Rapid preparation of methyltrimethoxy‐modified magnetic mesoporous silica as an effective solid‐phase extraction adsorbent

Abstract

A time-saving method was applied to synthesize methyltrimethoxy-modified magnetic mesoporous silica with or without p-toluenesulfonic acid as the catalyst for magnetic solid-phase extraction. The synthesized materials were systematically characterized. Results demonstrated that methyltrimethoxy modified magnetic mesoporous silica with p-toluenesulfonic acid as the catalyst has a relatively smaller aperture and extreme hydrophobicity (water contact angle of 135°). To evaluate the feasibility of these prepared materials as effective adsorbents, it was combined with gas chromatography and electron capture detection to determine 26 polychlorinated biphenyls in environmental water. The result revealed that methyltrimethoxy modified magnetic mesoporous silica with p-toluenesulfonic acid as the catalyst had the best extraction efficiency and recovery. Under the optimized extracted conditions, the proposed method showed good linearity within the concentration range of 5 to 200 ng/L with correlation coefficients of 0.9969 to 0.9999. The limits of detection and quantification based on signal-to-noise ratios of 3 and 10 were in the range of 0.16 to 0.91 and 0.52 to 3.0 ng/L, respectively. The polychlorinated biphenyl concentrations in environmental water samples were successfully determined using the developed method. PCB008 and PCB110 were 4.05 and 8.52 ng/L in Red-Star lake water (Hubei Province, China), respectively.

Surface modification of coconut shell activated carbon for efficient solid‐phase extraction of N‐nitrosodimethylamine from water

“…From the improved adsorption/recoveries of NDMA obtained through AC800, it is evident that hydrophobic interactions were dominant than hydrogen bonds. It was reported that hydrophobic interaction is an effective mechanism for the extraction of organic compounds [50]. The significant improvement in the recoveries achieved by AC800 indicated that heat treatment significantly favored the extraction of NDMA.…”

Adsorptive remediation of environmental pollutants using magnetic hybrid materials as platform adsorbents

“…Magnetic nanoparticles were coated with the layer of mesoporous silica modified with methyl dimethoxy, and p-toluenesulfonic acid (PTSA) was used as a catalyst and finally, a will defined Fe3O4/mSiO2-Me-PTSA material was prepared (Qin et al, 2018a). The prepared Fe3O4/mSiO2-Me-PTSA material was used as MSPE sorbent for the efficient removal of polychlorinated biphenyls from wastewater samples.…”

A Carboxyl Group-Functionalized Ionic Liquid Hybrid Adsorbent for Solid-Phase Extraction and Determination of Trace Diclofenac Sodium in Milk Samples

“…Currently, several methods have been reported for the pretreatment of samples involving DS. Among them, solid-phase extraction has attracted remarkable attention due to its simple operation, low usage amount of organic solvent, and high recovery efficiency [10][11][12]. In this context, Soheili-Azad et al [13] reported a zinc/aluminum layered double hydroxide adsorbent (Zn/Al LDH) for the extraction and HPLC determination of trace DS from human serum and hospital wastewater.…”