Evaluation of an elevated non-ionic surfactant critical micelle concentration in a soil/aqueous system

Zheng, Zhichao; Obbard, Jeffrey Philip

doi:10.1016/s0043-1354(01)00472-9

Cited by 110 publications

(71 citation statements)

References 10 publications

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“…This concentration can be normalized to shale mass to yield g-TX100 to Kg-shale, i.e., 7.8g-TX100/Kg-shale. Similar values have been reported in literature for natural soil (Zhou and Zhu, 2007a;Zheng and Obbard, 2002). Figure 2 that SDS-TX100 mixtures at all SDS molar fractions do improve behaviour of the nonionic surfactant.…”

Section: Adsorption To Shalesupporting

confidence: 90%

Modern Applied Science, Vol. 3, No. 2, February 2009, all in one file

MAS¹

2009

MAS

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Experiment was carried out in two parts to investigate the degradation profile of trimethoprim and sulphamethoxazole, antibacterial compounds in aqueous phase. In the first part of study, the effects of UV and TiO 2 on two antibiotics using the UV-water flow system (UVWFS) were examined. Obtained results revealed that trimethoprim and sulphamethoxazole pronounced 44 to 45% and 6 to 314% elevated rate of degradation in two TiO 2 doses, 0.05 and 0.1 g/l treatments with UV than only UV treatments which affords to draw a substantial conclusion that though both UV and TiO 2 have a crucial impact but the synergistic photocatalytic effects of the TiO 2 with UV attributes a rapid and higher degree of degradation of antibiotics compared to that of only UV at the same water flow rate. In this context, it may also be observed that effect of the dose of TiO 2 was very little in trimethoprim degradation but a significantly greater effects was revealed in sulphamethoxazole that indicating same number of TiO 2 molecules acted more favourably on higher number of sulphamethoxazole molecules than trimethoprim by photocatalytic activity which enhancing the rate of degradation reaction resulting in the rapid decrease of sulphamethoxazole concentration level in water. In second part of the study, three (15, 42 and 80 cc/min) water flow rates were employed using UVWFS maintaining same UV and TiO 2 dose 0.1 g/l to ascertain the effect of water flow rate in the antibiotic transformation process. The degradation efficiency in 80 cc/min water flow treatment was 113 and 61% higher in trimethoprim and 103 and 51% higher in sulphamethoxazole compared to that of 15 and 42 cc/min water flow treatments, respectively which clearly indicated that the rate of water flow is a paramount important, largely influencing the photocatalysis reaction process of TiO 2 and UV with antibiotics in water medium possibly enhancing movement velocity of their molecules. Besides it, trimethoprim degraded rapidly over sulphamethoxazole which might be inferred that higher water flow substantially increases the rate of oxidation and photocatalytic transformation of trimethoprim over sulphamethoxazole in the presence of TiO 2 and UV.

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Section: Adsorption To Shalesupporting

confidence: 90%

Modern Applied Science, Vol. 3, No. 2, February 2009, all in one file

MAS¹

2009

MAS

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“…CMC varies for each surfactant and is a function of temperature, ionic bonds and the presence of organic and/or mineral additives (Haigh 1996), nature of the functional groups at the interface, molecular structure, aqueous phase environment (pH, temperature, additives, electrolyte) (Rosen 1989). In a soil/solution system, the solubilization of organic compounds occurs at effective surfactant concentrations (CMC eff ) higher than CMC in pure water (Zheng and Obbard 2002).…”

Section: Introductionmentioning

confidence: 99%

Amphoteric Surfactants for PAH and Lead Polluted-Soil Treatment Using Flotation

Mouton

Mercier

Blais

2008

Water Air Soil Pollut

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Polluted soils are a problem of major concern impacting the health of the global environment and human beings. Without any safe technology for polluted soil treatment, most of the contaminated soils go to landfill especially when metals are the pollutants. This research compares the performance of non ionic (Brij 35 and Tween 80) and amphoteric (cocamydopropyl hydroxysultaine (CAS) and coamydopropylbetaine (BW)) surfactants for polycyclic aromatic hydrocarbons (PAHs) and metals (mainly Pb) removal from three contaminated soils. Best removal yields have been obtained using 0.5% (w/w) of CAS surfactant with 46± 2% for PAHs and 21±5% for Pb simultaneously removed. Sodium chloride and EDTA have been shown to considerably enhance Pb solubilization (respectively 55±5% and 35±12% for [NaCl]=5.5 M and [EDTA]=0.025 M). Flotation technology has been tested as a separating technique of PAHs micelles and Pb from aqueous solution and has given good results for both contaminants (54±7% for both PAH and Pb, using [CAS]=0.5%, [NaCl]=5.5 M, pH=3). Finally, this study proposes a soil washing process using flotation to treat soil polluted with both organic and inorganic compounds. The suggested process concentrates the organic compounds in the froth and the inorganic pollutants in the liquid fraction.

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“…The presence of micelles in the soil washing solutions is required to ensure the solubilization of hydrophobic pollutants, but it is known that the surfactant critical micellar concentration (CMC) increases in the presence of soil particles due to the surfactant adsorption (Zheng and Obbard 2002).…”

Section: Soil Washing Experimentsmentioning

confidence: 99%

“…Moreover, they exhibit low critical micelle concentrations and do not originate precipitates in the presence of ionic components of soil (Zheng and Obbard 2002). Hydrophilic non-ionic surfactants are, in particular, suitable candidates since they generally show lower adsorption on the solid soil particles, thus reducing the surfactant consumption during the washing.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of chlorophenols in soil washing wastes containing Brij 35. Correlation between the degradation kinetics and the pollutants–micelle binding

Davezza

Fabbri

Pramauro

et al. 2012

Environ Sci Pollut Res

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The photocatalytic degradations of 4-chlorophenol (CP), 4-chloro-2-methylphenol (CMP), 4-chloro-3,5-dimethylphenol (CDMP) and 4-chloro-2-isopropyl-5-methylphenol (CIMP) were investigated in water and in simulated soil washing wastes containing Brij 35 (polyoxyethylene(23)dodecyl ether) in the presence of TiO 2 dispersions. A neat inhibition of substrates decomposition proportional to their growing hydrophobicity was observed in the washing wastes for CP, CMP and CDMP whereas CIMP showed a different behaviour. The mineralization of the organic chlorine of CP and CIMP was relatively fast and complete, whereas it was much slower for CMP and CDMP. Micellar solubilization and substrate adsorption onto the semiconductor play opposite roles on the degradation kinetics and a break-point between the corresponding induced effects was evidenced when the pollutants become completely bound to the micellar aggregates.

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Evaluation of an elevated non-ionic surfactant critical micelle concentration in a soil/aqueous system

Cited by 110 publications

References 10 publications

Modern Applied Science, Vol. 3, No. 2, February 2009, all in one file

Modern Applied Science, Vol. 3, No. 2, February 2009, all in one file

Amphoteric Surfactants for PAH and Lead Polluted-Soil Treatment Using Flotation

Photocatalytic degradation of chlorophenols in soil washing wastes containing Brij 35. Correlation between the degradation kinetics and the pollutants–micelle binding

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