Fabrication of PVA Nanofibers Grafted with Octaamino-POSS and their Application in Heavy Metal Adsorption
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ORIGINAL PAPER
Fabrication of PVA Nanofibers Grafted with Octaamino‑POSS and their Application in Heavy Metal Adsorption Yao He1 · Huafeng Tian1,2 · Aimin Xiang1 · Hailiang Wang1 · Jinlong Li3 · Xiaogang Luo4,5 · A. Varada Rajulu6
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Wastewater treatment is one of the focuses in current society, and the removal of heavy metal ions from it is crucial in wastewater treatment. Polyvinyl alcohol (PVA) nanofibers play a certain role in the adsorption of heavy metal ions, but their adsorption capacity is limited. In this work, maleic anhydride (MAH) was first grafted onto the molecular chain of PVA. Then through the condensation of the carboxyl group and the amino group, the octaamino-POSS was successfully grafted on the PVA molecular chain. Two kinds of nanofibers, PVA/octaamino-POSS nanofibers as well as PVA-g-POSS nanofibers, were fabricated by electrospinning technology for the adsorption of P b2+ and C u2+ in wastewater. The preparation of PVA/ octaamino-POSS was used to compare which metal ion adsorption process was more stable, physical blending or chemical grafting. With the increase of contact time, the adsorption capacity of PVA/octaamino-POSS nanofibers to C u2+ increased at first and then decreased. It was observed that the adsorption capacity of PVA-g-POSS to heavy metal ions was higher than that of PVA/octaamino-POSS. With the increase of octaamino-POSS content, the equilibrium adsorption of P b2+ and C u2+ 2+ on PVA-g-POSS nanofibers was significantly improved, with prominent adsorption effect for C u . Based on the analysis of quasi-first-order and quasi-second-order dynamic equation, it was deduced that the chemical adsorption and physical adsorption worked together in the adsorption process of Pb2+ and C u2+ by PVA-g-POSS, and chemical adsorption played a major role. Keywords Poly (vinyl alcohol) · Electrospinning · Octaamino-POSS · Heavy metal adsorption
Introduction Heavy metal pollution in wastewater has caused people’s attention due to environmental pollution and its harm to human health. But the need of the hour prompts one to look for cost-effective and environmentally-friendly methods. Existing heavy metal treatment methods include adsorption,
* Huafeng Tian [email protected] * Aimin Xiang [email protected] 1
2
Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, College of Chemistry and Materials Engineering of Beijing Technology and Business University, Beijing 100048, People’s Republic of China State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, People’s Republic of China
flocculation, membrane separation, chemical reduction, and biological methods [1–4]. Among them, activated carbon is considered to be an effective adsorbent in terms of cost and performance. It can be achieved through physical adsorption and chemical adsorption between heavy metal ions and oxygen-containing functiona
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