Preparing copper doped carbon nitride from melamine templated crystalline copper chloride for Fenton-like catalysis

Zhu, Jian‐Nan; Zhu, Xiaoqin; Cheng, Fang; Li, Peng; Wang, Fei; Xiao, Yawen; Xiong, Wei‐Wei

doi:10.1016/j.apcatb.2019.117830

Cited by 151 publications

(34 citation statements)

References 67 publications

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“…The precursor is mixed with melamine and pyrolysed by two-stage programmed heating process. The melamine is transformed to g-C 3 N 4 at 550 o C for 3 h under argon atmosphere through its poly-addition and thermo-polymerization [26]. Then it permeates into the Ni-MOF microspheres.…”

Section: Resultsmentioning

confidence: 99%

Nickel Carbon Composite With Carbon Nanotubes for Efficient Electromagnetic Wave Absorption

Qiu

Yang²,

Li³

et al. 2020

Preprint

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Nickel carbon composite with carbon nanotubes (Ni-C/CNTs) has been fabricated by pyrolysis the mixture of nickel-based metal organic framework (Ni-MOF) and melamine. The resultant Ni-C/CNTs composite is assembled from one-dimensional (1D) CNTs and three dimensional (3D) spherical Ni-C composite. Besides, the Ni-C/CNTs composite contains abundant nitrogen(N) dopants that contributes to defect dipole polarization. The diameter and length of CNTscan beeffected by changing the mass ratio of Ni-MOF and melamine. The optimizedNi-C/CNTs composite exhibits reflection loss of -55.1 dB at 10.56 GHz, and the effective absorbing bandwidth (reflection loss < -10 dB) is 11.2 GHz (6.0-17.2 GHz)with the thickness range of 1.5-4.0 mm, when the mass ratio of Ni-MOF: melamine is 1: 2. These results indicate that the mixed 1D-3D hierarchical architecture synergistically improves electromagnetic wave absorption properties. This strategy willcontribute for fabricating the carbon hybrid network consisting of metal organic frameworks derived metal/carbon hybrid and CNTs for electromagnetic wave absorption.

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Section: Resultsmentioning

confidence: 99%

Nickel Carbon Composite With Carbon Nanotubes for Efficient Electromagnetic Wave Absorption

Qiu

Yang²,

Li³

et al. 2020

Preprint

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“…With a tiny loss of copper species, the Cu/Al 2 O 3 /CN composite remains highly reactive and could efficiently catalyze the degradation of Rh B. The main features of the proposed Cu/Al 2 O 3 /CN composite and some other copper-based Fenton-like catalysts on Rh B degradation are listed in Table S1 [27,40,48,63,64,[69][70][71][72][73]. The superiority of the Cu/Al 2 O 3 /CN composite in this work is supported by its high degradation rate constant, low copper leaching, and excellent applicability in neutral and alkaline conditions.…”

Section: Scavenging Experimentsmentioning

confidence: 99%

Kinetic and Mechanistic Study of Rhodamine B Degradation by H2O2 and Cu/Al2O3/g-C3N4 Composite

et al. 2020

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The classic Fenton reaction, which is driven by iron species, has been widely explored for pollutant degradation, but is strictly limited to acidic conditions. In this work, a copper-based Fenton-like catalyst Cu/Al2O3/g-C3N4 was proposed that achieves high degradation efficiencies for Rhodamine B (Rh B) in a wide range of pH 4.9–11.0. The Cu/Al2O3 composite was first prepared via a hydrothermal method followed by a calcination process. The obtained Cu/Al2O3 composite was subsequently stabilized on graphitic carbon nitride (g-C3N4) by the formation of C−O−Cu bonds. The obtained composites were characterized through FT-IR, XRD, TEM, XPS, and N2 adsorption/desorption isotherms, and the immobilized Cu+ was proven to be active sites. The effects of Cu content, g-C3N4 content, H2O2 concentration, and pH on Rh B degradation were systematically investigated. The effect of the catalyst dose was confirmed with a specific reaction rate constant of (5.9 ± 0.07) × 10−9 m·s−1 and the activation energy was calculated to be 71.0 kJ/mol. In 100 min 96.4% of Rh B (initial concentration 20 mg/L, unadjusted pH (4.9)) was removed in the presence of 1 g/L of catalyst and 10 mM of H2O2 at 25 °C, with an observed reaction rate constant of 6.47 × 10−4 s−1. High degradation rates are achieved at neutral and alkaline conditions and a low copper leaching (0.55 mg/L) was observed even after four reaction cycles. Hydroxyl radical (HO·) was identified as the reactive oxygen species by using isopropanol as a radical scavenger and by ESR analysis. HPLC-MS revealed that the degradation of Rh B on Cu/Al2O3/CN composite involves N-de-ethylation, hydroxylation, de-carboxylation, chromophore cleavage, ring opening, and the mineralization process. Based on the results above, a tentative mechanism for the catalytic performance of the Cu/Al2O3/g-C3N4 composite was proposed. In summary, the characteristics of high degradation rate constants, low ion leaching, and the excellent applicability in neutral and alkaline conditions prove the Cu/Al2O3/g-C3N4 composite to be a superior Fenton-like catalyst compared to many conventional ones.

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“…As the substitute for g-C 3 N 4 , one current strategy is to use metal-modied g-C 3 N 4 . For instance, MgO/g-C 3 N 4 , 7 Cu/g-C 3 N 4 , 8,32 and FeO x /g-C 3 N 4 (ref. 33) have been employed to degrade organic pollutants in the dark, but they have many issues, including long reaction time, activity at low pH, high cost, and poor stability.…”

Section: Optimal Reaction Conditions Over G-c 3 N 4 (Hy-ht)mentioning

confidence: 99%

“…Thus, to solve this problem, much effort has been devoted to achieving excellent performances in the dark for better practical use. [7][8][9][10] For example, Ge et al 7 prepared a MgO/ g-C 3 N 4 catalyst by employing high-temperature calcination. Zhu et al 8 synthesized Cu-g-C 3 N 4 composites via the pyrolysis of [H 2 mela] 2 [CuCl 5 ]Cl, and Ding et al 9 developed the g-C 3 N 4 -supported iron oxide composite.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of oxygen-doped graphitic carbon nitride and its application for the degradation of organic pollutants via dark Fenton-like reactions

et al. 2020

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Preparing copper doped carbon nitride from melamine templated crystalline copper chloride for Fenton-like catalysis

Cited by 151 publications

References 67 publications

Nickel Carbon Composite With Carbon Nanotubes for Efficient Electromagnetic Wave Absorption

Nickel Carbon Composite With Carbon Nanotubes for Efficient Electromagnetic Wave Absorption

Kinetic and Mechanistic Study of Rhodamine B Degradation by H2O2 and Cu/Al2O3/g-C3N4 Composite

Synthesis of oxygen-doped graphitic carbon nitride and its application for the degradation of organic pollutants via dark Fenton-like reactions

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