Efficient Removal of Chromium(VI) Anionic Species and Dye Anions from Water Using MOF-808 Materials Synthesized with the Assistance of Formic Acid.

Francesco Di Renzo,Nam T. S. Phan,Ha V. Le,Thuyet L. D. Pham,Philippe Trens,Khoa D. Nguyen,Phuong D. Vu,Phuoc H. Ho

doi:10.3390/nano11061398

Abstract

This study presents a simple approach to prepare MOF-808, an ultra-stable Zr-MOF constructed from 6-connected zirconium clusters and 1,3,5-benzene tricarboxylic acid, with tailored particle sizes. Varying the amount of formic acid as a modulator in the range of 200–500 equivalents results in MOF-808 materials with a crystal size from 40 nm to approximately 1000 nm. Apart from the high specific surface area, a combination of a fraction of mesopore and plenty of acidic centers on the Zr-clusters induces a better interaction with the ionic pollutants such as K2Cr2O7 and anionic dyes. MOF-808 shows uptakes of up to 141.2, 642.0, and 731.0 mg/g for K2Cr2O7, sunset yellow, and quinoline yellow, respectively, in aqueous solutions at ambient conditions. The uptakes for the ionic dyes are significantly higher than those of other MOFs reported from the literature. Moreover, the adsorption capacity of MOF-808 remains stable after four cycles. Our results demonstrate that MOF-808 is a promising ideal platform for removing oxometallates and anionic dyes from water.

Highlights

Oxometallates and anionic dyes originating from industries such as steel production, textile manufacturing, and paint- and ink-making have emerged as one of the most significant sources of water pollution [1,2,3]
The MOF-808 structure was constructed from 6-connected zirconium clusters and
The presence of modulator molecules is of paramount importance in controlling the coordination geometry of Zr-cluster and subsequently significantly affecting the crystallinity, morphology, and crystal size of the zirconium-based MOFs [16,29]

Summary

Introduction

Oxometallates and anionic dyes originating from industries such as steel production, textile manufacturing, and paint- and ink-making have emerged as one of the most significant sources of water pollution [1,2,3]. Their presence in large amounts in wastewater can cause serious health problems, such as allergies, cancer, and gene mutations [3,4]. Introducing new materials as environmentally friendly and efficient adsorbents to remove oxometallates and anionic dyes from aqueous solutions is highly essential [15]

Methods

Results

Conclusion