The catalytic application of a novel ionic liquid and sulfonic acid based bifunctional periodic mesoporous organosilica (BPMO–IL–SO3H) in the one‐pot Biginelli reaction was developed. The BPMO–IL–SO3H catalyst was first prepared by hydrolysis and co‐condensation of tetramethoxysilane, 1,3‐bis(trimethoxysilylpropyl)‐imidazolium iodide and 3‐mercaptopropyl‐trimethoxysilane in the presence of surfactant template under acidic conditions followed by oxidation of SH groups in the presence of hydrogen peroxide. This catalyst was then characterized by thermal gravimetric analysis, transmission electron microscopy, small‐angle powder X‐ray diffraction, and nitrogen sorption analysis. The performance of the BPMO–IL–SO3H catalyst was investigated in the Biginelli condensation of a variety of different aldehydes with alkylacetoacetates and urea under solvent‐free conditions. The catalyst exhibited excellent activity and delivered corresponding Biginelli products in high to excellent yields and selectivities. Moreover, the reactivity, reusability, and stability of the BPMO–IL–SO3H were also investigated under the applied reaction conditions. Our study showed that the catalyst could be recovered and reused at least 10 times without any significant decrease in efficiency.

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The efficiency of a novel ionic liquid based nanoporous organosilica supported propylamine (ILNO-NH 2 ) in the removal of Pb(II) and Co(II) ions from aqueous solution and industrial wastewater has been investigated. The effect of contact time, adsorbent dose, solution pH and concentration of metal ions in batch systems was studied in the adsorption of Pb(II) and Co(II) ions onto ILNO-NH 2 . The results indicated that adsorption process was strongly affected by pH and temperature. The experimental data were analyzed using the Langmuir, Freundlich and Temkin isotherm models. Correlation coefficients were determined by analyzing each isotherm. It was found that the Langmuir isotherm showed better correlation with the experimental data than the Freundlich and Temkin ones. According to the parameters of the Langmuir isotherm, the maximum adsorption capacity of ILNO-NH 2 for Pb(II) and Co(II) was found to be 22.27 and 5.20 mg/g, respectively. The kinetics study also showed that the overall adsorption process was successfully fitted with the pseudo-second-order kinetic model.