Phosphorus removal and recovery from water with macroporous bead adsorbent constituted of alginate-Zr4+ and PNIPAM-interpenetrated networks.
Currently, there is a growing trend in employing natural biomaterials (e.g., alginate) to prepare a novel bead adsorbent for phosphorus (P) elimination. However, the utilization of alginate beads to remove and recover P from effluents possesses limitations associated with its physical characteristics such as a dense gel layer, poor mechanical strength and low stability. To overcome the limitations and improve the adsorption performances, we synthesized a novel alginate-derived bead constituted of PNIPAM network interpenetrated in alginate-Zr4+ network (PNIPAM/SA-Zr) decorated with polyethylene glycol as a pore-forming agent, and then investigated its ability to remove and recover P from effluents. The morphology, functional groups, surface area, and mechanical strength of the beads were evaluated by SEM, FTIR, BET, and swelling analysis. The adsorption of P was investigated by varying various factors. The adsorption kinetics, isotherms, and thermodynamics were studied. Particularly, the P-loaded beads exhibited a faster desorption rate under thermal stimulus, and remained good desorption efficiency and reusability within five consecutive cycles. Zeta-potential and XPS results revealed that the adsorption mechanisms were related to electrostatic interactions, ligand exchange, and the formation of inner-sphere complexes. The beads possessed favorable fixed-bed column operation performances for P removal and recovery from real wastewater.
['Luo|Huayong|H|', 'Zeng|Xueyang|X|', 'Liao|Peng|P|', 'Rong|Hongwei|H|', 'Zhang|Tian C|TC|', 'Jason Zhang|Z|Z|', 'Meng|Xiangchao|X|']
D000180:Acrylic Resins D000327:Adsorption D000464:Alginates D006863:Hydrogen-Ion Concentration D007477:Ions D007700:Kinetics D008024:Ligands D008863:Microspheres D008962:Models, Theoretical D010758:Phosphorus D056951:Photoelectron Spectroscopy D011092:Polyethylene Glycols D016062:Porosity D012212:Rheology D013696:Temperature D062065:Waste Water D014867:Water D014874:Water Pollutants, Chemical D015040:Zirconium
Phosphorus Alginate beads Adsorption