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The Sorption Performance of Cetyl Trimethyl Ammonium Bromide-Capped La0.9Sr0.1FeO3 Perovskite for Organic Pollutants from Industrial Processes
Molecules ( IF 4.6 ) Pub Date : 2020-04-02 , DOI: 10.3390/molecules25071640
Shimaa M Ali 1, 2 , Areej A Eskandrani 2
Affiliation  

La0.9Sr0.1FeO3 perovskite, prepared by the microwave-assisted method, was capped with cetyl trimethyl ammonium bromide (CTAB) cationic surfactant, and applied as a sorbent for the removal of the anionic Congo red (CR) dye from aqueous solutions. X-ray diffraction (XRD) patterns showed that the perovskite structure was not affected by capping; however, the particle size increased. There was a hipsochromic shift in the value of λmax of the CR absorption spectrum in the presence of CTAB, which indicated the formation of an oppositely charged dye–surfactant complex. The adsorption efficiency of CTAB-capped La0.9Sr0.1FeO3 was independent of the pH of the solution—equilibrium was reached after a few minutes. The value of the maximum adsorption capacity, qm, was 151.52 mg·g−1, which was 10-times higher than that of the pure perovskite. The proposed sorbent maintained its excellent sorption ability in the presence of the sample matrix; therefore, it can be regenerated and reused with unchanged performance.

中文翻译:

十六烷基三甲基溴化铵封端的 La0.9Sr0.1FeO3 钙钛矿对工业过程有机污染物的吸附性能

通过微波辅助方法制备的 La0.9Sr0.1FeO3 钙钛矿用十六烷基三甲基溴化铵 (CTAB) 阳离子表面活性剂包覆,并用作吸附剂以去除水溶液中的阴离子刚果红 (CR) 染料。X射线衍射(XRD)图显示钙钛矿结构不受封端影响;然而,颗粒尺寸增加了。在 CTAB 存在的情况下,CR 吸收光谱的 λmax 值发生了随色移,这表明形成了带相反电荷的染料 - 表面活性剂复合物。CTAB 封端的 La0.9Sr0.1FeO3 的吸附效率与溶液的 pH 值无关——几分钟后达到平衡。最大吸附容量 qm 值为 151.52 mg·g-1,是纯钙钛矿的 10 倍。所提出的吸附剂在样品基质存在的情况下保持其优异的吸附能力;因此,它可以在性能不变的情况下再生和重复使用。
更新日期:2020-04-02
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