Multifunctional satellite Fe3O4-Au@TiO2 nano-structure for SERS detection and photo-reduction of Cr(VI)

Lv, Bo; Sun, Zhenli; Zhang, Jiangfeng; Jing, Chuanyong

doi:10.1016/j.colsurfa.2016.10.048

Cited by 31 publications

(5 citation statements)

References 35 publications

(38 reference statements)

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“…Among different methods, SI-ATRP techniques involve the use of polymer network grafted onto the core was reported [20]. This organic/polymer can offer, inert, reusable, non-toxic, and flexible core-shell catalysts [21, 22, 23]. The surface group consists of both organic and inorganic shells with enhanced physical properties.…”

Section: Introductionmentioning

confidence: 99%

“…However, these types of homogeneous polyelectrolyte stabilized metal nanoparticles catalysts suffer with some recoverability problem in aqueous/organic phase reaction [24]. Therefore, these types of polymer stabilized metal nanoparticles are coated with insoluble heterogeneous support materials such as a polymer, Fe 3 O 4 , SiO 2 , and Al 2 O 3 [20, 23]. Especially, the magnetic core-shell supported materials are effective, eco-friendly and easy to handle.…”

Section: Introductionmentioning

confidence: 99%

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Facile synthesis of core-shell nanocomposites Au catalysts towards abatement of environmental pollutant Rhodamine B

Arumugam

Tamizhdurai

Gopinath

et al. 2019

Heliyon

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Magnetically recoverable Au nanoparticles immobilized/stabilized on core-shell nanocomposites are synthesized by the combination of suspension polymerization as well as surface initiator atom transfer radical polymerization (SI-ATRP) methods. The magnetic core-shell supported Au nanocatalysts are namely Fe3O4-PAC-AuNPs, Fe3O4-PVBC-g-PAC-AuNPs, Fe3O4-HEA-AuNPs, and Fe3O4-PVBC-g-HEA-AuNPs. Among all the catalysts, Fe3O4-PVBC-g-PAC-Au NPs exhibited an excellent activity in the reduction of Rhodamine B with an apparent rate constant of 10.77 × 10−3 s−1 and TOF value of 47.62 × 10−3 s−1 under pseudo-first order reaction condition. Further, Fe3O4-PVBC-g-PAC-Au NPs has an outstanding activity and recyclability without applying any external magnetic field. This new approach provides an exciting potential way in the preparation of recyclable metal nano-catalysts with high catalytic activity.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Facile synthesis of core-shell nanocomposites Au catalysts towards abatement of environmental pollutant Rhodamine B

Arumugam

Tamizhdurai

Gopinath

et al. 2019

Heliyon

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“…However, by enhancing the light intensity from 100 to 200, the degree of Cd(II) photoreduction was increased from 62.5 to 76.8%. In general, as the light energy becomes higher than that of the semiconductive bond, both electron pairs of the pore (e/h + ) are formed in the direction of zinc oxide’s conductivity and migrate to the semiconductive surface, reducing or oxidizing the species in the solution with high efficiency . Hence, Cd(II) photoreduction was increased by increasing the photocatalytic light irradiation.…”

Section: Resultsmentioning

confidence: 99%

“…In general, as the light energy becomes higher than that of the semiconductive bond, both electron pairs of the pore (e/h + ) are formed in the direction of zinc oxide's conductivity and migrate to the semiconductive surface, reducing or oxidizing the species in the solution with high efficiency. 48 Hence, Cd(II) photoreduction was increased by increasing the photocatalytic light irradiation. Consequently, according to the various experiments performed in this research, the optimum values for initial cadmium concentration, pH value, process time, light intensity, photocatalyst dosage, and temperature were determined to be equal to 6 ppm, 5, 6 h, 200 W, 4 g/L, and 45 °C, respectively.…”

Section: Resultsmentioning

confidence: 99%

Photoreduction and Removal of Cadmium Ions over Bentonite Clay-Supported Zinc Oxide Microcubes in an Aqueous Solution

