Desorption Studies for Methylene Blue Dye Removal by Kaolinite

  • Puteri Balqis Awatif Abdul Ghani Faculty of Applied Sciences, Universiti Teknologi MARA, Negeri Sembilan branch, Kuala Pilah campus, 72000 Kuala Pilah, Negeri Sembilan, Malaysia
  • Ruhaida Rusmin Faculty of Applied Sciences, Universiti Teknologi MARA, Negeri Sembilan branch, Kuala Pilah campus, 72000 Kuala Pilah, Negeri Sembilan, Malaysia
  • Izzan Salwana Izman Faculty of Applied Sciences, Universiti Teknologi MARA, Negeri Sembilan branch, Kuala Pilah campus, 72000 Kuala Pilah, Negeri Sembilan, Malaysia

Abstract

In wastewater treatment, the reusability of an adsorbent strongly relies on the feasibility of contaminant desorption from the spent adsorbent. This research aims to investigate the Methylene Blue (MB) release from the spent kaolinite clay mineral against a variety of desorbing eluent in aqueous solution. The clay minerals were first characterized using SEM, surface area analysis, XRD and FTIR spectroscopy. The MB desorption was performed using eluents of distilled water, 0.01 M and 0.1 M of HCl, NaOH, and NaCl, respectively, as well as ethanol : water mixture (30:70, 50:50 and 70:30 v/v ratios). It was found that the MB desorption only occurs in 0.1 M NaOH (pH 12.7). A 4.17% MB desorption was recorded in 1 hour and was increased to 19.5% within 24 hours desorption time. pH change measurement also reveals the favorability for highly alkaline condition for MB desorption. Overall finding indicates that the MB retention towards kaolinite is strong and their interaction was beyond the electrostatic interaction. Pore diffusion factor is likely contributed to the difficulty of MB to be desorbed from the spent kaolinite. Hence, kaolinite is a good scavenger for removing MB dye from contaminated water but may require more harsh desorption condition to allow for the reusability purposes.

Published
2021-08-27
How to Cite
ABDUL GHANI, Puteri Balqis Awatif; RUSMIN, Ruhaida; IZMAN, Izzan Salwana. Desorption Studies for Methylene Blue Dye Removal by Kaolinite. Scientific Research Journal, [S.l.], v. 18, n. 2, p. 215-227, aug. 2021. ISSN 2289-649X. Available at: <https://myjms.mohe.gov.my/index.php/SRJ/article/view/14127>. Date accessed: 21 may 2022. doi: https://doi.org/10.24191/srj.v18i2.14127.