Enhanced Solubilization and Desorption of Organochlorine Pesticides (OCPs) from Soil by Oil-Swollen Micelles Formed with a Nonionic Surfactant

Zheng, Guanyu; Selvam, Ammaiyappan; Wong, Jonathan W C

doi:10.1021/es302832z

Cited by 45 publications

(29 citation statements)

References 41 publications

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“…A less rapid fraction was observed for the 150 and 400 mg L ¡1 amendments as compared to the 700 mg L ¡1 amendment. The values of k slow were two to three orders of magnitude lower than the k rap values for all PAHs in different samples, which is consistent with other studies that apply the two-compartment desorption model [42,48,54]. These results could be considered to well validate the biphasic behaviour of organic compounds desorption and to confirm the supposition of the model.…”

Section: Desorption Ratessupporting

confidence: 89%

Desorption kinetics of polycyclic aromatic hydrocarbons (PAHs) from contaminated soil and the effect of biosurfactant supplementation on the rapidly desorbing fractions

Bezza

Chirwa

2015

Biotechnology & Biotechnological Equipment

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There are often two phases in the desorption of polycyclic aromatic hydrocarbons (PAHs): an initial phase of rapid desorption and a subsequent phase of much slower release. By assessing the rapidly desorbing fraction of PAHs, a direct measure of the microbially degradable component of PAH contamination can be obtained and achievable bioremediation performances can be predicted. In this study, microbial biosurfactant produced by a Pseudomonas aeruginosa strain, identified as a lipopeptide by attenuated total reflectance Fourier transform infrared spectroscopy, was investigated for its efficacy in enhancing PAH desorption and mobilization in a spiked soil system. The desorption of pyrene and phenanthrene from the artificially spiked soil was enhanced 3.5À4.0 times at 700 mg L ¡1 lipopeptide amendment than at 150 mg L ¡1 amendment or in the unamended soil. The amount desorbed was generally in direct proportion to the amount of lipopeptide present. Mathematical modelling using a first-order two-compartment model was applied to simulate the process of desorption from the soil in the presence of different concentrations of lipopeptide and to predict the effect of the biosurfactant on the rapidly desorbing fraction. With the increase of supplementation of lipopeptide from 150 to 700 mg L ¡1, the rapidly desorbing fraction, which is generally considered to be the bioavailable fraction, increased from 18% to 73% and from 6% to 51% for phenanthrene and pyrene, respectively. This shows the potential application of the biosurfactant in increasing the bioavailable fraction and enhancing the bioremediation of PAH contaminated media.

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Section: Desorption Ratessupporting

confidence: 89%

Desorption kinetics of polycyclic aromatic hydrocarbons (PAHs) from contaminated soil and the effect of biosurfactant supplementation on the rapidly desorbing fractions

Bezza

Chirwa

2015

Biotechnology & Biotechnological Equipment

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“…Error bars represent standard deviation of triplicates previous herbicide study also reported that sorption usually increased with longer residence time in soil (Mamy and Barriuso 2007). Similarly, Zheng et al (2012) mentioned that organochlorine pesticides were sorbed strongly and long-lastingly to soils and sediments.…”

Section: Desorption Of Aged Soilsmentioning

confidence: 86%

Sorption/desorption of 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane(4,4′-DDT) on a sandy loam soil

Erdem

Cutright

2015

Environ Monit Assess

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1,1,1-Trichloro-2,2-bis(p-chlorophenyl)ethane(4,4'-DDT) is a pesticide well-known for its negative health and environmental effects. Despite being banned by a majority of world countries more than 30 years ago, its persistence in the environment is a continuing problem even today. The objective of the study was the investigation of sorption/desorption behavior of 4,4'-DDT in sandy loam soil. The impact of contaminant concentration and age was observed with three different experiments. The sorption percentages at the end of the short time step (8 h) were 50 and 92 %, for initial concentrations 2.26 and 5.28 mg/L, respectively. When freshly spiked soil was subjected to a conventional sorption study, 82 to 99.6 % of the initial aqueous DDT concentrations were sorbed within 24 h. When modeled with a Freundlich isotherm, the log K f was found to be 3.62. After six consecutive 24 h desorption steps, 33 to 96.6 % still remained in the soil. This was more pronounced for soils that had been aged for 60 days. After seven consecutive 24 h desorption steps of aged soil, the percent remaining sorbed to the soil were 44, 64, and 77 %, for 25, 250, and 500 mg/kg, respectively. All results show that 4,4-DDT has a tendency of sorbing to the soil rapidly and showing resistance to desorption. When comparing desorption values, aged soils were seen to desorb less than non-aged soils. This result was attributed to stronger binding to soil with increased contact time.

