Stabilisation of nanoscale zero-valent iron with biochar for enhanced transport and in-situ remediation of hexavalent chromium in soil

Su, Huijie; Fang, Zhanqiang; Tsang, Eric Pokeung; Fang, Jianzhang; Zhao, Dongye

doi:10.1016/j.envpol.2016.03.072

Cited by 250 publications

(52 citation statements)

References 26 publications

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“…The adsorption band at 1120 cm −1 corresponded to the stretching vibration of the C-O bond. The signal at 592 cm −1 was the Fe-O adsorption peak, which indicated that the nZVI was oxidized on the BC [36]. These functional groups were believed to play a crucial role in the adsorption of ONZ and the support of nZVI.…”

Section: Namementioning

confidence: 99%

“…These functional groups were believed to play a crucial role in the adsorption of ONZ and the support of nZVI. These functional groups immobilized nZVI and reduced the electrostatic attraction with nZVI [36]. A previous study indicated that nitroimidazoles can be adsorbed onto organic matter through interactions between the π electrons in the aromatic rings [37].…”

Section: Namementioning

confidence: 99%

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Fenton-Like Oxidation of Antibiotic Ornidazole Using Biochar-Supported Nanoscale Zero-Valent Iron as Heterogeneous Hydrogen Peroxide Activator

Zhang

Zhao

Yang

et al. 2020

IJERPH

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Biochar (BC)-supported nanoscale zero-valent iron (nZVI-BC) was investigated as a heterogeneous Fenton-like activator to degrade the antibiotic ornidazole (ONZ). The characterization of nZVI-BC indicated that BC could enhance the adsorption of ONZ and reduce the aggregation of nZVI. Thus, nZVI-BC had a higher removal efficiency (80.1%) than nZVI and BC. The effects of parameters such as the nZVI/BC mass ratio, pH, H 2 O 2 concentration, nZVI-BC dose, and temperature were systematically investigated, and the removal of ONZ followed a pseudo-second-order kinetic model. Finally, possible pathways of ONZ in the oxidation process were proposed. The removal mechanism included the adsorption of ONZ onto the surface of nZVI-BC, the generation of •OH by the reaction of nZVI with H 2 O 2 , and the oxidation of ONZ. Recycling experiments indicated that the nZVI-BC/H 2 O 2 system is a promising alternative for the treatment of wastewater containing ONZ.

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Section: Namementioning

confidence: 99%

Section: Namementioning

confidence: 99%

Fenton-Like Oxidation of Antibiotic Ornidazole Using Biochar-Supported Nanoscale Zero-Valent Iron as Heterogeneous Hydrogen Peroxide Activator

Zhang

Zhao

Yang

et al. 2020

IJERPH

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“…The mechanisms for higher As removal capacities by modified biochar included more adsorption sites for arsenic(V) removal, ligand exchange between As(V) anion, the hydroxylated surface, and H bond (Wang et al 2016(Wang et al , 2017dYoon et al 2017;Zhang et al 2016a;Zhou et al 2017c). Similarly, the most popular modification methods were Fe/Mn oxides and nanoscale zero-valent iron-supported biochars for Cr(VI) removal (Dong et al 2017;Duan et al 2017;Qian et al 2017;Su et al 2016;Wang et al 2017a). Greater electrostatic attraction and reduction capacity might be attributed to the higher removal of Cr(VI) by modified biochar (Han et al 2016b;Qian et al 2017;Su et al 2016).…”

Section: Heavy Metals' Immobilizationmentioning

confidence: 99%

A scientometric review of biochar research in the past 20 years (1998–2018)

Ata-Ul-Karim

Singh

et al. 2019

Biochar

169

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Biochar is the carbon-rich product obtained from the thermochemical conversion of biomass under oxygen-limited conditions. Biochar has attained extensive attention due to its agronomical and environmental benefits in agro-ecosystems. This work adopts the scientometric analysis method to assess the development trends of biochar research based on the literature data retrieved from the Web of Science over the period of 1998-2018. By analysing the basic characteristics of 6934 publications, we found that the number of publications grew rapidly since 2010. Based on a keyword analysis, it is concluded that scholars have had a fundamental recognition of biochar and preliminarily found that biochar application had agronomic and environmental benefits during the period of 1998-2010. The clustering results of keywords in documents published during 2011-2015 showed that the main research hotspots were "biochar production", "biochar and global climate change", "soil quality and plant growth", "organic pollutants removal", and "heavy metals immobilization". While in 2016-2018, beside these five main research hotspots, "biochar and composting" topic had also received greater attention, indicating that biochar utilization in organic solid waste composting is the current research hotspot. Moreover, updated reactors (e.g., microwave reactor, fixed-bed reactor, screw-feeding reactor, bubbling fluidized bed reactor, etc.) or technologies (e.g., solar pyrolysis, Thermo-Catalytic Reforming process, liquefaction technology, etc.) applied for efficient energy production and modified biochar for environmental remediation have been extensively studied recently. The findings may help the new researchers to seize the research frontier in the biochar field.

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“…3 As one of most toxic heavy metal elements in water, Cr(VI) could stay in the organism for a long period, resulting in a high risk of cancers, due to carcinogenicity, persistence, and bioaccumulation. 4,5 In general, Cr-containing sewage is oen derived from industry discharge, e.g. electroplating industry, textile industry, curriery, and metallurgy.…”

Section: Introductionmentioning

confidence: 99%

Effective removal of Cr(vi) from aqueous solution by biochar supported manganese sulfide

Zhang

Liu

et al. 2019

RSC Adv.

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In order to remove hexavalent chromium (Cr(VI)) efficiently and simplify the adsorbent preparation process, we employed a single step method to prepare a new biochar supported manganese sulfide material. The nanoscale MnS particles were highly soldered on the biochar support surface, and this adsorbent displayed the effective removal of Cr(VI) (98.15 mg L À1 ) via synergistic effect between adsorption and reduction/precipitation under weak acid conditions (pH ¼ 5.0-6.0). The adsorption kinetic data were described well by the pseudo second-order kinetic model, suggesting that the reaction process was a chemisorption process. The adsorption isotherm data were described well by the Redlich-Peterson model, further suggesting that this reaction was a hybrid chemical reaction-sorption process. In addition, the Dubinin-Radushkevich isotherm model with 8. 28, 8.57, and 12.91 kJ mol À1 adsorption energy also suggests that it was a chemisorption process. The simple and eco-friendly preparation process, lowcost, and the high removal efficiency could make it a promising material for the purification of Cr(VI)contaminated wastewater.

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Stabilisation of nanoscale zero-valent iron with biochar for enhanced transport and in-situ remediation of hexavalent chromium in soil

Cited by 250 publications

References 26 publications

Fenton-Like Oxidation of Antibiotic Ornidazole Using Biochar-Supported Nanoscale Zero-Valent Iron as Heterogeneous Hydrogen Peroxide Activator

Fenton-Like Oxidation of Antibiotic Ornidazole Using Biochar-Supported Nanoscale Zero-Valent Iron as Heterogeneous Hydrogen Peroxide Activator

A scientometric review of biochar research in the past 20 years (1998–2018)

Effective removal of Cr(vi) from aqueous solution by biochar supported manganese sulfide

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