Mass preparation of micro/nano-powders of biochar with water-dispersibility and their potential application

Li, Linjian; Zhang, Kun; Chen, Li; Huang, Zhong; Liu, Guangbin; Li, Mingfang; Wen, Yangping

doi:10.1039/c7nj00742f

Cited by 38 publications

(15 citation statements)

References 62 publications

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“…The nanoparticle catalyst was prepared by sequential steps of milling, sieving, centrifugation and filtration [15] . Initially, the powder samples were ground using a miller for 15 mins.…”

Section: Methodsmentioning

confidence: 99%

Co-transesterification of waste cooking oil, algal oil and dimethyl carbonate over sustainable nanoparticle catalysts

Hülsey

Yan

et al. 2021

Chemical Engineering Journal

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“…The nanoparticle catalyst was prepared by sequential steps of milling, sieving, centrifugation and filtration [15] . Initially, the powder samples were ground using a miller for 15 mins.…”

Section: Methodsmentioning

confidence: 99%

Co-transesterification of waste cooking oil, algal oil and dimethyl carbonate over sustainable nanoparticle catalysts

Hülsey

Yan

et al. 2021

Chemical Engineering Journal

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“…60 h) to yield nanosheets from layered materials. 18,27 With respect to biochar, exfoliation has been achieved using LPE, [28][29][30] as well as mechanochemical techniques 31,32 and chemical pre-treatment of biomass. 33,34 So far, the identification of high-performance solvents for LPE of biochar has not been studied.…”

Section: Introductionmentioning

confidence: 99%

Liquid-Phase Exfoliation of Biochars in Green Solvents and Correlation with Solvent Parameters

Vidal¹,

Connell²,

Connors³

et al. 2021

Preprint

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Liquid-phase exfoliation (LPE) is a process frequently used to yield small sheets of layered materials. These materials are prepared via direct or indirect sonication in an ideal solvent, and the sheets produced often present remarkable chemical and physical properties. Unfortunately, the preferred solvents for exfoliation processes are frequently toxic and possess several health risks. In this work, we show the use of LPE in green solvents to access nanostructures of biochar. Biochar is a material produced after thermochemical treatment of biomass residues and it is an important tool for the sequestration of greenhouse gases. Herein, hardwood and softwood biomass residues (e.g. sludge, bark, and sawdust) are used to prepare pristine and oxidized biochars which are then exfoliated in a range of solvents. Stable dispersions containing up to 75% by weight of exfoliated biochar could be obtained. A range of solvents were screened for LPE of biochars to identify ‘green' options that could afford highly concentrated dispersions. The properties of the biochar before and after exfoliation were evaluated using Raman spectroscopy and Transmission Electron Microscopy. Correlations between effective LPE of biochar in a solvent and different solvent parameters were established. For example, LPE of oxidized biochars is more efficient in hydrogen-bond accepting solvents due to the increased concentration of carboxylic acid and alcohol functional groups within this material, when compared with pristine biochars.<div><br></div>

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“…Recently, spherical carbon-rich colloids with a relatively high surface charge, so-called biochar colloids, have been extracted as a side product from pyrolyzed biomass via sonication (Wang et al 2013a, b;Oleszczuk et al 2016), acid/ base (Li et al 2017b), grinding (Li et al 2017a), and ball milling (Naghdi et al 2017;Lyu et al 2018;Wang et al 2018;Cao et al 2019). It has been suggested that biochar colloids originate from the physical disintegration of amorphous regions of bulk biochar with higher polar content and less aromatic structure (Qu et al 2016;Liu et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Biochar colloids and their use in contaminants removal

Safari

Gunten

Alam

et al. 2019

Biochar

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In this study, we report on the extraction, characterization, and potential applications of colloidal biochar derived from pyrolyzed wood-an untapped source of carbonaceous particles. A series of characterizations was performed on biochar colloids to unravel their colloidal properties and surface chemistry through which it was found that they have a net negative charge and are stable between pH 3 and 10. Moreover, our initial toxicity tests showed that biochar colloids themselves are not toxic and they can be used in remediation applications, which led us to investigate (1) their copper sorption, a model inorganic contaminant, in a scenario that biochar colloids are released into the environment and (2) their potential use in organic pollutants adsorption and degradation. Copper sorption studies showed that biochar colloids have a copper sorption capacity as high as 22 mg g −1 in sub-ppm copper solutions. This increased the acute 48 h lethal concentration (LC 50) of copper for Daphnia magna by 21 ppb, which is comparable to the previously reported effect by dissolved organic matter. Adsorption and degradation of methylene blue (MB), an often-used proxy for organic contaminants in water, were studied by coupling the biochar colloids to positively charged TiO 2 nanoparticles and using it as a photocatalyst. The hybrid MB photodegradation efficiency was 21% higher than that of TiO 2 nanoparticles alone. Enhancement of demethylation is proposed as the main degradation mechanism of MB, as confirmed by liquid chromatography-mass spectroscopy (LC/MS), and the positive impact of biochar colloids is ascribed to their abundant adsorption sites, which may facilitate MB adsorption and its photocatalytic degradation.

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Mass preparation of micro/nano-powders of biochar with water-dispersibility and their potential application

Abstract: A novel strategy for micro/nano-structural and/or water dispersible biochars and their potential application in new and traditional fields.

Cited by 38 publications

References 62 publications

Co-transesterification of waste cooking oil, algal oil and dimethyl carbonate over sustainable nanoparticle catalysts

Co-transesterification of waste cooking oil, algal oil and dimethyl carbonate over sustainable nanoparticle catalysts

Liquid-Phase Exfoliation of Biochars in Green Solvents and Correlation with Solvent Parameters

Biochar colloids and their use in contaminants removal

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