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Synthesis and Exfoliation of Discotic Zirconium Phosphates to Obtain Colloidal Liquid Crystals
Published on: May 25, 2016
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Study of phosphate removal from aqueous solution by zinc oxide
Zhen Luo1, Suiyi Zhu1, Zhongmou Liu1
1School of Environment, Northeast Normal University, Changchun 130117, China
Journal of Water and Health
|September 1, 2015
Summary
Zinc oxide effectively removes phosphate from water, with optimal performance at pH 6.2. This study details the adsorption mechanism and capacity of zinc oxide (ZnO) for phosphate remediation.
Area of Science:
- Environmental Chemistry
- Materials Science
- Water Treatment
Background:
- Phosphate pollution in aqueous solutions poses environmental risks.
- Developing efficient adsorbents for phosphate removal is crucial for water purification.
Purpose of the Study:
- To synthesize zinc oxide (ZnO) nanoparticles.
- To investigate the mechanism and kinetics of phosphate adsorption onto ZnO.
- To determine the maximum phosphate adsorption capacity and influencing factors.
Main Methods:
- Characterization of ZnO using X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy.
- Batch adsorption experiments to study kinetics, isotherms, pH effects, and co-existing anions.
- Determination of the point of zero charge (pHpzc) via the pH-drift method.
Main Results:
- Adsorption equilibrium was reached within 150 minutes, following pseudo-second-order kinetics.
- Maximum phosphate adsorption capacity was 163.4 mg/g at 298 K and pH 6.2±0.1.
- Phosphate adsorption is endothermic and spontaneous, with capacity decreasing at higher pH.
- Ligand exchange and Lewis acid-base interactions govern adsorption; carbonate inhibits removal.
Conclusions:
- Zinc oxide is a highly effective adsorbent for phosphate removal from aqueous solutions.
- The adsorption mechanism involves ligand exchange and Lewis acid-base interactions, influenced by pH.
- Co-existing anions like nitrate, sulfate, and chloride have minimal impact, unlike carbonate.
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