Hierarchically Porous and Magnetic MgFe₂O₄@MgAl‐LDHs Microspheres Synthesized by a Bio‐Templating Strategy for Efficient Removal of Congo Red from Water**

Abstract

LDHs (Layered double hydroxides) has broad application prospects as adsorbent. Herein, a facile bio‐template route was developed using pine pollens to fabricate a novel 3D hierarchical MgFe2O4@MgAl‐LDHs adsorbent for rapid removal of organic pollutant from water. The agglomeration of the LDH sheets was prevented and evenly distributed over the surface of MgFe2O4 which resulting in large surface area (108.660 m2 g−1). The adsorption and regeneration of the adsorbent were examined. The as‐prepared MgFe2O4@MgAl‐LDHs exhibited excellent adsorption capacity (191.20 mg g−1) for Congo Red and still remained 81.61 % (156.03 mg g−1) of the first time after regenerated 3 times with methanol. Additionally, it could be conveniently recycled via an external magnetic field. The high adsorption capacity, easy recycling, and the low‐cost and readily available biomass made MgFe2O4@MgAl‐LDHs attractive for water remediation.

Adsorption and Visible Photocatalytic Synergistic Removal of a Cationic Dye with the Composite Material BiVO4/MgAl–LDHs

“…where C 0 (mg•L −1 ) is the initial concentration of the methylene blue solution, R(%) is the MB adsorption efficiency during the dark adsorption stage, C 1 (mg In Figure 3a, the XRD patterns of BiVO 4 , MgAl-LDHs, and BiVO 4 /MgAl-LDHs show that all of the diffraction peaks of pure BiVO 4 are consistent with the BiVO 4 monoclinic phase (PDF #14-0688) [36,37]. The diffraction peaks for the MgAl-LDHs exhibited high intensities and indicated distinct separation of the crystal planes, suggesting high crystallinity and regularity between the layers [38].…”