Adsorption kinetics and isotherms study of 2,4-dichlorophenoxyacetic acid by 3dimensional/graphene oxide/magnetic from aquatic solutions

ABSTRACT

3D polymer nanomagnetic (3D/GO/Fe₃O₄) adsorbent was fabricated and used for determining removal of 2,4-D from an aqueous solution. The adsorbent was characterised by FTIR, XRD, FE-SEM, TEM, VSM, and TGA. The influence of pH, contact time, 2,4-D initial concentration, temperature and adsorbent dosage in adsorption efficiency was examined. Maximum removal (100%) was observed at the optimum adsorption condition (pH: 3, contact time: 180 min, adsorbent dosage: 5 g/L, and temperature: 50°C). Moreover, the equilibrium adsorption data were fitted to Langmuir (R² = 0.995) and pseudo-second-order model (R² = 0.991). The model parameters were evaluated and maximum adsorption capacity (q_max = 5.62 mg/g) was reported. In addition, applying adsorbent to remove 2,4-D from the real samples of agricultural wastewater shows successfully 100% removal efficiency. Therefore, according to removal efficiency (100%), this adsorbent is an excellent alternative for removal herbicide in high temperature industry.

KEYWORDS:

• 2-dichlorophenoxyacetic acid
• polymer nanomagnetic adsorbent
• thermosensitive adsorbent
• adsorption

Acknowledgments

The authors are grateful for the financial support of this project by the Research Council of Islamic Azad University, Tehran, Iran.

Disclosure statement

No potential conflict of interest was reported by the author(s).