Optimization Study for the Desorption of Methylene Blue Dye from Clay Based Adsorbent Coating
School of Chemical Engineering, Universiti Sains Malaysia, Engineering Campus, Nibong Tebal 14300, Penang, Malaysia
School of Industrial Technology, Universiti Sains Malaysia, Main Campus, Gelugor 11800, Penang, Malaysia
Department of Industrial Chemistry, Aligarh Muslim University, Aligarh 202001, UP, India
Authors to whom correspondence should be addressed.
Water 2019, 11(6), 1304; https://doi.org/10.3390/w11061304
Received: 2 May 2019 / Revised: 8 June 2019 / Accepted: 10 June 2019 / Published: 24 June 2019
(This article belongs to the Special Issue Water Pollution Control Using Clay Minerals and Agricultural Biomass-Based Adsorbents)
Batch desorption experiments of methylene blue (MB) dye from a clay adsorbent coating were carried out to evaluate the maximum desorption conditions. Combination of thermal and chemical regeneration techniques were used for the desorption process. The desorption of MB was found to be 70% using an HCl solvent after heating adsorbent coating at 160 °C. The optimization study was carried out to identity the optimum desorption conditions using MINITAB 14 software. The individual and interaction effects of three factors, temperature, dye concentration and contact time for desorption of dye were determine by applying response surface methodology (RSM). The optimization results showed that all three factors have main effects whereas the interaction of concentration–time is significant as compared to other interactions. The findings exhibit a maximum desorption efficiency 23 mg/g at 60 °C for 100 mg/L of dye and 150 min of contact time.