Study on the adsorption of Rhodamine B on MoS2/RGO composite

In this study, MoS2/RGO (reduced graphene oxide) composite material was synthesized and tested for adsorption of RhB in water. The adsorption studies were carried out at room temperature and the effects of pH, amount of adsorbents, concentration of adsorbate and time of adsorption on the adsorption were measured. In addition, the dynamics of the adsorption process was also investigated. The results showed that the MoS2/RGO composite displayed toward RhB with maximum adsorption capacity reaching q = 57.79 mg/g at pH = 3.54 and the adsorption process follows the Langmuir adsorption isotherm with the pseudo-second-order model. Findings from this research indicated that the graphene based semiconductor MoS2/RGO composite could be considered a promising adsorbent for removal of organic dyes from waste waters.

Effects of Polypyrrole/Graphene Oxide Composites with Different Reaction Times on Electrochemical Performance

Graphene oxide (GO) was prepared using the modified Hummers method and used as a template for polypyrrole. Polypyrrole was polymerized in situ on the surface of GO to finally obtain the polypyrrole/graphene oxide composite material. The effects of different reaction times on the electrochemical performance of polypyrrole/graphene oxide in the second step were studied. It was obtained that the composite material had optimal properties when the reaction time was 24 h.

Sensitive electrochemical sensor based on poly(l-glutamic acid)/graphene oxide composite material for simultaneous detection of heavy metal ions

A novel electrochemical sensor with high stability and good reproducibility for the simultaneous detection of heavy metal ions was prepared by using PGA/GO to modify the GCE, showing high sensitivity of superior to most of the reported values.