Degradation of methylene blue adsorbed onto transparent adsorbent by UV-illumination (simple regeneration method)

作者：Baraka Ahmad^*

来源：Desalination and Water Treatment, 2012, 49(1-3): 172-180.

DOI：10.1080/19443994.2012.708228

• Transparent adsorbent
• Regeneration
• Degradation
• Dye
• UV-illumination

This work presents in-pores degradation of a dye that was subjected to adsorption into a transparent adsorbent. The degradation was performed by UV-illumination of the dye-loaded adsorbent. This degradation by UV-illumination is considered as a regeneration technique for the adsorbent. For this specific aim, a new transparent adsorbent was prepared. It is a hybrid resin-gel composed of melamine formaldehyde tartaric acid/acrylamide tartaric acid (MFT/AT). methylene blue (MB) was selected as a typical contaminant dye due to its known degradability by UV rays. A sample of MFT/AT was used through 10-cycles of MB-adsorption/UV-illumination applying batch method. For each cycle, MB was apparently completely degraded. Rate of MB-adsorption by MFT/AT was investigated applying pseudo second order model for the 1st and 10th cycles. It was found that adsorption rate and capacity were not significantly changed (rate constants = 0.186, 0.199 g mg(-1) min(-1) and capacities = 0.264, 0.258mg g(-1) respectively). A fresh and the 10th-cycle-used samples of MFT/AT were characterized through Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis, Brunauer, Emmett and Teller method (BET) and scanning electron microscope to discover the side effect of UV-illumination on chemical, physical, morphological and aerial properties of adsorbent. It was found that MFT/AT was chemically and physically changed but its morphological and aerial properties did not change significantly.

• 出版日期2012-11