Guangxi Han

Sonocatalytic degradation of organic dyes and comparison of catalytic activities of CeO2/TiO2, SnO2/TiO2 and ZrO2/TiO2 composites under ultrasonic irradiation

The CeO(2)/TiO(2), SnO(2)/TiO(2) and ZrO(2)/TiO(2) composites were prepared by dispersing various nano-sized oxides (CeO(2), SnO(2), ZrO(2) and TiO(2)) with ultrasound and mixing TiO(2) with CeO(2), SnO(2) and ZrO(2), respectively, in boiling water in a molar ratio of 4:1, followed by calcining temperature 500 degrees C for 60 min. Then a series of sonocatalytic degradation experiments were carried out under ultrasonic irradiation in the presence of CeO(2)/TiO(2), SnO(2)/TiO(2) and ZrO(2)/TiO(2) composites and nano-sized TiO(2) powder. Also, the influences of heat-treatment temperature and heat-treatment time on the sonocatalytic activities of CeO(2)/TiO(2), SnO(2)/TiO(2) and ZrO(2)/TiO(2) composites, and of irradiation time and solution acidity on the sonocatalytic degradation of Acid Red B were investigated by UV-vis spectra. It was found that the sonocatalytic degradation of Acid Red B shows significant variation in rate and ratio that decreases in order: CeO(2)/TiO(2)>SnO(2)/TiO(2)>TiO(2)>ZrO(2)/TiO(2)>SnO(2)>CeO(2)>ZrO(2), and the corresponding ratios of Acid Red B in aqueous solution are 91.32%, 67.41%, 65.26%, 41.67%, 28.34%, 26.75% and 23.33%, respectively. And that the degradation ratio is only 16.67% under onefold ultrasonic irradiation. Because of the good degradation efficiency, this method may be an advisable choice for the treatment of non- or low-transparent wastewaters in the future.

Investigation on solar photocatalytic degradation of various dyes in the presence of Er3+:YALO3/ZnO-TiO2 composite.

In this work, Er(3+):YAlO(3)/ZnO-TiO(2) and ZnO-TiO(2) composites were prepared by the ultrasonic dispersion and liquid boiling method. In succession, they were then characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Acid red B as a model dye compound was degraded under solar light irradiation to evaluate the photocatalytic activities of the Er(3+):YAlO(3)/ZnO-TiO(2) and ZnO-TiO(2) composites. We found that the photocatalytic activity of ZnO-TiO(2) composite can be enhanced by adding an appropriate amount of Er(3+):YAlO(3). We reviewed influencing factors, such as Er(3+):YAlO(3) content, heat-treated temperature and heat-treated time on the photocatalytic activity of the Er(3+):YAlO(3)/ZnO-TiO(2) composites. In addition, the effects of solar light irradiation time, dye initial concentration, Er(3+):YAlO(3)/ZnO-TiO(2) amount and solution acidity on the photocatalytic degradation of acid red B dye in aqueous solution were investigated in detail. Simultaneously, the degradation and comparison of other dyes such as methyl orange (MO), rhodamine B (RM-B), azo fuchsine (AF), congo red (CG-R) and methyl blue (MB) were also reviewed. In addition, we attempted to explore both the principle of possible excitation of Er(3+):YAlO(3)/ZnO-TiO(2) under solar light irradiation and the mechanism of photocatalytic degradation.

Assisted sonodynamic damage of bovine serum albumin by metronidazole under ultrasonic irradiation combined with photosensitive antitumor drug-Amsacrine.

By research, it was found that the Amsacrine (AMSA) can interact with bovine serum albumin (BSA). In this work, the AMSA was adopted as a sonosensitizer and the Metronidazole (MET) was used as a sensitizer to further damage BSA molecules under ultrasonic irradiation. It could be concluded that the damage degree of BSA molecules in the presence of AMSA and MET was more serious than in the presence of pure AMSA. That is, MET could aggravate the damage to BSA molecules under ultrasonic irradiation combined with AMSA. Meanwhile, the damage degree of BSA molecules was also influenced by some factors, such as ultrasonic irradiation time, MET concentration and solution acidity. In addition, the damage site of BSA molecules was estimated by synchronous fluorescence spectra. It was found that the tyrosine (Tyr) and tryptophan (Typ) residues were damaged almost averagely. Perhaps, these research results are of great significance for driving sonodynamic method to treat tumor in clinic application.

Preparation of nano-sized mixed crystal TiO2-coated Er3+:YAlO3 by sol-gel method for photocatalytic degradation of organic dyes under visible light irradiation.

In this work, an upconversion luminescence agent, crystallized Er(3 + ):YAlO(3), was synthesized and then coated by the nano-sized TiO(2) film through sol-gel technique. A novel TiO(2) photocatalyst, Er(3 + ):YAlO(3)/TiO(2), with high activity in visible light was subsequently prepared. The Er(3 + ):YAlO(3) and Er(3 + ):YAlO(3)/TiO(2) were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM). The photocatalytic activity of Er(3 + ):YAlO(3)/TiO(2) photocatalyst was tested by the degradation of acid red B in aqueous solution as the primary model compound under visible light irradiation. The experimental results proved that the prepared TiO(2)-coated crystallized Er(3 + ):YAlO(3) was able to decompose the acid red B efficiently, and it is promising to use the idea to develop new TiO(2) photocatalyst with high activity for photocatalytic degradation under visible light.

