Adsorption Properties of CS/PAM/Fe(III) Complex for Phosphate Removal from Water

Tian Cao; Wei Li; Lin Ren; Tao Song; Jie Song; Jiacheng Lin; Li Yang; Wenxiu Liu; Ping Wang; Shaojie Feng

doi:10.1007/s11595-025-3075-y

Journal of Wuhan University of Technology Materials Science Edition ›› 2025, Vol. 40 ›› Issue (2) : 382 -388. DOI: 10.1007/s11595-025-3075-y

Advanced Materials

Adsorption Properties of CS/PAM/Fe(III) Complex for Phosphate Removal from Water

Tian Cao ¹^,²^,³^,^a
, Wei Li ¹^,²^,³
, Lin Ren ¹^,²^,³
, Tao Song ¹^,²^,³
, Jie Song ¹^,²^,³
, Jiacheng Lin ¹^,²^,³
, Li Yang ¹^,²^,³
, Wenxiu Liu ¹^,²^,³
, Ping Wang ¹^,²^,³
, Shaojie Feng ¹^,²^,³

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Abstract

The adsorption of phosphate was conducted by the complex of chitosan/polyacrylamide/ferric(CS/PAM/Fe(III)) prepared. The SEM images and XPS spectra confirmed the successful adsorption of phosphate. The adsorption process was studied by varying the influencing aspects like pH, co-existing ions, contact time, and initial phosphate concentration. The experimental results indicate that the adsorptive capacity decreases with the increase of pH. However, it is commendable that there is still a adsorption capacity of more than 5 mg/g when the pH is 8–11. The adsorption kinetics can be accurately described by the pseudo-second-order model and is controlled by both chemisorption and surface diffusion. The adsorption process is a single layer adsorption. This paper proposed that the adsorption mechanism of CS/PAM/Fe(III) complex is the joint action of electrostatic attraction and ligand exchange.

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Tian Cao, Wei Li, Lin Ren, Tao Song, Jie Song, Jiacheng Lin, Li Yang, Wenxiu Liu, Ping Wang, Shaojie Feng. Adsorption Properties of CS/PAM/Fe(III) Complex for Phosphate Removal from Water. Journal of Wuhan University of Technology Materials Science Edition, 2025, 40(2): 382-388 DOI:10.1007/s11595-025-3075-y