Adsorptive fractionation of dissolved organic matter (DOM) by carbon nanotubes

Engel, Maya; Chefetz, Benny

doi:10.1016/j.envpol.2014.11.020

Cited by 37 publications

(19 citation statements)

References 56 publications

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“…The SUVA254 measurements are in line with recent studies showing that sorption of DOM to PyC particles increases with DOM aromaticity and can be hindered by steric effects excluding very large DOM molecules from reaching certain sorption sites within the charcoal particles. 19,45 PARAFAC, a modelling approach used to unravel chemical signatures from EEMs, resulted in the detection of 4 components (see Fig. 4 and OpenFluor PARAFAC report (https://openfluor.lablicate.com/of/measurement/2604)).…”

Section: Pyrogenic Carbon Addition Changes Dom Compositionmentioning

confidence: 99%

Wildfire-Derived Pyrogenic Carbon Modulates Organic Matter and Microbial Functioning in a Fluvial Ecosystem

Bistarelli¹,

Poyntner²,

Santín³

et al. 2021

Preprint

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Wildfires produce large amounts of pyrogenic carbon (PyC), including particulate charcoal, known for its chemical recalcitrance and sorption affinity for organic molecules. Wildfire-derived PyC is highly mobile in the landscape and can be transported to fluvial networks where it may impact natural dissolved organic matter (DOM) and microbial biofilms. The effects of PyC on freshwater ecosystems and carbon cycling therein remain poorly investigated. To address this research gap, we used in-stream flumes with a control vs treatment design (pulse addition of PyC particles). We present evidence that field-aged PyC inputs into river ecosystems can alter dissolved organic carbon (DOC) concentration, DOM composition, pH, and enzymatic activities in benthic biofilms. In stream DOM composition was altered due to leaching of pyrogenic DOM from PyC and possible concurrent sorption of riverine DOM to PyC. DOM changes and increase in pH were associated with changes in enzymatic activities, which reflected preferential usageof recalcitrant over easily available DOM by biofilms. Furthermore, we observed particulate PyC sedimentation on biofilm surfaces, which may further modulate the impacts of PyC. This study highlights the importance of PyC for in-stream DOM propertiesand biofilm functioning with implications for in-stream biogeochemical cycling in fire affected watersheds. <br>

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Section: Pyrogenic Carbon Addition Changes Dom Compositionmentioning

confidence: 99%

Wildfire-Derived Pyrogenic Carbon Modulates Organic Matter and Microbial Functioning in a Fluvial Ecosystem

Bistarelli¹,

Poyntner²,

Santín³

et al. 2021

Preprint

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show abstract

“…[24][25][26][27][28][29] When nanomaterials react with NOMs, the nanotoxicity may be weakened, such as the toxicity of TiO 2 nanoparticles to Chlorella sp., nanoscale zero valent iron and Ag nanoparticles towards Escherichia coli. In these studies, nanomaterials were regarded as efficient absorbents, coagulants and occulants to remove organic matters and metal ions.…”

Section: Introductionmentioning

confidence: 99%

Mitigation in the toxicity of graphene oxide nanosheets towards Escherichia coli in the presence of humic acid

Zhang

Sui

Yan

et al. 2016

Environ. Sci.: Processes Impacts

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GO nanosheets have been reported to show strong cytotoxicity towards Escherichia coli (E. coli) in aqueous solution. Natural organic matters (NOMs) in water may probably coat on the surface of GO nanosheets, which possibly influence its cytotoxicity. In this study, we illustrated how humic acid (HA), a ubiquitous NOM, mitigated the toxicity of GO nanosheets towards E. coli based on the cytotoxicity mechanism of GO nanosheets. Adsorption and cell viability tests proved that HA was adsorbed by GO nanosheets and decreased the toxicity of GO nanosheets towards E. coli. It was found that HA was adsorbed on the surface of GO nanosheets by polar groups, which prevented E. coli from contacting with GO nanosheets and weakened the toxicity of GO nanosheets. Besides, HA exerted an antioxidant role in maintaining the activity of the antioxidant enzyme and decreasing the ROS generation according to the results of oxidative stress experiments. The work revealed that HA relieved the toxicity of GO nanosheets and decreased the ecological risks induced by GO nanosheets.

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“…2.6 represents an enrichment in the two neutral fractions, HiN in the Hanlon system and HoN in the Zook system. Preferential adsorption of the hydrophobic fraction of DOM has been reported for forest soils (Kaiser et al, 1996), clay soil (Avneri-Katz et al, 2017), and single-walled carbon nanotubes (Engel and Chefetz, 2015).…”

Section: Bulk Bdom Adsorption To Hanlon and Zook Soil Samplesmentioning

confidence: 98%

“…The hydrophilic neutral fraction (HiN) has been reported to be composed of polysaccharide moieties, and the hydrophilic base fraction (HiB) was composed of proteins and amino acid complexes (Chefetz et al, 1998b;Imai et al, 2002). (1991) Some researchers have previously studied the interactions of DOM with soil samples or other adsorptive materials, e.g., DOM extracted from different soil horizons (Kothawala et al, 2012), fulvic and humic acids from soils and surface water and their interaction to goethite (Kaiser, 2003), and DOM extracted from composted biosolids and its interaction with clayey soil (Avneri-Katz et al, 2017) and to single-walled carbon nanotube (Engel and Chefetz, 2015). Previous studies have used a variety of different experimental set-ups and analytical methods for characterization of the adsorbed and non-adsorbed fractions of DOM.…”

Section: Introductionmentioning

confidence: 99%

“…The model parameters Qsat and K were calculated to determine the predicted maximum adsorption capacity and the adsorption intensity, respectively. -derived dissolved organic matter fractionation (BDOM)The fractionation procedure used was modified from the procedure of Leenheer (1981),Chefetz et al (1998),Engel and Chefetz (2015), and Avneri-Katz et al(2016). The bulk DOM samples were fractionated into five fractions based on their hydrophobicity: hydrophobic acid (HoA), hydrophobic neutral (HoN), hydrophilic acid (HiA), hydrophilic base (HiB), and hydrophilic neutral (HiN).Control BDOM samples were fractionated at two different times: first as a control sample before the BDOM sample was adsorbed to the Hanlon soil material, and second as a control sample before the BDOM sample was adsorbed to the Zook soil material.…”

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confidence: 99%

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The role of biosolids-derived dissolved organic matter on the interaction of selected endocrine-disrupting chemicals with two alluvial soils

Rivas

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Adsorptive fractionation of dissolved organic matter (DOM) by carbon nanotubes

Cited by 37 publications

References 56 publications

Wildfire-Derived Pyrogenic Carbon Modulates Organic Matter and Microbial Functioning in a Fluvial Ecosystem

Wildfire-Derived Pyrogenic Carbon Modulates Organic Matter and Microbial Functioning in a Fluvial Ecosystem

Mitigation in the toxicity of graphene oxide nanosheets towards Escherichia coli in the presence of humic acid

The role of biosolids-derived dissolved organic matter on the interaction of selected endocrine-disrupting chemicals with two alluvial soils

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