Self-Generation of Reactive Oxygen Species on Crystalline AgBiO₃ for the Oxidative Remediation of Organic Pollutants

Abstract

In this study, we synthesized a novel perovskite nanomaterial consisting of AgBiO nanoparticles (NPs) via an ion-exchange method for remediation of polluted environments. The AgBiO NPs could self-produce significant amounts of reactive oxygen species (ROS) without light illumination or any other additional oxidant due to the controllable release of lattice oxygen from the crystalline AgBiO, resulting in the formation of ROS somehow. The self-produced O, O, and OH were confirmed by electron spin resonance spectroscopy using a spin trap technique. We found that the AgBiO NPs could be reused for the mineraliztion of most recalcitrant organic compounds alone, including Rhodamine B (RhB), phenol, 4-chlorophenol, 2,4-dichlorophenol, and bisphenol A. After the repeated eight cycles of continious treatment of RhB, AgBiO NPs still achieved 79% of degradation after 30 min of treatment. Characterization results revealved that the lattice oxygen inside AgBiO was activated to form active oxygen (O*), which resulted in consecutive formation of ROS. This study provides new insight on the lattice oxygen activation mechanism of silver bismuthate and its application to the remediation of polluted waters.

Rational Regulation of Surface Free Radicals on TiO2 Nanotube Arrays via Ag2O–AgBiO3 towards Enhanced Selective Photoelectrochemical Detection

“…In general, the Bi element mainly shows three valence forms, namely zero, trivalent, and pentavalent. Here, by comparing the value of binding energy and previous studies, it can be concluded that the existing valence state of the Bi element synthesized by this precipitation method is a positive pentavalent ion (Bi 5+ cations), which is consistent with the results observed in the above-mentioned SEM [ 26 , 34 ]. In the Ag 3d XPS spectrum shown in Figure 2 c, the peaks at ~373.4 eV and ~367.4 eV can be attributed to Ag 3d 3/2 and Ag 3d 5/2 .…”

“…In the Ag 3d XPS spectrum shown in Figure 2 c, the peaks at ~373.4 eV and ~367.4 eV can be attributed to Ag 3d 3/2 and Ag 3d 5/2 . Furthermore, each peak can be analyzed into two peaks, where the peaks at 373.4 eV and 367.4 eV correspond to Ag ions in the AgBiO 3 phase [ 34 ], while those at 374.1 eV and 368.1 eV are assigned to the Ag ion in the Ag 2 O phase [ 35 , 36 ], indicating that both AgBiO 3 and Ag 2 O are formed from the precipitation reaction. Moreover, the XPS of the O 1s transition includes four distinct peaks ( Figure 2 d), that is, the peak at 529.7 eV is due to Ti-O (lattice oxygen), while the 530.4 eV and 532.3 eV peaks are in response to the Bi-O and C-O bonding structures, respectively.…”

Electronic, Optical, Mechanical and Lattice Dynamical Properties of MgBi2O6: A First-Principles Study

“…For example, NaBiO 3 has been found to show the absorption of visible light and can be used as a prominent material for photooxidation of organics [13]. A recent work by Gong et al [14] shows that AgBiO 3 can self-produce significant amounts of reactive oxygen species without light illumination or any other additional oxidant and has an excellent oxidizing reactivity. BaBiO 3 , as one kind of Bi-based oxides containing Bi 3+ and Bi 5+ mixed valent states, has been found to show the potential use for the absorber of all-oxide photovoltaics [15] and can be an active photocatalyst under visible-light irradiation [16].…”

Insight into Different Mechanisms for Oxidation of Liquid and Gaseous Pollutants by Bi−NaBiO3 with or without Visible Light Illumination

“…[24][25][26] Recently, our group and several authors also find a new series of bismuth based materials, such as NaBiO 3 and AgBiO 3 . [27,28] According to these studies, it is usually assuming that the lattice oxygen released from the [BiO 6 ] 2À layer in bismuth based materials are responsible for the excellent photocatalytic property and self-oxidation ability. [29][30][31] However, the stability of those materials are dissatisfied and the actual degradation mechanism is unclear yet.…”