Effects of humic acid and lipid on the sorption of phenanthrene on char

Role of structure, accessibility and microporosity on sorption of phenanthrene and nonylphenol by sediments and their fractions

“…The V o and SSA values of the isolated fractions are in an order DM < LF < NHC, indicating that the micropore volume and surface area increase as the removal of lipids, carbohydrates and proteins. Previous studies found black carbon coated with lipid reduced microporosity and surface area (Kwon and Pignatello, 2005;Wen et al, 2009). Pore volumes smaller than 0.7 nm account for 75.4e77.5% of cumulative pore volumes ranging from 0 to 1.1 nm for DM fractions, and these percentages change to 76.8e84.0% for the LF fractions, then change to 67.7e73.9% for the NHC fractions.…”

“…The sorption affinity for phenanthrene is higher for the lipid-extracted soils than for the whole soils, indicating that lipids compete for or block sorption sites on the organic matter (Ahangar et al, 2009). Other study indicated that char coated with LP led to the decrease in the organic-normalized sorption coefficients (K FOC ) and the increase in the n values for Phen sorption (Wen et al, 2009). Interestingly, the single K OC of the LF fractions for NP increases mainly at lower aqueous concentrations after the removal of LP, while it decreases at higher concentrations.…”

“…The composition, structure and physical conformation of SOM may strongly influence HOCs sorption in SOM (Ran et al, 2007;Wen et al, 2009;Mitchell and Simpson, 2012;Jin et al, 2015). With respect to the role of SOM structure on sorption of HOCs, it is still debatable on the relative importance of aromatic and aliphatic carbon structure.…”

“…For example, current literature suggested the joint importance of aromatic and aliphatic carbon of SOM in HOCs sorption (Jin et al, 2015), while other recent study demonstrated that the potential role of aromatic carbon (or aliphatic carbon) in HOCs sorption is dependent on the sources of sorbents (Han et al, 2014). Other studies revealed the importance of physical conformation and accessibility in SOM and their role in the HOC sorption (Ahangar et al, 2009;Wen et al, 2009;Mitchell and Simpson, 2012). Minerals associated with SOM could change the conformation of SOM (Feng et al, 2006).…”

“…Lignin coated on cellulose and chitin had increased sorption affinity and isotherm nonlinearity of HOCs, due to the newly formed condensed domains . Coated char with humic acid and lipid had decreased sorption affinity and isotherm nonlinearity of HOCs (Wen et al, 2009). Moreover, micropore filling was reported to dominate sorption of HOCs by different organic matter Sun et al, 2013;Han et al, 2014).…”