Issue 12, 2020

A fast and highly selective Congo red adsorption material based on a cadmium-phosphonate network

Abstract

In this work, a cadmium-phosphonate network was prepared based on a tetrahedral shaped tetraphosphonic acid linker. The resulting three-dimensional compound Cd4(H4L)2(phen)2(H2O)4 (1) exhibited a rapid and efficient adsorption of Congo red (CR) dye, the adsorption capacity of which reached 684 mg gāˆ’1. Furthermore, this adsorbent showed excellent structural stability and adsorptive recyclability after three times of adsorption and desorption. The absorption kinetics fitted well with the pseudo-second-order kinetic model, revealing that the adsorption of the cadmium-phosphonate compound undergoes a chemical process, where hydrogen bonding between the amide groups (from CR) and the uncoordinated phosphonate oxygen atoms of the compound plays a pivotal role.

Graphical abstract: A fast and highly selective Congo red adsorption material based on a cadmium-phosphonate network

Supplementary files

Article information

Article type
Paper
Submitted
11 Apr 2019
Accepted
05 Jun 2019
First published
05 Jun 2019

Dalton Trans., 2020,49, 3700-3705

A fast and highly selective Congo red adsorption material based on a cadmium-phosphonate network

J. Ai, H. Tian, X. Min, Z. Wang and Z. Sun, Dalton Trans., 2020, 49, 3700 DOI: 10.1039/C9DT01545K

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