Recycling the wasted bentonite clay as a new and low-cost adsorbent for the ‎removal of the methylene blue (MB) dye from the aqueous solution

Document Type : Research Paper


Environmental Engineering Department of Civil and Environmental Engineering Babol Noshirvani University of Technology Babol, Islamic Republic of Iran


This study aims to recycle thermal remediated bentonite clay waste (TRBCW) as a green, ‎new, low-cost adsorbent to remove the methylene blue (MB) dye in an aqueous solution. The ‎first system was the batch adsorption experiments having five condition parameters: contact ‎time, pH, temperature, initial concentration of MB, and dose of TRBCW adsorbent. From the ‎analysis of the batch adsorption data, it was apparent that the adsorbing of MB molecules on ‎the TRBCW adsorbent was endothermic, irreversible, promising, spontaneous, and favorable. ‎The Fruendlich model was more compatible than the Langmuir model for the experimental ‎batch adsorption data, and the maximum adsorption capacity was 34.77 mg/g. The second ‎system is the continuous (fixed-bed column) having three investigated condition parameters: ‎the influent MB concentration, flow rate, and (TRBCW weight) bed depth, the adsorption ‎capacity that results from the dominant parameters (1ml/min, 50 mg/L, and 22 cm) was 61.37 ‎mg/g, and the experimental continuous adsorption data were more suitable with Yoon-Nelson, ‎Thomas, and BDST models with R2 > 0.9.‎


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Articles in Press, Accepted Manuscript
Available Online from 17 February 2024
  • Receive Date: 17 July 2023
  • Revise Date: 17 February 2024
  • Accept Date: 17 February 2024