Abstract
To better understand the effects of nonionic silicones and polymers on the wetting and foaming properties of anionic and nonionic hydrocarbon surfactants and different forces between molecules, nonionic silicone surfactant (GT-248), polymer (HPMC), anionic surfactant (AES), and nonionic surfactants (APG0810) were selected. The CMC ratio is used as a reference to determine the concentration ratio of the APG0810/GT-248 and AES/GT-248 compound solutions, after which HPMC was added to form a compound solution to test the wetting and foaming properties of the compound solution. The results showed that GT-248 obtained a high density of methyl groups on the surface of the solution due to its excellent spreadability and good flexibility of the siloxane chain, effectively reduces the surface tension and wetting time of AES and APG0810 solutions. But in terms of foam performance, after adding GT-248 to solution, the foam stability of AES solution is enhanced, the foam height of AES solution was reduced by 33.7%, the foam stability of APG0810 solution is weakened a lot, and the foam height of APG0810 solution was reduced by 85.4%. Mainly because of the difference in electronegativity between the AES and APG0810 head groups, the strong electronegativity between the AES head groups resulted in a smaller number of GT-248 insertions in the liquid film, which weakened the defoaming effect of GT-248. The weak interaction between the head groups of APG0810 resulted in a higher amount of GT-248 in the liquid film, and thus, the foam performance was greatly reduced. After the AES/GT-248 compound solution was preferred, by comparing the viscosity, surface tension, and the half-life of the foam, it was found that the addition of low concentration of polymer effectively improved the half-life of the foam without affecting the foaming properties, and the final choice of 4:1(AES/GT-248) + 1mgHPMC and 2:1(AES/GT-248) + 1mgHPMC composite solutions can be used as a superior dust suppression material.
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The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This work has been funded by the National Natural Science Foundation of China (51904158), China Postdoctoral Science Foundation (2020M671469), the Introduction of Talent Research Start-up Fund of Nanjing Tech University, Postgraduate Research & Practice Innovation Program of Jiangsu Province-(SJCX21_0512).
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Dr. Wang analyzed and interpreted the data regarding the coal dust wetting and surface adsorption. Lina Tuo and Gang Zhou performed the experimental part of coal dust wetting and surface adsorption, and foaming with polymer addition. Yuanyuan Zhang and Xu Geng tested the viscosity of the solutions after polymer addition and performed structural analysis. Fasong Zhang and Yonghe Li were responsible for the general assembly of the article and the revision of the article format. All authors read and approved the final manuscript.
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Wang, Q., Tuo, L., Zhou, G. et al. Effect of silicones and polymers on the wetting and foaming properties of anionic and nonionic hydrocarbon surfactants. Environ Sci Pollut Res 29, 81713–81725 (2022). https://doi.org/10.1007/s11356-022-21517-y
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DOI: https://doi.org/10.1007/s11356-022-21517-y