Switchable anionic surfactants for the remediation of oil-contaminated sand by soil washing

Ceschia, E.; Harjani, Jitendra R.; Liang, Chen; Ghoshouni, Zahra; Andrea, Tamer; Brown, R. Stephen; Jessop, Philip G.

doi:10.1039/c3ra47158f

Cited by 105 publications

(95 citation statements)

References 37 publications

(32 reference statements)

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“…In fact, as recently demonstrated for the remediation of oil-contaminated sands, 13 SAS are effectively and simply recoverable by using CO 2 as pH-trigger.…”

Section: Dissolution Of Npcm With Switchable Anionic Surfactantsmentioning

confidence: 82%

“…All of them were prepared by mixing the corresponding carboxylic acid (1 eq) and the necessary base (1.5 eq of NH 4 OH or 1 eq of NaOH) in water. 13 Only sodium and ammonium laurates were completely water soluble even at concentrations of 150 mM. All other longer chain sodium or ammonium carboxylates were insoluble even at very low concentrations (5 mM).…”

Section: Dissolution Of Npcm With Switchable Anionic Surfactantsmentioning

confidence: 94%

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Dimethyl carbonate and switchable anionic surfactants: two effective tools for the extraction of polyhydroxyalkanoates from microbial biomass

et al. 2015

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The availability of green and cheap technologies to recover polyhydroxyalkanoates (PHAs) from microbial biomass is crucial for the development of a reliable and sustainable production chain. Here, two novel protocols are proposed to extract PHAs from Cupravidus necator. The first method is based on PHA-extraction with dimethyl carbonate (DMC), a green solvent that is completely biodegradable and less harmful to humans and the environment than most solvents. The procedure can be applied directly to concentrated microbial slurries or to dry biomass, affording very high polymer recovery (>85%) and excellent purity (>95%). No degradation/decomposition of the polymer is observed in both cases. The second protocol uses fatty acid carboxylates as surfactants, which disrupt cell membranes, providing excellent polymer recovery (>99%) and high purity (>90%). Ammonium laurate can be successfully used and easily recycled (98%) by lowering the pH through CO 2 addition. Therefore, both protocols reported here are effective and sustainable: the recovery and purity of the obtained PHAs are very high, the use of toxic chemicals is avoided, and the recycling of various solvents/surfactants used in the processes is optimal. Extraction of PHB with organic solventsFreeze-dried biomass extraction. C. necator freeze-dried samples (50 mg) were extracted with organic solvents (2 mL) for 1-4 h. The tested solvents and the corresponding temperatures of extraction were: DMC (90°C and 50°C), PC (90°C), DEC (90°C), ethyl acetate (80°C) and CH 2 Cl 2 (50°C). At the end of the extraction, the solutions were centrifuged at 4000 rpm for 1 min and then filtered with polypropylene membrane filters of 0.45 µm porosity. The polymer was recovered by solvent evaporation or by precipitation with EtOH, then dried at 60°C under vacuum overnight.Each extraction was performed in quadruplicate.

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“…In fact, as recently demonstrated for the remediation of oil-contaminated sands, 13 SAS are effectively and simply recoverable by using CO 2 as pH-trigger.…”

Section: Dissolution Of Npcm With Switchable Anionic Surfactantsmentioning

confidence: 82%

Section: Dissolution Of Npcm With Switchable Anionic Surfactantsmentioning

confidence: 94%

Dimethyl carbonate and switchable anionic surfactants: two effective tools for the extraction of polyhydroxyalkanoates from microbial biomass

et al. 2015

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“…Several studies on the use of cationic, anionic as well as nonionic surfactants for removing oil from oil-contaminated sediments with both the flotation separation and washing methods have been reported (Ceschia et al, 2014;Deshpande et al, 1999;Duffield et al, 2003). Surfactants reduce the hydrophobicity of the oil phase so that the oil can be easily wetted by the water phase and thus detach from the sediment surface.…”

