strongly affected by the nearest-neighbor distances of the MgO bond
[35–37]. Among the numerous heavy metal ions, Cu2+ (73 pm) has
the closest ionic radius to Mg2+ (72 pm). The same electrical charge
and similar ionic radius were of great benefit to their exchange.
Hence, the immobilization affinity of magnesium-containing apatite to
Cu2+ was larger than others. However, it is not an easy task to isolate
the nano-composites from aqueous solution.
Ferroferric oxide nano-particles play an important role in the field of
environment protection and remediation owing to their nano-meter
level size and the properties of being easily separated, collected and
reused by an external magnetic field [38,39]. Therefore, the secondary
pollution to water caused by adsorbent adsorbing some pollutants can
be avoided. Moreover, these materials can be recycled through simple
and high-efficiency method, which can effectively reduce the processing
cost. So, Fe3O4-based materials are very effective in the removal of
environmental pollutants. So far, the use of MgHAp/Fe3O4 composite
as an adsorbent for removal of Cu2+ has not been reported.
This work applied the simple method of co-precipitation to synthesize
a novel magnetic nano-composite by embedding ferroferric oxide
into magnesium hydroxyapatite. The present work tested the influence
of various experimental parameters on copper adsorption and determined
the optimum adsorption conditions. Adsorption mechanisms
including dynamics, thermodynamics and isotherms had also been analyzed.
In addition, the interference of coexistent metal cation and the
stability of nano-composites after adsorbing were investigated for
practical applications. All in all, the goal of this study was to develop
an innocuous, low cost and efficient magnetic nano-composite adsorbent
with high adsorption capacity and specificity for Cu2+.
strongly affected by the nearest-neighbor distances of the MgO bond[35–37]. Among the numerous heavy metal ions, Cu2+ (73 pm) hasthe closest ionic radius to Mg2+ (72 pm). The same electrical chargeand similar ionic radius were of great benefit to their exchange.Hence, the immobilization affinity of magnesium-containing apatite toCu2+ was larger than others. However, it is not an easy task to isolatethe nano-composites from aqueous solution.Ferroferric oxide nano-particles play an important role in the field ofenvironment protection and remediation owing to their nano-meterlevel size and the properties of being easily separated, collected andreused by an external magnetic field [38,39]. Therefore, the secondarypollution to water caused by adsorbent adsorbing some pollutants canbe avoided. Moreover, these materials can be recycled through simpleand high-efficiency method, which can effectively reduce the processingcost. So, Fe3O4-based materials are very effective in the removal ofenvironmental pollutants. So far, the use of MgHAp/Fe3O4 compositeas an adsorbent for removal of Cu2+ has not been reported.This work applied the simple method of co-precipitation to synthesizea novel magnetic nano-composite by embedding ferroferric oxideinto magnesium hydroxyapatite. The present work tested the influenceof various experimental parameters on copper adsorption and determinedthe optimum adsorption conditions. Adsorption mechanismsincluding dynamics, thermodynamics and isotherms had also been analyzed.In addition, the interference of coexistent metal cation and thestability of nano-composites after adsorbing were investigated forpractical applications. All in all, the goal of this study was to developan innocuous, low cost and efficient magnetic nano-composite adsorbentwith high adsorption capacity and specificity for Cu2+.
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