Synthesis of magnetically separable MnO2/Fe3O4/silica nanofiber composite with enhanced Fenton-like catalytic activity for degradation of Acid Red 73

MnO2‐Based Materials for Environmental Applications

“…MnO 2 ‐based materials have shown enormous potential applications in the removal of organic pollutants in various wastewater treatment technologies, including adsorption, catalytic ozonation, photocatalytic oxidation, electrocatalytic oxidation, peroxymonosulfate oxidation, catalytic filtration, and energy harvesting galvanic cell technologies. So far, MnO 2 ‐based materials have shown superior performances in the removal of various organic pollutants in water, such as dye (methylene blue, [ 359–361 ] methyl orange, [ 362,363 ] Rhodamine B, [ 309,364 ] Congo red, [ 365 ] acid fuchsin dye, [ 218 ] crystal violet dye, [ 366 ] acid red 73, [ 367 ] neutral red, [ 368 ] and tartrazin yellow [ 369 ] ), phenolic pharmaceuticals (phenol, [ 66,325,342,370–372 ] bisphenol A, [ 99,275,373–378 ] ibuprofen, [ 295 ] tetrabromobisphenol A, [ 379 ] benzophenone‐3, [ 216 ] 2,4‐dichlorophenol, [ 380 ] 4‐chlorophenol, [ 381 ] and 4‐nitrophenol [ 382 ] ), antibiotics (tetracycline, [ 383 ] ceftiofur, [ 243 ] and lomefloxacin [ 243 ] ), as well as ammonia borane, [ 384 ] amides, [ 385 ] lignin, [ 386 ] peroxymonosulfate, [ 237 ] 17 β‐Estradiol, [ 249 ] m ‐aminophenol, [ 387 ] carbamazepine, [ 388 ] dichloroacetic acid, [ 389 ] p ‐arsanilic acid, [ 390 ] phenylarsonic acids, [ 391 ] m ‐cresol, [ 288 ] oxalic acid, [ 392 ] ciprofloxacin, [ 393,394 ] phenanthrene, [ 246 ] norfloxacin, [ 291 ] etc. ( Table 2 ).…”

High-Efficiency Catalysis of Peroxymonosulfate by MgO for the Degradation of Organic Pollutants

“…Many results show that the smaller the size of the catalyst particles, the larger the specific surface area, the more surface defects and the higher the catalytic activity [43]. The X-ray photoelectron spectroscopy (XPS) provides information about elemental composition and valence state of sample surface [19,44], so the XPS was used to study above three kinds of MgO with different particle sizes. Figure 7 shows the XPS spectra of MgO at 50 nm (a and b), MgO at 1 µm (c and d), and MgO at 10 µm (e and f).…”

“…Liu's group catalyzed PMS by supporting Fe 3 O 4 nanoparticles and nanoflower-like MnO 2 layer by layer on the surface of porous diatomite or silica nanofiber. The high specific area of the core-shell nanocomposites made it easier for PMS and organic pollutants to contact with the catalysts, and the synergistic effect between MnO 2 and Fe 3 O 4 increased the activation performance of the catalysts [8,19,20]. Huang's group reported iron-copper bimetal doped mesoporous g-Al 2 O 3 catalyzed PMS to effectively degrade 4-chlorophenol, finding that the Al-O-Fe and Al-O-Cu bonds formed by Fe and Cu doping into the framework of g-Al 2 O 3 were the key structures for high activity of the catalyst [21].…”

A novel carbon nanotube–magnesium oxide composite with excellent recyclability to efficiently activate peroxymonosulfate for Rhodamine B degradation

“…Among the developed activation methods, transitional metal-containing catalysts (e.g., M = Ag, Fe, Mn, Co, and V) were considered as promising routes without energy inputs [as presented in Eq. 2] [10,11]. Although transition metal-containing catalysts have achieved good degradation efficiency, their practical applications are limited because of the secondary pollution of dissolved transition metals in the process [12,13].…”