Zwitterion-decorated graphene oxide nanosheets with aliphatic amino acids under specific pH conditions

被引：22

作者：

Espinoza, R. Castellanos ^{[1
]}

Sierra-Gomez, U. ^{[2
]}

Magdaleno Lopez, C. ^{[1
]}

Gonzalez-Gutierrez, L., V ^{[1
]}

Estela Castillo, B. ^{[3
]}

Luna Barcenas, G. ^{[3
]}

Elizalde Pena, E. A. ^{[4
]}

Perez Bueno, J. J. ^{[1
]}

Fernandez Tavizon, S. ^{[2
]}

Espana Sanchez, B. L. ^{[1
]}

机构：

[1] Ctr Invest & Desarrollo Tecnol Electroquim CIDETE, Parque Tecnol S-N Sanfandila, Pedro Escobedo 76703, Queretaro, Mexico

[2] Ctr Invest Quim Aplicada, Lab Nacl Mat Grafen, CIQA, Blvd Enrique Reyna Hermosillo,Apdo 140, Saltillo 25294, Coahuila, Mexico

[3] CINVESTAV IPN Unidad Queretaro, Libramiento Norponiente 2000, Fracc Real De Juriquilla 76230, Queretaro, Mexico

[4] Univ Autonoma Queretaro, Direcc Invest & Posgrad, Fac Ingn, Santiago De Queretaro 76140, Mexico

来源：

APPLIED SURFACE SCIENCE | 2021年 / 555卷

关键词：

Graphene oxide; Zwitterionic; Aliphatic amino acids; Zeta potential; Specific pH conditions; FUNCTIONAL-GROUPS; GRAPHITE OXIDE; RAMAN-SPECTROSCOPY; CHEMICAL-REDUCTION; HUMMERS METHOD; REMOVAL; ADSORBENT; MEMBRANES; DISPERSIBILITY; TEMPERATURE;

D O I：

10.1016/j.apsusc.2021.149723

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The chemical functionalization of graphene oxide nanosheets (GO) with aliphatic amino acids such as arginine and lysine (Arg and Lys), was studied to determine the zwitterionic behavior of nanomaterials under specific pH conditions (Arg at pH 8 and Lys at pH 9.8). For this purpose, the primary amine of each amino acid was previously activated, aiming to promote the formation of C-N bonds between the amino acid and the epoxide groups at the surface of GO nanosheets. Results showed significant changes in the crystalline structure and morphology of GO with this amino acid incorporation, associated with C-N bond formation and, corroborated by FTIR and XPS measurements. Consequently, Zeta potential of the functionalized graphene oxide nanosheets presented an isoelectric point ca. 2.14 for GO-Arg and 2.41 for GO-Lys, suggesting a zwitterionic behavior in aqueous solutions. Zwitterionic behavior of GO nanosheets decorated with aliphatic amino acids may act as a selective nanomaterial for organic dye removal.

引用

页数：10

共 81 条

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