Recovery of Bisphenol A by pH-Triggered Magnetic Nanoparticles

Abstract

Bisphenol A is not only one of the frequent contaminants of industrial wastewater, but also one of the main ingredients in polycarbonate and epoxy resins. This study synthesizes a pH-triggered Fe3O4@mSiO2@DPDES adsorbent for recycling Bisphenol A through adsorption–desorption process. Due to the strong [Formula: see text]–[Formula: see text] interaction between the phenyl groups in diphenyldiethoxysilane modified magnetic nanoparticles (MNPs) and Bisphenol A, absorbance reached 120.17[Formula: see text]mg/g at pH 7, allowing the bisphenol A adsorbed to Fe3O4@mSiO2@DPDES to be trivially separated from aqueous solutions with a magnet. Desorption of the adsorbed bisphenol A in aqueous solution occurred at pH 2, allowing an impressive 95% recovery rate. The durability of the Fe3O4@mSiO2@DPDES adsorbent was tested by repeated separation of bisphenol A from an aqueous solution, with the recovery efficiency remaining greater than 85% after five cycles.

Enhanced Removal of Dissolved Humic Acid from Water Using Eco‐Friendly Phenylalanine‐Modified‐Chitosan Fe3O4 Magnetic Nanoparticles

“…Figure shows that the saturation magnetization of Fe 3 O 4 , Fe 3 O 4 @chitosan and Fe 3 O 4 @chitosan@Phe is 81.7, 64.6 and 46.3 emu/g, respectively, indicating these magnetic particles are superparamagnetic. Although the magnetic saturation value decreases with the presence of chitosan and phenylalanine, the magnetic saturation value of the prepared Fe 3 O 4 @chitosan@Phe is still large and suitable for magnetic separation and potentiality for recycling …”

“…With the rapid development of nanoscience, a variety of magnetic nanomaterials have been successfully designed and synthesized for the treatment of environmental pollution . Magnetic Fe 3 O 4 nanoparticles have attracted wide attention due to their advantages of relatively simple preparation process, low price, low toxicity, functional controllability and easily separation in the magnetic field .…”