Preparation of polyvinyl alcohol hydrogel modified with environment-friendly pomegranate peel polyphenols: An efficient and regenerative adsorbent for Congo red adsorption

IF 4.7 3区材料科学 Q2 CHEMISTRY, PHYSICAL

Colloid and Interface Science Communications Pub Date : 2024-04-17 DOI:10.1016/j.colcom.2024.100786

Qihua Zhou , Fei He , Rui Zhao , Yating Xu , Xiongzi Dong , Na Li , Yanzhen Lu , Richun Rao

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Abstract

This study reports the fabrication of polyvinyl alcohol (PVA) based hydrogel with pomegranate peel polyphenols (PPP) via the freezing-thawing cycles method, employed as a cost-effective and efficient Congo Red (CR) adsorbent. Numerous techniques, including TGA, SEM, FTIR, XRD, DLS, BET, together with universal stretching machine, were employed to confirm the successful synthesis of PVA/PPP hydrogels with porous structures. When compared to pure PVA hydrogel, the PVA/PPP hydrogels showed greater adsorption capabilities for CR. The kinetic data coincided with pseudo-second-order modeling (R² = 0.9927). Freundlich isotherm modeling was highly-conformed through adsorption (R² = 0.9985). CR adsorption appeared to be exothermic and spontaneous, according to the thermodynamic study. Moreover, following five consecutive runs, adsorption effectiveness for PVA/PPP hydrogels remained above 88%, demonstrating their exceptional reusability. The mechanisms analysis revealed that the CR adsorption was facilitated by electrostatic attraction, hydrogen bonding, together with π-π stacking interplays.

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用环保型石榴皮多酚改性的聚乙烯醇水凝胶的制备：一种吸附刚果红的高效再生吸附剂

本研究报道了通过冷冻-解冻循环法制备聚乙烯醇（PVA）基水凝胶和石榴皮多酚（PPP），并将其用作一种经济高效的刚果红（CR）吸附剂。采用 TGA、SEM、傅立叶变换红外光谱、XRD、DLS、BET 等多种技术和万能拉伸机成功合成了具有多孔结构的 PVA/PPP 水凝胶。与纯 PVA 水凝胶相比，PVA/PPP 水凝胶对 CR 具有更强的吸附能力。动力学数据与伪二阶模型相吻合（R2 = 0.9927）。Freundlich 等温线模型与吸附高度吻合（R2 = 0.9985）。根据热力学研究，CR 吸附似乎是放热和自发的。此外，在连续运行五次后，PVA/PPP 水凝胶的吸附效力仍保持在 88% 以上，表明其具有优异的重复使用性。机理分析表明，静电吸引、氢键以及 π-π 堆积相互作用促进了 CR 的吸附。

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来源期刊

Colloid and Interface Science Communications Materials Science-Materials Chemistry

CiteScore

9.40

自引率

6.70%

发文量

125

审稿时长

43 days

期刊介绍： Colloid and Interface Science Communications provides a forum for the highest visibility and rapid publication of short initial reports on new fundamental concepts, research findings, and topical applications at the forefront of the increasingly interdisciplinary area of colloid and interface science.