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“…A microemulsion precursor containing surfactant, alcohol, and oil was prepared by weighing and mixing 14.00 g of polyoxyethylene sorbitan monooleate (Tween 80), 4.60 g of 1-pentanol, and 1.40 g of linseed oil (Zheng et al 2011(Zheng et al , 2012a. The precursor was gently mixed with 80.00 g of deionized water or seawater to obtain microemulsion with a concentration of 20 % (w/w).…”

Section: Microemulsion Preparation and Its Stability Investigationmentioning

confidence: 99%

“…In addition, the addition of alcohol further enhances contaminants' solubilization by lowering the surface tension between the surfactant tails and the oil (Testard and Zemb 1998). It is already revealed that, in microemulsions, oil provides hydrophobic cores for solubilizing hydrophobic contaminants, while the interfacial film formed by alcohol and surfactant can stabilize the microemulsion system and meanwhile increase the degree of solubilization of hydrophobic contaminants (Zheng et al 2011(Zheng et al , 2012a. Thus, microemulsions have some special properties including ultralow interfacial tension between the oil and water phases, larger interfacial area, and higher solubilizing capacity for hydrophobic compounds over surfactant solutions (Zheng et al 2011(Zheng et al , 2012a.…”

Section: Introductionmentioning

confidence: 99%

“…It is already revealed that, in microemulsions, oil provides hydrophobic cores for solubilizing hydrophobic contaminants, while the interfacial film formed by alcohol and surfactant can stabilize the microemulsion system and meanwhile increase the degree of solubilization of hydrophobic contaminants (Zheng et al 2011(Zheng et al , 2012a. Thus, microemulsions have some special properties including ultralow interfacial tension between the oil and water phases, larger interfacial area, and higher solubilizing capacity for hydrophobic compounds over surfactant solutions (Zheng et al 2011(Zheng et al , 2012a. Previous studies have revealed that microemulsions can enhance the contact between hydrophobic substances and degradative microbes, thereby accelerating the degradation of hydrophobic substances (Zheng et al 2012b).…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of nitrate-induced bioremediation in marine sediments contaminated with petroleum hydrocarbons by using microemulsions

Zhang

Zheng

2014

Environ Sci Pollut Res

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The effect of microemulsion on the biodegradation of total petroleum hydrocarbons (TPH) in nitrate-induced bioremediation of marine sediment was investigated in this study. It was shown that the microemulsion formed with non-ionic surfactant polyoxyethylene sorbitan monooleate (Tween 80), 1-pentanol, linseed oil, and either deionized water or seawater was stable when subjected to dilution by seawater. Desorption tests revealed that microemulsion was more effective than the Tween 80 solution or the solution containing Tween 80 and 1-pentanol to desorb TPH from marine sediment. In 3 weeks of bioremediation treatment, the injection of microemulsion and NO3 (-) seems to have delayed the autotrophic denitrification between NO3 (-) and acid volatile sulfide (AVS) in sediment compared to the control with NO3 (-) injection alone. However, after 6 weeks of treatment, the delaying effect of microemulsion on the autotrophic denitrification process was no longer observed. In the meantime, the four injections of microemulsion and NO3 (-) resulted in as high as 29.73 % of TPH degradation efficiency, higher than that of two injections of microemulsion and NO3 (-) or that of four or two injections of NO3 (-) alone. These results suggest that microemulsion can be potentially applied to enhance TPH degradation in the nitrate-induced bioremediation of marine sediment.

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Enhanced Solubilization and Desorption of Organochlorine Pesticides (OCPs) from Soil by Oil-Swollen Micelles Formed with a Nonionic Surfactant

Cited by 45 publications

References 41 publications

Desorption kinetics of polycyclic aromatic hydrocarbons (PAHs) from contaminated soil and the effect of biosurfactant supplementation on the rapidly desorbing fractions

Desorption kinetics of polycyclic aromatic hydrocarbons (PAHs) from contaminated soil and the effect of biosurfactant supplementation on the rapidly desorbing fractions

Sorption/desorption of 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane(4,4′-DDT) on a sandy loam soil

Enhancement of nitrate-induced bioremediation in marine sediments contaminated with petroleum hydrocarbons by using microemulsions

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