Adsorption of methyl orange and methylene blue from aqueous solutions on pure bentonite: statistical physical modeling provides an analytical interpretation.

This study investigates the adsorption of methylene blue (MB) and methyl orange (MO) dyes from aqueous solutions using purified Moroccan bentonite, being mainly composed of silica and alumina, in the form of quartz and cristobalite. The temperature controls the adsorption capacity for the kinetics, increasing 5.08% (from 295.

Crystal structure of 1,5-diethyl-1H-1,5-benzodiazepine-2,4(3H,5H)-di-thione.

In the title compound, C13H16N2S2, the seven-membered ring adopts a boat conformation, with the two phenyl-ene C atoms representing the stern and the methyl-ene C atom as the prow. The thione S atoms and N-bound ethyl groups lie on the opposite side of the mol-ecule to the phenyl-ene ring so that the mol-ecule approximates mirror symmetry. In the crystal, supra-molecular layers in the bc plane are sustained by a pair of C-H⋯S inter-actions to the same S atom acceptor.