FeOOH-loaded MnO2 nano-composite: An efficient emergency material for thallium pollution incident. (1st May 2017)

• Record Type: Journal Article
• Authors: Chen, Meiqing; Wu, Pingxiao; Yu, Langfeng; Liu, Shuai; Ruan, Bo; Hu, Haihui; Zhu, Nengwu; Lin, Zhang
• Is Part Of: Journal of environmental management. Volume 192(2017)
• Page Start: 31
• Page End: 38
• Publication Date: 2017-05-01
• Subjects: Thallium(I) -- FeOOH-loaded MnO2 -- Emergency material -- Thallium pollution incident; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2017.01.038
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: A FeOOH-loaded MnO2 nano-composite was developed as an emergency material for Tl(I) pollution incident. Structural characterizations showed that FeOOH successfully loaded onto MnO2, the nanosheet-flower structure and high surface area (191 m 2 g −1 ) of material contributed to the excellent performance for Tl(I) removal. FeOOH-loaded MnO2 with a Fe/Mn molar ratio of 1:2 exhibited a noticeable enhanced capacity for Tl(I) removal compared to that of pure MnO2 . The outstanding performance for Tl(I) removal involves in extremely high efficiency (achieved equilibrium and drinking water standard within 4 min) and the large maximum adsorption capacity (450 mg g −1 ). Both the control-experiment and XPS characterization proved that the removal mechanism of Tl(I) on FeOOH-loaded MnO2 included adsorption and oxidation: the oxidation of MnO2 played an important role for Tl(I) removal, and the adsorption of FeOOH loaded on MnO2 enhanced Tl(I) purification at the same time. In-depth purification of Tl(I) had reach drinking water standards (0.1 μg L −1 ) at pH above 7, and there wasn't security risk produced from the dissolution of Mn 2+ and Fe 2+ . Moreover, the as-prepared material could be utilized as a recyclable adsorbent regenerated by using NaOH-NaClO binary solution. Therefore, the synthesized FeOOH-loaded MnO2 in this study has the potential to be applied as an emergency material for thallium pollution incident. Graphical abstract: Highlights: The FeOOH-loaded MnO2 with flower-like structure was developed. The FeOOH-loaded MnO2 showed a fast removal rate for Tl(I). The material had higher adsorption capacity (450 mg g −1 ) for Tl(I) than MnO2 . The removal mechanism existed adsorption and oxidation at the same time. The material has potential to be used for thallium pollution incident.