Adsorption of Chlorinated Hydrocarbon Pollutants on Silica Gel

Abstract

A survey of indoor air pollutants was conducted. The removal of six chlorinated hydrocarbons. including methyl chloride, methylene chloride, chloroform. carbon tetrachloride, 1.1.1-trichloroethane, and tetrachloroethylene was performed using adsorption methods. The equilibrium uptakes of the six indoor pollutants on silica gel were determined gravimetrically at 25°C and at pressures up to saturation. The modified potential theory proposed by Dubinin and coworkers was used to correlate the adsorption data.

Desiccant wheels as gas-phase absorption (GPA) air cleaners: evaluation by PTR-MS and sensory assessment

“…Desiccant materials are a subset of sorbents that are normally used for dehumidification. Previous studies showed that they can also be used to remove gases other than water vapor from air (Hines and Ghosh, 1993; Hines et al., 1993a; Kuo and Hines, 1988 and Popescu and Ghosh, 1999). Kuo and Hines (1988) studied uptake of six chlorinated hydrocarbons (methyl chloride, methylene chloride, chloroform, carbon tetrachloride, 1,1,1‐trichloroethane and tetrachloroethylene) on silica gel and concluded that silica gel can be effectively used to both dehumidify as well as remove pollutants from indoor air.…”

Adsorption of Methyl Chloride on Molecular Sieves, Silica Gels, and Activated Carbon

“…The activated carbon AC8‐12 exhibited the highest heat of adsorption of 50.9 kJ mol −1 , while the molecular sieve Mol5A exhibited the lowest heat with 10.0 kJ mol −1 . These values, which are within the ranges reported by earlier researchers, e.g., , are indicative of a physisorption type of interactions between the MeCl and the adsorbent, which in turn, implies easy regeneration of the adsorbents.…”

“…There have been a number of isolated studies on the adsorption of MeCl on various adsorbents, such as metal surfaces , , , charcoal , , silica gels , , zeolites , and activated carbon fibers ; see Tab. for a summary of few selected studies.…”

Experimental evaluation on energy performance of innovative clean air heat pump for indoor environment control in summer and winter seasons

“…Recent studies [21][22][23] have found that sorption filtration is more effective than other approaches. Desiccant materials are a subset of sorbents that are normally used for dehumidification, and they can also be used to remove gases other than water vapor from air in previous studies [24][25][26][27][28][29]. In the study of Fang et al [28], the air cleaning efficiency of silica gel rotor was evaluated by PTR-MS and sensory assessment, and the results revealed that the measured VOCs were removed effectively by the desiccant wheel with an average efficiency of 94% or higher; more than 80% of the sensory pollution load was removed and the percentage dissatisfied with the air quality decreased from 70% to 20%.…”