Pd nanospheres decorated reduced graphene oxide with multi-functions: Highly efficient catalytic reduction and ultrasensitive sensing of hazardous 4-nitrophenol pollutant

Vilian, A.T. Ezhil; Choe, Soonja; Giribabu, K.; Jang, Sung-Chan; Roh, Changhyun; Huh, Yun Suk; Han, Young‐Kyu

doi:10.1016/j.jhazmat.2017.03.015

Cited by 155 publications

(52 citation statements)

References 41 publications

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“…Since rGO was inactive toward the reduction of p ‐NP to p ‐AP, the enhancement in the catalytic activity of 23.0%Co/C‐30‐BR and 23.0%Co/C‐30‐MR might be directly related to the synergetic effect of Co NPs and rGO. In fact, it has been widely reported that the introduction of rGO can improve the catalytic activities of not only metal NPs but also metal oxides . The superior activity of the Co/rGO composites can be attributed to three factors: (a) rGO can absorb more p ‐NP ions via stacking interactions due to the rich π–π* nature of p ‐NP, providing concentrated p ‐NP ions near the Co NPs and therefore an increased collision probability between the reactants; (b) the good conductivity of rGO can boost the electron transfer rate across the interface of Co/rGO composites, and facilitate electron transfer from the BH 4 − donor to the p‐ NP ionic acceptors; and (c) the large specific surface area of rGO can improve the dispersion of Co NPs and prevent their agglomeration.…”

Section: Resultsmentioning

confidence: 99%

Microfluidic synthesis of ultrasmall Co nanoparticles over reduced graphene oxide and their catalytic properties

2020

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We prepared a one-stage microfluidic-based method for continuous synthesis of cobalt (Co) nanoparticles over reduced graphene oxide (rGO) to produce Co/rGO composites. These were generated by the coreduction of Co 2+ ions and GO with NaBH 4 which was confined within discrete aqueous plugs segmented by octane as continuous phase. Owing to the excellent transfer properties from recirculation in these plugs, ultrasmall Co nanoparticles were distributed homogeneously on the GO sheets without using any surfactants. As compared to batch methods, the average size of Co nanoparticles and the relative standard deviation decreased from 4.0 ± 1.42 nm and 35.9% to 2.0 ± 0.45 nm and 22.6%, respectively. The as-prepared Co/rGO composites exhibited superior activity towards the catalytic reduction of pnitrophenol to p-aminophenol with NaBH 4 compared with Co nanoparticles and rGO; this enhanced activity could be attributed to the synergistic effect between Co nanoparticles and rGO.

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Section: Resultsmentioning

confidence: 99%

Microfluidic synthesis of ultrasmall Co nanoparticles over reduced graphene oxide and their catalytic properties

2020

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“…In addition, the graphene oxide supported metal catalysts are stable and highly reusable. For instance, Vilian et al [38] prepared Pdnanospheres decorated reduced graphene oxide catalyst for the removal of hazardous 4-nitrophenol pollutant from water. Similarly, Liu and co-workers [39] reported Ag nanoparticles/graphene-loading loofah sponge hybrid as a catalyst for the conversion of 4-nitophenol to 4-aminophenol.…”

Section: Reduction Of 4-nitrophenolmentioning

confidence: 99%

Facile Green Preparation of Rhodium Nanoclusters Supported Nano-Scaled Graphene Platelets for Sonogashira Coupling Reaction and Reduction of p-Nitrophenol

et al. 2019

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Rhodium nanoclusters were uniformly dispersed on nano-scaled graphene platelets by a simple ‘mix and heat’ method without using any toxic reagents. Distilled water was used to obtain the homogenous dispersion of Rh-nanoclusters on graphene platelets. The morphology of the resultant catalyst (Rh(0)NCs/GNPs) was studied by means of transmission electron microscope (TEM) and atomic force microscope (AFM) analyses. The X-ray photoemission spectroscope (XPS) result confirmed the metallic form of Rh-nanoclusters in Rh(0)NCs/GNPs. The crystalline property and the interaction between Rh-nanoclusters and graphene platelets (GNPs) were studied by means of XRD and Raman analysis. The Rh-loading in Rh(0)NCs/GNPs was confirmed by scanning electron microscope and energy dispersive spectroscope (SEM-EDS) and inductively coupled plasma-mass spectroscope (ICP-MS) analysis. After being optimized, the Rh(0)NCs/GNPs used as catalyst for the reduction of 4-nitrophenol with NaBH4 and the Sonogashira coupling reaction between iodobenzene with phenylacetylene. To our delight, the Rh(0)NCs/GNPs showed excellent catalytic activity towards the reduction of 4-nitrophenol with an excellent turnover frequency (TOF) value of 112.5 min−1. The kapp and k’ values were calculated to be 62.07 × 10−3 min−1(0.002 mg of Rh(0)NCs/GNPs) and 31035 × 10−3 mg−1 min−1,respectively. Alike, under the optimal conditions, the Rh(0)NCs/GNPs gave the desired product, diphenylacetylene, in a good yield of 87% with 91% selectivity. The Rh(0)NCs/GNPs can be reused without significant loss in its catalytic activity.

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“…The traditional technique for the determination of 4-NP include gas chromatography, capillary electrophoresis, high performance liquid chromatography and electrochemical method. [6][7][8][9] However, these methods usually need expensive instruments and tedious procedures for analysis. More recently, uorescence spectrophotometry has been developed for highly sensitive detection of 4-NP.…”

Section: Introductionmentioning

confidence: 99%

Sulfur-doped graphene quantum dot-based paper sensor for highly sensitive and selective detection of 4-nitrophenol in contaminated water and wastewater

2019

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Pd nanospheres decorated reduced graphene oxide with multi-functions: Highly efficient catalytic reduction and ultrasensitive sensing of hazardous 4-nitrophenol pollutant

Cited by 155 publications

References 41 publications

Microfluidic synthesis of ultrasmall Co nanoparticles over reduced graphene oxide and their catalytic properties

Microfluidic synthesis of ultrasmall Co nanoparticles over reduced graphene oxide and their catalytic properties

Facile Green Preparation of Rhodium Nanoclusters Supported Nano-Scaled Graphene Platelets for Sonogashira Coupling Reaction and Reduction of p-Nitrophenol

Sulfur-doped graphene quantum dot-based paper sensor for highly sensitive and selective detection of 4-nitrophenol in contaminated water and wastewater

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