Moral Identity as Moderator in the Relationship between Machiavellian Leadership perception and Employees’ Opportunistic Behaviors

This paper aims to examine the nature of the relationship between Machiavellian leadership perception and employees’ opportunistic behaviors, with the moderating role of moral identity. The study was conducted over a two years period, in which, a simple random sample was used with 295 questionnaires distributed on the employees of different service industries in Bahrain. Descriptive analysis, Simple and multiple regressions were used to analyze the data and test the hypotheses. The main results of the study indicate that there is a significant positive effect for Machiavellian leadership perception on employees’ opportunistic behaviors. They also indicate significant negative effects for both Internalization Moral Identity and Symbolization Moral Identity on employees’ opportunistic behaviors. Furthermore, the results show a partially moderating role for Internalization Moral Identity on the relationship between Machiavellian leadership perception and employees’ opportunistic behaviors. They also confirm a fully moderating role for Symbolization Moral Identity on the relationship between Machiavellian leadership perception and employees’ opportunistic behaviors

Removal of Methylene Blue Dyes from Aqueous System Using Composite Polymeric-Apatite Resins

Removal of cationic dyes from industrial effluents is still a big and challenging subject in the field of environmental purification. Millions of tons of cationic dyes are consumed by the textile, rubber, paper, and plastic industries. These dyes have thousands of different chemical structures. Most of them have special properties, such as high hydrophilicity and stability to light or heat. Adsorption is commonly used as a technique for removing dyes. Removal of cationic dyes by adsorption is a promising approach because of its low performance cost and easy technical access. The amount adsorbed of the dye onto the polymeric resin is studied with time for estimating the adsorption mechanism. The adsorption of dye with time shows that mixing period of 10 min is optimum for attaining equilibrium with respect to R1 and R2, while attaining equilibrium with R3 takes 60 min. This findings represent a rapid kinetic for adsorption of MB, particularly R1, on the prepared resins. Different kinetic models were applied on the obtained results and the kinetic parameters were determined. The kinetic models correlate the amount adsorbed of dye with time. The values of calculated adsorption capacity qe and the linear regression coefficient clarify that the studied kinetic model could not fit with the experimental results for adsorption of MB onto R1, R2, and R3. The results of the studied kinetic model clarify that the experimental results for adsorption of MB onto R1, R2, and R3 could be described by kinetic model supporting chemical adsorption. The sorption of MB could be favorably described by the pseudo-second-order kinetic model onto the composite resins. This finding refers to the participation of chemical adsorption within the adsorption mechanism for MB onto R1, R2, and R3

Rice husk templated water treatment sludge as low cost dye and metal adsorbent

AbstractThe preparation of adsorbents at low cost as alternatives to the expensive ones in the treatment processes of water and wastewater is the interest of the researchers worldwide. Here, a novel cheap mesoporous adsorbent was prepared via the recycling of wastes namely water treatment sludge and rice husk (RH) as textural modifier. Surface area and pore dimensions were optimized against RH ratio. The mesoporous sludge was employed in adsorption of rosaniline dye, Pb2+, Ni2+ and chlorine from aqueous solutions under dynamic experimental conditions. It was found that the initial dye concentration and textural structure of the adsorbent played important roles in adsorption capacity. The reusability test shows the ease desorption of dye with slightly alkaline water (pH=8) indicating the stability and reusability of the ceramic adsorbent for several times. For metallic cations, the characteristics (ionic radius and ΔHhyd) of ions affect the adsorption affinity. Chlorine adsorption is controlled by the cation exchange capacity(CEC)

High-Porosity Metal Foams: Potentials, Applications, and Formulations

This chapter is aimed as a concise review, but well-focused on the potentials of what is known as “High-porosity metal foams,” and hence, the practical applications where such promising media have been/can be employed successfully, particularly in the field of managing, recovering, dissipating, or enhancing heat transfer. Furthermore, an extensive comparison is conducted between the formulations presented so far for the geometrical and thermal characteristics concerning the heat and fluid flow in open-cell metal foams