Surface Modification of Graphene Nanoplatelets by Organic Acids and Ultrasonic Radiation for Enhance Uremic Toxins Adsorption


Aide Saenz Galindo

Abstract: Ultrasound energy is a green and economically viable alternative to conventional techniques
for surface modification of materials. The main benefits of this technique are the decrease of processing
time and the amount of energy used. In this work, graphene nanoplatelets were treated with organic
acids under ultrasonic radiation of 350Wat different times (30 and 60 min) aiming to modify their
surface with functional acid groups and to improve the adsorption of uremic toxins. The modified
graphene nanoplatelets were characterized by Fourier transform infrared spectroscopy (FT–IR),
thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS). The optimum time
for modification with organic acids was 30 min. The modified nanoplatelets were tested as adsorbent
material for uremic toxins using the equilibrium isotherms where the adsorption isotherm of urea
was adjusted for the Langmuir model. From the solution, 75% of uremic toxins were removed and
absorbed by the modified nanoplatelets.

Artículo-ASG 2 2019