Adsorption of acetaldehyde from air by activated carbon and carbon fibers

Abstract

The adsorption of acetaldehyde from air using various activated carbon and carbon fibers was investigated in this study. These adsorbents included activated carbon (AC), carbon fibers (CFs), activated carbon fibers (ACFs), and metal-coated carbon fibers (MCCFs) supplied by different manufacturers. AC was categorized as AC 1 , AC 2 , AC 3 , and AC 4 , CFs were denoted as ACF 1 , while ACFs and MCCFs were denoted as ACF 2 and ACF 3 , respectively. Five composite materials were prepared using the AC and ACFs in different ratios, and experiments were conducted to assess their acetaldehyde adsorption efficiency under dry and wet conditions. The results showed that the acetaldehyde adsorption efficiency of an impregnated AC 4 was higher (95.9%) than that of both non-impregnated AC 1 and AC 3 and an impregnated AC 2 after 1 min of operation. ACF 2 showed a higher acetaldehyde adsorption efficiency (50.9%) as compared to ACF 1 and ACF 3 because of its larger surface area and selective absorption capability after 1 min of operation. A composite material consisting of 6.3 g of AC 4 and 1 g of ACF 2 showed the highest adsorption efficiency of 97.9% under dry conditions. However, this adsorption efficiency significantly decreased under wet conditions.

Acetaldehyde Adsorption Characteristics of Ag/ACF Composite Prepared by Liquid Phase Plasma Method

“…4 V Meso : Mesopore volume; V Tota l − V Meso . 5 Mesorpore ratio: (V meso /V Total ) × 100. 6 Pore diameter: BJH method.…”

“…, where m is the adsorbent mass (g) and t is the operating time. 5 Removal percentages of breakthrough: % = 100. 6 Removal percentages of exhaustion: % = 100.…”

“…Among them, acetaldehyde (AA) is one of 35 specific air-hazardous substances in Korea and has a reference concentration for trace emission of 0.01 ppm because it is harmful to the human body [3,4]. Acetaldehyde can cause respiratory paralysis, convulsion, and corneal injury [5].…”

“…Carbon materials such as activated carbon (AC) have many advantages, such as high surface area, thermal stability, inexpensiveness, and renewability, and are therefore used as major adsorbents [5,7]. In addition, various metals have been supported on carbon materials and used to improve adsorption properties and effects [8].…”

“…Breakthrough time,2 Exhaustion time 3. Breakthrough adsorption capacity: Q b = C 0 m is the adsorbent mass (g) and t is the operating time 5. Removal percentages of breakthrough: %R b = × 100 7.…”