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Effects of PMS dosage (a), FeCN6 dosage (b), pH (c), RhB concentration (d), inorganic anions (e) and HA (f) on RhB degradation in the FeCN6/PMS system
Source publication
Herein, Fe(III)-doped g-C3N4 (FeCN) could efficiently activate peroxymonosulfate (PMS), which was prepared via a facile one-pot synthesis approach. The physical and chemical properties of the samples were characterized by XRD, FTIR, SEM, TEM, XPS, and BET. The FeCN/PMS system displayed high activity in the degradation of several contaminants, inclu...
Citations
... However, persulfate can generate highly oxidative sulfate radicals (SO 4− ·) from various activating factors such as oxidants, heat, strong alkalis, transition metal ions, etc. If persulfate is not activated, the persulfate anion will react with some organic chemicals [12,13]. However, the degradation effect is much less than that in the form of free radicals after activation [14]. ...
Refractory organic pollutants pose a great threat to public health in water bodies due to their toxicity and low biodegradability. Developing a method of activating persulfate efficiently and in an environmentally friendly way has become a popular topic of research in current advanced oxidation water treatment technologies. Fe(III)-g-C3N4 was prepared by the calcination method. Fe(III) was anchored on the framework of g-C3N4. The characterization analysis indicated that Fe(III) was successfully loaded on g-C3N4. The best effect for MB degradation was Fe(III)-g-C3N4 (0.1 g/L) dosed with 30 µmol/L KMnO4 for synergistic catalyzed PMS (0.1 g/L), where the degradation rate could reach 95.4%. The optimum temperature for MB degradation was determined to be 10 °C. The optimum pH range of Fe(III)-g-C3N4/Mn(VII) synergistic catalyzed PMS for MB degradation was pH 4.4–6.6 under acidic conditions, and the optimum pH range for MB degradation was pH 8–10 under alkaline conditions. The Fe(III)-g-C3N4/Mn(VII) synergistic catalyzed PMS system was also tested for the degradation of methyl orange and rhodamine b, and good degradation results were obtained with the degradation rates of 87.37% and 84%, respectively. It facilitates the reduction in pollutant emissions, improves water quality and will have a positive impact on the sustainability of the environment.
Herein, a simple solvothermal method was used to prepare the CuSx/g-C3N4 (CSG) heterojunction as efficient oxygen activators containing sulfur vacancies (SVs). The as-prepared catalyst can activate oxygen to effectively degrade...
A novel poly(triazine imide) (PTI)with intercalation of Cu⁺ ion heterogeneous catalysts was synthesized by one-pot thermal condensation of melamine and copper acetate as precursors, resulting in a material with stoichiometry of C6N8.7Cu. The microscopic morphology and structural characteristics of Cu/PTI were characterized by XRD, SEM, TEM, FT-IR, and XPS. The characterization results corroborated the highly condensed triazine-based structure, and copper mainly existed in the form of Cu⁺. The possible formation mechanism of composite materials was proposed. The prepared composite Cu/PTI catalyst was used to activate PMS to enhance the simulated pollutant RhB degradation under sunlight irradiation. The experimental results show that sunlight could improve the activation efficiency of Cu/PTI to PMS, Cu/PTI(1:4) had the best activation ability, and the degradation rate of RhB reached 96.2% in 60 min, nearly doubling that without sunlight. Critical impacting factors, initial solution pH was investigated in terms of the catalytic efficiency. The catalyst has a high ability to activate PMS to degrade pollutants in the range of pH=3-10. In addition, quencher experiments demonstrated thatO2·-, ¹ O2, hVB+, and SO4·- are the main active species, and a detailed catalytic mechanism was proposed. Thus, the enhanced reactivity of the Cu/PTI catalyst was attributed to the existence of dual catalytic sites and the synergistic effect between Cu and PTI. This strategy provides a feasible way to treat wastewater using Cu/PTI with PMS under sunlight.
