Facile Synthesis of AgFeO₂‐Decorated CaCO₃ with Enhanced Catalytic Activity in Activation of Peroxymonosulfate for Efficient Degradation of Organic Pollutants

Abstract

The development of green and sustainable technologies for wastewater treatment is highly desirable but remains challenging. Herein, a self‐assembly strategy to stabilize AgFeO2 on the surface of CaCO3 (AgFeO2@CaCO3) is demonstrated. This structure is discovered to significantly prohibit the agglomeration of AgFeO2 nanoparticles and strengthen the interaction between AgFeO2 and CaCO3. When utilized in advanced oxidation processes (AOPs), AgFeO2@CaCO3 exhibits excellent catalytic performance in activating peroxymonosulfate (PMS) to degrade multiple organic pollutants. For example, complete Rhodamine B (RhB) decomposition can be achieved by AgFeO2@CaCO3 in the presence of PMS at a degradation rate of 0.312 min−1, which is 44.6 times that of bare AgFeO2. In addition, AgFeO2@CaCO3 demonstrates excellent stability, recyclability, general applicability, and strong resistance to the solution pH. 1O2 and O2·− are the predominant reactive oxygen species in RhB degradation. The rapid RhB degradation can be attributed to the mesoporous structure and high specific surface area of AgFeO2@CaCO3, the cycling of Fe(III)/Fe(II) and Ag(I)/Ag(0), and the presence of hydroxyl groups that facilities PMS activation, which is validated by density functional theory calculations. This study provides a feasible and scalable strategy to synthesize green and recyclable heterogeneous catalysts for wastewater remediation via PMS‐based AOPs.

Defect Engineering of MOF-Derived Carbon for Peroxymonosulfate Activation to Degrade Sulfadiazine: Roles of Carbon Vacancies and Edge Defects

“…As shown in Figure a, the presence of Cl – , H 2 PO 4 – , and NO 3 – had no discernible impact on SDZ degradation. However, the addition of HCO 3 – significantly inhibited the catalytic reaction, possibly because it would react with O 2 •– to generate CO 3 •– with low activity . In addition, NOC-1000 maintained the same catalytic activity as deionized water in river water and a groundwater matrix (Figure b).…”

“…•− to generate CO 3 •− with low activity. 53 In addition, NOC-1000 maintained the same catalytic activity as deionized water in river water and a groundwater matrix (Figure 12b). The degradation efficiency in tap water was slightly weakened, probably because of the elevated concentration of HCO 3 − in tap water, which would eliminate O 2…”