Enhanced removal efficiency of toluene over activated carbon under visible light.

Journal of Hazardous Materials
Shahid SaqlainYoung Dok Kim

Abstract

Toluene removal rates using activated carbon (AC) at various relative humidity (RH) levels (0%, 30%, 60%) were compared under dark and visible-light conditions. Light exposure significantly increased toluene-removal efficiency independent of RH. When AC was pre-treated with an optimal concentration of HNO3, its toluene-removal efficiency was enhanced further with light, an effect that can be attributed to increased surface-area and porosity. Fourier-transform infrared analysis confirmed that exposure of HNO3-modified AC to light induced partial oxidation of toluene. Within visible-light range (380-650 nm), shorter wavelengths were more effective for toluene-removal compared with longer wavelengths. This suggests that hydroxyl groups formed on AC-surface under light strongly interact with aromatic rings of toluene, allowing for greater uptake of toluene. Moreover, AC can sustain its photo-activity when mixed with cement and cured, suggesting its potential applications in air-purifying building materials. An efficient and practical method for regeneration of spent AC is also demonstrated.

References

Dec 15, 2006·Journal of the American Chemical Society·Wakana Kubo, Tetsu Tatsuma
Mar 31, 2016·Environmental Science and Pollution Research International·Tânia M FujimotoEdson Tomaz
Nov 13, 2017·Journal of Hazardous Materials·Ji Min KimHo Seon Ahn
Aug 20, 2019·Advanced Materials·Qing GuoXueming Yang

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