Protonated Hydroxylamine‐Assisted Iron Catalytic Activation of Persulfate for the Rapid Removal of Persistent Organics from Wastewater. Issue 3 (17th July 2022)

• Record Type: Journal Article
• Authors: Merouani, Slimane; Dehane, Aissa; Belghit, Aouattef; Hamdaoui, Oualid; Tobba, Yasser A.; Lahlou, Chouaib; Shah, Maulin P.
• Other Names: Shah Maulin P. guestEditor.; Rodriguez Couto Susana guestEditor.
• Is Part Of: Clean. Volume 51:Issue 3(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-07-17
• Subjects: degradation -- Fe(II)/KPS/H3NOH+ process -- radicals -- textile wastewater -- water quality; Water quality -- Periodicals; Water -- Pollution -- Periodicals; Pollution -- Periodicals; Bioremediation -- Periodicals; Sewage -- Periodicals; Water chemistry -- Periodicals; 333.7205
• DOI: 10.1002/clen.202100304
• Languages: English
• ISSNs: 1863-0650

Abstract

Abstract: This research aims at optimizing the effects of processing conditions, salts, natural organic materials, and water matrices quality on the effectiveness of the Fe(II)/K2 S2 O8 /hydroxylamine process in the degradation of pararosaniline. Assisting the Fe(II)/KPS (potassium persulfate) treatment with protonated hydroxylamine (H3 NOH + ) increases the degradation rate of pararosaniline by more than 100%. Radical scavenger experiments show that the SO4 ●− radical dominates pararosaniline degradation in the Fe(II)/KPS system, whereas ● OH is the dominant reactive species in the presence of H3 NOH + . The disparity in pararosaniline removal effectiveness upon the Fe(II)/KPS/H3 NOH + and Fe(II)/KPS systems gets more significant with increasing reactants doses (i.e., H3 NOH +, H2 O2, Fe(II)) and solution pH (2–7). Interestingly, H3 NOH + increased the working pH to 6 instead of pH 4 for the Fe(II)/KPS process. Moreover, mineral anions such as Cl −, NO3 −, NO2 −, and SO4 − (up to 10 × 10 −3 m ) do not affect the efficiency of the Fe(II)/KPS/H3 NOH + process. In contrast, acid humic decreases the performance of the process by ≈20%. In natural mineral water, treated wastewater, and river water samples, the Fe(II)/KPS/H3 NOH + process maintains higher degradation performance (≈95%), whereas the process efficiency is greatly amortized in seawater. The efficiency of the Fe(II)/KPS process was drastically decreased in the various water matrices. Abstract : Protonated hydroxylamine (H3 NOH + ) is an efficient accelerator of the Fe(III)/Fe(II) redox cycle. It exhibits significant promotion of the degradation of pararosaniline by the Fe(II)/persulfate system. Addition of H3 NOH + results in an increase of the working pH for the Fe(II)/persulfate system up to pH 6. The efficiency of the Fe(II)/persulfate/H3 NOH + ternary system is high in various water matrices.