Layer symmetry and irradiation dominate the oxidation capability of birnessite on biogenic isoprene.

The climate-active gas isoprene (CH) is one of the most abundant biogenic volatile organic compounds (VOCs). Soil is one of the significant sinks for isoprene, yet the role played by the naturally abundant birnessite in the soil surface layer during the oxidation of isoprene remains largely unknown. This study investigates the reactions of isoprene with triclinic and hexagonal birnessite on the Earth's surface environments.

Autocatalytic degradation of Cu-EDTA in the Calcite/PMS system: Singlet oxygen and Cu(III).

The simultaneous removal of heavy metal complexes (HMCs) and heavy metal ions presents a significant challenge in treating wastewater. To address this, we propose a Calcite/Peroxymonosulfate (Calcite/PMS) system aimed at simultaneously decomplexing Cu-EDTA and removing Cu ions. Calcite/PMS system could achieve 99.

The pH-sensitive transformation of birnessite and its effect on the fate of norfloxacin.

Birnessite plays a crucial role in regulating the fate of contaminants in soil, which is affected by the crystal structure of birnessite. In this study, the transformation of triclinic birnessite to hexagonal birnessite was examined at various pH values, and their reactivity towards norfloxacin was investigated. The findings indicate that the conversion from triclinic birnessite to hexagonal birnessite occurs under pH conditions lower than 7.

Ultrathin MnO-Coated FeOOH Catalyst for Indoor Formaldehyde Oxidation at Ambient Temperature: New Insight into Surface Reactive Oxygen Species and In-Field Testing in an Air Cleaner.

Herein, we tailored a series of ultrathin MnO nanolayers coated on the surface of commercial goethite (α-FeOOH) by a facile in situ chemical precipitation method. α-FeOOH inhibited the MnO crystal growth via the incorporation of K ions between MnO and α-FeOOH interfaces during the synthesis process. The hybrid design of MnO with an ultrathin nanolayer structure could reduce the electron transfer resistance and bring abundant oxygen vacancies, accelerating the activation of molecular O to generate more oxygen-free radical species and favoring the thermodynamic HCHO oxidation.

Effect of iron minerals during coaling on the transformation of NO in the presence of NH: Take pyrite as an example.

Pyrite, a naturally occurring mineral, can be found extensively in coal. The change in the pyrite structure that occurs during coaling process, the ability of the pyrite-derived α-FeO to convert NO in the presence of NH before catalyst bed and the kinetic study were investigated in this work. The pyrite-derived α-FeO was obtained by calcining at 500, 600, 700, 800 °C and was characterized by the X-ray diffraction (XRD), N physisorption, the X-ray photoelectron spectrometer (XPS), the scanning electron microscope (SEM), UV-visible near-infrared spectroscopy (UV-vis DRS), the temperature-programmed desorption of ammonia (NH-TPD) and the in situ diffuse reflectance infrared Fourier transform spectroscopy (in-situ DRIFTS).