Regeneration of Rhodamine B Loaded Modified Biosorbent by a Self-Cleaning Eluent: TiO2 Hydrosol

✍ Scribed by Jun-Xia Yu; Zheng-Yan He; Ya-Feng Qi; Ru-An Chi; Jia Guo; Guang Zhan

• Book ID: 102097724
• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 401 KB
• Volume: 39
• Category: Article
• ISSN: 1863-0650
• DOI: 10.1002/clen.201000045

✦ Synopsis

Waste beer yeast was modified by pyromellitic dianhydride to improve its adsorption capacity for rhodamine B (RhB). Results showed that the adsorption capacity of the modified biomass for RhB was 600 mg g À1 , which was about five times than that obtained on the unmodified biomass. Dye loaded modified biomass was regenerated by (1) a common eluent: HNO 3 solution and (2) a self-cleaning eluent: TiO 2 hydrosol, while the pH of both systems varied from 1 to 4. Desorption experimental results showed that low desorption rates were obtained in both systems after the first desorption cycle. A large volume of HNO 3 solution was needed to obtain high desorption rate, and a concentrated solution of RhB was left, which brought a secondary pollution. As a self-cleaning eluent, acid TiO 2 hydrosol acted both as eluent and photocatalyst. The desorbed RhB could be photodegraded under sunlight irradiation and the same hydrosol could be used in the next desorption cycle without losing its activity, which could economize large volumes of solvent. The results showed an adsorption capacity of the regenerated biosorbent for RhB of 450 mg g À1 by using hydrosol with pH 2 as eluent after four desorption/photodegradation cycles.