Preparation of a novel manganese oxide-modified diatomite and its aniline removal mechanism from solution

High-efficiency adsorption and regeneration of methylene blue and aniline onto activated carbon from waste edible fungus residue and its possible mechanism

“…Aer adsorption of MB, the peak around 3386 cm À1 caused by O-H stretching vibration was broadened and the peak intensity was enhanced, indicating that the hydroxyl groups on the EFAC surface and -CH 2 of MB formed hydrogen bonds, and MB were adsorbed to EFAC under the action of hydrogen bonding. 37 Aer aniline was adsorbed, the O-H peak became narrower and the peak intensity decreased, which may be caused by the consumption of hydroxyl groups during the adsorption process. The C]O peak at 1153 cm À1 became weaker in MEFAC but almost unchanged in AEFAC, this may be attributed to the higher affinity of the C]O functions towards MB compared with the aniline.…”

Arsenite removal from groundwater by iron–manganese oxides filter media: Behavior and mechanism

“…The peak at 1,625 cm −1 corresponds to the vibration of water molecules in the structure, indicating the physical adsorption of water in the Fe–Mn oxides (Zhang et al., ). The peaks at 3,277 and 905 cm −1 correspond to the vibration of the hydroxyl ion and Fe–OH, respectively (Jiang, Liu, Xiao, & Chen, ; Tiwari & Lee, ). After the reaction with As(III), the peak at 905 cm −1 gradually disappeared, with a new peak appearing at 997 cm −1 , resulting from the interaction between arsenic species and Fe–OH.…”

“…The O1s spectra of the Fe–Mn oxides filter media before and after the reaction with As(III) were further analyzed (Figure e,f). The obtained spectra were deconvoluted into three different oxygen bonding configurations, namely Mn–O–Mn oxide (surface lattice oxygen species) bonding at 530.3 eV, Mn–OH hydroxyl bond (hydroxide) at 531.2 eV, and H–O–H molecule (water molecules) at 532.1 eV (Batis et al., ; Chang & Tsai, ; Jiang et al., ; Sharma, Rastogi, & Desu, ). The ratio of surface lattice oxygen species to hydroxide was 52.73:29.72 before the reaction.…”

Direct fabrication of lamellar self-supporting Co3O4/N/C peroxymonosulfate activation catalysts for effective aniline degradation

“…As mentioned above, Å OH and SO 4 -Å radicals are likely the two primary active oxidizing species generated by decomposition of PMS [89,90]. In the beginning of the reaction, aniline is first transformed to aniline radical and 4-amino-phenol by the attack of Å OH and SO 4 -Å radicals and yield either benzoquinonimine or nitrobenzene [91,92]. The oxidation of benzoquinonimine produced p-benzoquinone.…”