Green synthesis, characterization and catalytic degradation studies of gold nanoparticles against congo red and methyl orange

Umamaheswari, C.; Lakshmanan, A; Nagarajan, N. S.

doi:10.1016/j.jphotobiol.2017.10.017

Cited by 230 publications

(66 citation statements)

References 52 publications

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“…Kamal et al reported that the CR reduction reaction proceeded with a rate constant of 0.2683 min -1 using copper nanoparticles-chitosan coated filter paper catalyst [47]. Similarly, a rate constants of 0.3308, 1.7 × 10 −3 s −1 , 0.559 and 2.1 × 10 −3 were reported for Co-Cu/ZnPC-Chitosan nanocomposite [21], gold nanoparticles synthesized using 5,7-dihydroxy-6-metoxy-3ʹ,4ʹ methylenedioxyisoflavone (Dalspinin) obtained from Dalbergiacoromandeliana roots [55], Ag and Pt Nanoparticles [56], and nanoporous gold [57]. The extra high values of the rate constants in some of those reports were due to the extremely small particle size of their catalyst.…”

Section: Resultsmentioning

confidence: 70%

NiO powder synthesized through nickel metal complex degradation for water treatment

Kavitha¹,

Kumar²,

Prasad³

et al. 2019

Desalination and Water Treatment

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a b s t r a c tThis study was aimed to synthesize nickel oxide (NiO) powder and its subsequent use in bactericidal activities by exploring the role of interaction at nanoparticle-bacteria interface of E. coli (gram negative) microorganism as well as water treatment by catalysing the two toxic azo dyes reduction reactions by sodium borohydride. The NiO nanoparticles were synthesized through single-step, residue free, in situ thermal decomposition method. Their size, structural and morphological features were confirmed through various analytical tools. An average size of 7-8 nm, high crystallinity and cubic crystal structure of the synthesized nanoparticles was confirmed by XRD and HR-TEM analyses. The NiO nanoparticles revealed virtuous bactericidal activities against pathogenic E. coli. Field emission scanning electron microscopy images were used as the evidence of the cell wall deterioration. The prepared NiO nanoparticles were also used in the catalytic reduction reactions of methyl orange (MO) and congo red (CR) dyes by sodium tetra-borohydrate. The reaction rate constants for the MO and CR were 0.4989 and 0.298 min -1 , respectively. The reaction mechanism, comparison with other catalyst and recyclability of the NiO were discussed.

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Section: Resultsmentioning

confidence: 70%

NiO powder synthesized through nickel metal complex degradation for water treatment

Kavitha¹,

Kumar²,

Prasad³

et al. 2019

Desalination and Water Treatment

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“…As a final test, non-catalytic conditions were employed. There are literature reports where non-catalytic quantities of metal (> 10 mol% metal) have been employed successfully [9,12,17], hence, the catalyst loading was increased to 50 mol% Au and the reducing agent was kept at 275 equivalents. These conditions are similar to those employed by Das and co-workers [17].…”

Section: Recycling Of Catalystmentioning

confidence: 99%

“…The catalytic studied showed that the magnetically recoverable nanocatalyst could reduce 4-nitrophenol to 4-aminophenol in the presence of sodium borohydride within minutes and could be recycled up to eleven times without a significant loss in activity [7]. Similarly, unsupported gold nanoparticles have been used to catalyze reductive dye degradation [9][10][11][12]. Gold nanoparticles produced by various green synthetic methods and with sizes in the range of 10-50 nm have been employed to successfully reduce methylene blue, methyl orange and Congo red in the presence of sodium borohydride.…”

Section: Introductionmentioning

confidence: 99%

“…Gold nanoparticles produced by various green synthetic methods and with sizes in the range of 10-50 nm have been employed to successfully reduce methylene blue, methyl orange and Congo red in the presence of sodium borohydride. Unlike their supported counterparts, the recyclability of these gold nanoparticles was not considered [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Raspberry-like gold-decorated silica (SSx–AMPS–Au) nanoparticles for the reductive discoloration of dyes

Blanckenberg

Malgas-Enus

2019

SN Appl. Sci.

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SS x -AMPS-Au nanoparticles were designed and synthesized for use as catalysts in the reductive discoloration of organic dyes. The catalysts are raspberry-like structures consisting of amorphous silica nanoparticle cores, SS x (x = 20, 50 and 100 nm), functionalized with amine groups and decorated with discrete gold nanoparticles. Evaluation of these nanoraspberries for the discoloration of methylene blue in both metal-catalyzed and metal-mediated reactions showed significantly enhanced rates of reduction (< 900 s) as compared to the catalyst-free reactions (> 24 h). Furthermore, the SS x -AMPS-Au nano-raspberries could also successfully reduce a range of anionic and cationic organic dyes, including methyl orange, rhodamine B, congo red, malachite green and crystal violet. The most promising catalyst was SS 50 -AMPS-Au, which comprized of ~ 3.5 nm gold nanoparticles on a 50 nm silica sphere. SS 50 -AMPS-Au showed significantly higher activity for all reactions. Comparison of the non-recyclable catalytic system and the recyclable metal-mediated system showed that the catalytic system is the greener of the two. Graphic abstract

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“…These dye pollutants may create numerous problems like skin irritation, liver and kidney damage, also poisoning the central nervous system of humans and animals [8]. Therefore, the research about removal of methyl orange from wastewater is important and urgent.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Flower-like CeO2 with Intrinsic Oxidase Activity for Methyl Orange Degradation Applications

Li¹,

Li²,

Yue³

et al. 2018

dteees

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Abstract. Since the CeO2 materials were found with oxidase-like activity, they were received wide attention because of without the addition of an unstable oxide substrate H2O2 in the catalytic process, while, up to now the research about their application in catalytic oxidation of dye wastewater have hardly been reported. In this paper, flower-like CeO2 were synthesized and were characterized by SEM, XRD. The results showed that these CeO2 materials possessed the intrinsic oxidase activity. The property of flower-like CeO2 removing methyl orange was investigated. It was observed that the degradation rate can reach 77.5% with 40 mg CeO2 dosage and for 2 h at pH 4 when the concentration of methyl orange is 20 mgꞏL −1. These results provide strong evidence that flower-like CeO2 can be utilized as an oxidase mimetic for efficient catalytic degradation of the dye wastewater.

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Green synthesis, characterization and catalytic degradation studies of gold nanoparticles against congo red and methyl orange

Cited by 230 publications

References 52 publications

NiO powder synthesized through nickel metal complex degradation for water treatment

NiO powder synthesized through nickel metal complex degradation for water treatment

Raspberry-like gold-decorated silica (SSx–AMPS–Au) nanoparticles for the reductive discoloration of dyes

Fabrication of Flower-like CeO2 with Intrinsic Oxidase Activity for Methyl Orange Degradation Applications

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