In-situ growth of nano-sized Mg (OH) 2 on sepiolite and its application on simultaneous removal of nutrients from waste water through MAP crystallization
ZHANG Feng
DU Yucheng
LI Yang
LI Qiang
JIN Cuixin
NIU Yan
Abstract：Brucite nanoflakes were deposited in-situ on sepiolite fiber (MSEP) via a hydrothermal method, and were applied for simultaneous recovery of phosphate and ammonium from waste water.Different reaction conditions including adsorbent dosage, solution p H and contact time were investigated.Precipitates collected were characterized by SEM, TEM, XRD, SEM-EDS and FTIR.The results show that MSEP exhibits a high equilibrium adsorption capacity reaching 62.52mg/g of ammonium and 115.68 mg/g of phosphate at adsorbent dosage of 1.0 g/L, initial p H of 7.5 and contact time of40 min.The MSEP adsorption kinetics follows the pseudo-second-order kinetic model (R2>0.99) .Characterization of precipitates reveals the main mechanism of phosphate and ammonium recovery by MSEP is magnesium ammonium phosphate crystallization.
Keywords：nutrients recoverymagnesium ammonium phosphatesepiolitebrucitein-situ growth
Publication Date：2019-01-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 28-34 )