Toluene adsorption from waste air stream using activated carbon impregnated with manganese and magnesium metal oxides

F Rezaei; G Moussavi; A.R Riyahi Bakhtiari; Y Yamini

سلامت و محیط (Mar 2016)

Toluene adsorption from waste air stream using activated carbon impregnated with manganese and magnesium metal oxides

F Rezaei,
G Moussavi,
A.R Riyahi Bakhtiari,
Y Yamini

Affiliations

F Rezaei: Ph.D. of Environmental Pollution, Department of Environmental Pollution, Faculty of Natural Resources, Tarbiat Modares University, Tehran, Iran
G Moussavi: Full professor of Environmental Health Engineering, Department of Environmental Health, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
A.R Riyahi Bakhtiari: Associate professor of Natural Resources Sciences, Department of Environmental Pollution, Faculty of Natural Resources, Tarbiat Modares University, Tehran, Iran
Y Yamini: Full professor of Analytical Chemistry, Department of Analytical Chemistry, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, Iran

Journal volume & issue: Vol. 8, no. 4
pp. 491 – 508

Abstract

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Background and Objectives: Adsorption is one of the most common methods for VOCs elimination from waste air stream. The study on the application of a selective and cheap adsorbent with high efficiency in VOCs removal is important from economic aspects. In this study, the potential of MnO/GAC and MgO/GAC composites was investigated for toluene adsorption from air stream at lab scale. Material and methods: The MnO/GAC and MgO/GAC adsorbents were prepared through Sol-gel method and then were characterized using BET, XRF, and SEM analysis. The effect of operational parameters including; retention time (0.5, 1, 1.5, 2, and 4 S), inlet toluene concentration (100, 200, 300, and 400 ppmv) and the temperature of the air stream (25, 50, 75, and 100 ˚C) were examined on the efficiency of both adsorbents. The efficiency of MnO/GAC and MgO/GAC were determined from the breakthrough time and adsorption capacity and the results were compared statistically. Results: The breakthrough time of MnO/GAC and MgO/GAC adsorbents increased 90% by increasing retention time from 0.5 to 4 S. Adsorption capacity of MgO/GAC and MnO/GAC was increased 39and 61.1% by increasing inlet toluene concentration from 100 to 400 ppmv, respectively. Breakthrough time of MgO/GAC and MnO/GAC decreased 65 and 59% by increasing inlet toluene concentration from 100 to 400 ppmv, respectively. The efficiency of MgO/GAC and MnO/GAC adsorbents had a direct relationship with the increase of air temperature from 25 to 100 ˚C. Accordingly, the efficiency of MgO/GAC and MnO/GAC was increased 78 and 32% by increasing air temperature, respectively. Conclusion: The results of the study showed that MgO/GAC and MnO/GAC adsorbents had high efficiency in toluene removal from air stream. The difference between the efficiency of MgO/GAC and MnO/GAC adsorbents was significant and MgO/GAC adsorbent showed higher efficiency than MnO/GAC for toluene adsorption from waste air.

Published in سلامت و محیط

ISSN: 2008-2029 (Print); 2008-3718 (Online)
Publisher: Tehran University of Medical Sciences
Country of publisher: Iran, Islamic Republic of
LCC subjects: Geography. Anthropology. Recreation: Environmental sciences
Website: https://ijhe.tums.ac.ir/en

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