Details

Autor(en) / Beteiligte

• 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

Titel

Lead (Pb) sorption to hydrophobic and hydrophilic zeolites in the presence and absence of MTBE

Ist Teil von

• Journal of hazardous materials, 2021-10, Vol.420, p.126528-126528, Article 126528

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 (clinoptilolite) 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. [Display omitted] •Aqueous Pb removal by clinoptilolite was not impacted by co-contaminating MTBE.•Pb uptake mechanisms on clinoptilolite: site occupancy and surface precipitation.•PbO∙(H2O) type surface precipitation is enhanced on both zeolites at higher pH.•Surface-embedded Pb uptake at Mg site on clinoptilolite arises in presence of MTBE.