Sorption of bisphenol A, 17α-ethinyl estradiol and phenanthrene on thermally and hydrothermally produced biochars

Sorption of phenanthrene and benzene on differently structural kerogen: Important role of micropore-filling

“…2B). Such correlation was also observed for some hydrothermal and thermal biochars (Sun et al, 2011). In contrast to N 2 -SSA, the modeling microporosity based on the benzene sorption indicates a significant decrease in micropores in the most matured kerogen (see discussion later), which is consistent with the structural alteration.…”

“…As discussed above, chemical functionality, microporosity, and structure of the kerogen control the sorption behaviors of phenanthrene and benzene. These factors are also important for the sorption of HOCs on biochars (Chun et al, 2004;Sun et al, 2011). A dominance of microspore-filling was observed for benzene sorption on a series of crop-derived chars, which had Fig.…”

“…Besides, the acidity and basicity associated with oxygen-containing components also influenced the adsorption of benzene on the chars. Sun et al (2011) found that aromatic C contents of thermally treated chars influenced nonlinearity but not necessarily the sorption capacity. The sorption capacity of the chars may be partly ascribed to aliphatic constituents.…”

Biochar: Pyrogenic Carbon for Agricultural Use - A Critical Review

“…Sorption of pesticides and other organic compounds: the Freundlich sorption coefficient (K f ) for biochar can be several orders of magnitude higher than for humic substances (Kleineidam et al, 1999) and nonlinear isotherms (Freundlich expoent, n >1); and both Freundlich parameters are directly proportional to carbonization intensity (Chen et al, 2008), the sorption ability is related to the surface area, aromaticity and porosity (Beesley et al, 2011;Kookana et al, 2011); f. The water-holding capacity depends mainly on: porosity and surface area, however the pores can be blocked by recondensation of volatile matter at low-temperature biochar (Atkinson et al, 2010;Beesley et al, 2011); and biochar hydrophilicity (Rizhiya et al, 2015), which depends on the pyrolysis temperature (Mohan et al, 2014) and technique, for example: hydrothermal are more hydrophilic than thermal biochars (Sun et al, 2011); g. Biota interactions depend mainly on: presence of hazardous and beneficial compounds (Sun et al, 2015); pH; sorption properties; porosity; and surface area (Atkinson et al, 2010;Beesley et al, 2011;Lehmann et al, 2011).…”

Chemical, structural and energy properties of hydrochars from microwave-assisted hydrothermal carbonization of glucose

“…The peaks between 14 and 60 ppm are due to the presence of aliphatic carbons [8,35], while those between 100 and 160 ppm usually referred to as the aromatic region are all due to C=C bond, but between 140 and 160 ppm are specifically due to the oxygen bound O-C=C (O-aryl) [35]. The peaks between 170 and 200 ppm are due to the presence of carboxylic acid, aldehydes or ketones moieties [36]. The spectrum also shows carbohydrate resonances (specifically CH 2 OH groups around 62 ppm, CHOH groups around 72 ppm, and anomeric O-C-O carbons around 90 ppm) in the O-alkyl region between 60 and 100 ppm [37,38].…”