…PdCl 2 and Pd(CH 3 − COO) 2 having 337.8 eV and 338.4 eV for Pd 3d 5/2 peak, respectively . Further, the peak at 336.5 eV may also be due to monovalent palladium (Pd 1+ ) species that might have formed during the process of reduction of divalent palladium . Thus, from XPS results it can be concluded that the removal of palladium using TLS biosorbent follows the sorption–reduction pathway.…”

Section: Resultsmentioning

confidence: 96%

“…51 Further, the peak at 336.5 eV may also be due to monovalent palladium (Pd 1+ ) species that might have formed during the process of reduction of divalent palladium. 52 Thus, from XPS results it can be concluded that the removal of palladium using TLS biosorbent follows the sorption-reduction pathway. The L. speciosa leaves contain many effective anti-diabetic components 19 such as corosolic acid or 2 -hydroxyursoloic acid (triterpenoid), lagerstroemin (ellagitannin), and penta-O-galloyl-D-glucopyranose (PGG, gallotannins) with lots of free primary -OH groups.…”

Section: Characterization Of Tls Biosorbentmentioning

confidence: 94%

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Recovery of palladium from secondary waste using soluble tannins cross-linkedLagerstroemia speciosaleaves powder

Choudhary

Paul

Borse

et al. 2017

J. Chem. Technol. Biotechnol

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BACKGROUND Naturally available biomass can be explored as a potential sorbent for recovery of precious metals. This work evaluates the sorption potential of a biosorbent developed by host soluble tannins cross‐linked Lagerstroemia speciosa leaves powder (TLS) for Pd recovery from secondary waste. RESULTS Batch experiments suggest 95% Pd(II) sorption by TLS is achieved over a pH range of 1–6 with a maximum of 99% at pH 2. The experimental data for Pd(II) sorption onto TLS is well explained by pseudo‐second‐order kinetics and the Langmuir isotherm model with a monolayer sorption capacity of 46.3 mg g−1. Thermodynamic variables indicate that Pd(II) sorption onto TLS is spontaneous, endothermic, and physical in nature. TLS biosorbent was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, and X‐ray photoelectron spectroscopy (XPS). XPS results reveal the presence of zero‐valent Pd and mono or divalent Pd species on the TLS surface, which conclude that Pd(II) removal is governed by a sorption‐reduction mechanism. CONCLUSIONS The TLS is effective in Pd(II) recovery from an acid‐leached solution of monolithic ceramic capacitors (A‐MLCC) and simulated spent automobile catalyst (A‐SSAC), which suggests that this biosorbent can be used as a promising material in biotechnological processes for recovery of precious metals from secondary waste. © 2016 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 96%

Section: Characterization Of Tls Biosorbentmentioning

confidence: 94%