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Adsorption of Sr(II) from water by mercerized bacterial cellulose membrane modified with EDTA
- Cheng, Rong, Kang, Mi, Zhuang, Shuting, Shi, Lei, Zheng, Xiang, Wang, Jianlong
- Journal of hazardous materials 2019 v.364 pp. 645-653
- EDTA (chelating agent), Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, adsorbents, adsorption, cellulose, kinetics, mercerization, models, moieties, scanning electron microscopy, sorption isotherms, strontium, tertiary amines, wastewater
- The treatment of low-level radioactive wastewater is a critical and considerable challenge. Bacterial cellulose membrane (BCM) modified with ethylenediaminetetraacetic acid (EDTA) using (3-aminopropyl) triethoxysilane (APTES) as a crosslinker were used to remove Sr2+ in this work. SEM, XPS, and FTIR were used to characterize the morphology, structure, chemical shift, and functional groups of the as-prepared adsorbent. The synthesized BCM@APTES-EDTA presented a three-layer structure of membrane-net-membrane with nano-sized fibers (<100 nm). The adsorption of Sr2+ onto BCM@APTES-EDTA was investigated as a function of contact time and initial concentration of Sr2+. Results showed that the adsorption of Sr2+ followed the pseudo second-order kinetic model (R2 = 0.999), and fitted well with the Langmuir isotherm model (R2 = 0.996). The maximum adsorption capacity was calculated to be 44.86 mg g−1, which was comparable to other adsorbents. Additionally, the mechanism of Sr2+ adsorbed by the as-prepared adsorbent was studied through FTIR and XPS analysis, which indicated that the tertiary amines and carboxylate from grafted EDTA participated in the adsorption of Sr2+.