Ag nanoshell catalyzed dedying of industrial effluents

Balakumar, Vellaichamy; Prakash, P.

doi:10.1039/c6ra02937j

Cited by 65 publications

(27 citation statements)

References 45 publications

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“…The slope of the linear plot gives the rate constant of 0.0497 ± 0.0005 s −1 . The larger rate constant with Pd/C‐dots was achieved compared to other reported catalysts (Table S3, Supporting Information) showing the superior catalytic performance in the reduction of EY …”

Section: Resultsmentioning

confidence: 85%

Multifunctional Nanohybrid of Palladium Nanoparticles Encapsulated by Carbon‐Dots for Exploiting Synergetic Applications

Dhenadhayalan

Hsin

Lin

2019

Adv Materials Inter

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and textile. [2,7] It can be readily bound to biomolecules and consequently used as a strain to tissue and cells. [8] However, the application of abnormal level of EY becomes toxic and unfriendly to both the environment and living things. The development of reduction/degradation of nitro compound and dye is thus much needed to convert these materials into harmless products. For instance, the 4-NP and EY could be catalytically reduced into the formation of 4-aminophenol and reduced form of EY, respectively, and believe that this process could become potentially an effective way to treat 4-NP and EY in polluted water. Accordingly, the design and development of proficient catalyst are a significant task for the catalytic reduction of 4-NP and EY with aspects of the efficient and fast process. The nanomaterial-based catalysts are enormously developed for their superior catalytic performance in the reduction of pollutants. [9][10][11][12][13] In general, metal nanoparticles are usually adopted for the catalysis application; especially palladium nanoparticles (Pd NPs) exhibited excellent catalytic activities. [14][15][16] Such metal nanoparticles play a vital role in the catalytic reduction showing effective performance compared to other bare nanomaterials. In order to further improve their catalytic activity, the metal nanoparticles were incorporated with diverse nanomaterials including carbon-based materials, transition metal dichalcogenides (TMD), and porous organic cages. [17][18][19][20][21][22][23][24][25] Compared to other fluorescent nanomaterials, the C-dots can be easily synthesized from different kind of sources including organic molecules, biowastes, proteins, amino acids, and so on. [26][27][28][29][30][31][32] Moreover, the surface of C-dots can be modified with several capping agents to improve their fluorescence properties according to the applications. [33][34][35][36][37] That's why the C-dots have been extensively utilized in the fields of chemo-and biosensors, and optoelectronic applications. Thus far, the C-dots are much less utilized in the catalysis as in the sensing application. By taking advantage of C-dots and Pd NPs, this work aims to develop a superior multifunctional nanohybrid in the multiple applications including chemical sensor and catalysis.With this intention, we have synthesized carbon-dots to encapsulate palladium nanoparticles (Pd/C-dots) by the photochemical method. Prior to the synthesis of Pd/C-dots, Palladium nanoparticles encapsulated in the carbon dots (Pd/C-dots) are demonstrated to play a role of multifunctional nanohybrid in the synergetic applications of sensor and catalysis. The photochemical method is applied to synthesize Pd/C-dots in which Pd nanoparticles (NPs) are dispersedly encapsulated by C-dots layer. The nanohybrid can function as a fluorescent sensor and reductive catalyst, due to the inherent properties of C-dots and Pd NPs, respectively. The Pd/C-dots exhibit a highly selective and sensitive detection toward the nickel (Ni 2+ ) ion with a detection limit of ...

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Section: Resultsmentioning

confidence: 85%

Multifunctional Nanohybrid of Palladium Nanoparticles Encapsulated by Carbon‐Dots for Exploiting Synergetic Applications

Dhenadhayalan

Hsin

Lin

2019

Adv Materials Inter

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“…Using these plots, apparent activation energy (Ea), apparent activation enthalpy (▵H*) and apparent activation entropy (▵S*) values were calculated to be 24.5 kJ/mol, 21.9 kJ/mol and −192 J/mol K, respectively. The activation energy obtained by Pd 2 /GO catalyst in Cr(VI) reduction is lower than those found by Pd@γ‐Al 2 O 3 (76.2 kJ/mol), Pd NPs/SiO 2 ‐NH 2 (25.9 kJ/mol) and Pd@TMV (27.3 kJ/mol) catalysts reported for the same reaction . If we assume that the apparent activation parameters calculated from the macroscopic kinetic data given above are relevant to the most critical activation step for Pd 2 /GO catalyzed Cr(VI) reduction mechanism, one can claim that the positive magnitude of the apparent activation enthalpy and large negative value of the apparent activation entropy suggest the presence of an associative reaction step revealing a transition state.…”

