Hydroxylamine Promoted Goethite Surface Fenton Degradation of Organic Pollutants

Abstract

In this study, we construct a surface Fenton system with hydroxylamine (NHOH), goethite (α-FeOOH), and HO (α-FeOOH-HA/HO) to degrade various organic pollutants including dyes (methyl orange, methylene blue, and rhodamine B), pesticides (pentachlorophenol, alachlor, and atrazine), and antibiotics (tetracycline, chloramphenicol, and lincomycin) at pH 5.0. In this surface Fenton system, the presence of NHOH could greatly promote the HO decomposition on the α-FeOOH surface to produce ·OH without releasing any detectable iron ions during the alachlor degradation, which was different from some previously reported heterogeneous Fenton counterparts. Moreover, the ·OH generation rate constant of this surface Fenton system was 10-10 times those of previous heterogeneous Fenton processes. The interaction between α-FeOOH and NHOH was investigated with using attenuated total reflectance Fourier transform infrared spectroscopy and density functional theory calculations. The effective degradation of organic pollutants in this surface Fenton system was ascribed to the efficient Fe(III)/Fe(II) cycle on the α-FeOOH surface promoted by NHOH, which was confirmed by X-ray photoelectron spectroscopy analysis. The degradation intermediates and mineralization of alachlor in this surface Fenton system were then systematically investigated using total organic carbon and ion chromatography, liquid chromatography-mass spectrometry, and gas chromatography-mass spectrometry. This study offers a new strategy to degrade organic pollutants and also sheds light on the environmental effects of goethite.

Heterogeneous activation of peroxymonosulfate for bisphenol AF degradation with BiOI0.5Cl0.5

“…Previous researches had shown that F À in the solution could desorb $OH bound on catalyst by forming strong uorideexchange. 67,68 As expected in Fig. 10(b) and S9(a), † the addition of F À improved the BPAF degradation and with the more NaF dosage, the more obvious of the PMS degradation effect, the degradation rate of PMS increased 18.20% compared with BiOI 0.5 Cl 0.5 /PMS/BPAF system.…”

Elimination of 4‐chlorophenol in aqueous solution by the Novel Pd/MIL‐101(Cr)‐Hydrogen‐Accelerated catalytic fenton system

“…In previous studies, the organic reductants, such as hydroxylamine, ascorbate and thioglycolic acid, was used to improve the reduction process of Fe III back to Fe II . And quinones and humic acid could also be used as redox mediators which create an intermediate electron‐shuttling cycle between Fe III and H 2 O 2 (electron donor).…”

Management of wilt disease of chickpea in vivo by silver nanoparticles biosynthesized by rhizospheric microflora of chickpea (Cicer arietinum)

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