首页|Caffeine removal by chitosan/activated carbon composite beads: Adsorption in tap water and synthetic hospital wastewater
Caffeine removal by chitosan/activated carbon composite beads: Adsorption in tap water and synthetic hospital wastewater
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NSTL
Caffeine in water resources has been reported, indicating the need for alternative treatments. Activated carbons (ACs) are efficient adsorbents; however, they present issues that immobilization in chitosan hydrogel (CH) can overcome. Despite the importance of both aspects, adsorption in continuous systems and different aqueous matrices are understudied. The present study developed and characterized chitosan/AC composites to improve the adsorbent properties and fill the research gap presented. The adsorbent was applied to adsorb caffeine in batch and fixed-bed experiments, using distilled and tap water and synthetic hospital wastewater. Chicha-do-cerrado shells were used to develop two different ACs (KAC and CAC) and composite beads (CH-KAC and CH-CAC). KAC and CH-KAC showed high surface area (1082 and 240 m2 g~(-1)), and FTIR indicated that CH assigned new functional groups to the composites. Batch studies revealed a maximum adsorption capacity of 391.00, 139.61, 121.90, and 39.53 mg g~(-1) for KAC, CAC, CH-KAC, and CH-CAC, respectively. The ions effect in tap water did not occur for the composites due to the bridging phenomenon. In treating the synthetic hospital wastewater, the addition of AC increased the removal efficiency. The fixed-bed maximum adsorption capacity was 83.88 mg g~(-1) for CH-KAC, and the column was reused three times. The importance of both CH and ACs has been successfully proven.
NSTL
