Granular reduced graphene oxide/Fe3O4 hydrogel for efficient adsorption and catalytic oxidation of p-perfluorous nonenoxybenzene sulfonate

Wang, Wei; Cao, Ying; Hu, Xue; Zhou, Shuangxi; Zhu, Donghai; Qi, Di; Deng, Shubo

doi:10.1016/j.jhazmat.2019.121662

Cited by 37 publications

(17 citation statements)

References 37 publications

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“…Therefore, how to achieve the effective collision between oxidants and targets may greatly affect the final selectivity. As for the adsorption-assisted selective oxidation, additional adsorption sites are always created to realize the selective adsorption of targets, which are usually separated from the catalytic sites. − Theoretically, it could be imagined that the selectivity be affected by the distance between both sites as well as the adsorption affinity. Ghosh-Mukerji et al separated the adsorption sites (i.e., molecularly recognizable β-cyclodextrin decorated on Au stripe) and the catalytic sites on TiO 2 .…”

Section: Selective Oxidation Via Tuning the Accessibility Of Targets ...mentioning

confidence: 99%

Toward Selective Oxidation of Contaminants in Aqueous Systems

Yang

Qian

Shan

et al. 2021

Environ. Sci. Technol.

208

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The presence of diverse pollutants in water has been threating human health and aquatic ecosystems on a global scale. For more than a century, chemical oxidation using strongly oxidizing species was one of the most effective technologies to destruct pollutants and to ensure a safe and clean water supply. However, the removal of increasing amount of pollutants with higher structural complexity, especially the emerging micropollutants with trace concentrations in the complicated water matrix, requires excessive dosage of oxidant and/ or energy input, resulting in a low cost-effectiveness and possible secondary pollution. Consequently, it is of practical significance but scientifically challenging to achieve selective oxidation of pollutants of interest for water decontamination. Currently, there are a variety of examples concerning selective oxidation of pollutants in aqueous systems. However, a systematic understanding of the relationship between the origin of selectivity and its applicable water treatment scenarios, as well as the rational design of catalyst for selective catalytic oxidation, is still lacking. In this critical review, we summarize the state-of-the-art selective oxidation strategies in water decontamination and probe the origins of selectivity, that is, the selectivity resulting from the reactivity of either oxidants or target pollutants, the selectivity arising from the accessibility of pollutants to oxidants via adsorption and size exclusion, as well as the selectivity due to the interfacial electron transfer process and enzymatic oxidation. Finally, the challenges and perspectives are briefly outlined to stimulate future discussion and interest on selective oxidation for water decontamination, particularly toward application in real scenarios.

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Section: Selective Oxidation Via Tuning the Accessibility Of Targets ...mentioning

confidence: 99%

Toward Selective Oxidation of Contaminants in Aqueous Systems

Yang

Qian

Shan

et al. 2021

Environ. Sci. Technol.

208

View full text Add to dashboard Cite

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“…Suspect analysis was conducted by a suspect list scan, which contained common PFASs and published transformation products of OBS (Table S5). , However, the common process used for PFAS annotation including suspect analysis and homologue analysis was verified ineffective in finding the products in the UV/SF process given the complexity of the OBS molecule and the unknown mechanism. Thus, we applied univariate statistical analysis to prioritize the potential transformation products.…”

Section: Resultsmentioning

confidence: 99%

Degradation of OBS (Sodium p-Perfluorous Nonenoxybenzenesulfonate) as a Novel Per- and Polyfluoroalkyl Substance by UV/Persulfate and UV/Sulfite: Fluorinated Intermediates and Treatability in Fluoroprotein Foam

Liu

Deng

Bao

et al. 2022

Environ. Sci. Technol.

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Sodium p-perfluorous nonenoxybenzenesulfonate (OBS) is a novel fluorosurfactant used as the alternative to perfluorooctanesulfonic acid (PFOS) in several applications such as fire-fighting foams and chemical enhanced oil recovery (“EOR”) in China, with the annual production capacity of about 3,500 t. Here, for the first time, we investigated the degradability of OBS under the conditions of UV/persulfate (UV/PS) and UV/sulfite (UV/SF) as typical redox processes. A higher reaction rate (1.05 min–1) and total organic carbon (TOC) reduction (46.9%) but a low defluorination rate (27.6%) along with the formation of a series of fluorinated intermediates were found in UV/PS, while a high defluorination rate (87.7%) was realized in UV/SF. In particular, a nontargeted workflow using high performance liquid chromatography-quadrupole time-of-flight mass spectrometry (HPLC/Q-TOF-MS) was established to detect fluorinated intermediates. Combined with the theoretical calculation, the distinctive degradation pathways in both oxidation and reduction processes were proposed. The degradation mechanism of OBS in UV/SF was proposed to be H/F exchange and subsequent HF elimination. Furthermore, the diluted OBS-based fluoroprotein (FP) foam was used to investigate the degradation of OBS, which confirms the treatability using the redox approach. This work provides insights into the degradability of OBS, fluorinated intermediate search, and proper treatment of related contamination.

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“…The nonlinear indicator n values for both OBS (9.66) and HFPO-TA (5.20) calculated based on the Freundlich model were much higher than 1, suggesting multiple adsorption interactions involved in the adsorption processes. According to the Langmuir fitting, CTF2/Fe 3 O 4 had maximum adsorption capacities of 1.18 mmol g −1 for OBS and 1.02 mmol g −1 for HFPO-TA, much higher than those of various modified activated carbons 6 and 3D-reduced GO 40 for OBS adsorption. The removal of OBS and HFPO-TA at different solution pH and ion strength values was evaluated (Fig.…”

Section: Adsorption Behaviormentioning

confidence: 95%