Polydimethylsiloxane-coated macroporous silica adsorbent in thermal desorption gas chromatography

Ueta, Ikuo; Hayashibe, Mizuki; Sumiya, Katsunori; Ariizumi, Yuki; Fujimura, Kazuma; Saito, Yoshihiro

doi:10.1016/j.jcoa.2023.100084

Cited by 3 publications

(1 citation statement)

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“…Functionalized silica carriers, on the other hand, are materials that have been chemically modified to obtain specific properties, such as chemical reactivity or adsorption capacity aimed at specific substances [ 21 ]. Silica carriers are commonly used as adsorption materials to remove a variety of contaminants from a variety of environments, including surface water, groundwater, and gases [ 22 , 23 , 24 ]. They are minerals composed mainly of silica (silicon dioxide, SiO 2 ) and can have different forms, such as colloidal silica, activated silica, or functionalized silica [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Application of Mesoporous Silicas for Adsorption of Organic and Inorganic Pollutants from Rainwater

Marszałek,

Puszczało,

Szymańska

et al. 2024

Materials

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Precipitation is an important factor that influences the quality of surface water in many regions of the world. The pollution of stormwater runoff from roads and parking lots is an understudied area in water quality research. Therefore, a comprehensive analysis of the physicochemical properties of rainwater flowing from parking lots was carried out, considering heavy metals and organic micropollutants. High concentrations of zinc were observed in rainwater, in addition to alkanes, e.g., tetradecane, hexadecane, octadecane, 2,6,10-trimethyldodecane, 2-methyldodecane; phenolic derivatives, such as 2,6-dimethoxyphenol and 2,4-di-tertbutylphenol; and compounds such as benzothiazole. To remove the contaminants present in rainwater, adsorption using silica carriers of the MCF (Mesostructured Cellular Foams) type was performed. Three groups of modified carriers were prepared, i.e., (1) SH (thiol), (2) NH2 (amino), and (3) NH2/SH (amine and thiol functional groups). The research problem, which is addressed in the presented article, is concerned with the silica carrier influence of the functional group on the adsorption efficiency of micropollutants. The study included an evaluation of the effects of adsorption dose and time on the efficiency of the contaminant removal process, as well as an analysis of adsorption isotherms and reaction kinetics. The colour adsorption from rainwater was 94–95% for MCF-NH2 and MCF-NH2/SH. Zinc adsorbance was at a level of 90% for MCF-NH2, and for MCF-NH2/SH, 52%. Studies have shown the high efficacy (100%) of MCF-NH2 in removing organic micropollutants, especially phenolic compounds and benzothiazole. On the other hand, octadecane was the least susceptible to adsorption in each case. It was found that the highest efficiency of removal of organic micropollutants and zinc ions was obtained through the use of functionalized silica NH2.

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