Catalytic Removal of Aqueous Contaminants on N-Doped Graphitic Biochars: Inherent Roles of Adsorption and Nonradical Mechanisms

Environmental Science & Technology, Journal Year: 2018, Volume and Issue: 52(15), P. 8649 - 8658

Published: July 20, 2018

Environmentally friendly and low-cost catalysts are important for the rapid mineralization of organic contaminants in powerful advanced oxidation processes (AOPs). In this study, we reported N-doped graphitic biochars (N-BCs) as efficient peroxydisulfate (PDS) activation degradation diverse pollutants water treatment, including Orange G, phenol, sulfamethoxazole, bisphenol A. The at high annealing temperatures (>700 °C) presented highly nanosheets, large specific surface areas (SSAs), rich doped nitrogen. particular, N-BC derived 900 °C (N-BC900) exhibited highest rate, which was 39-fold 6.5-fold that on N-BC400 pristine biochar, respectively, N-BC900 surpassed most popular metal or nanocarbon catalysts. Different from radical-based N-BC400/PDS via persistent free radicals (PFRs), singlet oxygen nonradical pathways (surface-confined activated persulfate–carbon complexes) were discovered to dominate N-BC900/PDS. Moreover, adsorption organics determined be key step determining reaction revealing pre-adsorption reactants significantly accelerated pathway. This study not only provides robust cheap carbonaceous materials environmental remediation but also enables first insight into biochar-based catalysis.

Language: Английский

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Black Carbon (Biochar) In Water/Soil Environments: Molecular Structure, Sorption, Stability, and Potential Risk

Environmental Science & Technology, Journal Year: 2017, Volume and Issue: 51(23), P. 13517 - 13532

Published: Nov. 8, 2017

Black carbon (BC) is ubiquitous in the environments and participates various biogeochemical processes. Both positive negative effects of BC (especially biochar) on ecosystem have been identified, which are mainly derived from its diverse physicochemical properties. Nevertheless, few studies systematically examined linkage between evolution molecular structure with resulted properties, environmental functions as well potential risk, critical for understanding behavior utilization a multifunctional product. Thus, this review highlights during pyrolysis impact properties sorption behavior, stability, risk terrestrial aqueous ecosystems. Given wide application important role processes, future research should focus following: (1) establishing methodology to more precisely predict design basis phase transformation biomass; (2) developing an assessment system evaluate long-term effect stabilization bioavailability contaminants, agrochemicals, nutrient elements soils; (3) elucidating interaction mechanisms plant roots, microorganisms, soil components.

Language: Английский

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Biochar stability assessment methods: A review

The Science of The Total Environment, Journal Year: 2018, Volume and Issue: 647, P. 210 - 222

Published: July 30, 2018

Language: Английский

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Multifunctional iron-biochar composites for the removal of potentially toxic elements, inherent cations, and hetero-chloride from hydraulic fracturing wastewater

Environment International, Journal Year: 2019, Volume and Issue: 124, P. 521 - 532

Published: Jan. 25, 2019

This paper evaluates a novel sorbent for the removal of potentially toxic elements, inherent cations, and hetero-chloride from hydraulic fracturing wastewater (FWW). A series iron-biochar (Fe-BC) composites with different Fe/BC impregnation mass ratios (0.5:1, 1:1, 2:1) were prepared by mixing forestry wood waste-derived BC powder an aqueous FeCl3 solution subsequently pyrolyzing them at 1000 °C in N2-purged tubular furnace. The porosity, surface morphology, crystalline structure, interfacial chemical behavior Fe-BC characterized, revealing that Fe chelated CO bonds as COFe moieties on surface, which reduced to CC bond nanoscale zerovalent (nZVI) during pyrolysis. performance was evaluated simultaneous elements (Cu(II), Cr(VI), Zn(II), As(V)), cations (K, Na, Ca, Mg, Ba, Sr), (1,1,2-trichlorethane (1,1,2-TCA)), total organic carbon (TOC) high-salinity (233 g L-1 dissolved solids (TDS)) model FWW. By elucidating mechanisms contaminants, we demonstrated (1:1) had optimal reducing/charge-transfer reactivity owing homogenous distribution nZVI highest Fe0/Fe2+ ratio. lower content (0.5:1) resulted rapid exhaustion Fe0, while higher (2:1) caused severe aggregation oxidization contributing its complexation/(co-)precipitation Fe2+/Fe3+. All synthesized exhibited high capacity (3.2-7.2 g-1) FWW through bridging cation-π interactions. Overall, this study illustrated potential efficacy mechanistic roles (pre-)treatment complex

Language: Английский

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Biochar Aging: Mechanisms, Physicochemical Changes, Assessment, And Implications for Field Applications

Environmental Science & Technology, Journal Year: 2020, Volume and Issue: 54(23), P. 14797 - 14814

Published: Nov. 3, 2020

Biochar has triggered a black gold rush in environmental studies as carbon-rich material with well-developed porous structure and tunable functionality. While much attention been placed on its apparent ability to store carbon the ground, immobilize soil pollutants, improve fertility, temporally evolving situ performance these roles must not be overlooked. After field application, various factors, such temperature variations, precipitation events microbial activities, can lead fragmentation, dissolution, oxidation, thus causing drastic changes physicochemical properties. Direct monitoring of biochar-amended soils provide good evidence temporal evolution, but this requires long-term trials. Various artificial aging methods, chemical wet–dry cycling mineral modification, have therefore designed mimic natural mechanisms. Here we evaluate science biochar aging, critically summarize aging-induced properties, offer state-of-the-art for simulation approaches. In addition, implications are also considered regarding potential development deployment amendment. We suggest that improved prediction, methods shift from qualitative quantitative Furthermore, preaging may serve synthesize engineered biochars green sustainable applications.

Language: Английский

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An overview of the effect of pyrolysis process parameters on biochar stability

Bioresource Technology, Journal Year: 2018, Volume and Issue: 270, P. 627 - 642

Published: Sept. 7, 2018

Language: Английский

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Single and competitive sorption properties and mechanism of functionalized biochar for removing sulfonamide antibiotics from water

Chemical Engineering Journal, Journal Year: 2016, Volume and Issue: 311, P. 348 - 358

Published: Nov. 16, 2016

Language: Английский

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Review on biomass feedstocks, pyrolysis mechanism and physicochemical properties of biochar: State-of-the-art framework to speed up vision of circular bioeconomy

Journal of Cleaner Production, Journal Year: 2021, Volume and Issue: 297, P. 126645 - 126645

Published: March 9, 2021

Language: Английский

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The role of biochar properties in influencing the sorption and desorption of Pb(II), Cd(II) and As(III) in aqueous solution

Journal of Cleaner Production, Journal Year: 2017, Volume and Issue: 148, P. 127 - 136

Published: Jan. 25, 2017

Language: Английский

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Biochar’s stability and effect on the content, composition and turnover of soil organic carbon

Geoderma, Journal Year: 2020, Volume and Issue: 364, P. 114184 - 114184

Published: Jan. 22, 2020

Language: Английский

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