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Poly(Hydroxyethylmethacrylate-Ethyleneglycoldimethacrylate), poly(HEMA-EGDMA), microbeads with 150-200 microm in size, was prepared by suspension polymerization. Beta-cyclodextrin was modified onto the polymeric microbeads using glutaraldahyde activation in an acidic medium at pH=2.5. FT-IR and TGA were used for the characterization of modified polymers and the determination of the nature of the interaction between phenolic compounds and the modified polymeric microbeads. Plain and beta-cyclodextrin modified microbeads were used in adsorption-desorption studies of phenolic species in single solution. Adsorption capacities of the phenolic species onto the plain microbeads were found to be 28.2, 17.0, 14.3, 9.8, and 1.92 mg/g polymer for o-chloro phenol, p-nitro phenol, p-chloro phenol, o-nitro phenol, and phenol, respectively. However, for beta-cyclodextrin modified microbeads, adsorption capacity of phenolic species was determined as 274, 365, 128, 182, and 87 mg/g for phenol, o-nitro phenol, p-nitro phenol, o-chloro phenol, and p-chloro phenol, respectively. Desorption ratio for the phenolic species was more than 90%, except for o-nitro phenol. Detection limits of the phenolic species were improved at least 500-fold for UV-Vis spectrophotometric detection, after the pre-concentration of all phenolic species used in this study. Adsorption time for the phenolic species onto beta-cyclodextrin-modified poly(HEMA-EGDMA) microbeads was found to be reasonable short (10-60 min) and suitable for the applications. Also, synthesized microbeads were useful for the repeated use for the removal and pre-concentration of phenolic species. 相似文献
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Qureshi Tahira Memon Najma Memon Saima Q. Yavuz Handan Lachgar Abdesadek Denizli Adil 《Environmental science and pollution research international》2019,26(10):9796-9804
Environmental Science and Pollution Research - Pharmaceutically active compounds like diclofenac (DFS), ibuprofen (IBP), and other drugs that persist in the environment are listed as emerging... 相似文献
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Fatih Evrendilek Haluk Denizli Hakan Yetis Nusret Karakaya 《Environmental monitoring and assessment》2013,185(7):5577-5583
Concentrations of outdoor radon-222 (222Rn) in temperate grazed peatland and deciduous forest in northwestern Turkey were measured, compared, and modeled using artificial neural networks (ANNs) and multiple nonlinear regression (MNLR) models. The best-performing multilayer perceptron model selected out of 28 ANNs considerably enhanced accuracy metrics in emulating 222Rn concentrations relative to the MNLR model. The two ecosystems had similar diel patterns with the lowest 222Rn concentrations in the afternoon and the highest ones near dawn. Mean level (5.1?+?2.5 Bq?m?3 h?1) of 222Rn in the forest was three times smaller than that (15.8?+?9.7 Bq?m?3) of 222Rn in the peatland. Mean 222Rn level had negative and positive relationships with air temperature and relative humidity, respectively. 相似文献
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