Effect of boron doping level on the photocatalytic activity of graphene aerogels

Chowdhury, Shamik; Jiang, Yiqun; Muthukaruppan, Solai; Balasubramanian, Rajasekhar

doi:10.1016/j.carbon.2017.11.089

Cited by 69 publications

(44 citation statements)

References 70 publications

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“…N/S-and B-doped graphene were prepared with a GO suspension (1.0 g L −1 ) and thiourea, CH 4 N 2 S (99%, Alfa Aesar, Haverhill, MA, USA) [46], or boric acid, H 3 BO 3 (Acros Organics, Geel, Belgium) [40], as N/S or B precursors, respectively by hydrothermal reduction [47]. The GO: Precursor ratio was selected as 1:10, in agreement with the optimized value in a previous study [46].…”

Section: Synthesis Of Heteroatom Reduced Graphene Oxide (Rgo)mentioning

confidence: 99%

“…The XPS analysis of the rGONS sample (labelled as rGO-NS-10) and B-doped graphene (prepared by a similar synthesis procedure to the rGOB sample) was obtained and discussed in previous studies [40,46]. The nitrogen species in the rGONS material were the amino group (-NH 2 ), N-pyridinic species (N6), N-pyrrolic form (N5), and N-graphitic (NQ), whereas the sulphur groups correspond mainly to S-thiophene.…”

Section: Materials Characterizationmentioning

confidence: 99%

“…However, the design of composites using graphene with an optimized concentration of external atoms and defects still remains a challenge in photocatalytic applications and needs to be more exhaustively studied [ 34 , 37 , 39 , 40 ].…”

Section: Introductionmentioning

confidence: 99%

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Functionalized Graphene Derivatives and TiO2 for High Visible Light Photodegradation of Azo Dyes

et al. 2020

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Functionalized graphene derivatives including graphene oxide (GO), reduced graphene oxide (rGO), and heteroatom (nitrogen/sulphur (N/S) or boron (B))-doped graphene were used to synthesize composites with TiO2 (T). The photocatalytic performance of composites was assessed for the degradation of Orange G dye (OG) under simulated solar light. All the prepared graphene derivatives—TiO2 composites showed better photocatalytic performance than bare TiO2. A higher photocatalytic activity was found for the composites containing GO and N/S co-doped rGO (kapp = 109.2 × 10−3 and 48.4 × 10−3 min−1, for GO-T and rGONS-T, respectively). The influence of both initial solution pH and the reactive species involved in the OG degradation pathway were studied. The photocatalytic activity of the samples decreased with the increase of the initial pH (from 3.0 to 10.0) due to the occurrence of electrostatic repulsive forces between the photocatalysts surface and the molecules of OG, both negatively charged. The use of selective scavengers showed that although the photogenerated holes dominate the degradation mechanism, radicals and singlet oxygen also participate in the OG degradation pathway. In addition, reutilization experiments indicated that the samples were stable under the reaction conditions used.

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Section: Synthesis Of Heteroatom Reduced Graphene Oxide (Rgo)mentioning

confidence: 99%

Section: Materials Characterizationmentioning

confidence: 99%

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Functionalized Graphene Derivatives and TiO2 for High Visible Light Photodegradation of Azo Dyes

et al. 2020

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“…The higher photocatalytic activity might indicate a more effective interfacial electron transfer between the conduction band of B 2 O 3 and that of Fe ion, which provided better charge separation and therefore less recombination of photoinduced electrons with holes [27]. The rate of photocatalytic degradation was estimated by fitting the experimental data to the the pseudo-first order kinetic model [28]:…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Effect of Iron Doping on Photocatalytic Activity of Boron Oxide Processed Using Polyvinyl Borate Precursor

