Adsorption Properties and Mechanism of Attapulgite to Graphene Oxide in Aqueous Solution

Na Li, Jiyuan Fang, Ping Jiang, Cuihong Li, Haibo Kang and Wei Wang
Additional contact information
Na Li: School of Civil Engineering, Shaoxing University, Shaoxing 312000, China
Jiyuan Fang: School of Civil Engineering, Shaoxing University, Shaoxing 312000, China
Ping Jiang: School of Civil Engineering, Shaoxing University, Shaoxing 312000, China
Cuihong Li: School of Civil Engineering, Shaoxing University, Shaoxing 312000, China
Haibo Kang: School of Civil Engineering, College of Transportation Engineering, Nanjing Tech University, Nanjing 210009, China
Wei Wang: School of Civil Engineering, Shaoxing University, Shaoxing 312000, China

IJERPH, 2022, vol. 19, issue 5, 1-16

Abstract: In order to remove toxic graphene oxide (GO) from aqueous solution, attapulgite (ATP) was used as adsorbent to recycle it by adsorption. In this paper, the effects of different pH, adsorbent mass, GO concentration, time and temperature on the adsorption of GO by attapulgite were studied, and the adsorption performance and mechanism were further explored by XRD, AFM, XPS, FTIR, TEM and SEM tests. The results show that when T = 303 K, pH = 3, and the GO concentration is 100 mg/L in 50 mL of aqueous solution, the removal rate of GO by 40 mg of attapulgite reaches 92.83%, and the partition coefficient K d reaches 16.31. The adsorption kinetics results showed that the adsorption equilibrium was reached at 2160 min, and the adsorption process could be described by the pseudo-second-order adsorption equation, indicating that the adsorption process was accompanied by chemical adsorption and physical adsorption. The isotherm and thermodynamic parameters show that the adsorption of GO by attapulgite is more consistent with the Langmuir isotherm model, and the reaction is a spontaneous endothermic process. The analysis shows that attapulgite is a good material for removing GO, which can provide a reference for the removal of GO in an aqueous environment.

Keywords: graphene oxide; attapulgite; adsorption isotherm; adsorption thermodynamics; adsorption kinetics (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1660-4601/19/5/2793/pdf (application/pdf)
https://www.mdpi.com/1660-4601/19/5/2793/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jijerp:v:19:y:2022:i:5:p:2793-:d:760185

Access Statistics for this article

IJERPH is currently edited by Ms. Jenna Liu

More articles in IJERPH from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().