No abstract

One of the most pollutants of water is organic dyes, which is usually come from industries of textile, leather and paper. In this work, activated carbon is used as adsorbent, which is prepared from the corn-cob (CCAC) to remove the methyl violet (MV) dye from prepared aqueous solutions. The amount of adsorption dyes were investigated by including the effect of different parameters such as, the agented time, initial dye MV concentration (10-50 g.L -1 ), effect of pH (3,6,8,10 and 12), temperature (288,308,328) K and adsorbent dosage (0.01-0.1g). The percentage of removal of MV by the CCAC is increased significantly with increasing the amount of the adsorbent and the solution pH, and the maximum was at pH 11.5, but its decreased with increasing the temperature and initial concentration of the dye. The two adsorption isotherm models (Langmuir and Freundlich) were used to investigate the interaction between the dye and prepared activated carbon, while the adsorption equilibrium data were best represented by the Freundlich detect the type of adsorption, which implies that the adsorption of textile dye onto the (CCAC) is heterogeneous with multilayers.

In general, nanostructured materials with specific size, shape and geometry have unique and different properties from bulk materials. Using reaction media with nanometer and micrometer dimensions, they can produce new nanomaterials with interesting and remarkable properties. In general, nano-reactors are nanometer-sized chambers in which chemical reactions can take place. of course, nanoreactors are somehow part of the reaction, and this is the main difference between them and micro-reactors. One of the useful solutions to achieve the environment of nanoreactors is the use of porous materials, so due to the importance of nanoreactors, porous structures of silicate and zeolite are among the most prominent and widely used compounds in this group.

The characterization of strain rate effects near glass transition temperature (T g ) gives important information on flow behavior of metallic glasses (MGs). For this purpose, the tensile strain rate jump test was carried out near glass transition temperature to evaluate the flow behaviors of ZrCoAl(Si) MG ribbons. The primary thermal analyses showed that the Si minor addition into the ZrCoAl alloy leads to the betterment of thermal stability and the glass forming ability (GFA), correlated with the small size of Si atoms and subsequent formation of denser atomic clusters and thermodynamically liquid stabilization in the system. The tensile strain rate jump test indicated that minor adding of Si element decreases the sensitivity of glassy alloy to the flow stress and improves the stability of amorphous structure under increase in the strain rate and applied temperature. It was also observed that the viscosity behavior is more stable with the increase of the strain rate and temperature in the Si-added sample, implying the high capability of viscoplastic response in this state.

It is essential to eliminate antibiotics from water due to their possible harm to living creatures and the growth of resistant microorganisms. The present study focuses on paracetamol inhibition utilizing carbon nanotubes (CNTs). Fourier transform infrared, field emission-scanning electron microscopy, and transmission electron microscopy techniques were used to study the fabricated CNTs' physical and chemical properties. Several concentrations of medication (10-100 mg L -1 ), pH solution (2.2-10.2), the weight of CNTs (0.002-0.08 g), and temperature solution (10-30 o C) were used to estimate the adsorption studies. The obtained results indicated that a concentration of 50 mg L -1 , a pH of 6.6, an adsorbent amount of 0.02 g, and a contact time of 2 h are optimal conditions for removing 95.40% of the drug from water. The results of the adsorption study indicate that the percentage of removal increases as the weight of the surfaces increases. The thermodynamic factors (∆G o ), (∆H o ), and (∆S o ) were estimated, and the negative values of ∆G o indicated that the removal method was spontaneous at various temperatures. The correlation coefficient value at R 2 = 0.98881 indicates that the adsorption method has high applicability concerning the second-order model. In contrast, the applicability of the first-order model and Elkovich equation are moderate, as indicated by the correlation coefficient values of R 2 = 0.70844 and R 2 = 0.84540, respectively. Based on the findings, the prepared CNTs may serve as a promising, environmentally friendly, cost-effective, and effective material for paracetamol drugs.