Degradation of sulfamethazine by biochar-supported bimetallic oxide/persulfate system in natural water: Performance and reaction mechanism

Qin, Fanzhi; Peng, Yijiao; Song, Ge; Fang, Qingxuan; Wang, Rongzhong; Zhang, Chen; Zeng, Guangming; Huang, Danlian; Lai, Cui; Zhou, Yaoyu; Tan, Xiaofei; Cheng, Min; Liu, Shiyu

doi:10.1016/j.jhazmat.2020.122816

Cited by 159 publications

(10 citation statements)

References 68 publications

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“…Previous studies added the active components (e.g., N dopants, sulfur, and Fe or Mn oxides) into biomass to prepare the functional BC, to explore this relationship with PS activation performance. ,− But the intrinsic components in biomass are complex and more practical to access. Sewage sludges, containing a large number of organic contaminants, pathogens as well as metals, have been widely converted to BCs for reducing the potential secondary pollution and improve their surplus values. ,,, The components in sewage sludge, affected by the natures of their treated wastewater, , are various and of a broad concentration range.…”

Section: Introductionmentioning

confidence: 99%

Determination of Instinct Components of Biomass on the Generation of Persistent Free Radicals (PFRs) as Critical Redox Sites in Pyrogenic Chars for Persulfate Activation

Zhu

Huang

et al. 2021

Environ. Sci. Technol.

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Persulfate (PS) activation on biochar (BC) is a promising technology for degrading the aqueous organic contaminants. However, the complexity of activation mechanisms and components in biomass that used to produce BC makes it difficult to predict the performance of PS activation. In this study, we employed eight sludges as the representative biomass that contained absolutely different organic or inorganic components. Results showed that the elemental composition, surface properties, and structures of the sludge-derived BCs (SBCs) clearly depended on the inherent components in the sludges. The intensities of persistent free radicals (PFRs) in the electron paramagnetic resonance (EPR) correlated positively with Ncontaining content of sludges as electron shuttle, but negatively with the metal content as electron acceptor. Linking with PFRs as crucial sites of triggering a radical reaction, a poly-parameter relationship of predicting PS activation for organic degradation using the sludge components was established (k obs,PN = 0.004 × C protein + 0.16 × C M −0.895 −0.118). However, for the PS activation on those SBCs without PFRs, this redox process only relied on the sorption or conductivity-related characteristics, not correlating with the content of intrinsic components in biomass but with pyrolysis temperatures. This study provided insightful information of predicting the remediation efficiency of PS activation on BCs and further understanding the fate of contaminants and stoichiometric efficiency of oxidants in a field application.

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Section: Introductionmentioning

confidence: 99%

Determination of Instinct Components of Biomass on the Generation of Persistent Free Radicals (PFRs) as Critical Redox Sites in Pyrogenic Chars for Persulfate Activation

Zhu

Huang

et al. 2021

Environ. Sci. Technol.

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“…According to Figure a,b, the k obs values of TC degradation in IBCs/PS and PBC/PS systems were significantly positively correlated with the PFR intensities and the consumed PFR intensities during the reaction process, and the correlation coefficients were 0.980 and 0.974, respectively. The lower correlation between the consumed PFR intensities and k obs values may be due to the fact that OFGs as redox sites were also involved in PS activation. , Moreover, positive correlation coefficients of 0.870 and 0.786 between the peak intensities of DMPO-OH & SO 4 and PFR intensities and the consumed PFR intensities within IBCs were also observed (Figure c,d). The correlation coefficients of 0.870 and 0.786 involving radical (·OH and SO 4 · – ) generation are lower than 0.980 and 0.974 involving k obs values of TC degradation.…”

Section: Resultsmentioning

confidence: 92%

Effects of Heterogeneous Metals on the Generation of Persistent Free Radicals as Critical Redox Sites in Iron-Containing Biochar for Persulfate Activation

et al. 2022

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Metal components have critical influences on the generation of persistent free radicals (PFRs) in biochar. However, little is known about the effect on the formation of PFRs brought about by interactions among metal components when pyrolyzing biomass containing multiple metal components (e.g., sewage sludges and hyperaccumulators) for biochar. Herein, iron-modified biochar (FeO/BC) and iron-containing bimetallic oxide-loaded biochar (ZnFeO/BC, CoFeO/BC, and NiFeO/BC) were prepared. Due to the synergistic effect, the coupling of Fe with Co and Ni further enhances the abundance of PFRs in iron-containing biochars (IBCs) compared with FeO/BC catalysts, while Zn inhibits the generation of PFRs via blocking the electron transfer process during biomass pyrolysis. Furthermore, persulfate activation experiments on IBCs were conducted, and a positive correlation coefficient of 0.980 (or 0.974) was found between k obs values and PFR intensities (or the consumption rate of PFRs), indicating that PFRs are doubtless the critical redox sites. Finally, NiFeO/BC as a more efficient catalyst for PS activation was confirmed due to the higher adsorption energy and more transferred electrons based on experimental results and theoretical calculations. This study provides new methods for regulating PFRs in biochar and updates the understanding about heterogeneous metal-containing biomass pyrolysis processes.

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“…Recently, a great attention has also been given to the development of AOPs based on persulfate activation, due to several inherent advantages of sulphate radicals such as (i) the convenience of storage and transportation of solid persulfate, (ii) the different way to activate persulfate (e.g. thermal or electrochemical processes, Fe 2+ ) and (iii) the longer lifetime of sulphate radicals compared to hydroxyl radicals [133][134][135][136][137].…”

Section: -Degradation Processes Iii1 -Biological Processesmentioning

confidence: 99%

Remediation of soils contaminated by hydrophobic organic compounds: How to recover extracting agents from soil washing solutions?

Trellu

Péchaud

Oturan

et al. 2021

Journal of Hazardous Materials

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A lot of soil (particularly, former industrial and military sites) has been contaminated by various highly toxic contaminants such as petroleum hydrocarbons, polycyclic aromatic hydrocarbons (PAHs), polychlorobiphenyls (PCBs) or chlorinated solvents. Soil remediation is now required for their promotion into new industrial or real estate activities. Therefore, the soil washing (SW) process enhanced by the use of extracting agents (EAs) such as surfactants or cyclodextrins (CDs) has been developed for the removal of hydrophobic organic compounds (HOCs) from contaminated soils. The use of extracting agents allows improving the transfer of HOCs from the soil-sorbed fraction to the washing solution. However, using large amount of extracting agents is also a critical drawback for cost-effectiveness of the SW process. The aim of this review is to examine how extracting agents might be recovered from SW solutions for reuse.Various separation processes are able to recover large amounts of extracting agents according to the physicochemical characteristics of target pollutants and extracting agents. However, an additional treatment step is required for the degradation of recovered pollutants. SW solutions

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Degradation of sulfamethazine by biochar-supported bimetallic oxide/persulfate system in natural water: Performance and reaction mechanism

Cited by 159 publications

References 68 publications

Determination of Instinct Components of Biomass on the Generation of Persistent Free Radicals (PFRs) as Critical Redox Sites in Pyrogenic Chars for Persulfate Activation

Determination of Instinct Components of Biomass on the Generation of Persistent Free Radicals (PFRs) as Critical Redox Sites in Pyrogenic Chars for Persulfate Activation

Effects of Heterogeneous Metals on the Generation of Persistent Free Radicals as Critical Redox Sites in Iron-Containing Biochar for Persulfate Activation

Remediation of soils contaminated by hydrophobic organic compounds: How to recover extracting agents from soil washing solutions?

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