Styrene monomer is a volatile organic compound that has many applications in plastics, rubber, and paint manufacturing industries. Exposure to styrene vapor has certain effects, including suppression of the central nervous system, loss of concentration, weakness and fatigue, and nausea and there is a possibility of carcinogenesis in long-term exposure. Therefore, it is necessary to control and eliminate this vapor. The aim of this study was to investigate the performance of zinc oxide nanoparticles on modified natural zeolites in removing styrene vapor from the air. Natural zeolites of clinoptilolite were modified using hydrochloric acid and diphenyldichlorosilane. Next, zinc oxide nanoparticles with different ratios of 3, 5, and 10 wt% were stabilized on the zeolites. To determine their characteristics, samples were used from BET, SEM and XRD analyses. The input styrene concentration and the ratio of nanoparticles stabilized on zeolites were studied as effective functional parameters on the removal process. The efficiency results of natural zeolites (Ze) and modified zeolites (Mze) in styrene adsorption from the air show that the styrene breakthrough in the bed of MZe compared to that of Ze increases approximately two times. Also, the results showed that the removal by the process of UV/MZe-ZnO 3%, UV/MZe-ZnO 5%, and UV/MZe-ZnO 10%, was 36.5%, 40%, and 26%, respectively. From the results it can be concluded that MZe can increase the efficiency of photocatalytic degradation. Clinoptilolites of Iran can be used as an adsorbent to remove polluted air in industries that have low concentrations and flow rates.
R.-D. Sun, A. Nakajima, I. Watanabe, T. Watanabe and K. Hashimoto, J. Photochem. Photobio. A: Chem., 136, 111 (2000).CrossRefGoogle Scholar
U.S.E.P.A. (USEPA). Sources of indoor air pollution-organic gases (volatile organic compounds, VOCs). http://www.epa.gov/iaq/voc.html.Google Scholar
A. Tossavainen, The Scandinavian Journal of Work, Environment & Health, 4 (1978).Google Scholar
EPA. Drinking Water Standards Technical Factsheet on: Styrene. Water, 1 (1993).Google Scholar
M. Lim, Y. Zhou, B. Wood, Y. Guo, L. Wang, V. Rudolph and G. Lu, J. Phys. Chem. C., 112, 19655 (2008).CrossRefGoogle Scholar
TOXICOLOGICAL PROFILE FOR STYRENE, Life Systems, Inc. Under Subcontract to:Clement International Corporation Under Contract No. 205 88-0608. Agency for Toxic Substances and Disease Registry U.S. Public Health Service (1992).Google Scholar
Threshold Limit Value For Chemical Substances And Physical Agents And Biological Exposure Indices, American Conferences Of Government Industrial Hygienists (ACGIH) (2012).Google Scholar