Catalytic hydrolysis of waste residue from the melamine process and the kinetics of melamine hydrolysis in NaOH solution

Gong, Hai Peng; Tang, Shengwei; Zhang, Tao

doi:10.1007/s11144-016-1014-9

Cited by 7 publications

(2 citation statements)

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“…Upon being submerged in 1 M NaOH for 1 day, the (001) peak decreased moderately as shown in the PXRD pattern (Figure S18, green curve), which can be explained by the partial hydrolysis of melamine moiety in NaOH solution. 48 To evaluate the Fenton-like photocatalytic activity of Tp-COFs, rhodamine (RhB) dye was selected as the model organic pollutant. Before the photocatalytic experiments, a trial was firstly conducted to ascertain the adsorption performance of Tp-Mela COF (0.167 g L -1 ) for the aqueous RhB solution (100 mg L -1 ), revealing that the adsorption-desorption equilibrium was achieved rapidly within 30 min with the removal efficiency of ~20% and a prominent adsorption capacity of ~120 mg g -1 ( Figure S19).…”

Section: Resultsmentioning

confidence: 99%

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Metal-Free Fenton-like Photocatalysts Based on Covalent Organic Frameworks

Liao¹,

Ke²,

Wang³

et al. 2021

Preprint

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The Fenton reaction is one of the most efficient and widely used advanced oxidation processes for remediating the ever-growing water pollution. Metal-free photocatalysts for Fenton-like reactions have gathered enormous scientific interest for their advantages including board pH operation range and high stability. Herein, we demonstrate a metal-free covalent organic framework (COF)-based standalone photocatalyst with superior reactivity and reusability for Fenton-like reactions at acid and neutral pH solutions, which can be attributed to its large porosity, high density of the photoactive triazine moiety, vertical π arrays formed by eclipsed layer stacking and the β‑ketoenamine linkage. Our experiments showed that the photocatalyst can absorb visible light effectively for activation of H2O2, producing abundant reactive oxygen species including superoxide radical (O2·-), hydroxyl radical (·OH), and singlet oxygen (1O2) for oxidizing organic pollutants. This work not only provides an efficient metal-free photocatalyst for Fenton-like reactions, but also paves the way for COFs towards advanced oxidation processes, opening up the possibilities to their future applications in industry.

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Section: Resultsmentioning

confidence: 99%

“…Moreover, the Tp-Mela COF exhibited high chemical stability after treatment in 1 M HCl aqueous solutions for 24 h (FigureS18, red curve). Upon being submerged in 1 M NaOH for 1 day, the (001) peak decreased moderately as shown in the PXRD pattern (Figure S18, green curve), which can be explained by the partial hydrolysis of melamine moiety in NaOH solution 48.…”

mentioning

confidence: 96%