title: Insights into the adsorption capacity and breakthrough properties of a synthetic zeolite against a mixture of various sulfur species at low ppb levels.
abstract: The sorptive removal properties of a synthetic A4 zeolite were evaluated against sulfur dioxide (SO2) and four reference reduced sulfur compounds (RSC: hydrogen sulfide (H2S), methanethiol (CH3SH), dimethyl sulfide (DMS, (CH3)2S), and dimethyl disulfide (DMDS, CH3SSCH3). To this end, a sorbent bed of untreated (as-received) A4 zeolite was loaded with gaseous standards at four concentration levels (10-100 part-per-billion (ppb (v/v)) at four different volumes (0.1, 0.2, 0.5, and 1 L increments) in both increasing (IO: 0.1-1.0 L) and decreasing volume order (DO: 1.0 to 0.1 L). Morphological properties were characterized by PXRD, FTIR, and BET analysis. The removal efficiency of SO2 decreased from 100% for all concentrations at 0.1 L (initial sample volume) to ∼82% (100 ppb) or ∼96% (10 ppb) at 3.6 L. In contrast, removal efficiency of RSC was near 100% at small loading volumes but then fell sharply, irrespective of concentration (10-100 ppb) (e.g., 32% (DMS) to 52% (H2S) at 100 ppb). The adsorption capacity of zeolite, if expressed in terms of solid-gas partition coefficient (e.g., similar to the Henry's law constant (mmol kg(-1) Pa(-1))), showed moderate variabilities with the standard concentration levels and S compound types such as the minimum of 2.03 for CH3SH (at 20 ppb) to the maximum of 13.9 for SO2 (at 10 ppb). It clearly demonstrated a notable distinction in the removal efficiency of A4 zeolite among the different S species in a mixture with enhanced removal efficiency of SO2 compared to the RSCs.
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, 222, Wangsimni-Ro, Seoul 133-791, Republic of Korea.
authors.forename: Kowsalya
authors.initials: K
authors.lastname: Vellingiri
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, 222, Wangsimni-Ro, Seoul 133-791, Republic of Korea. Electronic address: kkim61@hanyang.ac.kr.
authors.forename: Ki-Hyun
authors.initials: KH
authors.lastname: Kim
authors.affiliation: Dept. of Environment and Energy, Sejong University, Seoul 143-747, Republic of Korea.
authors.forename: Eilhann E
authors.initials: EE
authors.lastname: Kwon
authors.affiliation: Central Scientific Instruments Organisation (CSIR-CSIO), Sector 30 C, Chandigarh 160030, India; Academy of Scientific and Innovative Research, CSIR-CSIO, Sector 30 C, Chandigarh 160030, India.
authors.forename: Akash
authors.initials: A
authors.lastname: Deep
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, 222, Wangsimni-Ro, Seoul 133-791, Republic of Korea.
authors.forename: Sang-Hee
authors.initials: SH
authors.lastname: Jo
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, 222, Wangsimni-Ro, Seoul 133-791, Republic of Korea.
authors.forename: Jan E
authors.initials: JE
authors.lastname: Szulejko
mesh_terms: D000327:Adsorption; D000393:Air Pollutants / Q000737:chemistry* / Q000302:isolation & purification; D004220:Disulfides / Q000737:chemistry; D006862:Hydrogen Sulfide / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013438:Sulfhydryl Compounds / Q000737:chemistry; D013440:Sulfides / Q000737:chemistry; D013457:Sulfur Compounds / Q000737:chemistry*; D013458:Sulfur Dioxide / Q000737:chemistry; D014961:X-Ray Diffraction; D017641:Zeolites / Q000737:chemistry*
chemical_list: D000393:Air Pollutants; D004220:Disulfides; D013438:Sulfhydryl Compounds; D013440:Sulfides; D013457:Sulfur Compounds; D013458:Sulfur Dioxide; D017641:Zeolites; C005231:methylmercaptan; C021181:dimethyl disulfide; C004784:dimethyl sulfide; D006862:Hydrogen Sulfide
keywords: A4 zeolites; Breakthrough; GC-FPD; Sorptive removal; TD