title: Adsorptive removal and photocatalytic decomposition of sulfamethazine in secondary effluent using TiO2-zeolite composites.
abstract: We investigated the adsorption and decomposition of sulfamethazine (SMT), which is used as a synthetic antibacterial agent and discharged into environmental water, using high-silica Y-type zeolite (HSZ-385), titanium dioxide (TiO2), and TiO2-zeolite composites. By using ultrapure water and secondary effluent as solvents, we prepared SMT solutions (10 μg/L and 10 mg/L) and used them for adsorption and photocatalytic decomposition experiments. When HSZ-385 was used as an adsorbent, rapid adsorption of SMT in the secondary effluent was confirmed, and the adsorption reached equilibrium within 10 min. The photocatalytic decomposition rate using TiO2 in the secondary effluent was lower than that in ultrapure water, and we clarified the inhibitory effect of ions and organic matter contained in the secondary effluent on the reaction. We synthesized TiO2-zeolite composites and applied them to the removal of SMT. During the treatment of 10 μg/L SMT in the secondary effluent using the composites, 76% and more than 99% of the SMT were decomposed within 2 and 4 h by photocatalysis. The SMT was selectively adsorbed onto high-silica Y-type zeolite in the composites. Resultantly, the inhibitory effect of the coexisting materials was reduced, and the composites could remove SMT more effectively compared with TiO2 alone in the secondary effluent.
authors: Graduate School of Integrated Arts and Sciences, Kochi University, 200 Monobe Otsu, Nankoku, Kochi, 783-8502, Japan.
authors: Misaki
authors: M
authors: Ito
authors: Shuji
authors: S
authors: Fukahori
authors: Taku
authors: T
authors: Fujiwara
mesh_terms: D000327:Adsorption; D000900:Anti-Bacterial Agents / Q000032:analysis / Q000737:chemistry; D002384:Catalysis; D012822:Silicon Dioxide; D013418:Sulfamethazine / Q000032:analysis / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014867:Water; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*; D017641:Zeolites / Q000737:chemistry*
chemical_list: D000900:Anti-Bacterial Agents; D014874:Water Pollutants, Chemical; D014867:Water; D017641:Zeolites; C009495:titanium dioxide; D013418:Sulfamethazine; D012822:Silicon Dioxide; D014025:Titanium
references: Water Res. 2012 Jun 1;46(9):3054-64
references: 22464146
references: Water Res. 2006 Apr;40(7):1481-91
references: 16563461
references: Chemosphere. 2011 Jan;82(2):179-86
references: 21040946
references: Water Res. 2003 Apr;37(8):1976-82
references: 12697241
references: J Hazard Mater. 2009 Sep 15;168(2-3):602-8
references: 19327889
references: J Hazard Mater. 2012 Apr 15;211-212:131-7
references: 21943922
references: Toxicol Lett. 2002 May 10;131(1-2):5-17
references: 11988354
references: Chemosphere. 2013 Jan;90(4):1514-9
references: 22959719
references: Talanta. 2006 Apr 15;69(2):334-42
references: 18970571
references: Sci Total Environ. 2012 Apr 1;421-422:173-83
references: 22369865
references: Aquat Toxicol. 2006 Feb 10;76(2):122-59
references: 16257063
references: J Hazard Mater. 2009 Jul 30;166(2-3):1134-40
references: 19147286
references: Water Res. 2006 Jan;40(2):241-8
references: 16376964
references: Water Sci Technol. 2013;67(2):319-25
references: 23168630
references: Water Res. 2007 Jun;41(12):2612-26
references: 17433403