Designed fabrication of sulfide-rich bi-metallic-assembled MXene layered sheets with dramatically enhanced photocatalytic performance for Rhodamine B removal

Vigneshwaran, Sivakumar; Park, Chang Min; Meenakshi, Sankaran

doi:10.1016/j.seppur.2020.118003

Cited by 56 publications

(29 citation statements)

References 37 publications

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“…The superoxide and • OH radicals that are produced are highly active oxidants that degrade RhB to form nontoxic products (CO 2 and H 2 O) (eq ) and almost completely remove its color. Therefore, the synergistic effects of graphene, nitrogen doping, NiCo, and GNS combine, leading to the efficient degradation of RhB under visible lightrather than solely the effect of graphene itself, as has been stated in the literature …”

Section: Resultsmentioning

confidence: 80%

“…Quite the opposite, the electrons in the NiCo-MOF conduction band migrate to a lower Fermi graphene level, resulting in the Schottky barrier on the NiCo-MOF@GNS-700 interface (eq ). Consequently, recombination of the NiCo-MOF electron/hole pair is impeded, and the band gap is narrowed (as evident from UV–vis DRS spectra), promoting the mobility of the charge carrier for RhB degradation. , In addition, the presence of more GNS tuned the electronic structure, favored the adsorption of more RhB on the elevated surface area of the NiCo-MOF@GNS-700 surface, and promoted the mobility of the charge carrier for dye degradation.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the synergistic effects of graphene, nitrogen doping, NiCo, and GNS combine, leading to the efficient degradation of RhB under visible lightrather than solely the effect of graphene itself, as has been stated in the literature. 48…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Imidazolatic-Framework Bimetal Electrocatalysts with a Mixed-Valence Surface Anchored on an rGO Matrix for Oxygen Reduction, Water Splitting, and Dye Degradation

Palani

Anitha²,

Karuppiah

et al. 2021

ACS Omega

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This paper presents a simple strategy for manufacturing bifunctional electrocatalystsgraphene nanosheets (GNS) coated with an ultrafine NiCo-MOF as nanocomposites (denoted NiCo-MOF@GNS) having a N-doped defect-rich and abundant cavity structure through one-pool treatment of metal− organic frameworks (MOFs). The precursors included N-doped dodecahedron-like graphene nanosheets (GNS), in which the NiCo-MOF was encompassed within the inner cavities of the GNS (NiCo-MOF@GNS) at the end or middle portion of the tubular furnace with several graphene layers. Volatile imidazolate N x species were trapped by the NiCo-MOF nanosheets during the pyrolysis process, simultaneously inserting N atoms into the carbon matrix to achieve the defect-rich porous nanosheets and the abundantly porous cavity structure. With high durability, the asprepared nanomaterials displayed simultaneously improved performance in the oxygen reduction reaction (ORR), the oxygen evolution reaction (OER), and photocatalysis. In particular, our material NiCo-MOF@GNS-700 exhibited excellent electrocatalytic activity, including a half-wave potential of 0.83 V (E ORR, 1/2 ), a low operating voltage of 1.53 V (E OER, 10 ) at 10 mA cm −2 , a potential difference (ΔE) of 1.02 V between E OER, 10 and E ORR, 1/2 in 0.1 M KOH, and a low band gap of 2.61 eV. This remarkable behavior was due to the structure of the defect-rich porous carbon nanosheets and the synergistic impact of the NPs in the NiCo-MOF, the N-doped carbon, and NiCo-N x . Furthermore, the hollow structure enhanced the conductivity and stability. This useful archetypal template allows the construction of effective and stable bifunctional electrocatalysts, with potential for practical viability for energy conversion and storage.

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Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 99%

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Imidazolatic-Framework Bimetal Electrocatalysts with a Mixed-Valence Surface Anchored on an rGO Matrix for Oxygen Reduction, Water Splitting, and Dye Degradation

Palani

Anitha²,

Karuppiah

et al. 2021

ACS Omega

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show abstract

“…With the rapid development of industry, more and more industrial wastewater is discharged into the environment without sufficient treatment, resulting in increasingly serious pollution of water resources. , Common pollutants in the water environment include organic dyes, heavy metals, pesticides, antibiotics, and hormone drugs. − Among them, dyes are the main source of water pollution, which are widely used in papermaking, textile, leather, printing, and dyeing industries. − Rhodamine B (RhB), a xanthene-type cationic dye, is commonly used in rubber, paper, and plastic manufacturing industries. − Insufficient treatment for RhB in water bodies could result in environmental pollution and cause harm to human health . Therefore, the removal of RhB is of great significance.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Adsorption of Rhodamine B on Modified Oil-Based Drill Cutting Ash: Characterization, Adsorption Kinetics, and Adsorption Isotherm

