Pyrogenic Carbon Enhances Hydroxyl Radical Generation during Microbial Transformation of Ferrihydrite at Redox Interfaces.

Pyrogenic carbon (PC) is redox-active and facilitates the microbial reduction of Fe(III) (oxyhydr)oxides to Fe(II) under conditions. The oxygenation of Fe(II) under conditions produces hydroxyl radicals (OH). However, the influence of PC on this process remains largely unknown.

Humic acid inhibits hydroxyl radical generation during oxygenation of Fe(II) on goethite surface.

The dark formation of hydroxyl radicals (•OH) by the oxidation of Fe(II) has been increasingly recognized at anoxic-oxic interface. Minerals play significant roles on oxidation of Fe(II) owing to the adsorption changed the reactivity of Fe(II). However, the impact of dissolved organic matter (DOM) on the oxidation of mineral adsorbed Fe(II) and •OH generation remains unknown.

The Effect of Water Co-adsorption on the Adsorption of Formaldehyde in Fe-HHTP-MOF Metal-Organic Materials.

Because of the existence of moisture in indoor air, it is still a serious challenge to capture formaldehyde indoors with the metal-organic material Fe-HHTP-MOF. To explore the relationship between the structure and performance of Fe-HHTP-MOF in dry and humid air, molecular dynamics simulation was used to study the adsorption amount of Fe-HHTP-MOF for formaldehyde and water under different temperatures and adsorption pressures, as well as the adsorption amount of Fe-HHTP-MOF for formaldehyde in the presence of both water and formaldehyde, and the differences in adsorption of formaldehyde and water by Fe-HHTP-MOF were compared and analyzed when water coexisted. The results show that under single-component isothermal adsorption, the hydrogen bond energy formed by Fe-HHTP-MOF adsorbing HO molecules is much greater than the van der Waals energy formed by adsorbing HCHO molecules.

Effect of Thermal Aging on Mechanical Properties and Morphology of GF/PBT Composites.

The effects of thermal aging at 85~145 °C in air on the tensile and flexural mechanical properties of 20% glass fiber (GF)-reinforced commercial grade polybutylene terephthalate (PBT) composites were studied. The results showed that as the aging temperature increased, the tensile and flexural strength of the GF/PBT composites significantly decreased. However, the elastic modulus of the composites was almost independent of aging.

Hydrochemical characteristics and quality assessment of groundwater for irrigation use in central and eastern Songnen Plain, Northeast China.

The hydrochemical characteristics of groundwater in Songnen Plain's agricultural area were analyzed based on aquifer types and topography classification to evaluate irrigation suitability and factors influencing groundwater quality. Samples of different groundwater types and topographical conditions within the research area were collected and chemical indices, such as sodium adsorption ratio, %Na, residual sodium carbonate, and magnesium hazard values, were calculated to assess the groundwater suitability for irrigation. The results indicated that groundwater was generally neutral, with low total dissolved solids and slightly high hardness; the dominant anion in groundwater was HCO, while Ca was the relatively stable primary cation found in water samples from the high plain and river valley plain.