Generating dual-active species by triple-atom sites through peroxymonosulfate activation for treating micropollutants in complex water

Abstract

The peroxymonosulfate (PMS)-triggered radical and nonradical active species can synergistically guarantee selectively removing micropollutants in complex wastewater; however, realizing this on heterogeneous metal-based catalysts with single active sites remains challenging due to insufficient electron cycle. Herein, we design asymmetric Co–O–Bi triple-atom sites in Co-doped Bi 2 O 2 CO 3 to facilitate PMS oxidation and reduction simultaneously by enhancing the electron transfer between the active sites. We propose that the asymmetric Co–O–Bi sites result in an electron density increase in the Bi sites and decrease in the Co sites, thereby PMS undergoes a reduction reaction to generate SO 4 •- and •OH at the Bi site and an oxidation reaction to generate 1 O 2 at the Co site. We suggest that the synergistic effect of SO 4 •- , •OH, and 1 O 2 enables efficient removal and mineralization of micropollutants without interference from organic and inorganic compounds under the environmental background. As a result, the Co-doped Bi 2 O 2 CO 3 achieves almost 99.3% sulfamethoxazole degradation in 3 min with a k-value as high as 82.95 min −1 M −1 , which is superior to the existing catalysts reported so far. This work provides a structural regulation of the active sites approach to control the catalytic function, which will guide the rational design of Fenton-like catalysts.

Nontarget Identification of Novel Organophosphorus Flame Retardants and Plasticizers in Rainfall Runoffs and Agricultural Soils around a Plastic Recycling Industrial Park

“…TPPO is refractory to biological degradation, but ultrasonic irradiation and the addition of radical promoters can promote its degradation in water. 89,90 The degradation products are typically more toxic than TPPO. 89 Previous studies have shown that reactions with OH radicals are the main atmospheric and aquatic loss processes of OPEs.…”

Current Mechanism of Peroxymonosulfate Activation by Cobalt-Based Heterogeneous Catalysts in Degrading Organic Compounds

“…Therefore, the composite material increases the activation site, and some sites also have the adsorption capacity of OCs. This can shorten the ROS migration distance and improve the degradation rate. ,,− Bimetallic catalysts can also adjust the valence state of Co and maintain continuous activity of the catalyst. In this context, we will mainly introduce the improvement of bimetallic composites mainly composed of Fe, Cu, Mn, and Ce compounds on the performance activated PMS by Co-based catalysts.…”

Microplastics Weaken the Adaptability of Cyanobacterium Synechococcus sp. to Ocean Warming

“…The global average surface temperature is increasing with continually increasing greenhouse gas emissions and will increase by nearly 4 °C by 2100 according to the Intergovernmental Panel on Climate Change (IPCC) . In addition, extreme climate events such as heat waves will increase dramatically and last longer in the future. , Thus, ocean warming (OW) has become a global threat to ocean ecosystems, which could influence the physiological variability of phytoplankton and thereby impact the primary production and carbon cycle of ocean ecosystems. − In addition, global warming can alter the environmental risk of anthropogenic contaminants, and, conversely, anthropogenic contaminants have the potential to increase the susceptibility of organisms to OW. − As emerging contaminants, plastics caused the global ocean problem that is attracting much attention. − Plastic pollution from anthropogenic activities in the ocean is increasing . More than 10 million tons of plastic debris were reported to be released into the marine environment each year. ,, The environmental concentration of microplastics (MPs, plastic debris <5 mm) can reach ∼>1000 particles/L − in open and coastal water and 76,000 particles/L in polluted coastal regions .…”