Photocatalytic Study of Bi-ZSM-5 and Bi2O3/HZSM-5 for the Treatment of Phenolic Wastes

• Published in: Catalysis letters Vol. 121; no. 1-2; pp. 131 - 136
• Main Authors: Reddy, Jakkidi Krishna, Lalitha, Kannekanti, Durga Kumari, Valluri, Subrahmanyam, Machiraju
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01-02-2008; Springer; Springer Nature B.V
• Subjects: Absorption spectra; Bismuth oxides; Bismuth trioxide; Blue shift; Catalysis; Catalysts; Catalytic activity; Chemistry; Chemistry and Materials Science; Exact sciences and technology; General and physical chemistry; Impregnation; Industrial Chemistry/Chemical Engineering; Ion-exchange; Organometallic Chemistry; Photocatalysis; Photochemistry; Photodegradation; Physical Chemistry; Physical chemistry of induced reactions (with radiations, particles and ultrasonics); Surface physical chemistry; Systems analysis; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Ultraviolet radiation; X ray photoelectron spectroscopy; Zeolites: preparations and properties; Novel photocatalyst; Phenol degradation; HZSM-5; Bi-ZSM-5; Bi; O; Photocatalysis; Alcohol; Molecular sieve; Degradation; Heterogeneous catalysis; Phenol; Phenols; Benzenic compound; Wastes; Bi2O3/HZSM-5
• ISSN: 1011-372X; 1572-879X
• DOI: 10.1007/s10562-007-9309-0

Bi-ZSM-5 and Bi
2
O
3
/HZSM-5 with varying amounts of (1, 3, and 5 wt.%) of Bi
2
O
3
were prepared by impregnation and solid state dispersion (SSD) methods. These catalysts were characterized by XRD, UV–Vis DRS, XPS, and BET surface area techniques. Characterization of these catalysts by DRS clearly shows a blue shift of >100 nm in the absorption band edge of Bi
2
O
3
(band gap shift from 2.75 to 3.5 eV) in the samples prepared by impregnation and a blue shift of 50 nm in the samples prepared by SSD methods indicating that Bi
2
O
3
is in interaction with the support in impregnated samples. XPS studies are also in favor of this observation. The photocatalytic activities of these systems were evaluated in the degradation of phenol under UV irradiation. Catalysts prepared by impregnation method are showing good photocatalytic activity compared to catalysts prepared by SSD method. Based on the characterization and photodegradation activity of the Bi-ZSM-5 catalysts a structure–activity correlation has been established for the effective treatment of phenolic wastes.