•This project provided the mercury (II) adsorption mechanism on efficient adsorbent such as copper oxide nanoparticles.•The copper oxide nanoparticles showed large adsorption capacity for mercury ...(II).•Response surface methodology to analyze the data.•Box–Behnken design matrix to design the experiments.
Response surface methodology was practicable to optimize the mercury (II) removal using copper oxide nanoparticles in an aqueous matrice. The copper oxide nanoparticles structure was performed by TEM, SEM, XRD and BET. The experiment reactions were carried out based on a Box–Behnken design (BBD) and evaluated using RSM. Batch mode tests were conducted to prognosticate the adsorption equilibrium. The three parameters influence on the mercury removal was inquired by a response surface methodological approach. In study, influence of adsorbent dose, pH and temperature on the mercury removal unto copper oxide nanoparticles has been performed. The importance of the independent factors and their interactions were investigated by the ANOVA. The optimum pH, adsorbent dose and temperature were obtained to be 9.0, 0.05g and 278K, respectively.
The aim of this study is to investigate the possibility of graphene oxide (GO) as an alternative adsorbent for aniline removal from aqueous solution. Adsorption properties of GO for aniline removal ...were regularly investigated, including pH effect, adsorbent dose, temperature, contact time and initial concentration. The adsorption amount of aniline decreased with increasing pH. The experimental data were evaluated by Langmuir, Freundlich, Temkin and Harkins–Jura models in order to describe the equilibrium isotherms. Equilibrium data fitted well to the Langmuir model. The kinetic parameters achieved at different concentrations were analyzed using a pseudo first-order, pseudo second-order kinetic equation and intra-particle diffusion model. The experimental data fitted very well the pseudo second-order kinetic model. Thermodynamic parameters (free energy change, enthalpy change, and entropy change) announced that the removal of aniline from GO was endothermic and spontaneous. The study showed that GO could be used as an efficient adsorbent material for the adsorption of aniline from aqueous solution.
The aim of this study was to understand the trends of teaching Computer Aided Design/Computer Aided Manufacturing (CAD/CAM) in the undergraduate dental curriculum in the MENA region by conducting an ...online survey among the undergraduate dental colleges in this region.
An online survey was conducted using Google Forms consisting of 20 questions that could be answered by "yes" or "no" responses, multiple-choice answers or in a descriptive, "open" format. A total of 55 participants from the MENA region representing their dental college were requested to participate in this study.
The response rate of the survey was 85.5% following the twofold follow-up reminders method. Although the vast majority of professors demonstrated vital knowledge in the practical use of CAD/CAM, the majority of them did not provide theoretical and practical training on CAD/CAM in their institutions. Among the schools with established levels of teaching CAD/CAM, nearly 50% of them provide both pre-clinical and clinical training on CAD/CAM. Despite the availability of extra-curricular training courses on CAD/CAM outside the university setting, there is a lack of advocating for students to enrol in those courses by the institutions. More than 80% of the participants agreed that CAD/CAM has a strong future in chair-side dental clinics and CAD/CAM needs to be incorporated within undergraduate studies.
Based on the results of the current study, it is understandable that an intervention is required by the dental education providers to cope with the growing demand for CAD/CAM technology for the current and future dental practitioners of the MENA region.
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•Silver sulfide nanoparticles were synthesized by chemical co-precipitation method.•Silver sulfide and copper-doped nanoparticles exhibited photocatalytic property under UV and ...visible light.•The particles exhibited excellent antimicrobial property.
The Ag2S and Cu doped Ag2S nanoparticles were prepared by simple chemical co-precipitation method and characterized by XRD, SEM, EDX, TEM, PL and UV–vis spectra. The photocatalytic activity of Ag2S and Cu doped Ag2S nanoparticles were investigated with Ofloxacin antibiotic, which is part of the fluoroquinolone family. The morphological study indicated that the products were spherical shape in with diameter size of 30nm. The photocatalytic results demonstrated that the Cu doping increased the photocatalytic efficiency of Ag2S nanoparticles. The outcome of antibacterial experiment under visible light irradiation indicate that the Cu doped Ag2S nanoparticles represent increased antibacterial performance compared with un-doped Ag2S nanoparticles.
Normative batch adsorption studies of Cefotaxime, Cefradine and Cefazolin onto the developed CdS-MWCNT nanocomposites were well elucidated and investigated. The whole experimentation was carried out ...as a function of several influential parameters such as adsorbent dose, pH, contact time, and temperature. The developed adsorbent i.e. CdS-MWCNT nanocomposites were found to have high specific surface area and prodigious adsorption capacity. Several adsorption isotherm models such as Freundlich, Langmuir, Temkin and Scatchard were applied for the examination of equilibrium data, but Langmuir isotherm was found to be well fitted and in good agreement with the equilibrium data. One of the key finding is that the adsorption capacity increases on increasing pH and decreasing temperature. Thermodynamic parameters such as Gibbs free energy, enthalpy and entropy were calculated, the analysis showed negative values of ΔG, which reveals the spontaneous nature, negative values of ΔH reveals the exothermic nature as well as physical nature of adsorption, additionally negative values of ΔS reveals the decreased disturbance interface of Cefotaxime, Cefradine and Cefazolin removal using CdS-MWCNT nanocomposites.
