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Phosphate adsorption from aqueous solution by lanthanum-iron hydroxide loaded with expanded graphite.

Ling Zhang¹, SuWan Jin¹, Yong Wang¹

¹a School of Environmental and Chemical Engineering , Shanghai University , Shanghai , People's Republic of China.

Environmental Technology

|April 11, 2017

Summary

A new adsorbent, expanded graphite loaded with lanthanum (III)-iron (III) hydroxide (EG-LaFe), effectively removes phosphate. This material shows high selectivity and adsorption capacity, indicating its potential for water purification.

Keywords:

Phosphate removal adsorption expanded graphite lanthanum–iron bimetal composite mechanism

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Area of Science:

Environmental Chemistry
Materials Science
Water Treatment

Background:

Phosphate pollution poses a significant threat to aquatic ecosystems.
Effective removal of phosphate from water is crucial for environmental protection.
Developing novel adsorbents with high efficiency and selectivity is essential.

Purpose of the Study:

To prepare and characterize a novel adsorbent, expanded graphite loaded with lanthanum (III)-iron (III) hydroxide (EG-LaFe), for phosphate removal.
To optimize the preparation conditions for EG-LaFe.
To investigate the adsorption performance and mechanism of EG-LaFe for phosphate removal.

Main Methods:

Preparation and characterization of EG-LaFe adsorbent.
Optimization of adsorbent preparation using single-factor experiments.
Investigation of adsorption kinetics, isotherms, thermodynamics, and selectivity.
Analysis of adsorption mechanisms using pH studies, SEM, and FTIR.

Main Results:

The optimal preparation conditions for EG-LaFe were determined.
EG-LaFe exhibited excellent adsorption kinetics, fitting the pseudo-second-order model.
Adsorption isotherms were well-described by the Langmuir model, indicating monolayer adsorption.
Thermodynamic analysis revealed spontaneous and endothermic adsorption.
EG-LaFe demonstrated high selectivity for phosphate removal over coexisting ions.
Adsorption mechanisms included replacement of surface hydroxyl groups, electrostatic interaction, and Lewis acid-base interaction.

Conclusions:

EG-LaFe is a highly effective adsorbent for phosphate removal from water.
The adsorption process is governed by chemisorption and follows Langmuir and pseudo-second-order kinetics.
EG-LaFe shows promising potential for practical applications in water treatment due to its high selectivity and capacity.