1 research outputs found
Highly Efficient Phosphate Sequestration in Aqueous Solutions Using Nanomagnesium Hydroxide Modified Polystyrene Materials
Phosphate
removal is important for the control of eutrophication, and adsorption
may serve as a powerful supplement to biological phosphate sequestration.
Here, we develop a new composite adsorbent (denoted as HMO-PN) by
encapsulating active nano-MgÂ(OH)<sub>2</sub> onto macroporous polystyrene
beads modified with fixed quaternary ammonium groups [CH<sub>2</sub>N<sup>+</sup>(CH<sub>2</sub>)<sub>3</sub>Cl]. The N<sup>+</sup>-tailored
groups can accelerate the diffusion of target phosphate through electrostatic
attractions. The performance of the as-prepared HMO-PN was found to
depend on the pH value of an aqueous medium. HMO-PN also exhibits
high sorption selectivity toward the target phosphate. Kinetic equilibrium
of phosphate adsorption can be achieved within 100 min, and the calculated
maximum adsorption capacity is approximately 1.47 mmol/g (45.6 mg/g).
Column experiments further show that the effluent concentration of
phosphate can be reduced to below 0.5 mg/L (500 BV), suggesting highly
efficient phosphate sequestration. Moreover, the exhausted HMO-PN
can be readily regenerated using an alkaline brine solution