Metal-free boron-assisted Fe(III)/peracetic acid system for ultrafast removal of organic contaminants: Role of crystalline nature and interfacial suboxide boron intermediates

pH-Driven Efficacy of the Ferrate(VI)–Peracetic Acid System in Swift Sulfonamide Antibiotic Degradation: A Deep Dive into Active Species Evolution and Mechanistic Insights

“…Earlier research has documented the production of organic radicals (R–O•), such as CH 3 C­(O) O• and CH 3 C­(O) OO•, within the PAA-activated system, especially in the Fe­(VI)–PAA context under certain pH conditions. , Keen on discerning the participation of these R–O•, we used 2,4-hexadiene (2, 4-HD) as a quencher, given its vulnerability to peroxyl and acyl peroxyl radicals, thereby enabling us to elucidate the potential roles of these radicals . Intriguingly, introducing 2, 4-HD resulted in a notable inhibition of the Fe­(VI)–PAA system’s activity across varied pH conditions, underscoring the organic radicals’ substantial involvement across a broad pH spectrum.…”

“…In our quest to detect potential superoxide radicals (•O 2 − ) within the system, we utilized nitroblue tetrazolium (NBT) as a specific probe. 35 Monitoring the absorbance of NBT at 259 nm across a spectrum of pH levels, we observed consistent intensity levels throughout the reaction duration (Figure S7a 36,37 Keen on discerning the participation of these R−O•, we used 2,4-hexadiene (2, 4-HD) as a quencher, given its vulnerability to peroxyl and acyl peroxyl radicals, 38 thereby enabling us to elucidate the potential roles of these radicals. 39 Intriguingly, introducing 2, 4-HD resulted in a notable inhibition of the Fe(VI)−PAA system's activity across varied pH conditions, underscoring the organic radicals' substantial involvement across a broad pH spectrum.…”

Electron Donation from Boron Suboxides via Strong p–d Orbital Hybridization Boosts Molecular O2 Activation on Ru/TiO2 for Low-Temperature Dibromomethane Oxidation

“…The electronic property of RuB/Ti was characterized to reveal the intrinsic reason the low-temperature catalytic ability was improved. Figure b shows the B 1s X-ray photoelectron spectroscopy (XPS) of RuB/Ti with binding energy at 190.4 eV belonging to boron suboxides (BO x , where x < 3/2). , The charge of boron in the suboxides is between B 0 (∼187 eV) and B III (B 2 O 3 , 192–193 eV). , The BO x layer with bulk boron in the B–O bond covered on the Ru cluster as observed by TEM, forming the Ru–B bond at the interface (Figure d). According to the lowest energy principle, the suboxides BO x with nonbonding electrons tend to donate electrons to the adjacent site to meet the stable structure of B 2 O 3 with an empty B 2p orbital .…”

“…Figure 3b shows the B 1s X-ray photoelectron spectroscopy (XPS) of RuB/Ti with binding energy at 190.4 eV belonging to boron suboxides (BO x , where x < 3/2). 28,29 The charge of boron in the suboxides is between B 0 (∼187 eV) 30 and B III (B 2 O 3 , 192−193 eV). 24,27 The BO x layer with bulk boron in the B−O bond covered on the Ru cluster as observed by TEM, forming the Ru−B bond 31 at the interface (Figure 3d).…”

Enhanced Fe(ii)/Fe(iii) cycle by boron enabled efficient Cr(vi) removal with microscale zero-valent iron

“…20 Furthermore, boron was demonstrated to be active for Fe(II) regeneration in Fenton-like peroxydisulfate and peracetic acid activation. 21,22 Moreover, many boron-containing compounds were also developed to improve the efficiency of the iron cycle. [23][24][25][26][27][28][29] In the periodic table, the specic electronic conguration (1s 2 2s 2 2p 1 ) of the metalloid element boron usually endows boron with high affinity to the metalloid and metal elements.…”