Graphene and graphene oxide as effective adsorbents toward anionic and cationic dyes

来自 dx.doi.org

喜欢 0

阅读量：

465

作者：

GK Ramesha，AV Kumara，HB Muralidhara，S Sampath

展开

摘要：

In the present study, exfoliated graphene oxide (EGO) and reduced graphene oxide (rGO) have been used for the adsorption of various charged dyes such as methylene blue, methyl violet, rhodamine B, and orange G from aqueous solutions. EGO consists of single layer of graphite decorated with oxygen containing functional groups such as carboxyl, epoxy, ketone, and hydroxyl groups in its basal and edge planes. Consequently, the large negative charge density available in aqueous solutions helps in the effective adsorption of cationic dyes on EGO while the adsorption is negligible for anionic dyes. On the other hand, rGO that has high surface area does not possess as high a negative charge and is found to be very good adsorbent for anionic dyes. The adsorption process is followed using UV–Visible spectroscopy, while the material before and after adsorption has been characterized using physicochemical and spectroscopic techniques. Various isotherms have been used to fit the data, and kinetic parameters were evaluated. Raman and FT-IR spectroscopic data yield information on the interactions of dyes with the adsorbent.

展开

关键词：

Graphene oxide Reduced graphene oxide Dyes Vibrational spectroscopy Adsorption isotherm

DOI：

10.1016/j.jcis.2011.05.050

被引量：

597

年份：

2011