Work

Preparation of a Cross‐Linked Al(OH) 3 /PVA/PVP Composite and Its Study on the Removal Ability of Fluoride Ion From Wastewater

Year: 2026

Type: article

Abstract: ABSTRACT With the development of fluorinated waste treatment and the extraction of metals such as rare earths, high‐density F − wastewater becomes a potential threat. Compared to inorganic adsorbents for F − removal with high cost due to agglomeration, this paper firstly utilizes maleic anhydride to control pH and achieves cross‐linked PVA/PVP as polymer matrix and in situ synthesized Al(OH) 3 (ATH) as inorganic particles simultaneously, and obtains cross‐linked ATH/PVA/PVP composite films with good mechanical property and excellent F − removal capability. With the increasing ATH contents of ATH/PVA/PVP composites, the initial decomposition temperature improves from 253°C to 262°C. The SEM shows that the in situ synthesized ATH can be relatively evenly distributed on the surface and inside the ATH/PVA/PVP composite with a diameter of 8–30 μm. For the ATH/PVA/PVP composite, the most suitable pH for F − adsorption is 5, and the adsorption capacity can reach 34.9 mg/g, and the F − removal efficiency can reach 98.07%. The F − removal of ATH/PVA/PVP composite can still remain 79.8% after five times regeneration, and interfering ions such as Cl − , NO 3 − have little effect on the F − removal. The Young's modulus and tensile strength of the ATH/PVA/PVP composite can remain 6.2 GPa and 10.1 MPa even at 25 wt% ATH contents.

Source: Journal of Applied Polymer Science

DOI: 10.1002/app.70336