Ayatollah Amoli IAU Faculty Member Develops Approach For Industrial Wastewater Treatment

Monday, March 12, 2018 - 15:03

A faculty member from Ayatollah Amoli Islamic Azad University has investigated the development of a graphene oxide/chitosan nanocomposite for the removal of picric acid from aqueous solutions: Study of sorption parameters.

According to an ISCA report, Hasan Tahermansouri stated that Phenol and its derivatives are one of the most pervasive combinations that can enter the water both naturally and artificially. Due to its relative stability in the environment and its ability to dissolve in water, it causes significant health problems.

Based on the research, the functionalization of graphene oxide (GO) with chitosan (Chi) has been investigated to prepare a nanocomposite material (GO-Chi) for the removal of picric acid from aqueous solutions. Materials were characterized by FT-IR, TGA, DTG, FESEM, EDX, XRD and BET.

Batch experiments such as solution pH, amount of adsorbents, contact time, concentration of the picric acid and temperature were achieved to study sorption process. Kinetic studies were well described by pseudo-second-order kinetic model for both adsorbents.

Isotherm studies showed that the Langmuir isotherm for GO and Freundlich and Halsey models for GO-Chi were found to best represent the measured sorption data. Negative ΔG° values for GO-Chi and positive ones for GO indicated the nature of spontaneous and unspontaneous, respectively for adsorption process. In addition, picric acid molecules can be desorbed from GO-Chi up to 80% at pH = 9 and that the consumed GO-Chi could be reutilized up to 5th cycle of regeneration.

The result of the study has been published on: Colloids and Surfaces B: Biointerfaces, 160 (2017) 671–681, International Journal of Biological Macromolecules, 109 (2018) 598–610, Carbon Letters, 22 (2017) 14-24.

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