Redox properties of nano-sized biochar derived from wheat straw biochar

Wu, Shiyin; Cai, Xiaoyan; Liao, Zhiyang; He, Wenjie; Shen, Junhua; Yuan, Yong; Ning, Xun‐an

doi:10.1039/d2ra01211a

Cited by 19 publications

(8 citation statements)

References 64 publications

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“…Improving soil organic carbon (SOC) reinforces soil‐physiochemical functioning while restoring the C‐balance (Zheng et al, 2020), soil pH, CEC, and nutrient availability (Leng, Huang, et al, 2019; Leng, Xu, et al, 2019; Miao & Li, 2021; Xu et al, 2019; Zhang et al, 2017; Zhang, Liu, et al, 2021; Zhang, Zhang, et al, 2021). Normally bulk‐BCs contains a smaller proportion of nano‐sized particulates (about 15%), which effectively contribute to better surface adsorption characteristics (Chen, Meng, et al, 2019; Chen, Zhang, et al, 2019; Liu et al, 2021; Wu et al, 2022). The primary focus of this review article is to discuss Nano‐BC which is a completely different material from bulk‐BC (reviewed by Song et al, 2022).…”

Section: Biochar Characteristicsmentioning

confidence: 99%

“…Nano‐BC can be synthesized from waste plant biomass, crop residues, and various feedstock materials, making it an eco‐friendly, value‐added product. The fluorescence, elemental, and surface characteristics of biochar nanoparticles vary depending on the feedstock materials and synthesis techniques (Plácido et al, 2019; Ramanayaka, Tsang, et al, 2020; Ramanayaka, Vithanage, et al, 2020; Weber & Quicker, 2018; Wu et al, 2022). In general, particle sizes differentiate bulk‐BCs (0.04–20 mm) and nano‐BCs (diameter < 100 nm) and their properties may vary accordingly (Chen et al, 2018; Lian et al, 2019; Liu, Zheng, Jiang, et al, 2018; Liu, Zheng, Zhai, & Wang, 2018).…”

Section: Nano‐biochar: Insights Into the Structural Functional And El...mentioning

confidence: 99%

“…This favors the soil microbial activity of bacterivores and fungivores and facilitates root growth (Jien & Wang, 2013). In addition, the redox‐active sites of biochar surface could be involved in electron shuttling by microbes affecting biochar fracture particles and releasing nutrients to promote root growth (Kappler et al, 2014; Wu et al, 2022). It is pertinent to mention here that both bulk‐BC and nano‐BC addition to the soil stimulated biological N‐fixation in the soil by affecting microbial abundance, particularly of diazotrophs community structure inhabiting alkaline soils (Kuzyakov et al, 2009; Liu, Liu, et al, 2019; Liu, Tan, et al, 2019; Smith et al, 2010).…”

Section: Agricultural Perspectivementioning

confidence: 99%

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Nano‐biochar: Properties and prospects for sustainable agriculture

et al. 2023

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Biochar is an extremely valuable carbon black material used since the Pre‐Columbian Era in Latin America and is known for its properties to promote soil fertility and sustain crop production. Modern civilization has followed the footsteps of ancient civilizations and has prepared nano‐sized biochar (nano‐BC). The synthesis of nano‐BC can be achieved using different feedstock materials via pyrolysis, yielding bulk‐BCs which are mechanical transformed into the nano‐BCs, the final value‐added product. This review provides insights into structural, functional, and elemental properties concerning synthesis, surface properties including functional groups, and carbon stability. Moreover, the prospects of improving soil physicochemical properties including CEC, nutrient availability, soil water retention, and buffering capacity are discussed with agricultural implications. Mechanistic insights have been provided regarding how nano‐BC can improve soil health and could promote plant growth and physio‐biochemical properties, which further pave the way for its application to improve plant resilience to abiotic stress factors. Last, limited studies have been conducted that elucidate potential negative effects including contaminant mobilization and residual effects and these are also critically discussed. Above all, nano‐BC could be used as a beneficial soil amendment to boost crop production and enhance soil fertilities.

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Section: Biochar Characteristicsmentioning

confidence: 99%

Section: Nano‐biochar: Insights Into the Structural Functional And El...mentioning

confidence: 99%

Section: Agricultural Perspectivementioning

confidence: 99%

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Nano‐biochar: Properties and prospects for sustainable agriculture

et al. 2023

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“…As an important part of biochar, biochar nanoparticles (BC-NP) have attracted much attention due to their wide application in adsorbents, sensors, capacitors, and photocatalytic materials (Tan et al, 2016;Ramanayaka et al, 2020;Zhang et al, 2022). However, these small biochar particles are reactive and could leach into surface water and soil profile via runoff, irrigation, and infiltration (Ramanayaka et al, 2020;Wu et al, 2022). BC-NP may contain organic pollutants (Song et al, 2019) and have a high adsorption affinity for environmental pollutants (Naghdi et al, 2019;Swaren et al, 2022), facilitating transport or co-transport with pollutants to the groundwater system, which could result in potential environmental risks (Lian et al, 2020;Swaren et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Effects of soil grain size and solution chemistry on the transport of biochar nanoparticles

Zhang

Meng

Huang

et al. 2023

Front. Environ. Sci.

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Biochar nanoparticles (BC-NP) have attracted significant attention because of their unique environmental behavior, some of which could potentially limit large-scale field application of biochar. Accurate prediction of the fate and transportability of BC-NP in soil matrix is the key to evaluating their environmental influence. This study investigated the effects of soil grain size and environmentally relevant solution chemistry, such as ionic strength (cation concentration, 0.1 mM–50 mM; cation type, Na+, and Ca2+), and humic acid (HA; 0–10 mg/L), on the transport behavior of BC-NP via systematic column experiments. The transportability of BC-NP in the soil-packed column decreased with decreasing soil grain size and was inversely proportional to soil clay content. At low cation concentrations (0.1–1.0 mM), a considerable proportion of BC-NP (15.95%–67.17%) penetrated the soil columns. Compared with Na+, Ca2+ inhibited the transportability of BC-NP in the soil through a charge shielding effect. With increasing HA concentration, the transportability of BC-NP increased, likely due to an enhanced repulsion force between BC-NP and soil particles. However, at a high HA concentration (10 mg/L), Ca2+ bridging reduced the transportability of BC-NP in the soil. Breakthrough curves of BC-NP were explained by the two-site kinetic retention model. The antagonistic effects of ionic strength and HA indicated that the transport behavior of BC-NP in the soil was governed by competitive effects of some environmental factors, including soil grain size, environmental solution chemistry, and natural organic matter content.

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“…23 BC is a porous carbon-rich material produced by anaerobic pyrolysis of biomass and has a strong stability. 24,25 Because of its large specic surface area, well-developed pore structure, ion exchange capacity, and rich surface functional groups such as carboxyl, phenolic hydroxyl, carbonyl, and quinonyl functional groups, BC is no longer only conned to the promotion of crop growth and productivity but has been applied for the remediation of contaminated environments. [26][27][28] Therefore, BC has become a research hotspot in recent years and one of the best modifying materials to remove potentially toxic elements.…”

Section: Introductionmentioning

confidence: 99%