2020

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Cadmium ion is toxic to organisms and shows persistence because of its nondegradability. Photoreduction of the cadmium ion (Cd(II)) was studied using a bentonite-supported Zn oxide (ZnO/BT) photocatalyst in an aqueous medium under ultraviolet light. The prepared ZnO/BT photocatalyst was characterized by diffuse reflectance spectroscopy, field-emission scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, photoluminescence spectroscopy, transmission electron microscopy, energy-dispersive spectroscopy, and Brunauer–Emmett–Teller/Barrett–Joyner–Halenda analysis. The effects of main parameters including pH, contact time, initial concentration of cadmium(II) ion, light intensity, temperature, and the photocatalyst dosage were investigated for obtaining appreciate reduction/removal efficiency. The maximum reduction/removal efficiency of 74.8% was obtained at optimized values which were found to be at pH 5, 6 h contact time, 6 ppm Cd(II) ion, 200 W UV light, 45 °C temperature, and 4 g/L of ZnO/BT. Reduction/removal of Cd(II) was significantly affected by light intensity so that the increment in UV intensity from 0 to 200 increased the reduction/removal efficiency from 61.2 to 76.8%. This study reports an inexpensive and environmentally friendly photocatalyst for Cd2+ reduction in real samples and prospective photoelectric materials.

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“…However, continued improvements of the feasibility and practicality of SERS spectroscopy are needed to probe the most important individual particles affecting the climate and human health (Ault and Axson, 2016) (Ofner et al, 2015). Our previous work focused on NP design and fabrication (Sun et al, 2016b) for SERS detection of environmental pollution in solution, such as mercury ions (Sun et al, 2016a), hexavalent chromium (Lv et al, 2017), polycyclic aromatic hydrocarbons (Du et al, 2016), and polybrominated diphenyl ethers . 15…”

Section: Introduction 20mentioning

confidence: 99%

Physicochemical analysis of individual atmospheric fine particles based on effective surface-enhanced Raman spectroscopy

Sun

Duan

et al. 2017

Preprint

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Abstract. Fine particle associated with haze pollution threatens the health of more than 400 million people in China. It is therefore of great importance to thoroughly investigate and understand its composition. To determine the physicochemical 10 properties in atmospheric fine particles at the micrometer level, we described a sensitive and feasible surface-enhanced Raman scattering (SERS) method using Ag foil as a substrate. This novel method enhanced the Raman signal intensities up to 10,000 a.u. for ν(NO 3 -) in fine particles with an enhancement factor of at least 56. The SERS effect of Ag foil was further studied experimentally and theoretically and found to have an enhancement factor of the order of ~ 10 4 . Size-fractionated real particle samples with aerodynamic diameters of 0.4-2.5 µm were successfully collected on a heavy 15 haze day, allowing ready observation of morphology and identification of chemical components, such as soot, nitrates, and sulfates. These results suggest that the Ag foil based SERS technique can be effectively used to determine the microscopic characteristics of individual fine particles, which will help to understand haze formation mechanisms and formulate governance policies.

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Multifunctional satellite Fe3O4-Au@TiO2 nano-structure for SERS detection and photo-reduction of Cr(VI)

Abstract: h i g h l i g h t s • A core-satellite structured Fe 3 O 4-Au@TiO 2 substrate was prepared.

Cited by 31 publications

References 35 publications

Facile synthesis of core-shell nanocomposites Au catalysts towards abatement of environmental pollutant Rhodamine B

Facile synthesis of core-shell nanocomposites Au catalysts towards abatement of environmental pollutant Rhodamine B

Photoreduction and Removal of Cadmium Ions over Bentonite Clay-Supported Zinc Oxide Microcubes in an Aqueous Solution

Physicochemical analysis of individual atmospheric fine particles based on effective surface-enhanced Raman spectroscopy

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