XPS study of MnO₂ minerals treated by bioleaching

Abstract

XPS has been used to follow the change of the ore surface composition during bioleaching with a mixed culture of microorganisms. In the original sample, the presence of MOO, togetber with silica and alumina is observed. D u r i n g bioleaching, Mn(IV) is p r e v e l y reduced to Mn(II) and signals due to the presence of the microorganisms appear in the C 1s and N 1s spectra.In the residual sample, a comiderable amount of Ma .ssociated with the cells of the micraorganisms or reprecipitated in the form of the Mn(OH), is present on the surface of tbe ore. This Ma species can be removed completely by treatment with a dilute solution of HCL INTRODUCTION EXPERIMENTAL

Wafer Bonding of SiC-AlN at Room Temperature for All-SiC Capacitive Pressure Sensor

“…Moreover, their Al 2p peak positions have visible difference. The Al 2p peak of the AlN film locates at ~74.1 eV, agreeing with the published data [29], while the peak of the etched AlN film is shifted towards the peak of Al-O at ~75.0 eV [30]. This further confirms the oxidation of AlN during deposition, and the internal AlN seems more seriously oxidized.…”

An X-ray photoelectron spectroscopy study of elements on the surface of aerosol particles

“…For eight samples, the binding energy of Al 2p is mainly at 74.9 eV and Al exists in the form of Al 2 O 3 on particle surface (DiCastro, Polzonetti, Contini, Cozza, & Paponetti, 1990). The binding energy of Cd 3d 5/2 is located at 407.3 eV, which indicating that Cd exists in the form of CdO (Setty & Sinha, 1986).…”

Low-temperature synthesized Li4Mn5O12-like cathode with hybrid cation- and anion-redox capacities

“…The fitting peaks are at 642.58 eV and 654.08 eV, which are the characteristic peaks of Mn 4+ 2p 3/2 and Mn 4+ 2p 1/2 , respectively. 16,17 The microstructure and morphology of the Li 4 Mn 5 O 12 -like powders were also observed through field emission scanning electron microscopy (FE-SEM), as shown in Fig. S2a and S2b (ESI †).…”