Effect of lead on the sorption of 2,4,6-trichlorophenol on soil and peat

Abstract

Lead diminished the sorption of 2,4,6-trichlorophenol onto soil and peat. AbstractThe effect of lead on the sorption of 2,4,6-trichlorophenol (2,4,6-TCP) on soil and peat was investigated using a batch equilibration method. Lead markedly diminished the sorption of 2,4,6-TCP, and 2,4,6-TCP had little effect on lead sorption. Peat was a more effective adsorbent for 2,4,6-TCP than soil. The desorption hysteresis of 2,4,6-TCP verified the presence of high-energy sorption sites. Mechanisms of lead suppression effect on the 2,4,6-TCP sorption included the following: Firstly, lead accelerated the aggregation of colloids, the aggregates covered the surface in part and shrunk the pore sizes of the adsorbents, hence decreased the sorption of 2,4,6-TCP. Secondly, X-ray absorption and Fourier transform infrared spectroscopy study suggested that lead competed with 2,4,6-TCP for carboxylic, phenolic and Si-OH groups of organic matter and clay minerals. Such competition was partly responsible for the overall suppression effect of lead on the sorption of 2,4,6-TCP.

Adsorption characteristics of 1,2,4-trichlorobenzene, 2,4,6-trichlorophenol, 2-naphthol and naphthalene on graphene and graphene oxide

“…2a and b, their adsorption on G and GO were almost independent of solution pH over the investigated pH range because both TCB and NAPH were nonionizable [3]. The adsorption of TCP decreased slightly over pH 2.0-6.0, and decreased rapidly at pH > 6.0, consistent to the adsorption of TCP on soil and peat [22]. Considering pKa value of TCP (6.15), it appears that the greater adsorption at low pH may be due to higher content of neutral TCP.…”

Sorption of Anionic Metsulfuron-Methyl and Cationic Difenzoquat on Peat and Soil As Affected by Copper

“…Peat and soil were the same adsorbents used previously (16). A black chernozem soil (a clay loam Mollisol) was collected from the surface horizon (0-20 cm) in Heilongjiang Province, northeastern China.…”

Adsorption of 2,4,6-trichlorophenol by multi-walled carbon nanotubes as affected by Cu(II)

“…However, contaminants often exist in mixtures in the environment, where they may affect each other's sorption. Heavy metals and organic contaminants coexist at many contaminated sites (Dai et al, 2007;Sprovieri et al, 2007), and coexisting heavy metal ions affect the adsorption of organic contaminants to soil, peat and charcoal (Pei et al, 2006(Pei et al, , 2007Chen et al, 2007). A few studies have been reported on competitive sorption between metals (Li et al, 2003b) or between organic contaminants on CNTs (Yang et al, 2006b).…”