Ionic liquids have drawn a lot of attraction due to their unique properties. In this paper, a simple, inexpensive, easy to handle, and efficient method for the synthesis of 1-(4-((1-carboxyethyl)carbamoyl)benzyl)pyridin-1-ium chloride and 1-(4-(((1-carboxyethyl)carbamothioyl)carbamoyl)benzyl)pyridin-1-ium chloride as two novel chiral ionic liquids based on the L-(+)-alanine amino acid is introduced. Their structures were confirmed via 1 H-NMR, 13 C-NMR and FT-IR spectroscopies. Minimum inhibitory concentration method was used to study their antibacterial properties. Their antioxidant properties were investigated on 2,2-diphenyl-1-picrylhydrazyl as a free radical. Results confirmed these compounds as strong antibacterial and antioxidant ionic liquids, capable of replacing many antibiotic, and potentially, anticancer compounds.
Mesoporous silica was synthesized by a chemical process and its efficiency was investigated for removal of cobalt (Co2+) ions from contaminated water in a laboratory scale. The characteristics of synthesized mesoporous were analyzed by SEM/TGA. Optimal conditions were determined for important parameters such as solution pH, the absorbent dose, the initial Co2+ concentration, and contact time by a single-variable method through the batch experiments. The SEM results confirmed the synthesized silica had high porosity with a honeycomb-like structure. The results showed that with an increasing adsorbent dose and contact time to the optimum, the efficiency of Co2+ adsorption increased. However, with increasing concentration of Co2+, the removal efficiency decreased. At optimal contact time (8 h), 85 % of Co2+ was removed. The maximum adsorption efficiency at pH =7, initial Co2+ concentration of 5 ppm, and at the adsorbent dose 0.3 g/50 ml, was 89%. The study of adsorption isotherm and kinetic models showed that the adsorption process followed the Freundlich isotherm (R2 = 0.9359) and the second-order kinetic model (R2=0.999). Therefore, the synthesized mesoporous silica presented a chemical adsorption mechanism for Co2+ removal from aqueous media and can be utilized in wastewater treatment containing divalent heavy metals such as Co2+.
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