Dalian University of Technology

About: Dalian University of Technology is a education organization based out in Dalian, China. It is known for research contribution in the topics: Catalysis & Finite element method. The organization has 60890 authors who have published 71921 publications receiving 1188356 citations. The organization is also known as: Dàlián Lǐgōng Dàxué.

Low-temperature synthesis of ZnO nanoparticles by solid-state pyrolytic reaction

Abstract: A new method for the growth of high-quality ZnO nanoparticles is presented here; it is a novel, low-cost, and easy operation. This approach, using solid-state heat decomposition at low temperature, allows one to produce ZnO nanoparticles with relatively high dispersivity. The optical properties of the ZnO nanoparticles have been investigated. It is demonstrated that ZnO nanoparticles show strong ultraviolet emission, while the low-energy visible emission is nearly fully quenched at room temperature. This is a result of the high quality of the ZnO. X-ray diffraction patterns reveal that the ZnO nanoparticles have polycrystalline hexagonal wurtzite structure. The Raman spectrum shows a typical resonant multi-phonon form for the ZnO nanoparticles. Similar synthesis routes for other metal oxide nanoparticles may be possible.

Integration of microfiltration and visible-light-driven photocatalysis on g-C3N4 nanosheet/reduced graphene oxide membrane for enhanced water treatment

Abstract: A graphitic carbon nitride nanosheet/reduced graphene oxide/cellulose acetate composite photocatalytic membrane (g-C3N4 NS/RGO/CA) was fabricated by assembling a g-C3N4 NS/RGO photocatalyst on the surface of commercial CA membrane. Owing to the attractive photocatalytic efficiency of g-C3N4 NS under visible light irradiation and photogenerated charge separation resulting from the unique hetero-structure between g-C3N4 NS and RGO, g-C3N4 NS/RGO/CA composite photocatalytic membranes exhibited superior performance in water treatment under visible light irradiation. The removal efficiency of Rhodamine B by the integrated process of filtration and visible light driven photocatalysis was four times that of membrane filtration alone. The integrated process also displayed efficient inactivation of Escherichia coli at three orders of magnitude higher than that of filtration alone. The permeate flux for the integrated process was 3.7 times that of filtration alone, suggesting its good anti-fouling property under visible light irradiation. The integrated system was employed to treat surface water and evaluate its performance in real water treatment. The integrated process showed much better efficiencies for the removal of CODMn, TOC, UV254, and bacteria from surface water than those of membrane filtration alone. This work gives insight to the effective application of solar energy for the improvement of membrane separation in water treatment.

Highly Active, Bifunctional Co(III)-Salen Catalyst for Alternating Copolymerization of CO2 with Cyclohexene Oxide and Terpolymerization with Aliphatic Epoxides

Abstract: The cobalt(III) complex of a salen ligand bearing one quaternary ammonium salt on the three-position of one aromatic ring is a highly active catalyst for the alternating copolymerization of cyclohexene oxide (CHO) and CO2 to afford the corresponding poly(cyclohexene carbonate) (PCHC) at various temperatures. The cobalt-based catalyst exhibited excellent activity and selectivity for polymer formation at high temperatures up to 120 °C and even under low CO2 pressures of 0.1 MPa. Also, the cobalt(III)-salen complex could operate very efficiently for the terpolymerization of CHO and aliphatic epoxides with CO2 to provide selectively polycarbonates with a narrow polydispersity at high temperatures. The polycarbonates resulting from the terpolymerization of equimolar CHO and propylene oxide (PO) with CO2 have a close content for both cyclohexene carbonate and propylene carbonate units. This is ascribed to the presence of CHO significantly inhibiting the reactivity of PO and thereby causing a matched reactivity ...