Efficient removal of 17α-ethinylestradiol (EE2) from water using freshly formed Fe–Mn binary oxide

Jiang, Liying; Gu, Youli; Guo, Haiqian; Liu, Lu; Chen, Jianmeng

doi:10.1039/c7ra02022h

Cited by 31 publications

(4 citation statements)

References 59 publications

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“…The Mn 2p 1/2 and Mn 2p 3/2 peaks at 654.5 and 642.8 eV with a spin energy separation of 11.7 eV was assigned to be the 2p binding energy of Mn(IV) and it matched well with the characteristic peaks of MnO 2 . Meanwhile, the Mn 2p 1/2 and Mn 2p 3/2 peaks at 653.9 and 642.2 eV with a spin energy separation of 11.7 eV was assigned to be the 2p binding energy of Mn(II) and matches well with the characteristic peaks of jacobsite MnFe 2 O 4 40,41. The broad peak of O 1s can be tted by two peaks at binding energies of 530.0 eV and 531.4 eV inFig.…”

supporting

confidence: 54%

The preparation of a novel iron/manganese binary oxide for the efficient removal of hexavalent chromium [Cr(vi)] from aqueous solutions

Yang

Tiantian²,

Wang

et al. 2020

RSC Adv.

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supporting

confidence: 54%

The preparation of a novel iron/manganese binary oxide for the efficient removal of hexavalent chromium [Cr(vi)] from aqueous solutions

Yang

Tiantian²,

Wang

et al. 2020

RSC Adv.

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“…Furthermore, a significant correlation existed between effluent proteins and EE2 for all size fractions; it may be because those hydrophobic proteinaceous colloids (which are represented by Al-PACl-pDADMAC complex) provide binding sites for EE2 and washout together into the effluent. Another explanation is revealed by Jiang et al [25], suggesting that EE2 was adsorbed through hydrogen bonding, proved by Fourier transform infrared and X-ray photoelectron spectroscopies. It is obvious that changing B value is influencing the efficiency of both; PASiC and PACSi coagulants (Fig.…”

Section: Treatment Of Model Water (Mow)mentioning

confidence: 89%

Investigation of Coagulation/Flocculation Process for the Removal of Specific Micro-Pollutants

Alnahhas,

Tzoupanos,

Barjenbruch

2023

International Conference on Environmental Science and Applications

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The potential of coagulation/flocculation process for the removal of the selected pharmaceuticals SIbuprofen, Diclofenac, Carbamazepine, Valsartan, and Ethinylestradiol was investigated. For this purpose, several composite coagulants were prepared in the laboratory from the combination of polymerized aluminium (PACl) and an inorganic additive (polysilicates, pSi) and an organic positively charged additive (p-DADMAC). By applying two synthesis methods (co-polymerization and composite polymerization) and different basicities or [OH]/[Al] ratios, several products were produced. The prepared coagulants (of PASiC, PACSi and PACL-pDADMAC type) were characterised by means of basic properties such as pH, turbidity, conductivity. Moreover, the impact of the synthesis process with the different additives and conditions on the Al species distribution was studied. The treatment efficiency was studied by using model tap water after adding 1 mg/L of each compound. Several jar-tests were conducted, and the final concentrations of IBU, CBZ, IBF, DCF and VLS were determined by HPLC-UV/DAD. It was revealed that the composite polymerization results in more efficient coagulants than the Co-polymerization method. PACSi was the best one, achieving up to 90 % removal of Ethinylestradiol 90 %, 80% both Ibuprofen and Diclofenac, while 60% Valsartan, and only 10% Carbamazepine. The basicity has a strong impact on the efficiency, with the [OH]/[Al] = 1 achieving the best results, whereas the increase of the [OH]/[Al] to 1.5 and 2 reduced the performance significantly. pH and dose were adjusted to achieve the best removal efficiency and it was 6 and 10 ppm respectively.

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“…We are unaware of previous studies that consider the impact of mechanistic changes or compound-specific effects in phenol mixtures reacted with Mn oxides. Second, the oxidation of phenols by Mn oxides typically generates phenolic oxidation products; ,,− competition between parent compounds and their products may partially explain changes in oxidation rates or sorption as the reaction proceeds . Finally, model compound studies may provide insight into the reactivity of dissolved organic matter (DOM) with Mn oxides because this complex mixture contains numerous phenolic moieties. , High-resolution mass spectrometry analysis of DOM demonstrates that lignin-like molecules, which are typically electron-rich and likely phenolic in nature, are selectively oxidized by Mn oxides. , …”

Section: Introductionmentioning

confidence: 99%

Enhancement and Inhibition of Oxidation in Phenolic Compound Mixtures with Manganese Oxides

2022

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Phenolic compounds can be oxidized by manganese oxides in the subsurface or during passive treatment of stormwater runoff and wastewater effluent. Contaminated waters may contain a complex mixture of phenolic compounds, and these mixtures may have additive, synergistic, or antagonistic toxicological effects. However, the effects of such mixtures on the rates and mechanisms of phenol oxidation by manganese oxides are not well understood. This study addresses this knowledge gap by determining pseudo-first-order oxidation rates and oxidation mechanisms for four phenols reacted with δ-MnO2 in varying mixtures. Oxidation rates of electron transfer-limited phenols (i.e., triclosan, resorcinol, bisphenol A) are inhibited in mixtures. This inhibition, as well as the observed decrease in sorption, is consistent with competition between phenols occurring near the Mn surface. In contrast, the oxidation rate and extent of sorption for sorption-limited 4,4′-biphenol are enhanced in mixtures. The rate enhancement is partially driven by indirect oxidation through radical-mediated reactions, likely from phenoxy radicals produced when electron transfer-limited phenols react with δ-MnO2. These findings demonstrate that mixtures have a large impact on phenol oxidation by manganese oxides, as the electron transfer-limited phenols are inhibited due to competition interactions and the sorption-limited phenol has increased oxidation rates due to indirect oxidation by radicals and enhanced sorption.

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Efficient removal of 17α-ethinylestradiol (EE2) from water using freshly formed Fe–Mn binary oxide

Abstract: The removal mechanism of EE2: adsorption onto FMBO through hydrogen bonding and then oxidation by MnO2.

Cited by 31 publications

References 59 publications

The preparation of a novel iron/manganese binary oxide for the efficient removal of hexavalent chromium [Cr(vi)] from aqueous solutions

The preparation of a novel iron/manganese binary oxide for the efficient removal of hexavalent chromium [Cr(vi)] from aqueous solutions

Investigation of Coagulation/Flocculation Process for the Removal of Specific Micro-Pollutants

Enhancement and Inhibition of Oxidation in Phenolic Compound Mixtures with Manganese Oxides

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