Novel and Environmentally Friendly Oil Spill Dispersant Based on the Synergy of Biopolymer Xanthan Gum and Silica Nanoparticles

Pi, Guilu; Li, Yiming; Bao, Mutai; Mao, Lili; Gong, Haiyue; Wang, Zhining

doi:10.1021/acssuschemeng.6b00063

Cited by 54 publications

(39 citation statements)

References 56 publications

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“…However,t he remarkable increase in the viscosity of the emulsion at pH 3s uggests a much stronger interaction (e.g.,f avorable hydrophobic interactions and p-p stacking) [45] between N-SEKL and xylene.A lso, a Pickering emulsion (formed from particles) generally has a high viscosity owing to the adsorption of solid particles at the oil interface, which restrains the motion of oil droplets. [46] Based on Stokes' equation, [47] it is well-known that creaming is accelerated by high droplet size and low viscosity of the continuousp hase. [48] The enhanced viscosity at pH 3s lowed the dropletm igration rate (Video V3) and the number of collisions between oil droplets (Figure 3).…”

Section: Rheological Characteristicsmentioning

confidence: 99%

Pickering/Non‐Pickering Emulsions of Nanostructured Sulfonated Lignin Derivatives

Ghavidel

Fatehi

2020

ChemSusChem

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Sulfoethylated lignin (SEKL) polymeric surfactant and sulfoethylated lignin nanoparticles (N‐SEKL) with a size of 750±50 nm are produced by using a facile green process involving a solvent‐free reaction and acidification‐based fractionation. SEKL forms a liquid‐like conventional emulsion with low viscosity that has temporary stability (5 h) at pH 7. However, N‐SEKL forms a gel‐like, motionless, and ultra‐stable Pickering emulsion through a network of interactions between N‐SEKL particles, which creates steric hindrance among the oil droplets at pH 3. The deposition of SEKL and N‐SEKL on the oil surface is monitored by a using a quartz crystal microbalance. Experimentally, the formation of emulsions at pH 7 is found to be reversible owing to the low adsorption energy ΔE of SEKL on the oil droplet (ΔE≈15 kBT), which is determined with the help of three‐phase contact‐angle measurements. However, the high desorption energy (ΔE≈6.0×105 kBT) of N‐SEKL makes it irreversibly adsorb on the oil droplets. SEKL is too hydrophilic to attach to the oil interface (ΔE≈0) and thus does not facilitate emulsion formation at pH 11. Therefore, it is feasible to apply SEKL for the formulation of Pickering or non‐Pickering emulsions in the form of nanoparticles or polymeric surfactants, depending on the targeted application.

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Section: Rheological Characteristicsmentioning

confidence: 99%

Pickering/Non‐Pickering Emulsions of Nanostructured Sulfonated Lignin Derivatives

Ghavidel

Fatehi

2020

ChemSusChem

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“…Xanthan macromolecules may exhibit two different conformational structures: an ordered and a disordered (helical) conformation [ 9 , 10 , 11 ]. The XG undergoes conformational changes in aqueous solutions when exposed to temperature, salinity, and deformation stress [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Silica Nanoparticles in Xanthan Gum Solutions: Evolution of Viscosity over Time

et al. 2022

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The effect of silica nanoparticles (NP-SiO2) in xanthan gum (XG) solutions was investigated through the analysis of viscosity profiles. First, hydrocolloid XG solutions and hydrophilic NP-SiO2 suspensions were characterized individually through rheological measurements, with and without salt (NaCl). Then, nanofluids composed of XG and NP-SiO2 dispersed in water and brine were studied through two different aging tests. The addition of nanoparticles was shown to produce a slight effect on the viscosity of the fresh fluids (initial time), while a more remarkable effect was observed over time. In particular, it appears that the presence of NP-SiO2 stabilizes the polymer solution by maintaining its viscosity level in time, due to a delay in the movement of the molecule. Finally, characterization techniques such as confocal microscopy, capillary rheometry, and Zeta potential were implemented to analyze the XG/NP-SiO2 interaction. Intrinsic viscosity and relative viscosity were calculated to understand the molecular interactions. The presence of NP-SiO2 increases the hydrodynamic radius of the polymer, indicating attractive forces between these two components. Furthermore, dispersion of the nanoparticles in the polymeric solutions leads to aggregates of an average size smaller than 300 nm with a good colloidal stability due to the electrostatic attraction between XG and NP-SIO2. This study proves the existence of interactions between XG and NP-SiO2 in solution.

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“…However, these conventional separation systems are expensive, have low separation efficiencies, and need a large amount of space and additional energy to be driven . Therefore, researchers have turned their attention to the development of novel technologies for the fabrication of highly durable materials for oil/water separation . The exploration of new strategies, based on special wettability, seems to be easy and efficient.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of an Oil Spill Collector Package by Using Polyurethane Foam Wrapped with Superhydrophobic ZnO Microrods/Carbon Cloth

Khosravi

Azizian

2018

ChemPlusChem

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A new package, including polyurethane foam wrapped with superhydrophobic ZnO microrods/carbon cloth with long‐life elasticity, was fabricated and was utilized for oil spill clean‐up. First, the carbon cloth (CC) was coated with ZnO microrods, which were modified with stearic acid (SA) to obtain superhydrophobic and superoleophilic properties. The coating process was conducted in mild conditions, involving the hydrothermal growth of ZnO microrods on the surface of the carbon cloth. The obtained hydrophobic sample was modified to a superhydrophobic one by adsorption of stearic acid (SA) on its surface. The prepared sample (CC/ZnO/SA) was characterized by scanning electron microscopy (SEM), X‐ray diffraction (XRD), Fourier transform infrared spectra (FTIR), attenuated total reflectance Fourier‐transform infrared spectroscopy (ATR‐FTIR), and contact angle measurements. The prepared sample shows a water contact angle (WCA) of 160°. A piece of polyurethane foam was wrapped with the prepared superhydrophobic CC/ZnO/SA making an oil collecting package, which can float on the water surface and absorb various oils from the water surface in both static and turbulent conditions very quickly. The prepared package exhibits excellent mechanical robustness and can be used several times for oil/water separation without capacity decrease. The kinetics of oil spill absorption by the prepared package were studied, too.

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Novel and Environmentally Friendly Oil Spill Dispersant Based on the Synergy of Biopolymer Xanthan Gum and Silica Nanoparticles

Cited by 54 publications

References 56 publications

Pickering/Non‐Pickering Emulsions of Nanostructured Sulfonated Lignin Derivatives

Pickering/Non‐Pickering Emulsions of Nanostructured Sulfonated Lignin Derivatives

Effect of Silica Nanoparticles in Xanthan Gum Solutions: Evolution of Viscosity over Time

Fabrication of an Oil Spill Collector Package by Using Polyurethane Foam Wrapped with Superhydrophobic ZnO Microrods/Carbon Cloth

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