Novel poly(aniline-co-3-amino-4-methoxybenzoic acid) copolymer for the separation and recovery of Pd(<scp>ii</scp>) from the leaching liquor of automotive catalysts

Zhong, Lijiang; Zhang, Jinyan; Zhang, Qin; Chen, Muhan; Huang, Zhangjie

doi:10.1039/c7ra06404g

Cited by 23 publications

(6 citation statements)

References 57 publications

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“…Based on the principle of the minimum charge density, the charge density of Pd(CN) 4 2− is less than those of Co(CN) 6 3− and Fe(CN) 6 3− . Fewer water molecules are required to stabilize Pd(CN) 4 2− compared to multivalent anions in the aqueous solution [ 59 , 60 ]. Pd(CN) 4 2− possibly exhibited higher affinity for hydrophobic quaternary ammonium compared to Co(CN) 6 3− or Fe(CN) 6 3− .…”

Section: Resultsmentioning

confidence: 99%

Highly Effective Removal of Metal Cyanide Complexes and Recovery of Palladium Using Quaternary-Ammonium-Functionalized MOFs

et al. 2018

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In this study, quaternary-ammonium-functionalized metal–organic frameworks (MOFs) Et-N-Cu(BDC-NH2)(DMF), were prepared, characterized, and applied for the highly effective removal of metal cyanide complexes, including Pd(CN)42−, Co(CN)63−, and Fe(CN)63−. Batch studies were carried out, and the maximum adsorption capacities of Pd(II), Co(III), and Fe(III) reached 172.9, 101.0, and 102.6, respectively. Adsorption was rapid, and equilibrium was established within 30 min. Et-N-Cu(BDC-NH2)(DMF) exhibited high thermal and chemical stability. Furthermore, absorbed Pd(CN)42− was selectively recovered by two-step elution. First, Co(CN)63− and Fe(CN)63− were eluted with a 1.5 mol L−1 KCl solution. Elution rates of Co(CN)63− and Fe(CN)63− were greater than 98.0%, whereas the elution percentage of Pd(CN)42− was less than 2.0%. Second, >97.0% Pd(CN)42− on the loaded MOFs was eluted using a 2.0 mol L−1 KI solution. The recovery rate of Pd(CN)42− was greater than 91.0% after five testing cycles. Adsorption isotherms, kinetics models, and adsorption thermodynamics of Pd(CN)42− on Et-N-Cu(BDC-NH2) (DMF) were also systematically investigated. The Et-N-Cu(BDC-NH2) (DMF) absorbent exhibited a rapid, excellent ability for the adsorption of metal cyanide complexes.

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Section: Resultsmentioning

confidence: 99%

Highly Effective Removal of Metal Cyanide Complexes and Recovery of Palladium Using Quaternary-Ammonium-Functionalized MOFs

et al. 2018

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“…A stock solution of 10.00 g·L –1 [PdCl 4 ] 2– was prepared following the literature. 44 Concentration of working of palladium solution can be obtained by diluting the standard stock solution.…”

Section: Methodsmentioning

confidence: 99%

“…The morphology and EDS analyses of palladium after deposition were carried out by SEM (Nova NanoSEM, Thermo Scientific, Waltham, USA), and the valence of palladium on the surface of coating was analyzed by XPS (K-Alpha + , Thermo USA) and HRTEM (JEM-210, JEOL, Tokyo, Japanese). 44 Concentration of working of palladium solution can be obtained by diluting the standard stock solution.…”

Section: Methodsmentioning

confidence: 99%

Recovery of Pd(II) from Hydrochloric Acid Medium by Solvent Extraction–Direct Electrodeposition Using Hydrophilic/Hydrophobic ILs

