Caffeine Adsorption onto Bentonite Clay in Suspension and Immobilized

Brazilian Archives of Biology and Technology

关键词: adsorption;    caffeine removal;    immobilized Bentonite;    emerging pollutants;   

DOI  :  10.1590/1678-4324-2020180637

来源: DOAJ

【 摘 要 】

Abstract This study describes the use of bentonite in suspension for the caffeine adsorption (pollutant of emerging concern) by taking different conditions of the pH, adsorbent mass, adsorbent calcination temperature and interferents into account. The results were compared with those obtained using bentonite immobilized in alginate beads. The acid medium has a greater efficiency for the caffeine adsorption and the adsorbent calcination temperature exerts, due to structural changes. Caffeine removal higher than 90% was obtained at optimized conditions. The Langmuir model indicated a better fit of the data and the adsorption capacity of caffeine onto bentonite. The bentonite immobilized led to a slower adsorption process in relation to the suspended.

【 授权许可】

Unknown