Pictorial representation of morphological and textural properties of the developed adsorbent. Display omitted
•CdS-MWCNTs were used as adsorbent for the removal of Cefotaxime, Cefradine and Cefazolin antibiotics.•Adsorption capacity increases with increase in pH.•Adsorption capacity increases with decrease in temperature.•Negative value of ΔH indicates the exothermic and physical nature of adsorption process.
We are employed in the present study of single-walled carbon nanotubes (SWCNTs), carboxylate group functionalized single-walled carbon nanotubes (SWCNT-COOH), graphene (G) and graphene oxide (GO) as ...alternative adsorbents for the removal of cationic dye Basic Red 46 (BR 46), from aqueous solution. Various physico-chemical parameters were studied such as electrical conductivity behaviors, contact time, solution pH, and dye concentration. The experimental results show that SWCNTs, SWCNT-COOH, G and GO are promising adsorbents for removing BR 46. The adsorption equilibrium data were analyzed using various adsorption isotherms, and the results have shown that adsorption behavior of BR 46 could be described reasonably well by the Langmuir isotherm. Results showed that the removal of BR 46 increased with increasing initial dye concentration, contact time and pH. Adsorption kinetics data were modeled using the pseudo-first and pseudo-second order, and intra-particle diffusion models. Results show that the pseudo-first order kinetic model for SWCNTs, SWCNT-COOH and the pseudo-second order for G and GO were found to correlate the experimental data well.
Aims: This study has internationally tested and refined a framework for institutionalizing and practicing health impact assessment (HIA). HIA is conducted differently in different contexts and ...recently HIA experts suggest that broader context, in which HIAs are carried out is linked to technical aspects of the HIA. Materials and Methods: A survey internationally attained viewpoints of academics and practitioners (n = 38) on the identified parameters of the framework including factors influencing HIA. Structural equation modeling (SEM) through SmartPLS was used to test for relations between the factors. Finally, the model was modified to reach an appropriate fit. Results: The framework emphasizes HIA Context, HIA Capacities including Institutional, Technical and Participation capacities, HIA Content, and HIA Outcomes as key factors in implementation and practice of HIA. This framework reflects the broad range of factors that influence HIA. All broad factors were perceived as significant influences on the practice of HIAs. Some fit measures, i.e., the standardized root mean square residual appear to be in the acceptable range. Conclusion: We have demonstrated the utility of SEM for developing and testing a framework to do HIA in different country contexts.
•WO3 NPs showed photocatalytic activity under visible and sunlight.•The maximum photo-activity observed at pH 6.•95.48% and 97.5% degradation of Lidocaine achieved in 1h under visible and sunlight.
...Lidocaine (LDC) is a prevalent positional drug of anesthetic and found in aqueous environments as a pollutant due to its widespread use. The indiscriminate use of the chemicals leads to its release into the environment and it is a crucial ecological problem. The removal of pharmaceutical pollutants from industrial effluent is a difficult task. Many biological and physical techniques are being routinely used for removal of these pharmaceutical pollutants. The present study reports on the use of tungsten trioxide (WO3) nanoparticles for the degradation of LDC by making use of the photocatalytic property of NPs. WO3 NPs was synthesized and characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), UV–Visible (UV–Vis) spectroscopy and Brunauer–Emmett–Teller (BET) techniques. WO3 NPs showed a maximum photocatalytic effect at pH 6 and it degraded 95.48% and 97.5% of LDC within 1h under visible and sunlight, respectively.
The material of CuS/polyvinyl alcohol-chitosan (CuS/PVACS) was prepared with a novel synthesis analysis. The crystallinity, morphological characteristics, and photocatalytic performance of the ...nano-materials were investigated by X-ray diffraction, field emission scanning electron microscopy X-ray photoelectron, and UV–vis spectrophotometry. The band gap values (Eg) was found as 2.50, and 2.04 eV for CuS, and CuS/PVACS nano-catalyst, respectively. The photo-degradation amount of the malachite green solutions which were degraded by CuS/PVACS in the UV-irradiation in 60 min was above 96.51%. The antibacterial properties of the CuS/PVACS has been evaluated versus (G+/G-) bacteria. The results of antibacterial performance indicated that CuS/PVACS nanocomposites have bacteriostatic behavior versus Escherichia coli, Pseudomonas syringae, Staphylococcus aureus and Streptococcus pneumoniae.
Adsorption of fluoride ion was done from its aqueous solution by using maghemite (γ-Fe2O3) nanoparticles. Effects of the major independent variables (temperature, adsorbent dose and pH) and their ...interactions during fluoride ion adsorption were determined by response surface methodology (RSM) based on three-level three-factorial Box–Behnken design (BBD). Optimized values of temperature, maghemite nanoparticle dose and pH for fluoride sorption were found as 313 K, 0.5 g/L, and 4, respectively. In order to investigate the mechanism of fluoride removal, various adsorption isotherms such as Langmuir, Freundlich, Temkin and Florry–Huggins were fitted. The experimental data revealed that the Langmuir isotherm gave a more satisfactory fit for fluoride removal. The adsorption process was rapid and obeyed pseudo-second-order kinetics. The values of thermodynamic parameters ΔG°, ΔH° and ΔS° indicated that adsorption was spontaneous and endothermic in nature.
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