Separation of polycyclic aromatic hydrocarbons from rhamnolipid solution by activated carbon adsorption

Liu, Jianfei; Zhang, Yongsheng; Xiao-guang, Sun; Wen-liang, HU

doi:10.1007/s12665-016-6264-3

Cited by 13 publications

(6 citation statements)

References 44 publications

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“…TW-80 adsorbed onto MWCNTs increased with the increasing concentration. Surfactant adsorption from the solution to the MWCNTs’ surface depended on their concentration [ 41 ]. The TW-80 mainly existed as monomers when its concentration was below 13–15 mg/L, whereas TW-80 formed micelles when its concentration was above 15 mg/L, because the added surfactant molecules were easily aggregated [ 42 ].…”

Section: Resultsmentioning

confidence: 99%

“…The Phe adsorption capacities were decreased more when surfactants were present in higher concentrations ( Figure 3 ). When the surfactant concentrations were higher, more surfactant micelles would remain in the aqueous state, enhancing the solubility or desorption of more PAHs and furthermore decreasing PAH adsorption [ 41 ]. The saturated adsorption capacity of Phe on MWCNTs affected by surfactants was MWCNTs > TX-100-100 + MWCNTs > TX-100-200 + MWCNTs > TW-80-50 + MWCNTs > TW-80-100 + MWCNTs ( Table 2 ).…”

Section: Resultsmentioning

confidence: 99%

“…The sizes of nonionic surfactant micelles and Phe molecules in water were in the order of TX-100 (20 nm) > TW-80 (10 nm) > Phe (0.6 nm) [ 26 , 53 , 54 ], respectively. Surfactant molecules/micelles of different sizes were adsorbed on the surfaces of MWCNTs, reducing the surface area of MWCNTs and blocking the micropores of MWCNTs [ 41 , 55 ]. The SA and pore volume of MWCNTs after adsorbing large-sized TX-100 molecules/micelles were significantly smaller than those after adsorbing small-sized TW-80 molecules/micelles ( Table 4 ).…”

Section: Resultsmentioning

confidence: 99%

“…In the second step, the Phe and nonionic surfactant monomers were absorbed on the MWCNT interface. The different concentrations of nonionic surfactants are adsorbed on the surfaces of MWCNTs in different forms of hemi-micelles or multilayer [ 41 ], and compete with Phe for adsorption sites on the surfaces of MWCNTs, preventing Phe from entering micropores. In the third step, at concentrations greater than the CMC, micelles dissociate due to adsorption to restore equilibrium, and Phe is released from micelles and enters the adsorbed surfactant micelles.…”

Section: Resultsmentioning

confidence: 99%

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Adsorption of Phenanthrene on Multi-Walled Carbon Nanotubes in the Presence of Nonionic Surfactants

Cao

Zhou

Wang

et al. 2023

IJERPH

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The bioavailability and mobility of phenanthrene (Phe) adsorbed by multi-walled carbon nanotubes (MWCNTs) may be substantially influenced by nonionic surfactants used both in the synthesis and dispersion of MWCNTs. The adsorption mechanisms of Phe adsorbed onto MWCNTs under the different nonionic surfactants Tween 80 (TW-80) and Triton X-100 (TX-100) in the aqueous phase were investigated in terms of changes in the MWCNTs’ compositions and structures. The results showed that TW-80 and TX-100 were easily adsorbed onto MWCNTs. Phe adsorption data onto MWCNTs were better suited to the Langmuir equation than the Freundlich equation. Both TW-80 and TX-100 reduced the adsorption capacity of Phe onto MWCNTs. When TW-80 and TX-100 were added in the adsorption system, the saturated adsorption mass of Phe decreased from 35.97 mg/g to 27.10 and 29.79 mg/g, respectively, which can be attributed to the following three reasons. Firstly, the hydrophobic interactions between MWCNTs and Phe became weakened in the presence of nonionic surfactants. Secondly, the nonionic surfactants covered the adsorption sites of MWCNTs, which caused Phe adsorption to be reduced. Finally, nonionic surfactants can also promote the desorption of Phe from MWCNTs.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Adsorption of Phenanthrene on Multi-Walled Carbon Nanotubes in the Presence of Nonionic Surfactants

Cao

Zhou

Wang

et al. 2023

IJERPH

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“…Filtered samples were then analyzed with high-performance liquid chromatography (HPLC, Dionex U3000, Sunnyvale, CA, USA). The specific experimental conditions have been described in our earlier study [ 26 ]. All the experiments performed in triplicate and the average value is taken as the calculated value.…”

Section: Methodsmentioning

confidence: 99%

Synergistic Solubilization of Phenanthrene by Mixed Micelles Composed of Biosurfactants and a Conventional Non-Ionic Surfactant

Liu

Wang

2020

Molecules

Self Cite

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This study investigated the solubilization capabilities of rhamnolipids biosurfactant and synthetic surfactant mixtures for the application of a mixed surfactant in surfactant-enhanced remediation. The mass ratios between Triton X-100 and rhamnolipids were set at 1:0, 9:1, 3:1, 1:1, 1:3, and 0:1. The ideal critical micelle concentration values of the Triton X-100/rhamnolipids mixture system were higher than that of the theoretical predicted value suggesting the existence of interactions between the two surfactants. Solubilization capabilities were quantified in term of weight solubilization ratio and micellar-water partition coefficient. The highest value of the weight solubilization ratio was detected in the treatment where only Triton X-100 was used. This ratio decreased with the increase in the mass of rhamnolipids in the mixed surfactant systems. The parameters of the interaction between surfactants and the micellar mole fraction in the mixed system have been determined. The factors that influence phenanthrene solubilization, such as pH, ionic strength, and acetic acid concentration have been discussed in the paper. The aqueous solubility of phenanthrene increased linearly with the total surfactant concentration in all treatments. The mixed rhamnolipids and synthetic surfactants showed synergistic behavior and enhanced the solubilization capabilities of the mixture, which would extend the rhamnolipids application.

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Solubilization of Polycyclic Aromatic Hydrocarbon Mixtures in Conventional and Gemini Surfactant Solutions

Liu

Zhao

Zhang

2022

Sustainable Development of Water and Environment

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Separation of polycyclic aromatic hydrocarbons from rhamnolipid solution by activated carbon adsorption

Cited by 13 publications

References 44 publications

Adsorption of Phenanthrene on Multi-Walled Carbon Nanotubes in the Presence of Nonionic Surfactants

Adsorption of Phenanthrene on Multi-Walled Carbon Nanotubes in the Presence of Nonionic Surfactants

Synergistic Solubilization of Phenanthrene by Mixed Micelles Composed of Biosurfactants and a Conventional Non-Ionic Surfactant

Solubilization of Polycyclic Aromatic Hydrocarbon Mixtures in Conventional and Gemini Surfactant Solutions

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