The presence of nitrophenols in wastewater is of great environmental concern. In this paper, mesoporous silicate MCM-41 has been prepared by the hydrothermal method and characterized by XRD, the nitrogen adsorption isotherm, and elemental analysis. Adsorption behaviors of 2,4,6-trinitrophenol (picric acid) on the calcined and uncalcined mesoporous MCM-41 adsorbents were studied. The experimental adsorption isotherm was successfully described by the Langmuir model. The pH effect, adsorption kinetics, and breakthrough curves were studied by batch and column methods. The adsorption capacity of picric acid varied significantly with the pH of the solution. It was found that the adsorption capacity is very high in the pH range of 1.4−4.0 and adsorption decreases with increasing pH value.

An efficient and green procedure has been developed for the synthesis of 1,8-dioxo-octahydroxanthenes derivatives. The reaction was carried out in water under ultrasound irradiation, using nanosized MCM-41-SO(3)H. In this method, several types of aromatic aldehyde, containing electron-withdrawing groups as well as electron-donating groups, were rapidly converted to the corresponding 1,8-dioxo-octahydroxanthenes in good to excellent yields. This novel synthetic method is especially favored because it provides a synergy of the nanosized MCM-41-SO(3)H and ultrasound irradiation which offers the advantages of high yields, short reaction times, simplicity and easy workup compared to the conventional methods reported in the literature.

No abstract

MCM-41-SO 3 H, ordered mesoporous silica material MCM-41 with covalently anchored sulfonic acid groups located inside the mesochannels, was used as an acid catalyst for the rapid and 'green' synthesis of 2,3-dihydroquinazolin-4(1H)-one derivatives under solvent-free condition. This novel synthetic method offers several advantages, such as excellent yields, simple procedure, short reaction times, and mild reaction conditions.

No abstract

No abstract

No abstract

No abstract