ZrO2 nanoparticles confined in metal organic frameworks for highly effective adsorption of phosphate

Tao Liu; Jiankang Feng; Yuqiu Wan; Shourong Zheng; Liuyan Yang

doi:10.1016/j.chemosphere.2018.07.085

ZrO₂ nanoparticles confined in metal organic frameworks for highly effective adsorption of phosphate

Chemosphere. 2018 Nov:210:907-916. doi: 10.1016/j.chemosphere.2018.07.085. Epub 2018 Jul 18.

Authors

Tao Liu¹, Jiankang Feng¹, Yuqiu Wan¹, Shourong Zheng¹, Liuyan Yang²

Affiliations

¹ State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, China.
² State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, China. Electronic address: yangly@nju.edu.cn.

PMID: 30208550
DOI: 10.1016/j.chemosphere.2018.07.085

Abstract

Highly dispersed ZrO₂ particles confined in the MIL-101 (denoted as MIL-101@Zr(DS)) with varied ZrO₂ loading amounts were prepared by the double solvents method. For comparison, ZrO₂ loaded MIL-101 samples were synthesized by the conventional impregnation method (denoted as MIL-101@Zr(I)) and the deposition method (denoted as MIL-101@Zr(D)). The characterization results indicated that for MIL-101@Zr(DS), ZrO₂ particles were dominantly confined in MIL-101 with a much higher dispersion as compared with MIL-101@Zr(I) and MIL-101@Zr(D). The maximum phosphate adsorption capacity and ZrO₂ content normalized phosphate adsorption capacity of the MIL-101@Zr(DS) were 21.28 mg P·g^-1 and 1120.0 mg P·g^-1, respectively. Additionally, the ZrO₂ content normalized phosphate adsorption capacity was significantly larger than that for MIL-101@Zr(I) and MIL-101@Zr(D) as well as the reported values for other Zr-based adsorbents. The effects of solution chemistry on phosphate adsorption to MIL-101@Zr(DS), MIL-101@Zr(I) and MIL-101@Zr(D) were also examined. Compared with MIL-101@Zr(I) and MIL-101@Zr(D), the adsorption of phosphate on MIL-101@Zr(DS) was less affected by the coexistence of anions and dissolved humic acid. Increasing pH from 3 to 12 led to decreased phosphate adsorption capacity of MIL-101@Zr(DS) from 10.38 mg P·g^-1 to 2.03 mg P·g^-1. Accordingly, used MIL-101@Zr(DS) could be effectively regenerated under alkaline conditions and exhibited stable adsorption-desorption performance.

Keywords: Confinement; Double solvents method; Metal organic frameworks; Phosphate adsorption; ZrO(2).

MeSH terms

Adsorption
Metal-Organic Frameworks / chemistry*
Nanoparticles / chemistry*
Phosphates / chemistry*
Zirconium / chemistry*

Substances

Metal-Organic Frameworks
Phosphates
Zirconium
zirconium oxide