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The main purpose of this study was to characterize the adsorption behavior of naphthalene, one of polycyclic aromatic hydrocarbons (PAHs), on silk fabric. Typical batch reactors were used to perform adsorption kinetics and isotherm experiments. It was found in this study that the pseudo-second-order model described the sorption kinetics data well. An adsorption isotherm in the form of Linear Equation was observed, and the adsorbed capacity was influenced evidently by the enhanced temperature. In addition, the results demonstrated that silk fabric could adsorb large amounts of naphthalene from water, and the maximum exceeded 700 μg/g.

In the centrosymmetric title compound, 2C4H12NO+·C8H4O42−, two N,N-diethyl(hydroxy)ammonium cations are linked to a benzene-1,4-dicarboxylate dianion by a combination of O—H...O and N—H...O hydrogen bonds, which can be described in graph-set terminology as R22(7). The crystal structure is further stabilized by C—H...O hydrogen bonds, leading to the fomation of a ribbon-like network.

In the title compound, C11H14N4O4, doxofylline [7-(1,3-di­oxolan-2-ylmeth­yl)-3,7-dihydro-1,3-dimethyl-1H-purine-2,6-dione] mol­ecules are linked by C—H⋯N hydrogen bonds to form weakly hydrogen-bonded dimers, which are further linked by C—H⋯O hydrogen bonds to form a three-dimensional network.

In the title molecular compound, C4H12NO+·C8H5O4−, the N,N-diethyl(hydroxy)ammonium cation (DTHA) is linked to the 3-carboxybenzoate anion (HBDL) by O—H...O and N—H...O hydrogen bonds with a graph-set motif R22(7). In the crystal, helical chains are formed by O—H...O hydrogen bonds, propagating along [010]. The crystal structure is further stabilized by π–π interactions between inversion-related HBDL benzene rings [centroid–centroid distance = 3.900 (4) Å] and C—H...O interactions.