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Issue 12, 2020
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A fast and highly selective Congo red adsorption material based on a cadmium-phosphonate network

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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 g−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

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Article information


Submitted
11 Apr 2019
Accepted
05 Jun 2019
First published
05 Jun 2019

Dalton Trans., 2020,49, 3700-3705
Article type
Paper

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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