Preparation of Kaolin Composites and Its Adsorption for Sb(Ⅲ)

Antimony is an important element in the production of flame retardants and semiconductor materials. In the process of antimony mining, it may cause local environmental pollution, which has adverse effects on human health, and the development of economical and efficient adsorbents to remove antimony from wastewater has become a hot research topic. In this paper, the hydrothermal synthesis method was adopted, and purified Kaolin was selected as the carrier, potassium permanganate, manganese chloride and ferric chloride are the metal sources, urea is the precipitant, and sodium dodecyl benzene sulfonate is the structure guide agent. Under the conditions of 5% mass fraction of dispersant, loading temperature of 140 ℃, reaction time of 8 h, mass ratio of iron to manganese of 1.84:1, and mass of precipitant of 0.9 g, the composites prepared were effective in adsorbing the Sb(Ⅲ) from the wastewater. The optimum adsorption efficiency of the prepared composites on Sb(Ⅲ) is 92.83%, which showed excellent adsorption performance

Numerical Investigation of a Two-Phase Nanofluid Model for Boundary Layer Flow Past a Variable Thickness Sheet

Abstract This paper investigates heat and mass transfer of nanofluid over a stretching sheet with variable thickness. The techniques of similarity transformation and homotopy analysis method are used to find solutions. Velocity, temperature, and concentration fields are examined with the variations of governing parameters. Local Nusselt number and Sherwood number are compared for different values of variable thickness parameter. The results show that there exists a critical value of thickness parameter β c (β c ≈0.7) where the Sherwood number achieves its maximum at the critical value β c . For β&gt;β c , the distribution of nanoparticle volume fraction decreases near the surface but exhibits an opposite trend far from the surface.</jats:p

Effects of fractional mass transfer and chemical reaction on MHD flow in a heterogeneous porous medium

This paper presents a study on space fractional anomalous convective-diffusion and chemical reaction in the magneto-hydrodynamic fluid over an unsteady stretching sheet. The fractional diffusion model is derived from decoupled continuous time random walks in a heterogeneous porous medium. A novel transformation which features time finite difference is introduced to reduce the governing equations into ordinary differential ones in each time level. Numerical solutions are established by an implicit finite difference scheme. The stability and convergence of the method are analyzed. Results show that increasing fractional derivative parameter enhances concentration near the surface while an opposite phenomenon occurs far away from the wall. There is a reduction of mass transfer rate on the sheet with an increase in the fractional derivative parameter. Moreover, the numerical solutions are compared with exact solutions and good agreement has been observed.</p

Anomalous diffusion in rotating Casson fluid through a porous medium

This paper investigates the space-fractional anomalous diffusion in unsteady Casson fluid through a porous medium, based on an uncoupled continuous time random walk. The influences of binary chemical reaction and activation energy between two horizontal rotating parallel plates are taken into account. The governing equations of motion are reduced to a set of nonlinear differential equations by time derivatives discretization and generalized transformation, which are solved by bvp4c and implicit finite difference method (IFDM). Stability and convergence of IFDM are proved and some numerical comparisons to the previous study are presented with excellent agreement. The effects of involved physical parameters such as fractional derivative parameter, rotation parameter and time parameter are presented and analyzed through graphs. Results indicate that the increase of fractional derivative parameter triggers concentration increase near the lower plate, while it causes a reduction near the upper plate. It is worth mentioning that the decrease of heat transfer rate on the plate is observed with the higher time parameter.</p

Indole-3-propionic acid, a product of intestinal flora, inhibits the HDAC6/NOX2 signaling and relieves doxorubicin-induced cardiomyocyte damage

The heart failure-gut hypothesis indicates that damage to intestinal mucosa leads to increased microbial translocation, resulting in alterations in metabolites entering the blood circulation. This process promotes the development of heart failure. This study aimed to reveal the involvement of indole-3-propionic acid (IPA), a microbiota-derived tryptophan metabolite, in heart failure. Human cardiomyocytes AC16 was treated with doxorubicin to induce in vitro heart failure model, the influences of IPA on the cellular viability, apoptosis, inflammation and oxidative stress were evaluated. Molecular docking and western blotting were used to initially illustrate the potential relationship between IPA and HDAC6. Through HDAC6 overexpression, its mediating role in the regulatory mechanism of IPA in the above aspects was further investigated. IPA was found to reduce the apoptosis, inflammation and oxidative stress in doxorubicin-treated cells. The visualized structure displayed that IPA bound to HDAC6 and that IPA reduced HDAC6 level. Additionally, HDAC6 overexpression reversed the regulation of IPA in the above aspects, indicating the HDAC6/NOX2 signals mediated the mechanism of IPA. Together, the present study revealed that IPA reduced oxidative stress, inflammatory response and apoptosis in cardiomyocytes via inhibiting the HDAC6/NOX2 signaling. The findings suggest that gut microbiota metabolites have potential in the treatment of heart failure