Issue 27, 2019

Synthesis of mesoporous lanthanum hydroxide with enhanced adsorption performance for phosphate removal

Abstract

Phosphate is a ubiquitous pollutant in aquatic systems, and increasingly stringent post-treatment phosphate effluent standards necessitate increasingly efficient removal techniques. In this study, mesoporous lanthanum hydroxide (MLHO) was synthesized by a hard-template method using ordered mesoporous silica, and its potential as an adsorbent for high-efficiency phosphate removal in aqueous solutions was tested. The porosity characteristics of MLHOs were controlled by adjusting the template structure and synthesis conditions. MLHO adsorbents showed great potential for phosphate removal from solutions containing both high and low initial phosphate concentrations. The phosphate adsorption capacity of MLHO strongly depended on its surface area as this process was governed by monolayer adsorption. Moreover, the phosphate removal performance of MLHO was affected by its structural properties. MLHO showed a high adsorption capacity of 109.41 mg P g−1 at 28 °C (qm by the Langmuir isotherm model). Further, it showed ultrafast adsorption in a solution with low initial concentration of 2 mg P/L; within the first 10 min, 99.8% of phosphate was removed, and the phosphorus concentration remaining in the solution dramatically reduced to 4 μg P/L. These findings suggest that MLHO adsorbent is a good candidate for rapid and efficient low-concentration phosphate removal to meet the increasingly stringent discharge standards for wastewater treatment plants.

Graphical abstract: Synthesis of mesoporous lanthanum hydroxide with enhanced adsorption performance for phosphate removal

Supplementary files

Article information

Article type
Paper
Submitted
01 2 2019
Accepted
29 4 2019
First published
16 5 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 15257-15264

Synthesis of mesoporous lanthanum hydroxide with enhanced adsorption performance for phosphate removal

K. Kim, D. Kim, T. Kim, B. Kim, D. Ko, J. Lee, Y. Han, J. C. Jung and H. B. Na, RSC Adv., 2019, 9, 15257 DOI: 10.1039/C9RA00895K

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