Köysüren

2019

Journal of Boron

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In this study, boron oxide (B 2 O 3 ) powder has been synthesized by the pyrolysis of polyvinyl borate precursor in air. For this purpose, polyvinyl borate precursor was synthesized through the condensation reaction of polyvinyl alcohol and boric acid, and then the polymeric precursor was pyrolyzed at 500°C. The as-prepared B 2 O 3 particles were doped with iron (Fe) ions using the wet impregnation method. The photocatalytic activity of both undoped B 2 O 3 and iron doped B 2 O 3 (Fe-B 2 O 3 ) powders was studied by investigating the degradation of the model dye, methylene blue, under UV light irradiation. It was pointed out that iron doped B 2 O 3 powder exhibited enhanced photocatalytic activity compared to undoped one. In addition, various techniques of characterization such as FTIR, XRD, FESEM, EDX and UV-Vis spectroscopy were performed to confirm the synthesis of B 2 O 3 particles and the presence of iron ions in the crystal structure of the prepared photocatalyst. The novelty of this study was to research the photocatalytic performance of both B 2 O 3 and Fe-B 2 O 3 photocatalysts.

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“…It is worth noting that the introduction of magnetic nanomaterials is a feasible way to make the catalyst easy to recover. 24 , 25 Many researchers have prepared a composite photocatalyst combining Fe 3 O 4 with Bi 2 WO 6. 26 , 27 Fe 3 O 4 and Bi 2 WO 6 combine to form many different types of core–shell photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Effective Visible Light-Driven Photocatalytic Degradation of Ciprofloxacin over Flower-like Fe₃O₄/Bi₂WO₆ Composites

et al. 2021

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Photocatalytic degradation of organic pollution is a vital path to deal with environmental problems. Here, a direct Zscheme 2D/2D heterojunction of a Fe 3 O 4 /Bi 2 WO 6 photocatalyst is fabricated for the degradation of ciprofloxacin by a self-assembly strategy. Furthermore, to characterize the morphology of the obtained composite photocatalysts, various kinds of characterization methods were employed like XRD, XPS, SEM, and TEM. It is indicated that the flower-like photocatalyst is composed of nanosheets. Comparable photocatalysts were prepared by controlling the hydrothermal temperature and the iron content. In the photocatalytic degradation of ciprofloxacin (CIP) in water, under visible light irradiation, FB-180 (synthesized at 180 °C with 4% iron content) presents approximately 99.7% degradation efficiency in only 15 min. Meanwhile, during photocatalytic degradation reactions, the Fe 3 O 4 /Bi 2 WO 6 heterojunction also displayed excellent stability, which still kept above 90% degradation efficiency after five consecutive cycles. UV−Vis DRS and M-S analyses showed that the Fe 3 O 4 /Bi 2 WO 6 catalyst has a strong visible light absorption capacity and the transfer pathway of photo-induced charge carriers. PL, EIS, and TPR showed that Fe 3 O 4 /Bi 2 WO 6 has an efficient separation and transfer rate of the photo-generated carriers. ESR analysis proved that the superoxide radical ( • O 2 − ) and hydroxyl radical ( • OH) play a major role in the Fe 3 O 4 /Bi 2 WO 6 photocatalytic system. This special 2D/2D heterojunction we proposed may have huge potential for marine pollution treatment by photocatalysis degradation with dramatically boosted activities.

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Effect of boron doping level on the photocatalytic activity of graphene aerogels

Cited by 69 publications

References 70 publications

Functionalized Graphene Derivatives and TiO2 for High Visible Light Photodegradation of Azo Dyes

Functionalized Graphene Derivatives and TiO2 for High Visible Light Photodegradation of Azo Dyes

Effect of Iron Doping on Photocatalytic Activity of Boron Oxide Processed Using Polyvinyl Borate Precursor

Effective Visible Light-Driven Photocatalytic Degradation of Ciprofloxacin over Flower-like Fe₃O₄/Bi₂WO₆ Composites

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Effect of boron doping level on the photocatalytic activity of graphene aerogels

Cited by 69 publications

References 70 publications

Functionalized Graphene Derivatives and TiO2 for High Visible Light Photodegradation of Azo Dyes

Functionalized Graphene Derivatives and TiO2 for High Visible Light Photodegradation of Azo Dyes

Effect of Iron Doping on Photocatalytic Activity of Boron Oxide Processed Using Polyvinyl Borate Precursor

Effective Visible Light-Driven Photocatalytic Degradation of Ciprofloxacin over Flower-like Fe3O4/Bi2WO6 Composites

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Effective Visible Light-Driven Photocatalytic Degradation of Ciprofloxacin over Flower-like Fe₃O₄/Bi₂WO₆ Composites