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Removal of gaseous methyl tert‐butyl ether using bagasse activated carbon pretreated with chemical agents

Pongkua, Waleeporn, Dolphen, Rujira, Thiravetyan, Paitip
Journal of chemical technology and biotechnology 2019 v.94 no.5 pp. 1551-1558
adsorbents, adsorption, bagasse, carbon, combustion, gasoline, human health, moieties, nitric acid, potassium hydroxide, sulfuric acid, surface area
BACKGROUND: Methyl tert‐butyl ether (MTBE), an anti‐knocking reagent emitted from incomplete gasoline combustion can affect human health. Bagasse activated carbon (AC) was modified by H₂SO₄, KOH, CaCl₂/HCl and HNO₃ to increase surface area and surface functional groups which led to enhance MTBE adsorption. RESULTS: The results showed maximum adsorption capacity (Qₘₐₓ) of MTBE by bagasse AC modified by H₂SO₄ was the highest (989.33 mg g⁻¹), while the lowest was bagasse AC modified by HNO₃ (463.82 mg g⁻¹). Not much difference was shown to the surface area and micropore volume of the different modified materials. Therefore, the surface functional groups on the different modified materials played an important role in MTBE adsorption. H₂SO₄ modified bagasse AC had a higher maximum adsorption capacity than a commercial AC (CGC12) (560.48 mg g⁻¹), which might be due to the presence of higher ester (CO), carbonyl (CO) and CH stretching groups than commercial AC and other modified bagasse ACs. CONCLUSION: Surface functional groups of adsorbents play an important role in MTBE adsorption. Consequently, it will be possible to enhance MTBE removal by increasing ester (CO), carbonyl (CO) and CH groups on the material's surface. These functional groups are directly involved in MTBE adsorption. © 2019 Society of Chemical Industry