Contrasting impacts of chemical and physical ageing on hydrochar properties and sorption of norfloxacin with coexisting Cu2+

Guan, Junjie; Liu, Yuyan; Jing, Fanqi; Rong, Yue; Chen, Jiawei

doi:10.1016/j.scitotenv.2021.145502

Cited by 23 publications

(9 citation statements)

References 57 publications

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“…The sorption capacity of hydrochar increased after chemical aging because of increased C-OR bonds and oxygenated functional groups (Liu et al 2019b). It has also been shown that oxygenated functional groups increase after physical aging (Guan et al 2021). Hua et al (2020) also found that the sorption performance of biologically aged wheat straw hydrochar for Cd was better because of the enhanced functional group complexation, surface electrostatic interaction, ion exchange, and coordination (Hua et al 2020).…”

Section: Introductionmentioning

confidence: 98%

“…The HTC solid product hydrochar has received particular attention in various fields, such as soil amendment and energy production (Khiari et al 2019). Moreover, hydrochar as a soil amendment also has various benefits in improving carbon sequestration, contaminant immobilization, and overall soil quality and fertility (Guan et al 2021). Therefore, hydrochar may be used as a green material to promote sustainable remediation (Wang et al 2021b).…”

Section: Introductionmentioning

confidence: 99%

“…Recent studies have focused mainly on pyrochar natural aging (Yi et al 2020) and artificial aging of hydrochar, including physical aging (Hou et al 2021), chemical aging (Wang et al 2022), and biological aging (Hua et al 2020). Compared with physical aging (freeze-thaw cycles or high temperature), chemical aging, e.g., acidification or oxidation, has more substantial effects on the physicochemical properties (elemental composition, ash content, (O + N)/C, O abundance, and dissolved organic matter of plant-derived hydrochar (Guan et al 2021). The sorption capacity of hydrochar increased after chemical aging because of increased C-OR bonds and oxygenated functional groups (Liu et al 2019b).…”

Section: Introductionmentioning

confidence: 99%

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Unraveling natural aging-induced properties change of sludge-derived hydrochar and enhanced cadmium sorption site heterogeneity

Wang

Shang

Xie

et al. 2022

Biochar

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Hydrochar has potential applications in soil improvement and heavy metal remediation. Hydrochar would undergo the process of aging when introduced into the soil, altering its properties. However, recent studies have focused mainly on the artificial aging of hydrochar, which could not reveal the cumulative effect of multiple environmental factors. Therefore, the periodical monitoring of the property and sorption behavior of hydrochar after amending soils is necessary to better understand the multifaceted mechanisms associated with the natural aging of hydrochar. This study selected the sludge-derived hydrochar (SLHC) as a typical hydrochar and applied a 16-month rice–wheat–rice rotation to mimic the natural aging of hydrochar, focusing on changing properties and cadmium (Cd) sorption and literature contrast between aging strategies and biochar types. The porosity, O abundance, and ash content of 16-month aged SLHC increased by 37%, 47%, and 8.5%, respectively, facilitating Cd sorption due to surface complexation, pore sorption, and precipitation. The sorption percentage of Cd to SLHC was in the range of 11–14% for SLHC-A0 and increased to 17–31% for SLHC-A4 and 20–32% for SLHC-A16 after natural aging. The natural aging of SLHC induced by ash content played an essential role in Cd sorption site heterogeneity. Linear regression analysis showed that aging strategies on sorption behavior significantly differed between biochars. Thus, studies involving natural aging with multiple environmental factors are preferred over those involving chemical or biological aging. Future studies should continue to explore the mechanisms of natural aging-induced heavy metal sorption between hydrochar and pyrochar. These results improve insights to appraise the potential of SLHC as soil amendments to alleviate the adverse effects of heavy metal contamination and provide an essential basis for researchers and staff in soil management and environmental prevention. Graphical Abstract

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Unraveling natural aging-induced properties change of sludge-derived hydrochar and enhanced cadmium sorption site heterogeneity

Wang

Shang

Xie

et al. 2022

Biochar

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“…Many studies reported the preparation of engineered hydrochar by HTC followed by chemical treatments/activation (e.g., acid or alkaline treatment) which results in further improvement of their physicochemical characteristics. 414,434,449 The acid activation is done using various types of acids such as HNO 3 , 450,451 H 2 SO 4 , 450,452 HCl, 417,453,454 and H 3 PO 4 . 422 The alkaline treatment of hydrothermally carbonized materials is mainly carried out using KOH 422,454 and NaOH.…”

Section: Integrated Chemical Treatment For Production Of Carbonaceous...mentioning

confidence: 99%

“…422 The alkaline treatment of hydrothermally carbonized materials is mainly carried out using KOH 422,454 and NaOH. 455,456 Other chemical activation agents which are commonly applied to the hydrothermally processed carbon-based materials include H 2 O 2 , 429,453 polyethylenimine, 416,433 magnetization by treatment with FeCl 3 , 417,422 etc. Chemical reagents are considered as functionalization agents.…”

