The surface hydroxyl and oxygen vacancy dependent Cr(vi) adsorption performance of BiOCl

Abstract

The migration and bioavailability of Cr(vi) are determined by its adsorption behavior, which is sensitive to the coordination environment of mineral surfaces, especially natural surface defects, such as surface hydroxyls and oxygen vacancies.

Mechanistic insights into dual active sites in Au@W18O49 electrocatalysts for the hydrogen evolution reaction

“…3c) show a resonance peak at the g value of 2.003, implying the presence of OVs in the W 18 O 49 samples. 32 After the Au NP loading, the peak intensity at 2.003 reduced, which was ascribed to the occupation of Au atoms on the OVs of W 18 O 49 . The UV-DRS spectra of W 18 O 49 exhibited an absorption tail at a wavelength larger than 400 nm, which was ascribed to the collective oscillation of excess electrons around the OVs (Fig.…”

Critical Review of Advances in Engineering Nanomaterial Adsorbents for Metal Removal and Recovery from Water: Mechanism Identification and Engineering Design

“…For example, the bond strength of a formed-loose out-sphere surface complex with T d symmetry of Cr(VI) on BiOCl is considerably weak that the interaction could be easily broken using a low-concentration acid solution. 69 Likewise, a NA screening step could be initiated by revealing the reactivity of NAs at micro-and macroscale levels. The microscale reactivity involves parameters, such as binding energy, Gibbs free energies, bond length, and electronic configuration of NAs with distinct structures, e.g., composition, surface facet, and defect site, from DFT and XAFS.…”

“…In addition, the bond strength and adsorption type of the adsorbate–adsorbent complex indicate NA regeneration feasibility. For example, the bond strength of a formed-loose out-sphere surface complex with T d symmetry of Cr­(VI) on BiOCl is considerably weak that the interaction could be easily broken using a low-concentration acid solution …”

Incorporation of Cu into Goethite Stimulates Oxygen Activation by Surface-Bound Fe(II) for Enhanced As(III) Oxidative Transformation

“…The surface chemistry of metal oxides, such as the crystalline facet and defect, plays a pivotal role in catalytic chemistry , and in interfacial adsorption , and the Fenton-like reaction of pollutants on Fe­(III) oxyhydroxides. In particular, oxygen vacancies (OV) engineering on oxide surfaces have been found to enhance their catalytical performances by providing traps for accumulating excess electrons .…”