Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 402, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.123779
Keywords
Titanate nanotubes; MnO2; Peroxymonosulfate; DFT; Carbamazepine
Categories
Funding
- National Natural Science Foundation of China (NSFC) [21906001, 51721006]
- Beijing Nova Program [Z19111000110000]
- China Postdoctoral Science Foundation [2020M670049]
- Opening Foundation of Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria [201901]
- Central Committee Guides Local Science and Technology Development Project of Hubei Province, China [2019ZYYD068]
- Engineering Research Center for Clean Production of Textile Dyeing and Printing, Ministry of Education
Ask authors/readers for more resources
This study successfully degraded and mineralized CBZ using AMnTi composite material, increasing the degradation rate of CBZ. The high catalytic activity of AMnTi is attributed to its unique structure, leading to efficient charge transfer and catalytic activation through Mn-O-Ti linkage, and a Mn-Ti cycle mediating catalytic activation of PMS was discovered. Both hydroxyl and sulfate radicals played key roles in CBZ degradation.
Developing efficient pharmaceuticals and personal care products (PPCPs) degradation technologies is of scien-tifical and practical importance to restrain their discharge into natural water environment. This study fabricated and applied a composite material of amorphous MnO2 nanoparticles in-situ anchored titanate nanotubes (AMnTi) to activate peroxymonosulfate (PMS) for efficient degradation and mineralization of carbamazepine (CBZ). The degradation pathway and toxicity evolution of CBZ during elimination were deeply evaluated through produced intermediates identification and theoretical calculations. AMnTi with a composition of (0.3MnO(2))center dot (Na1.22H0.78Ti3O7) offered high activation efficiency of PMS, which exhibited 21- and 3-times degradation rate of CBZ compared with the pristine TNTs and MnO2, respectively. The high catalytic activity can be attributed to its unique structure, leading to a lattice shrinkage and small pores to confine the PMS molecule onto the interface. Therefore, efficient charge transfer and catalytic activation through Mn-O-Ti linkage occurred, and a Mn-Ti cycle mediating catalytic PMS activation was found. Both hydroxyl and sulfate radicals played key roles in CBZ degradation. Theoretical calculations, i.e., density functional theory (DFT) and computational toxicity calculations, combined with intermediates identification revealed that CBZ degradation pathway was hydroxyl addition and N-C cleavage. CBZ degradation in this system was also a toxicity-attenuation process.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available