RESUMO
In this study, low-cost pomelo peel wastes were used as a bio-sorbent to remove copper ions (e.g., Cu(II)) from aqueous solutions. Prior to testing its Cu(II) removal capability, the structural, physical and chemical characteristics of the sorbent were examined by scanning electron microscope (SEM), Fourier transform infrared (FTIR) spectroscopy, and Brunauer-Emmett-Teller (BET) surface area analysis. The impacts of the initial pH, temperature, contact time and Cu(II) feed concentration on the Cu(II) biosorption using modified pomelo peels were then assessed. Thermodynamic parameters associated to the biosorption clearly demonstrate that this biosorption is thermodynamically feasible, endothermic, spontaneous and entropy driven. Furthermore, adsorption kinetic data were found to fit very well with the pseudo-second order kinetics equation, highlighting that this process is driven by a chemical adsorption. Finally, an artificial neural network with a 4:9:1 structure was then established for describing the Cu(II) adsorption using modified pomelo peels with R2 values close to 0.9999 and to 0.9988 for the training and testing sets, respectively. The results present a big potential use of the as-prepared bio-sorbent for the removal of Cu(II), as well as an efficient green technology for ecological and environmental sustainability.
RESUMO
Objective: To evaluate the role of visual pretreatment in preventing emergence delirium in children receiving ophthalmic surgery. Methods: Four randomized controlled trials were identified in four databases, and a meta-analysis was conducted using RevMan 5.3. Results: The meta-analysis demonstrated a significantly lower incidence of postoperative emergence delirium (risk ratio: 0.39; 95% CI: 0.31-0.49) and propofol rescue (risk ratio: 0.29; 95% CI: 0.13-0.65) but comparable modified Yale Preoperative Anxiety Scale score (mean difference: -3.66; 95% CI: -9.96 to 2.65) and incidence of adverse events in the visual pretreatment group. Conclusion: Visual pretreatment is effective in preventing postoperative emergence delirium in children undergoing ophthalmic surgery without significant adverse effects and can also decrease the incidence of propofol rescue.