Mononuclear nine-coordinate Na[SmIII(edta)(H2O)3] · 5H2O and one dimensional unlimited ladderlike eight-coordinate {[SmIII(Hpdta)(H2O)] · 2H2}On Complexes: Synthesis and Structural Determination

The Na[SmIII(edta)(H2O)3] · 5H2O (H4edta = ethylenediamine-N,N,N′,N′-tetraacetic acid) and {[SmIII(Hpdta)(H2O)] · 2H2O}n (H4pdta = propylenediamine-N,N,N′,N′-tetraacetic acid) complexes were prepared with heat-refluxing and acidity-adjusting methods, respectively. And their composition and structures were determined by elemental analyses and single-crystal X-ray diffraction techniques. The Na[SmIII(edta)(H2O)3] · 5H2O complex shapes a mononuclear structure, and crystallizes in the orthorhombic crystal system with space group Fdd2. The central SmIII ion is nine-coordinated by one hexadentate edta ligand and three water molecules. The crystal data are as follows: a = 19.139(10) Å, b = 35.00(2) Å, c = 11.928(10) Å, V = 7989(9) Å3, Z = 16, Dc = 2.014 g/cm3, μ = 3.046 mm−1, F(000) = 4848, R = 0.0439, and wR = 0.0941 for 3434 observed reflections with I ≥ 2σ(I). The SmN2O7 part in [SmIII(edta)(H2O)3]− complex anion forms a pseudo-monocapped square antiprismatic polyhedron. The {[SmIII(Hpdta)(H2O)] · 2H2O}n complex is prepared with protonated pdta ligand firstly, which forms one dimensional unlimited ladderlike eight-coordinated structure, and crystallizes in the monoclinic crystal system with space group P21/n. The central SmIII ion, in one construction unit, is coordinated by two nitrogen atoms from one hexadentate pdta ligand and six oxygens from the same pdta ligand, one water molecule and one carboxylic group of neighbour pdta ligand, respectively. The crystal data are as follows: a = 12.720(3) Å, b = 9.3800(19) Å, c = 14.420(3) Å, β = 96.11(3)°, V = 1710.7(6) Å3, Z = 2, Dc = 1.971 g/cm3, μ = 3.492 mm−1, F(000) = 1004, R = 0.0225 and wR = 0.0607 for 3182 observed reflections with I ≥ 2σ(I). Otherwise, each part of SmN2O6 in {[SmIII(Hpdta)(H2O)] · 2H2O} complex segment adopts a pseudo-square antiprismatic polyhedron.

Mononuclear eight-coordinate (NH4)3[YIII(Nta)2] and one-dimensional unlimited zigzag type nine-coordinate {K[YIII(Egta) · 4H2O}n complexes: Syntheses and structural determination

AbstractThe title complexes (NH4)3[YIII(Nta)2] (I) (H3Nta = nitrilotriacetic acid) and {K[YIII(Egta)] · 4H2O}n (II) (H4Egta = ethyleneglycol-bis-(2-aminoethylether)-N,N,N′,N′-tetraacetic acid) were prepared, and their molecular and crystal structures were determined by single-crystal X-ray diffraction techniques. Complex I crystallizes in the rhombohedral crystal system with R

Hydrothermal synthesis and structural characterization of a new coordination polymer [In(Pdc)(OH)(2,2′-Bipy)]n(H2Pdc = 3,5-pyridinedicarboxylic acid, 2,2′-bipyridine)

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Nine-coordinate dinuclear Na6[Gd2III(Ttha)2] · 8H2O and mononuclear (H2En)3[GdIII(Ttha)]2 · 11H2O complexes: Synthesis and structural determination

c space group. The central Y3+ ion is eight-coordinated by two nitrogen and six oxygen atoms, which come from two tetradentate Nta ligands. The crystal data are as follows: a = 7.9340(14) Å, c = 54.611(15) Å, V = 2977.1(11) Å3, Z = 6, ρcalcd = 1.738 mg/cm3, μ = 3.011 mm−1, F(000) = 1596, R = 0.0234 and wR = 0.0641 for 686 observed reflections with I ≥ 2σ(I). The {K[YIII(Egta)] · 4H2O}n is nine-coordinated by two nitrogen and seven oxygen atoms and produces a 1D unlimited zigzag-type chain through a bridging carboxylic group. {K[YIII(Egta)] · 4H2O}n crystallizes in the monoclinic crystal system with C2/c space group. The crystal data are as follows: a = 37.588(5) Å, b = 13.7101(19) Å, c = 8.6070(12) Å, β = 99.929(2)°, V = 4369.0(11) Å3, Z = 8, ρcalcd = 1.753 mg/cm3, μ = 2.934 mm−1, F(000) = 2368, R = 0.0385 and wR = 0.0800 for 4082 observed reflections with I ≥ 2σ(I).