Shao

Jin

et al. 2020

ACS Omega

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Mixed [C 8 bet]Br/[C 4 mim][NTf 2 ] ionic liquids were used as a new extraction system to extract Pd(II) from multimetal-ion solutions. The separation factors K Pd/M (M: Cu, Fe, Ni, Zn, Co) are greater than 10 3 . Thiourea was found to be an effective stripping agent. After three cycles, the recovery efficiency was higher than 91.0%. Direct electrodeposition of palladium from the mixed ionic liquid phase was also studied. The Pd(II) complex in [C 8 bet]Br/[C 4 mim][NTf 2 ] system was studied by cyclic voltammetry at 348 K. The results indicate the existence of three types of Pd(II) complex in the [C 8 bet]Br/[C 4 mim][NTf 2 ] system, leading to three reductive waves. The reduction of Pd(II) to Pd(0) in this system is irreversible. A uniform black coating was obtained by constant-potential deposition at −1.7 V on a nickel foil, confirmed to be palladium metal by energy-dispersive spectrometry, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy analyses. After three cycles of continuous extraction–electrodeposition, over 90.0% of palladium was recovered.

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“…In addition, a new peak assigned to S-Pd bonds appeared at 162.44 eV [ 36 ]. The peaks at 337.43 eV and 342.67 eV were ascribed to the Pd-Cl bonds in PdCl 4 2− , and the doublet peaks (BE = 338.21 eV, 343.36 eV) likely corresponded to the binding energies of Pd-N or Pd-S bonds ( Figure 2 d) [ 37 , 38 , 39 ]. The XPS results further confirmed that DMTD was successfully grafted onto the PS-Cl and also indicated that Pd (II) coordinated with the N and S atoms in the PS-DMTD absorbent.…”

Section: Resultsmentioning

confidence: 99%

Selective Recovery of Palladium (II) from Metallurgical Wastewater Using Thiadiazole-Based Chloromethyl Polystyrene-Modified Adsorbent

Zhang

Chen

Wan

et al. 2022

IJMS

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Selective adsorption of palladium from metallurgical wastewater containing Pt (IV), Rh (III), Ca2+, Cu2+, Fe3+, Ni2+, Pb2+, V3+, and Ti4+ has tremendous economic and environmental benefits. In this paper, a novel thiadiazole-based chloromethyl polystyrene-modified adsorbent, viz. 2, 5-bis-polystyrene-1,3,4-thiadiazole (PS-DMTD), was synthesized using chloromethyl polystyrene as the backbone. The experimental results show that PS-DMTD can selectively separate Pd (II) from metallurgical wastewater in a one-step adsorption process. The calculated saturation adsorption capacity of PS-DMTD for Pd (II) was 176.3 mg/g at 25 °C. The separation factors of βPd (II)/Mn+ (Mn+: Pt (IV), Rh (III), Ca2+, Cu2+, Fe3+, Ni2+, Pb2+, V3+, and Ti4+) were all higher than 1 × 104. FT-IR, XPS, and single-crystal X-ray diffraction showed that the adsorption of Pd (II) to PS-DMTD was primarily through a coordination mechanism. Density functional theory (DFT) calculations revealed that the other base metal ions could not coordinate with the PS-DMTD. Pt (IV) could not be adsorbed to PS-DMTD due to its strong chlorophilicity. Furthermore, Rh (III) existed as a polyhydrate, which inhibited Rh (III) diffusion toward the positively charged absorption sites on the PS-DMTD. These results highlight that PS-DMTD has broad application prospects in the recovery of Pd (II) from metallurgical wastewater.

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Novel poly(aniline-co-3-amino-4-methoxybenzoic acid) copolymer for the separation and recovery of Pd(ii) from the leaching liquor of automotive catalysts

Abstract: The PANI–AMB copolymers were prepared and used for separation and recovery palladium from the leaching solutions of the automotive catalysts.

Cited by 23 publications

References 57 publications

Highly Effective Removal of Metal Cyanide Complexes and Recovery of Palladium Using Quaternary-Ammonium-Functionalized MOFs

Highly Effective Removal of Metal Cyanide Complexes and Recovery of Palladium Using Quaternary-Ammonium-Functionalized MOFs

Recovery of Pd(II) from Hydrochloric Acid Medium by Solvent Extraction–Direct Electrodeposition Using Hydrophilic/Hydrophobic ILs

Selective Recovery of Palladium (II) from Metallurgical Wastewater Using Thiadiazole-Based Chloromethyl Polystyrene-Modified Adsorbent

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