Highly efficient reduction of hexavalent chromium on amino-functionalized palladium nanowires

Wei, Lingling; Gu, Rui; Lee, Jongmin

doi:10.1016/j.apcatb.2015.03.056

Cited by 73 publications

(41 citation statements)

References 42 publications

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“…These findings may pave a way for the concise preparation of high performance and durability nano-hybrid catalysts for the pollutants elimination. Nanostructured Pd 0.14 µmol 1:2000 20 3 [5] Procyanidin-grafted eggshell membrane immobilized Pt NPs 140 µmol 1:1060 15 5 [4] amino-functionalized Pd nanowires 0.38 µmol 1:280 15 - [9] Polymer nanofibers immobilized Pd NPs 21.7 µmol 1:390 12 3 [11] Single crystalline Pd Tetrapods 0.38 µmol 1:280 5 - [12] Pd NPs 0.94 µmol 1:103 5 - [14] Biotemplate-supported Pd nanocatalysts 0.05 µmol 1:500 5 5 [16] amine-functionalized SiO2 support Pd NPs 1.98 µmol 1:225 2.5 5 [19] …”

Section: Discussionmentioning

confidence: 99%

Hydrophilic swellable metal–organic framework encapsulated Pd nanoparticles as an efficient catalyst for Cr(vi) reduction

Liu

Han

et al. 2016

J. Mater. Chem. A

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Controllable integration of metallic nanoparticles and metal-organic frameworks (MOFs) may create a new material with multifunctional applications. In this work, an emerging type of core-shell nanostructure, in which the metallic Pd nanoparticles cores were encapsulated by the MOF (ZIF-67) shells, was facilely synthesized through an impregnationreduction process. The as-synthesized Pd@ZIF-67 material, with highly dispersed Pd nanoparticles encapsulated in the porous ZIF-67 structure, exhibited favorable catalytic performance towards the formic acid (HCOOH)-induced reduction of highly toxic hexavalent chromium (Cr(VI)). In this process Cr(VI) was converted the to Cr(III) within 5 min, and the material could be reused for 10 times without significant loss of its catalytic activity. The highly hydrophilic and swellable nature of the ZIF-67 was proposed to be responsible mainly for the favorable durability of the Pd@ZIF-67. The results provided in this work may pave a way for the concise preparation of nano-hybrid catalysts with high performance and durability for the pollutants elimination.An emerging type of core-shell nanostructure, in which the metallic Pd nanoparticles cores were encapsulated by the MOF (ZIF-67) shells, was facilely synthesized through an impregnation-reduction process

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Section: Discussionmentioning

confidence: 99%

Hydrophilic swellable metal–organic framework encapsulated Pd nanoparticles as an efficient catalyst for Cr(vi) reduction

Liu

Han

et al. 2016

J. Mater. Chem. A

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“…In contrast, Cr(III) is much less toxic and less mobile in the nature and trace amounts of (Cr 2 O 7 2− + 8H + + 3H 2 → 2Cr 3+ + 7H 2 O) [18,26]. However, these colloidal Pd NPs [17][18][19] tend to aggregate in their long time use because of the high surface energy. Meanwhile, isolation and reuse of these nanocatalysts is also very difficult.…”

Section: Introductionmentioning

confidence: 88%

Palladium nanoparticles supported on amine-functionalized SiO2 for the catalytic hexavalent chromium reduction

Çelebı

Yurderi

Kaya

et al. 2016

Applied Catalysis B: Environmental

199

138

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“…Thus, the removal of Cr VI is one of the foremost goal for environmental protection by either adsorption or reduction processes . The reduction of Cr VI to Cr III by formic acid is considered as one of the best and simplest techniques, especially in the presence of various metal nanoparticles (in particular, Pd‐based materials), as no extra pollution results in from the byproducts by following this protocol …”

Section: Resultsmentioning

confidence: 99%

Metal Bromide Controlled Interfacial Aromatization Reaction for Shape‐Selective Synthesis of Palladium Nanostructures with Efficient Catalytic Performances

Dutta

Ray

Roy

et al. 2016

Chemistry A European J

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Herein, the effect of diverse metal bromides for the shape evolution of palladium nanostructures (Pd NS) has been demonstrated. Aromaticity-driven reduction of bromopalladate(II) is optimized to reproducibly obtain different Pd NS at the water/organic layer interface. In this soft interfacial strategy, a redox potential driven reaction has been performed, forming the thermodynamically more stable (>10(4) -fold) PdBr4 (2-) precursor from PdCl4 (2-) by adding extra metal bromides. In the process, the reductant, Hantzsch dihydropyridine ester (DHPE), is aromatized. Interestingly, alkali metal bromides devoid of coordination propensity exclusively evolve Pd nanowires (Pd NWs), whereas in the case of transition metal bromides the metal ions engage the 'N' donor of DHPE at the interface, making the redox reaction sluggish. Hence, controlled Pd nanoparticles growth is observed, which evolves Pd broccolis (Pd NBRs) and Pd nanorods (Pd NRs) at the interface in the presence of NiBr2 and CuBr2 , respectively, in the aqueous solution. Thus, the effect of diverse metal bromides in the reaction mixture for tailor-made growth of the various Pd NS is reported. Among the as-synthesized materials, the Pd NWs stand to be superior catalysts and their efficiency is almost 6 and 2.5 times higher than commercial 20 % Pd/C in the electrooxidation of ethanol and Cr(VI) reduction reaction by formic acid, respectively.

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Highly efficient reduction of hexavalent chromium on amino-functionalized palladium nanowires

Cited by 73 publications

References 42 publications

Hydrophilic swellable metal–organic framework encapsulated Pd nanoparticles as an efficient catalyst for Cr(vi) reduction

Hydrophilic swellable metal–organic framework encapsulated Pd nanoparticles as an efficient catalyst for Cr(vi) reduction

Palladium nanoparticles supported on amine-functionalized SiO2 for the catalytic hexavalent chromium reduction

Metal Bromide Controlled Interfacial Aromatization Reaction for Shape‐Selective Synthesis of Palladium Nanostructures with Efficient Catalytic Performances

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