Section: Resultsmentioning

confidence: 99%

Palladium Nanoparticles Decorated Graphene Oxide: Active and Reusable Nanocatalyst for the Catalytic Reduction of Hexavalent Chromium(VI)

et al. 2017

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Today, the catalytic reduction of Cr(VI) to Cr(III) stands one of the most important challenges in the environmental chemistry and catalysis due to highly stable, contaminant and toxic nature of Cr(VI). In this study, we show that a new nanocatalyst system comprised of 3-aminopropyltriethoxysilane (APTS) stabilized palladium(0) nanoparticles grafted onto the surface of graphene oxide (Pd/GO) efficiently works in the catalytic reduction of Cr(VI) to Cr(III) under mild reaction conditions. Pd/ GO nanocatalyst was reproducibly prepared through two-steps procedure: (i) H 2 reduction of Pd(dba) 2 (dba = dibenzylideneacetone) in the presence of APTS in THF to synthesize colloidal APTS stabilized palladium(0) nanoparticles and then (ii) the deposition of 3-aminopropyltriethoxysilane stabilized palladium (0) nanoparticles onto the surface of graphene oxide (GO) by impregnation. The characterization of Pd/GO was carried out by advanced analytical techniques. The summation of the results acquired from these analyses reveals that the formation of well-dispersed and highly crystalline palladium(0) nanoparticles on the surface of GO. The catalytic performance of the resulting Pd/GO in terms of activity and stability was assessed in the catalytic reduction of Cr(VI) to Cr(III) in aqueous solution in the presence of formic acid (HCOOH) as a reducing agent. We found that Pd/GO nanocatalyst exhibits high activity (TOF = 3.6 mol Cr 2 O 7 2 À /mol Pd 3 min) and reusability (> 90% at 5 th reuse) in this catalytic transformation at room temperature.[a] Dr.

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“…It is observed that degradation of methyl orange is classically enhanced in presence of silver nanoparticles due to electron relay effect. 25,26 As presented in Table 1, the rate constant (k) of Rh6G and MO degradation has been calculated for catalyzed reactions as 0.224 min -1 and 0.222 min -1 , and for un-catalyzed reactions as 0.049 min -1 and 0.014 min -1 , respectively.…”

Section: Catalytic Reduction Of Rh6g and Momentioning

confidence: 99%

“…This is due to the increase in the number of surface active sites and increased dye molecules adsorption on the catalyst surface. 25…”

Section: Effect Of Amount Of Catalystmentioning

confidence: 99%

“…A significant number of studies on the catalytic reactions of Ag nanoparticles (AgNPs) have been reported, such as alcohol dehydrogenation, 19 oxidation of phenylsilanes, 20 reduction of aromatic compounds, 21 and Diels-Alder cycloadditions. 22 Since during a chemical reaction, the active surface atoms dislodge the Ag-NPs, [22][23][24][25][26][27] various supports such as polymeric 28,29 and inorganic materials, including silica, 30,31 zeolite, 32,33 alumina, 34,35 ceria, 36 titania, 37,38 zirconia, 39 activated carbon, 40,41 carbon na notubes (CNTs), 42,43 and halloysite nanotubes (HNTs), [44][45][46] have been used to immobilize AgNPs. Halloysite silicate nanotubes of about 15 nm lumen, 50 nm external diameter and1000-2000 nm length are abundant in nature.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of Silver-Modified Halloysite Nanotubes and their Catalytic Performance in Rhodamine 6G and Methyl Orange Reduction

Akhondi

Jamalizadeh

2019

ACSi

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Halloysite nanotube supported Ag nanoparticles (Ag/HNT) as catalyst for reduction of Rhodamine 6G (Rh6G) and Methyl orange (MO) have been synthesized and tested. 3-glycidyloxyproyltrimethoxysilane and Triethylene tetramine were successfully utilized to modify the HNTs surface, then Ag + ions were reduced to AgNPs on this functionalized HNT surface. The structure of AgNPs-impregnated HNT wall was characterized by FTIR, XRD, TEM, FE-SEM and EDX showing the AgNPs to be 10-15 nm in size. The catalytic activity of Ag/HNTs for Rh6G and MO reduction was investigated by UV-vis spectroscopy so as catalyzed and uncatalyzed reaction rate constants could be compared. The rate constant (k) of Rh6G and MO reduction was calculated for catalyzed reactions as 0.224 min-1 and 0.222 min-1 , and for un-catalyzed reactions as 0.049 min-1 and 0.014 min-1 , respectively. The Ag/HNT catalyzer was effectively recycled six times without appreciable loss of activity. Results indicate that supporting AgNPs on HNT surface functionalized with other compounds with superior performance in reducing Rh6G and MO dyes exist.

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Ag nanoshell catalyzed dedying of industrial effluents

Abstract: A rapid way to dedye industrial effluents is reported herein using silver nanoshells (Ag-NSs) as a green catalyst.

Cited by 65 publications

References 45 publications

Multifunctional Nanohybrid of Palladium Nanoparticles Encapsulated by Carbon‐Dots for Exploiting Synergetic Applications

Multifunctional Nanohybrid of Palladium Nanoparticles Encapsulated by Carbon‐Dots for Exploiting Synergetic Applications

Palladium Nanoparticles Decorated Graphene Oxide: Active and Reusable Nanocatalyst for the Catalytic Reduction of Hexavalent Chromium(VI)

Fabrication of Silver-Modified Halloysite Nanotubes and their Catalytic Performance in Rhodamine 6G and Methyl Orange Reduction

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