Potential use of a combine ozone and Uv over zeolite coated with ZnO nanoparticles for gases benzene elimination

Muhammad Ikram A Wahab, Amornpon Changsuphan, Nguyen Thi Kim Oanh, Azhar Abdul Halim

Research output: Contribution to journalArticle

Abstract

Benzene, a known human carcinogen and likely poses significant health effects, is a major air pollutant emitted from anthropogenic activities. This study aims to investigate the performance of ZnO nanoparticles (nZnO) coated on 13X zeolie combination with ozone and UV system to treat benzene contaminated air stream. The adsorbents were characterized by SEM and TEM analyses. The lab scale experiments were conducted at room temperature in different conditions; namely with UV, O3 and UV+O3. The reactor was fed with simulated 5 ppm benzene, 254 nm UV lamp and 7 ppm ozone concentrations. The coated adsorbent at 0.5nZnO:1.0zeolite had the average benzene removal efficiency of 97.9±0.9% compared to 94.2±2.4% by the virgin zeolite. The higher removal was probably due to higher surface area of the coated adsorbent. With UV, O3 and UV+O3 treatments even higher maximum removal efficiencies were achieved, i.e., 98.4±1.9%, 98.2±2.0% and 98.8±0.3%, respectively. Breakthrough curves revealed that with UV, O3 and UV+O3, the service time of the bed was reduced significantly. The photodegradation and oxidation of benzene were confirmed by the presence of CO2 reaction product. Furthermore, formaldehyde, acetaldehyde, ethanol and CO were also found as intermediate products. It was also discovered that all of the used adsorbents can be regenerated for reuse. It is implies that the combination of UV, O3 and UV+O3 could produce combined effects of adsorption, photodegradtion and oxidation Future study suggested that different ratio of ZnO and porous material need to be investigated to have the optimal ratio that provides the optimal removal efficiency.

Original languageEnglish
Pages (from-to)191-200
Number of pages10
JournalAustralian Journal of Basic and Applied Sciences
Volume5
Issue number5
Publication statusPublished - May 2011

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zeolite
benzene
ozone
gas
oxidation
acetaldehyde
breakthrough curve
carcinogen
photodegradation
formaldehyde
transmission electron microscopy
ethanol
human activity
surface area
scanning electron microscopy
nanoparticle
adsorption
removal
air
experiment

Keywords

  • Adsorption
  • Benzene
  • nZnO
  • Photodegradation and oxidation
  • Zeolite

ASJC Scopus subject areas

  • General

Cite this

Potential use of a combine ozone and Uv over zeolite coated with ZnO nanoparticles for gases benzene elimination. / A Wahab, Muhammad Ikram; Changsuphan, Amornpon; Kim Oanh, Nguyen Thi; Abdul Halim, Azhar.

In: Australian Journal of Basic and Applied Sciences, Vol. 5, No. 5, 05.2011, p. 191-200.

Research output: Contribution to journalArticle

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