Ocean University of China

About: Ocean University of China is a education organization based out in Qingdao, China. It is known for research contribution in the topics: Population & Sea surface temperature. The organization has 27604 authors who have published 27886 publications receiving 440181 citations. The organization is also known as: Zhōngguó Hǎiyáng Dàxué & OUC.

Photocatalyst of TiO2/ZnO nano composite film: Preparation, characterization, and photodegradation activity of methyl orange

Abstract: The TiO 2 /ZnO nano composite film with atomic ratios of Ti/(Ti + Zn) of 100%, 75%, 50%, 25%, and 0% was successfully prepared via sol–gel process from directly mixing TiO 2 /ZnO sol followed by heat treatment at 500 °C for 2 h in air. The SEM observation and the XRD measurement revealed that the microstructural morphology and the crystallization behavior of the composite film were essentially related to the atomic ratio of Ti/(Ti + Zn). The UV irradiated degradation of MO solution using the composite film as catalyst showed a linear tendency of the photocatalytic activity of the film against the value of Ti/(Ti + Zn). An exception to photocatalytic activity was observed for the film with Ti/(Ti + Zn) of 75%, which has been attributed to the poor crystallization of the film. Heat treatment with 5 h was applied to the film and better crystallization was achieved for the film. Consequently, a substantial improvement of the photocatalytic activity for the film was finally achieved.

Rich sulfur doped porous carbon materials derived from ginkgo leaves for multiple electrochemical energy storage devices

Abstract: A strategy of utilizing biomass in energy applications has been highly sought after due to low cost, renewability and environmental friendliness. In this work, based on the unique multilayered structure of ginkgo leaves, an interconnected carbon nanosheet with rich micro/meso pores has been fabricated using hydrothermal treatment and a KOH activation process. Attractively, due to the intensive reactions between the rich organism components of the ginkgo leaves and sulfuric acid in the preparation process, the highest amount of sulfur doping (8.245 wt%) ever reported has been achieved in the as-obtained biomass derived carbons. Combined with the N doping derived from the proteins in ginkgo leaves, S,N dual-doping porous carbons with an interconnected sheet-like structure demonstrate excellent electrochemical performance in both EDLCs and NIBs. The application in EDLCs in aqueous electrolyte showed a high specific capacitance of 364 F g−1 at 0.5 A g−1 and only 2% capacitance loss after 30 000 cycles. In an ionic liquid electrolyte, the devices were able to deliver an energy density of 16 W h kg−1 at an extremely high power density of 50 kW kg−1. As a sodium-ion battery anode, it has the capacity of 200 mA h g−1 after 500 cycles (99% capacity retention) at 0.2 A g−1, which is superior or at least comparable to those of biomass derived carbons reported recently. Therefore, all these results exhibit the promising potential of the ginkgo leaves-derived carbon for wide applications in the field of energy storage devices.

Acetobacteroides hydrogenigenes gen. nov., sp. nov., an anaerobic hydrogen-producing bacterium in the family Rikenellaceae isolated from a reed swamp.

Abstract: A strictly anaerobic, mesophilic, carbohydrate-fermenting, hydrogen-producing bacterium, designated strain RL-C-T, was isolated from a reed swamp in China. Cells were Gram-stain-negative, catalase-negative, non-spore-forming, non-motile rods measuring 0.7-1.0 mu m in width and 3.0-8.0 mu m in length. The optimum temperature for growth of strain RL-C-T was 37 degrees C (range 25-40 degrees C) and pH 7.0-7.5 (range pH 5.7-8.0). The strain could grow fermentatively on yeast extract, tryptone, arabinose, glucose, galactose, mannose, maltose, lactose, glycogen, pectin and starch. The main end products of glucose fermentation were acetate, H-2 and CO2. Organic acids, alcohols and amino acids were not utilized for growth. Yeast extract was not required for growth; however, it stimulated growth slightly. Nitrate, sulfate, sulfite, thiosulfate, elemental sulfur and Fe(III) nitrilotriacetate were not reduced as terminal electron acceptors. Aesculin was hydrolysed but not gelatin. Indole and H2S were produced from yeast extract. The G+C content of the genomic DNA was 51.2 mol%. The major cellular fatty acids were iso-C-15:0, anteiso-C-(15:0) and C-16:0. The most abundant polar lipid of strain RL-C-T was phosphatidylethanolamine. 16S rRNA gene sequence analysis revealed that the isolate belongs to the uncultured Blvii28 wastewater-sludge group (http://www.arb-silva.de/) in the family Rikenellaceae of the phylum Bacteroidetes, and shared low sequence similarities with the related species Alistipes shahii WAL 8301(T) (81.8 %), Rikenella microfusus ATCC 29728(T) (81.7%) and Anaerocella delicata WN081(T) (80.9 %). On the basis of these data, a novel species in a new genus of the family Rikenellaceae is proposed, Acetobacteroides hydrogenigenes gen. nov., sp. nov. The type strain of the type species is RL-C-T (=JCM 17603(T)=DSM 24657(T)=CGMCC 1.5173(T)).