Solubilization and adsorption behaviors of 2,4,6-trichlorophenol in the presence of surfactants

Abstract

h i g h l i g h t sThe solubility of 2,4,6-trichlorophenol was enhanced 72 times by sodium deoxycholateat pH 7.5. NaDC demonstrated the best solubilization potential, followed by NaC, SDS and b-CD. The adsorption of 2,4,6-trichlorophenol was almost zero when NaC concentration was above CMC 2 . a r t i c l e i n f o t r a c tThe solubilization of 2,4,6-trichlorophenol (2,4,6-TCP) was studied in the presence of four different surfactants, namely sodium deoxycholate (NaDC), sodium cholate (NaC), sodium lauryl sulfate (SDS) and bcyclodextrin (b-CD). The solubility of 2,4,6-TCP was enhanced a maximum of 72 times especially by NaDC at pH 7.5. In addition, other than great solubilization capacities, NaDC and NaC have the advantages of high biodegradability and biocompatibility as biosurfactants. The adsorption behaviors of 2,4,6-TCP on the surface of soil in the presence of these solubilizers were examined. The results showed that the adsorption isotherms for all studied surfactants matched the Henry adsorption isotherm well. The adsorption mechanisms were explored and the adsorption behaviors of 2,4,6-TCP were affected by different micelle forms of the surfactants based on their critical micelle concentration (CMC). The adsorption process was demonstrated by a redistribution procedure between surfactants in solution and surfactants adsorbed onto the soil surface. In particular, the adsorption of 2,4,6-TCP was almost zero when NaC concentration was above CMC 2 .The results of our study have important implications for soil remediation and non-point source pollution control.

Adsolubilization of 2,4,6-trichlorophenol from aqueous solution by surfactant intercalated ZnAl layered double hydroxides

“…It is well known that 2,4,6-TCP is a kind of ionizable hydrophobic organic compound. The dissociation constant (pK a ) of 2,4,6-TCP is 6.23 [20]. When the pH was lower than 6.23, 2,4,6-TCP is ionized difficultly and could be presented as the molecular form containing -OH group.…”

“…After adsorbing, the suspension was filtered with 0.22 lm organic membrane filter. The residual 2,4,6-TCP concentration was detected by UV-vis absorption spectra at 290 nm for acidic condition and at 314 nm for alkaline condition, respectively [20,39]. The amount of 2,4,6-TCP adsolubilised per unit mass of adsorbents (Q t , mg/g) at a certain time was calculated by the following equation:…”

“…However, these methods and materials usually involve high cost, complex process, and even may lead to secondary pollution during degradation process. Therefore, some researchers have paid their attention to adsorption methods (especially adsolubilization) to solve the issue of water contamination by phenol and its derivatives including 2,4,6-TCP [16][17][18][19][20].…”

Synthesis of Molecularly Imprinted Polymers for the Selective Extraction /Removal of 2,4,6-trichlorophenol

“…Among CPs, 2,4, 4, is considered as one of the toxic pollutants because of its harmful effects [3 -5]. The U.S. Environmental Protection Agency has also classified it as a priority pollutant [6].Chlorophenols are poisonous and possibly cancer-causing and can influence the smell and taste of drinking water even in very low concentrations (µgL -1 ) , therefore, it is included by both the US Environmental Protection Agency (EPA), 1977 and the European Union (EU) in their lists of priority pollutants. EU Directive 2455/2001/EC sets the most extreme 0.5 µgL -1 concentration in drinking water and individual CPs concentration must not surpass 0.1 µgL -1 .…”

Surfactant‐assisted separation of ginkgo flavonoids from Ginkgo biloba leaves using leaching and foam fractionation

“…GF are one group of non‐surface‐active materials and possess a low solubility in the aqueous solution. In order to achieve foam fractionation operation, a suitable surfactant should be selected for simultaneously playing the dual roles of solubilizer and collector. First, GF are massively dissolved in the leaching solution based on the solubilization effect of the selected surfactant.…”