Growth of MOF@COF on corncob as effective adsorbent for enhancing adsorption of sulfonamides and its mechanism

玉米芯 吸附 化学 解吸 萃取(化学) 色谱法 化学工程 核化学 有机化学 原材料 工程类
作者
Nan Zhang,Tao Bao,Yan Gao,Xianliang Xu,Sicen Wang
出处
期刊:Applied Surface Science [Elsevier BV]
卷期号:580: 152285-152285 被引量:38
标识
DOI:10.1016/j.apsusc.2021.152285
摘要

[email protected] composite was fabricated for greater adsorption capacity through the utilization of corncob, which is a natural, sustainable, and cellulose-rich resource. An in-situ growth strategy was implemented to graft UiO-66-NH2 on carboxyl-terminal corncob induced by the thermal esterification of critic acid. Subsequently, [email protected]2@TpBD was constructed through the Schiff base reaction between 2,4,6-triformylphloroglucinol (Tp) and UiO-66-NH2 as well as benzidine (BD). The ratio of UiO-66-NH2 and TpBD was optimized to be 5:3 for enhancing adsorption capacity. Based on the π-π, hydrogen bonding, and -SO2-Zr-O- coordination effect, sulphonamides (SAs) were chosen to investigate the adsorption capacity of adsorbent using an in-syringe solid phase extraction (IS-SPE) method. The binding energy calculated using density functional theory (DFT) reached −37.45 Kcal/mol, which indicated the strong interactions between SAs and [email protected]2@TpBD. Combined with ultra-performance liquid chromatography (UPLC), a high sensitivity was obtained with low detection of 0.10 μg/L. The prepared [email protected]2@TpBD exhibited good reproducibility within relative standard deviations (RSDs) 3.1%-3.4% in intra-batch and 4.3%-8.4% in inter-batch. Moreover, the extraction capacity of adsorbent was not decreased in 20 recycles adsorption–desorption within RSDs 3.8%-8.5%. With features of permanent porosity, multiple active sites, and good renewability, [email protected]2@TpBD shows great potential towards industrial applications in the field of adsorption.
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