Impact of Titanium Dioxide Particles on Adsorption Properties of HZSM-5 Zeolite for Toluene Treatment

Document Type : Original Article


1 Department of Occupational Health, School of Medical Science, Tarbiat Modares University, Tehran,

2 Department of Occupational Health, School of Public Health, Hamadan University of Medical Sciences, Hamadan,

3 Department of Occupational Health, School of Health, Ghazvin University of Medical Science, Ghazvin,

4 Department of Occupational Health, School of Health, Gillan University of Medical Science, Rasht, Iran



Today, a variety of catalysts were used for the removal of the volatile organic compound in work environments. Zeolites are frequently used as catalyst and catalyst base because of their desirable characteristics. HZSM-5 attracts the attention of air pollution researchers in recent years. The aim of this study is to investigate the adsorption properties of HZSM-5/titanium dioxide (TiO2) catalyst.
Materials and Methods: 
A dynamic system was used for producing 42 ppm of toluene in 250C, 5% humidity, and environment pressure. For determination of adsorption capacity, 42 ppm of toluene with the flow of 0.5 L/min passed through the reactor containing 1 g of the HZSM-5/TiO2catalyst which was coated within 3%, 5%, and 8% of TiO2using impregnation method. For determination of the catalyst characteristics, different analyses of X-ray diffraction, Brunauer Emmett Teller (BET), Fourier transform infrared, and scanning electron microscope were used.
Adsorption capacity was 22.3, 23.81, 38.06, and 28.88 mg/g for HZSM-5HZSM-5/Tio23%, HZSM-5/Tio25% and HZSM-5/Tio28%, respectively. The specific surface was 298.8 m2/g for HZSM-5 and 212.8, 189.3, and 185.1 m2/g for 3%, 5%, and 8% HZSM-5/TiO2catalyst, respectively. Results indicated that the breakthrough time increases by increasing in weight percent of TiO2. Adsorption isotherm was identified as type I, based on International Union of Pure and Applied Chemistry (IUPAC) classification.
The integration of TiO2particles with HZSM-5 created a photocatalyst with desirable properties that include high adsorption capacity and long breakthrough time to maintain a high amount of toluene vapors, which lead to better removal efficiency.