Section: Integrated Chemical Treatment For Production Of Carbonaceous...mentioning

confidence: 99%

Hydrothermal Treatment of Biomass Feedstocks for Sustainable Production of Chemicals, Fuels, and Materials: Progress and Perspectives

et al. 2023

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Hydrothermal process is an emerging technology that contributes to sustainable production of biomass-derived chemicals, fuels, and materials. This technology uses hot compressed water to convert various biomass feedstocks including recalcitrant organic compounds in biowastes into desired solid, liquid, and gaseous products. In recent years, considerable progress has been made in the hydrothermal conversion of lignocellulosic as well as nonlignocellulosic biomass to value-added products and bioenergy to fulfill the principles of circular economy. However, it is important to assess hydrothermal processes in terms of their capabilities and limitations from different sustainability aspects so that further advances can be made toward improvement of their technical maturity and commercialization potential. The key aims of this comprehensive review are to (a) explain the inherent properties of biomass feedstocks and physio-chemical characteristics of their bioproducts, (b) elucidate related transformation pathways, (c) clarify the role of hydrothermal process for biomass conversion, (d) evaluate the capability of hydrothermal treatment coupled with other technologies for producing novel chemicals, fuels and materials, (e) explore different sustainability assessments of hydrothermal processes for potential large-scale applications, and (f) offer our perspectives to facilitate the transition from a primarily petro-based to an alternative biobased society in the context of changing climate.

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Effect of hydrothermal temperature on the optical properties of hydrochar-derived dissolved organic matter and their interactions with copper (II)

Ji,

Yu,

Cao

et al. 2024

Biochar

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Hydrothermal carbonization (HTC) has been regarded as a promising technique for turning wet biomass into hydrochar due to its low energy consumption, low exhaust gas emissions, etc. In addition, hydrochar is an important source of dissolved organic matter (DOM), which plays a crucial part in the migration and destiny of pollutants in the environmental medium. However, there are limited studies that focus on the factors that influence the formation of DOM in hydrochar, such as hydrothermal temperature. Therefore, the current study comprehensively characterized the optical properties of DOM within hydrochar derived from sawdust (HDOM) under different hydrothermal temperatures (150–300 °C) by Ultraviolet–visible (UV–Vis) and fluorescence spectroscopy, as well as its complexation characteristic with Cu(II). The findings revealed that the organic carbon content of HDOM reached a peak of 37.3 mg L−1 when the temperature rose to 240 °C and then decreased as the temperature increased. UV–Vis spectroscopy analysis showed that the absorption capacity of HDOM at 275 nm increases with temperature and reaches a maximum value at 240 °C, indicating that high temperature promotes the formation of monocyclic aromatic compounds. High temperature enhances the aromaticity, hydrophobicity, and humification degree of HDOM, thus improving its stability and aromaticity. The E3/E4 ratios are all greater than 3.5, confirming that the main component of HDOM is fulvic acid, which corresponds to 3D-EEM and Pearson's correlation coefficient analysis. The humification index (HIX) of HDOM increased with the rise in hydrothermal temperature (150–240 °C), as observed by the three-dimensional excitation-emission matrix spectroscopy (3D-EEMs). After reaching its peak at 240 °C, the HIX value gradually dropped in line with the trend of the DOC change. Moreover, the bioavailability (BIX) value of DOM was all high and greater than 1, indicating all the HDOM are readily bioavailable. Two microbial humic substances (C1 and C4), a humic-like substance (C2), and a protein-like substance (C3) were discovered in DOM by integrating 3D-EEMs with parallel factor analysis (PARAFAC). Their fluorescence intensity decreases as the Cu(II) concentration increases, indicating the formation of complexes with Cu(II). As the temperature rises, the binding ability of DOM and Cu(II) changes significantly, reaching the optimum at 300 °C. Meanwhile, the substance C2 has the strongest binding ability with Cu(II). This research emphasizes the significance of spectroscopy analysis in determining the evolution of hydrochar-derived DOM, the potential for heavy metal binding and migration, and its characteristics and features. Graphical Abstract

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Contrasting impacts of chemical and physical ageing on hydrochar properties and sorption of norfloxacin with coexisting Cu2+

Cited by 23 publications

References 57 publications

Unraveling natural aging-induced properties change of sludge-derived hydrochar and enhanced cadmium sorption site heterogeneity

Unraveling natural aging-induced properties change of sludge-derived hydrochar and enhanced cadmium sorption site heterogeneity

Hydrothermal Treatment of Biomass Feedstocks for Sustainable Production of Chemicals, Fuels, and Materials: Progress and Perspectives

Effect of hydrothermal temperature on the optical properties of hydrochar-derived dissolved organic matter and their interactions with copper (II)

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