A fast and highly selective Congo red adsorption material based on a cadmium-phosphonate network. Issue 12 (19th June 2019)

• Record Type: Journal Article
• Authors: Ai, Jing; Tian, Hong-Rui; Min, Xue; Wang, Zi-Chuan; Sun, Zhong-Ming
• Is Part Of: Dalton transactions. Volume 49:Issue 12(2020)
• Page Start: 3700
• Page End: 3705
• Publication Date: 2019-06-19
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c9dt01545k
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : This cadmium-phosphonate network exhibited rapid and efficient adsorption of Congo red dye, as well as excellent structural stability and adsorptive recyclability. Abstract : In this work, a cadmium-phosphonate network was prepared based on a tetrahedral shaped tetraphosphonic acid linker. The resulting three-dimensional compound Cd4 (H4 L)2 (phen)2 (H2 O)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.