Study of electrical conduction mechanisms of CaCu3Ti4O12–MgAl2O4 composite ceramics with NTC effect via in-situ XPS and complex impedance analysis

Yan, Meng-Han; Zhang, Ying; Zhang, Zhi-Fei; Li, Peng; Hao, Ji-Gong; Li, Wei; Han, Wei-Fang; Huang, Hai-Hua; Wang, Chun-Ming; Fu, Peng

doi:10.1016/j.solidstatesciences.2023.107372

Cited by 5 publications

(1 citation statement)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A magnesium target with a photon energy of 1253.6 eV was employed in a monochromator for the XPS, while the laboratory vacuum was adjusted to 5 × 10 −9 Pa. And the complete XPS spectrum was utilized for qualitative analysis. Split-peak fitting was also utilized to analyze the fine spectra of C 1s (282~290 eV), O 1s (528~540 eV), Pb 4f (136~148 eV), and Cd 3d (402~416 eV) [25,26].…”

Section: Characterization Of O-mwcnt Smentioning

confidence: 99%

Adsorption Kinetics and Mechanism of Pb(II) and Cd(II) Adsorption in Water through Oxidized Multiwalled Carbon Nanotubes

Li,

Cui,

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

Toxic heavy metals are ubiquitous in the aquatic environment and show a significant danger to human health. Carbon nanotubes have been extensively used in treating the contamination of groundwater due to their porous multi-layer nature. Batch tests revealed that oxidized multiwalled carbon nanotubes (O-MWCNTS) offer better removal of Pb(II). The removal rate of Pb(II) was 90.15% at pH 6 within 24 h, which was ~58% more than that of Cd(II). The removal rate decreased to 55.59% for Pb(II) and to 16.68% for Cd(II) when the initial concentration of Pb(II)/Cd(II) ranged from 5 to 15 mg·g−1. The removal rate in the competitive tests was about 60.46% for Pb(II) and 9.70% for Cd(II). The Langmuir model offered better description of the adsorptive data for both ions. And the Qm of Pb(II) was 5.73 mg·g−1, which was 2.39 mg·g−1 more than that of Cd(II) in a single-icon system, while Qm was 7.11 mg·g−1 with Pb(II) and 0.78 mg·g−1 with Cd(II) in competitive water. And thermodynamic tests further indicated that the activating energy of Pb(II) and Cd(II) was 83.68 and 172.88 kJ·mol−1, respectively. Lead and cadmium adsorbed on the surface of O-MWCNTS are antagonistic in the competitive system. Based on XPS analyses, it was concluded that the absorbed lead/cadmium species on O-MWCNTS were (-COO)2Pb, (-COO)Pb(-O)/(-COO)2Cd, and (-COO)Cd(-O). Additionally, they offered theoretical evidence supporting the practicality of using nanocomposite membranes as a means to remove cadmium and lead.

show abstract

Section: Characterization Of O-mwcnt Smentioning

confidence: 99%