| Title: | Zinc-doped titanium oxynitride as a high-performance adsorbent for formaldehyde in air |
| Author(s): | Tran TY; Verma S; Younis SA; Kim KH; |
| Address: | "Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, 04763, Republic of Korea. Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, 04763, Republic of Korea; Analysis and Evaluation Department, Egyptian Petroleum Research Institute, Nasr City, 11727 Cairo, Egypt. Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, 04763, Republic of Korea. Electronic address: kkim61@hanyang.ac.kr" |
| DOI: | 10.1016/j.jhazmat.2023.131203 |
| ISSN/ISBN: | 1873-3336 (Electronic) 0304-3894 (Linking) |
| Abstract: | "The potential utility of titanium oxynitride doped with 5% zinc (ZnTON) has been investigated as an adsorbent for the treatment of gaseous formaldehyde (FA) using a fixed-bed adsorption system. The adsorption capacity of ZnTON, when estimated at 10%/100% breakthrough (BT) levels from a dry feed gas consisting of 10 Pa FA, was far superior to two reference materials (i.e., commercial P25-TiO(2) and activated carbon (AC)) by factors of 1.7/1.3 and 10/2.5, respectively. The adsorption capacity of ZnTON increased with the increase in the initial feeding concentration of FA (5-12.5 Pa), while decreasing with the rising temperature (25-100 (o)C). An increase in moisture level (0-100% relative humidity) also led to 5.4- and 2.5-fold reductions in adsorption capacity of ZnTON at 10% and 100% BT levels, respectively. Thermodynamically, the adsorption of FA onto ZnTON is an exothermic (DeltaH(o) = - 9.69?ª+kJ.mol(-1)) to be feasible in nature based on physisorption mechanism. Further, the adsorption of FA onto ZnTON was governed by surface interactions and monolayer surface coverage (Van der Waal's force/electrostatic attraction), as it obeyed the Langmuir isotherm and pseudo-second-order kinetic models. Regeneration tests indicated a positive effect of moisture on FA desorption and durability of ZnTON (i.e., over three adsorption-desorption cycles). This study offers valuable mechanistic insights into the synthesis of an advanced adsorbent for the efficient removal of hazardous volatile organic compounds under near-ambient conditions" |
| Keywords: | Adsorption mechanism Breakthrough adsorption Formaldehyde Relative humidity Zinc titanium oxynitride; |
| Notes: | "PubMed-not-MEDLINETran, Thi Yen Verma, Swati Younis, Sherif A Kim, Ki-Hyun eng Netherlands 2023/03/24 J Hazard Mater. 2023 Jun 5; 451:131203. doi: 10.1016/j.jhazmat.2023.131203. Epub 2023 Mar 15" |
