Oxygen Vacancies Enhanced Ozonation toward Phenol Derivatives Removal over O_v-Bi₂O₃

Abstract

Phenolic molecules are a kind of toxic organic pollutants commonly discharged from industrial effluents. Catalytic ozonation holds great potential in removing phenolic pollutants and further improving the removal efficiency is still the research focus of this field. In this study, defect engineering was used to construct Bi 2 O 3 with rich oxygen vacancies (denoted as O v -Bi 2 O 3 ). O v -Bi 2 O 3 was found to exhibit efficient activity toward the removal of phenolic derivatives. Combined DFT calculations and experimental results suggest that oxygen vacancies play two important roles: (1) the exposed Bi sites induced by rich oxygen vacancies endow a special bridging O 3 adsorption, which is beneficial to improve the kinetics of O 3 decomposition; (2) O 2 produced during the O 3 decomposition process can be reutilized to generate 1 O 2 , which prolongs the utilization efficiency of O 3 . In addition, O v -Bi 2 O 3 was loaded onto carbon fiber, which also demonstrates efficient activity. This work provides an alternative way to design efficient catalysts toward removal of phenolic pollutants via ozone oxidation.

Highly efficient, selective, and stable photocatalytic methane coupling to ethane enabled by lattice oxygen looping

“…In the meantime, Bi 4f XPS spectra dominantly show the characteristic peaks of oxidized Bi 3+ species in BiO x NCs (fig. S11), together with secondary metallic Bi signals ( 27 , 28 ). To be specific, the Bi 4f peaks blueshift toward higher BEs after Au deposition, indicative of further electron transfer from BiO x to Au.…”

Defect Engineered Microcrystalline Cellulose for Enhanced Cocatalyst‐Free Piezo‐Catalytic H2 Production

“…[28] As shown in Figure 2c, the g factor observed at 2.005 illustrated the unpaired electrons precisely trapped by the defect in the raw MCC and MCC-200 sample. [23][24][25][26][27][28][29] MCC-200 has stronger EPR signal than the counterpart of raw MCC sample, indicating that high temperature calcination treatment of MCC can produce a great many defects on MCC. In most cases, heat treatment of the piezocatalytic materials can release oxygen from the crystal lattice to create an oxygen vacancy defect.…”

The roles of the oxygen vacancies caused by the ion doping method in catalytic materials and their applications in advanced oxidation processes

“…123,124 The OVs on the catalyst have the ability to accelerate the activation of two oxygen monomers in catalytic ozonation: they can facilitate the adsorption of O 3 , thus accelerating the activation of O 3 to HO and O 2 À ; additionally, O 2 can be activated by OVs to produce 1 O 2 , providing an additional source of reactive oxygen species. 125 They basically play the role of adsorption sites as well as electron donors in these processes, which is further complicated when dopants are present. 126 Lots of researchers have proved excellent adsorption and facilitated decomposition of O 3 by OVs.…”