Lead (Pb) sorption to hydrophobic and hydrophilic zeolites in the presence and absence of MTBE
- Authors
- Zhang, Yunhui; Alessi, Daniel S.; Chen, Ning; Luo, Mina; Hao, Weiduo; Alam, Md Samrat; Flynn, Shannon L.; Kenney, Janice P. L.; Konhauser, Kurt O.; Ok, Yong Sik; Al-Tabbaa, Abir
- Issue Date
- 15-Oct-2021
- Publisher
- ELSEVIER
- Keywords
- Advanced spectroscopic analysis; Clean water and sanitation; Sorbent; Surface coating; Zeolite
- Citation
- JOURNAL OF HAZARDOUS MATERIALS, v.420
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF HAZARDOUS MATERIALS
- Volume
- 420
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/137656
- DOI
- 10.1016/j.jhazmat.2021.126528
- ISSN
- 0304-3894
- Abstract
- The co-contamination of the environment by metals and organic pollutants is a significant concern, and one such example is lead (Pb) and methyl tert-butyl ether (MTBE) due to their historic use as fuel additives. Clinoptilolite is an abundant and efficient zeolite for metal removal, but the potential interference of co-existing organic pollutants on metal removal, such as MTBE, have rarely been discussed. In this study, a combination of batch sorption tests and synchrotron-based X-ray absorption spectroscopic analyses were employed to investigate Pb sorption mechanism(s) onto clinoptilolite in the presence and absence of MTBE. A comparison was made to synthetic ZSM-5 zeolite to gain insights into differences in Pb binding mechanisms between hydrophilic (cli-noptilolite) and hydrophobic (ZSM-5) zeolites. Site occupancy and surface precipitation contributed equally to Pb removal by clinoptilolite, while surface precipitation was the main Pb removal mechanism for ZSM-5 followed by site occupancy. Despite the negligible effect of 100 mg/L MTBE on observed Pb removal from solution by both zeolites, a surface-embedded Pb removal mechanism, through the Mg site on clinoptilolite surface, arises when MTBE is present. This study provides an understanding of atomic-level Pb uptake mechanisms on zeolites, with and without co-contaminating MTBE, which aids in their application in water treatment at co-contaminated sites.
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Collections - College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles
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