ADSORPTION STUDIES ON THE REMOVAL OF NAPHTOL-AS DYE USING IRON FILINGS AS ADSORBENT

Authors

  • C. M. Ngwu
  • O. K. Amadi
  • M. O. Mac-Kalunta
  • J. Onyeuwaoma

DOI:

https://doi.org/10.46602/jcsn.v46i2.604

Abstract

This study investigated the potential of iron filings as low cost and environmentally friendly adsorbent for removing Naphthol AS dye from aqueous solutions. The batch-adsorption experiments were performed as a function of pH, temperature, concentration, contact time as well as dynamics of the process. The Langmuir, Freundlich and Dubinin-Raduskevich isotherm models for the adsorption processes were tested but Freundlich isotherm provided the best description for adsorption of the dye solution onto the iron filings, suggesting a physisorption controlled adsorption. The adsorption process was highly pH-dependent and the result indicates that the optimum pH for adsorption of Naphthol AS onto the adsorbent occurred at 4.0 having a maximum removal efficiency of 88 % respectively. Pseudo first-order and second-order as well as the intra-particle diffusivity kinetic models were applied to the experimental data and results showed that the pseudo second-order provided best fit for the experimental data. Kinetic studies also showed that the adsorption transport mechanism was particle-diffusion controlled.

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Published

2021-03-30

How to Cite

Ngwu, C. M. ., Amadi, O. K. ., Mac-Kalunta, M. O. ., & Onyeuwaoma, J. . (2021). ADSORPTION STUDIES ON THE REMOVAL OF NAPHTOL-AS DYE USING IRON FILINGS AS ADSORBENT . Journal of Chemical Society of Nigeria, 46(2). https://doi.org/10.46602/jcsn.v46i2.604