Application of CNT-COOH/MnO₂/Fe₃O₄ Nanocomposite for the Removal of Cymoxanil from Aqueous Solution: Isotherm and Kinetic Studies

Abstract

The present study reports the cymoxanil adsorption efficiency on carboxy-carbon nanotubes (CNT-COOH)/manganese(IV) oxide (MnO₂)/iron(II,III) oxide(Fe₃O₄) nanocomposite. The optimum conditions were determined by studying the influence of pH (2-10), temperature (20-60 °C), initial cymoxanil concentration (7-20 mg L⁻¹), adsorbent dose (0.5-5 g L⁻¹) and contact time (2-30 min) on the adsorption process. The isotherm and kinetic models were used to analyze the experimental data. The Langmuir isotherm model was shown to provide the best fit with a 10.672 mg g⁻¹ maximum adsorption capacity. Also, the cymoxanil adsorption follows the pseudo-second order kinetic model. According to these results, the CNT-COOH/MnO₂/Fe₃O₄ nanocomposite may be used for cymoxanil removal from aqueous solution.

Keywords:

• Adsorption
• carbon nanotubes
• carboxy-carbon nanotubes
• cymoxanil
• nanocomposite

Conflicts of interest

The authors declare no conflicts of interest.

Additional information

Funding

Financial support from the Romanian Ministry of Research and Innovation, Core Programme, Project PN 19 35 02 03 (36N/13.02.2019) is gratefully acknowledged.