Zhao

Sun

et al. 2021

ACS Omega

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In this paper, phosphoric acid (H 3 PO 4 ), hydrochloric acid (HCl), and hydrogen peroxide (H 2 O 2 ) were employed for the modification of oil-based drill cutting ash (OBDCA) for the first time. The adsorption of rhodamine B (RhB) on modified oilbased drill cutting ash (MOBDCA) in an aqueous medium was investigated. H 2 O 2 -modified OBDCA had the optimal adsorption efficiency for RhB. The physical and chemical properties of MOBDCA were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), ζ-potential, N 2 adsorption−desorption isotherm, and pore size distribution. The effect of the pH value (3−11), reaction time (10−720 min), and initial RhB concentration (10−200 mg/ L) on RhB adsorption was discussed. The adsorption kinetics highly fitted with the pseudo-second-order model (R 2 > 0.99), which indicated that the adsorption process was dominated by chemisorption. The adsorption isotherm fitted well with the Langmuir and Freundlich models (R 2 > 0.97), which indicated the monolayer adsorption process and the heterogeneous adsorption process, respectively. The theoretic adsorption capacity (50 mg/g) for RhB was achieved by H 2 O 2 -modified OBDCA. This paper provides a promising method of resource utilization of OBDCA to treat organic pollutants.

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“…[21,22] Nevertheless, research on the application of nonconjugated PDs as photocatalysts has been rarely reported. Much work so far has focused on metal oxide photocatalysts with no detrimental products under ambient conditions, [23][24][25][26][27] including Cu/ZnO catalysts, [28] BiOCl/TiO 2 composite, [29] H 3 PW 12 O 40 /Ag 3 PO 4 powder, [30] of which the fabrication makes it too costly for practical use, and the narrow band gap leads to fast recombination of photogenerated charge carriers. By comparison, it is feasible to modulate the band gap of nonconjugated PDs with controllable electronic structures and flexible processability.…”

Section: Introductionmentioning

confidence: 99%

Color‐tunable and bright nonconjugated fluorescent polymer dots and fast photodegradation of dyes under visible light

et al. 2021

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Nonconjugated polymer dots (PDs) without largely conjugated structures entitle their advantages such as environment friendliness, nontoxicity, and intrinsic fluorescence. However, color-tunable PDs remain a challenge. Herein, polyvinyl pyrrolidone (PVP) and ascorbic acid (AA) are used to synthesize nonconjugated PDs, namely, PA PDs with intensive blue emission. The introduction of a third component, m-phenylenediamine (MPD), redshifted the emission to green. The asprepared color-tunable blue to green emissive PDs exhibit excellent properties, whether in solution or in solid state, originated from the mechanism of clusteringtriggered emission (CTE) induced by the overlap of electron-rich atoms, the strong inter/intrachain interaction. The quantum yields of blue and green PDs reached up to 15.07% and 28.22%, respectively. Furthermore, PA PDs were successfully applied to the highly efficient photocatalytic degradation for dyes: methylene blue (MB) and methyl orange (MO) were degraded by 89.9% and 93.8% within 20 min under visible light, respectively.

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Designed fabrication of sulfide-rich bi-metallic-assembled MXene layered sheets with dramatically enhanced photocatalytic performance for Rhodamine B removal

Cited by 56 publications

References 37 publications

Imidazolatic-Framework Bimetal Electrocatalysts with a Mixed-Valence Surface Anchored on an rGO Matrix for Oxygen Reduction, Water Splitting, and Dye Degradation

Imidazolatic-Framework Bimetal Electrocatalysts with a Mixed-Valence Surface Anchored on an rGO Matrix for Oxygen Reduction, Water Splitting, and Dye Degradation

Enhanced Adsorption of Rhodamine B on Modified Oil-Based Drill Cutting Ash: Characterization, Adsorption Kinetics, and Adsorption Isotherm

Color‐tunable and bright nonconjugated fluorescent polymer dots and fast photodegradation of dyes under visible light

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