Biochar and activated carbons preparation from invasive algae Sargassum spp. for Chlordecone availability reduction in contaminated soils

Organochlorine POPs sequestration strategy by carbonaceous amendments of contaminated soils: Toward a better understanding of the transfer reduction to laying hens

“…Currently, few data exist in the literature concerning halogenated POPs transfer reduction to animals using such carbonaceous material as soil amendment. Similar reduction levels were reported when using biochars and ACs amendment of a CLD contaminated soil for piglets (36% reduction using biochar, 54-89% reduction using ACs) (Feidt et al, 2021). For PCBs, PCDD/Fs, direct adsorption prior ingestion of biochars or ACs (without soil) was proven to limit drastically the bioavailability of these compounds to rodents (95-99% reduction) (Boyd et al, 2017, Sallach et al, 2019, far more than found in the present study.…”

“…The obtained dendrogram also highlights that AC or BC porosity properties are the most cleaving characteristics of all to classify pairs of carbonaceous matrices and pollutants. Such results confirm on a larger set of POPs first investigations which evidenced that micro and mesoporosity volumes are of first importance to limit POP transfer as assess for CLD contaminated soil through in vitro (Ranguin et al, 2021, Ranguin et al, 2020 and in vivo (Feidt et al, 2021) assays. Then, it appears that the chemical characteristics of the studied molecules explain the following obtained classification levels by discriminating: (i) Light PCDD/Fs (L-DFs); (ii) heavy PCDD/Fs (H-DFs); (iii) PCB 28 as Light NDL-PCB-(L-NDL-PCB) (iv) CLD along with heavy NDL-PCBs (H-NDL-PCBs) and PCB 77.…”

Assessment of an NDL-PCBs Sequestration Strategy in Soil Using Contrasted Carbonaceous Materials through In Vitro and Cucurbita pepo Assays

“…For AC materials, AC2 and AC3 were the most effective in reducing PCB concentrations given their larger specific surface area and mesoporous surface, while AC1 was less effective due to its granular shape. This result confirms that surface properties and textural characteristics impact the sorption properties of carbonaceous materials in contaminated soils [11,12,14,26,27]. Regarding the type of pollutants, no difference could be shown in terms of sequestration efficiency by the different carbonaceous materials probably because the physicochemical properties related to adsorption in soil such as lipophilicity are of the same order (about log Kow of 7).…”

“…However, such data is lacking for other POPs, and also for plants known to accumulate halogenated POPs inside their aerial parts like Cucurbitaceae family. Activated carbons (ACs) amendment showed also a reduction up to 90% in non-physiological based in vitro environmental availability assays [12,14]. Some studies reported the ability of activated carbons and biochars to trap and reduce the transfer of pesticides, PCBs and other organic pollutants in cucurbits [15][16][17][18][19].…”

Sargassum in Mexico: from environmental problem to valuable resource

“…Pelagic Sargassum chemical composition opens the opportunity to develop new nanostructured tailored materials for multiple applications, such as energy generation [142,143], medicine [144], antibacterial agents [145,146], and environmental remediation tools [147,148]. Recently, nanocarbons materials have been produced from brown sargassum for their use in electrochemical systems such fuel cells as [142] and supercapacitors [149], where the algae was activated at different temperatures presenting high specific surface areas <2500 m 2 /g.…”