Mesoporous Magnetic/Polymer Hybrid Nanoabsorbent for Rapid and Efficient Removal of Heavy Metal Ions from Wastewater

Abstract

As an advanced water purification technology, magnetic nanoabsorbents are highly attractive for their sustainability, robustness, and energy efficiency. However, magnetic responsiveness and high adsorptive capacity are irreconcilable during the design and synthesis of a high-performance magnetic nanoabsorbent. Here, we address this issue by designing a kind of mesoporous magnetic polymer hybrid microspheres, where functional polymers such as polyrhodanine and polypyrrole were attached to the pore walls in the interior of mesoporous Fe 3 O 4 microspheres through in situ polymerization. Due to the integrated large saturation magnetic moment, porous structure, and dense polymer layer, the mesoporous magnetic polymer hybrid microspheres demonstrated fast magnetic responsiveness, excellent recycling performance, and high adsorption capacities toward Pb(II) ions (189 mg g −1 ) for polyrhodanine and Cr(VI) ions (199 mg g −1 ) for polypyrrole. Furthermore, their potential application in wastewater treatment was verified by a self-made magnetic separation column, where the designed magnetic nanoabsorbent exhibits significant advantages including rapid separation of heavy metal ions and high outflow. This study provided a promising magnetic polymer hybrid nanoabsorbent for realizing efficient removal of heavy metal ions from wastewater.

Amino-Functionalized Lotus Stem Hydrochar for Rapid Adsorption and In Situ Detoxification of Cr(VI) from Water

“…Among these methods, adsorption is considered to be an effective and promising method due to its inexpensive cost, ease of use, and excellent removal efficiency . For example, materials such as the millimeter-scale hollow microsphere by modifying aluminum-mediated carboxymethylcellulose microspheres (CMC-Al) with polyethylenimine, mesoporous magnetic polymer hybrid microsphere, and iron-modified biochar (Fe@MBC) are effective in removing Cr­(VI) from water by adsorption. The key to adsorption is the development of efficient, stable, and low-cost adsorbents.…”