Adsorption characteristics of clay adsorbents - sepiolite, kaolin and synthetic talc - for removal of Reactive Yellow 138:1

作者：Rahman Ari^*; Kishimoto Naoyuki; Urabe Takeo

来源：Water and Environment Journal, 2015, 29(3): 375-382.

DOI：10.1111/wej.12131

• adsorption capacity
• anion exchange capacity
• Langmuir isotherm
• Reactive Yellow 138:1
• specific surface area
• synthetic talc

Adsorption characteristics of three clay adsorbents - sepiolite, kaolin and synthetic talc - were investigated to determine their applicability to remove an anionic reactive dye - Reactive Yellow 138:1 - from a water stream. Results showed that synthetic talc had the highest maximum monolayer adsorption capacity of 10.07 mg/g, followed by kaolin (3.73 mg/g) and sepiolite (3.23 mg/g), for the removal of Reactive Yellow 138:1. Synthetic talc and sepiolite removed dyes from aqueous solutions mainly through physical adsorption depending on the surface area. By contrast, the adsorption mechanism of kaolin was strongly influenced by the anion exchange mechanism. Zeta potential analysis revealed that the adsorption capacity of clay adsorbents increased under acidic rather than alkaline conditions, owing to protonation of the clay surface. Moreover, synthetic talc was successfully regenerated by heating at more than 400 degrees C, effectively restoring its original adsorption capacity.

• 出版日期2015-9