In this study, five mixed substrates -SSFGF, FSSGF, FSSFF, FSSFG, and FSFGF -consisting of fly ash, sludge, soil, fine cinder, gravels, and fine sand, were made in order to test the removal effect of lead. Multiple comparisons and analysis of variance were used to analyze physicochemical properties and the removal efficiency of lead. The test results showed that for five substrates, the effluent concentrations were not significantly different among 10 mg/L and 40 mg/L initial concentrations. For the other three initial concentrations (20 mg/L, 80 mg/L and 160 mg/L) from five substrates, it was significantly different. Moreover, when decomposition time was 0.25 h~48 h, the removal efficiency of Pb from the solution was better for substrate SSFGF-based wetland than those of the other substrate-based wetlands at low and medium initial concentrations (10 mg/L, 20 mg/L, 40 mg/L, and 80 mg/L), and then it was slightly better for substrate FSSFF-based wetland. At relatively high initial concentrations (160 mg/L), the removal efficiency was better for substrate FSSFF-based wetland than those of the other substrate-based wetlands, and then it was slightly better for substrate SSGFF-based wetland. Our study further suggested that SSFGF and FSSFF were the two relatively ideal substrate materials suitable for removal of Pb from a constructed wetland system.

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Key indicators: single-crystal X-ray study; T = 273 K; mean (C-C) = 0.003 Å; R factor = 0.046; wR factor = 0.120; data-to-parameter ratio = 13.7.The title complex, C 26 H 24 N 2 O 2 , was synthesized by the reaction of 1-naphthaldehyde with 1,4-bis(aminooxy)butane in ethanol. The molecule has crystallographic inversion symmetry. The intermolecular distance between the nearest naphthalene rings is 3.141 (2) Å , indicating a strong intermolecularstacking interaction.

Key indicators: single-crystal X-ray study; T = 298 K; mean (C-C) = 0.004 Å; R factor = 0.058; wR factor = 0.175; data-to-parameter ratio = 14.4.The title bisoxime compound, C 19 H 22 N 2 O 2 , synthesized by the reaction of 4-methyl-2-hydroxybenzaldehyde with 1,3-bis-(aminooxy)propane in ethanol, adopts a V-shaped conformation. The dihedral angle between the rings is 84.59 (3) . The molecule is disposed about a crystallographic twofold rotation axis, with one C atom lying on the axis. In the crystal, molecules are packed by C-HÁ Á Á (Ph) interactions, forming chains. Related literature

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The mol­ecule of the title compound, C25H34N2O6, adopts a fully extended configuration. The oxime (—CH=N—O—) group is coplanar with the aromatic ring and the two benzene rings are almost parallel, making a dihedral angle of 0.16 (3)°. In the crystal structure, strong intra­molecular O—H⋯N hydrogen bonds generate six-membered S(6) ring motifs. Inter­molecular C—H⋯O hydrogen bonds link each mol­ecule to five others, forming an infinite three-dimensional supra­molecular structure. The crystal is further stabilized by π–π stacking inter­actions between neighbouring benzene rings [centroid–centroid distance = 3.744 (2) Å].

In the title compound, C26H24N4O2, the dihedral angles between the central pyrazole ring and the other three benzene rings are 40.02 (3), 77.51 (5) and 55.72 (3)°. A strong intra­molecular N—H⋯O hydrogen bond forms a six-membered ring with an S(6) motif. In the crystal structure, a weak inter­molecular C—H⋯N inter­action with graph-set motif R 2 2(8) and C—H⋯O hydrogen bonds link each mol­ecule to three others, forming an infinite two-dimensional supra­molecular structure.