Section: Flotation and Washingmentioning

confidence: 96%

“…These surfactants could act as both emulsion stabilizers and destabilizers in the presence and absence of CO 2 , respectively (Penth, 1995). SASs are also more efficient in oil removal than non-switchable surfactants (Ceschia et al, 2014).…”

Section: Flotation and Washingmentioning

confidence: 99%

“…In addition, prolonged sediment washing with a surfactant solution often tends to form a stable oil-in-water emulsion, making it difficult to separate from the aqueous phase. To overcome this limitation, next-generation surfactants commonly known as switchable anionic surfactants (SAS) have been studied in the remediation of oilcontaminated sediment by washing (Ceschia et al, 2014). Switchable surfactants can be switched 'on and off' with triggers such as light, pH or redox reagents (Datwani et al, 2003;Dexter et al, 2006;Liu et al, 2006;Sakai et al, 1999;Scott et al, 2012).…”

Section: Flotation and Washingmentioning

confidence: 99%

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Remediation technologies for oil-contaminated sediments

Agarwal

Liu

2015

Marine Pollution Bulletin

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Functional Colloidal Stabilization

Bijlard

Wald

Crespy

et al. 2016

Adv Materials Inter

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acids), and protective agents. The unifying concept and key property of colloidal stabilizers is to provide a significant repulsion between the individual dispersed particles, making the heterophase system kinetically stable, which is typically accomplished via electrostatic or steric stabilization.Functional colloid stabilization provides additional features in addition to simple repulsion via physisorbed molecules. In fact, it is surprising that the majority of artificial heterophase systems have overlooked the simple and efficient possibility of spatially resolved chemical modification. The utilization of surface-active functional stabilizers is a fast and flexible method to obtain colloidal particles with strongly improved interaction properties. This functionalization has proved extremely material-and time-efficient. Due to the self-assembling ability of the stabilizers, the functional groups allow for an exact positioning of chemical and physical interaction sites directly in the surface region of the colloidal particle.The purpose of this review is to highlight functional colloidal stabilization as defined above. Our main focus concentrates on reactive systems, especially heterophase polymerization in oil-in-water (o/w) and water-in-oil (w/o) emulsions; a waterin-oil emulsion is regarded as an inverse emulsion. We differentiate between various types of surfactants which can either adsorb or react to the dispersed material with one segment, while the second part of the amphiphile stabilizes the dispersion. The stability of emulsions can be obtained by either low or high mole cular weight surfactants. Additionally, we distinguish between surfactants from so-called protective colloids of higher mole cular weight without significant self-aggregation properties. Throughout this review, the literature on functional colloidal stabilizers was revised and classified according to molecular weight, preparation technique, chemical structure, and stimuli-responsive behavior. Certain aspects such as inorganic/organic hybrids, or bioconjugates with sequence-defined structures such as peptides and nucleotides, are not in the scope of the present review and will only be briefly described when relevant.The review is structured as follows: we start with a brief summary of conventional low molecular weight (Section 2.1) and polymeric surfactants (Section 2.2) which typically lack of additional function besides the colloid stabilization. Only some of these also industrially used surfactants carry, for example, olefins or hydroxyl-groups embedded in their chemical structure, but do not have additional handles to the colloids. After this Surfactants can stabilize colloids in dispersion; however, also additional chemical or physical functions can be added by the surfactant chemistry to the colloid. This review covers functional colloid stabilization whereby supplementary features in addition to simple repulsion via physisorbed mole cules are described. The utilization of surface-active functional stabilizers as a fast and flexibl...

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Switchable anionic surfactants for the remediation of oil-contaminated sand by soil washing

Cited by 105 publications

References 37 publications

Dimethyl carbonate and switchable anionic surfactants: two effective tools for the extraction of polyhydroxyalkanoates from microbial biomass

Dimethyl carbonate and switchable anionic surfactants: two effective tools for the extraction of polyhydroxyalkanoates from microbial biomass

Remediation technologies for oil-contaminated sediments

Functional Colloidal Stabilization

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