Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
Not a member yet
3266 research outputs found
Sort by
Expression of Vitreoscilla hemoglobin enhances production of arachidonic acid and lipids in Mortierella alpina
No full textBackground: Arachidonic acid (ARA, C20:4, n-6), which belongs to the omega-6 series of polyunsaturated fatty acids and has a variety of biological activities, is commercially produced in Mortierella alpina. Dissolved oxygen or oxygen utilization efficiency is a critical factor for Mortierella alpina growth and arachidonic acid production in large-scale fermentation. Overexpression of the Vitreoscilla hemoglobin gene is thought to significantly increase the oxygen utilization efficiency of the cells
Fluorene Side-Chained Benzodithiophene Polymers for Low Energy Loss Solar Cells
No full textHere we design and synthesize one novel fluorene side-chained benzodithiophene (BDT) monomer for polymer solar cells (PSCs) donor. By copolymerizing this monomer with 4,7-di(thiophen-2-yl)-2,1,3-benzothiadiazole (DTBT) or 4,7-di(4-(2ethylhexyl)-2-thienyl)-5,6-difluoro-2,1,3-benzothiadiazole (DTffBT), two donor acceptor (D-A) conjugated polymers PFBDT-DTBT and PFBDT-DTffBT are prepared. PSCs are prepared with these polymers as donor and PC71BM as acceptor. The maximum power conversion efficiency (PCE) of the two polymers PFBDT-DTBT and PFBDT-DTffBT based PSCs is 7.13% (V-OC = 0.90 V, J(SC) = 13.26 mA cm(-2), and FF = 0.598) and 7.33% (V-OC = 0.96 V, J(SC) = 13.24 mA cm(-2), and FF = 0.577). The UV-vis absorption and electrochemical cyclic voltammetry test results show that F atoms in DTffBT unit present an obvious influence on intermolecular effect and molecular energy levels of polymers. Furthermore, the energy loss of two PSCs devices in this work is confirmed to be 0.78 and 0.71 eV, lower than most results based on BDT PSCs devices, which is critical to obtain high PCE PSCs devices with a decent trade-off between J(SC) and V-OC
Syngas Production by Biogas Reforming in a Redox-Stable and CO2-Tolerant Oxygen Transporting Membrane Reactor
No full textA novel membrane reactor consisting of Ce0.9Gd0.1O2-delta Gd0.1Sr0.9Fe0.9Ti0.1O3-delta (CGOGSFT) is used to combine air separation with biogas reforming in a single unit. The composite material CGOGSFT was synthesized via a combined EDTAcitrate complexing solgel method. Characterization with XRD, SEM, and EDXS revealed that the composite material was a two-phase fluoriteperovskite system with good compatibility and a homogeneous percolative network. XRD demonstrated that the CGOGSFT membrane shows a good phase stability not only in CO2 but also in simulated biogas atmosphere. Under the gradient of air/simulated biogas, the oxygen permeability and methane conversion was increased by either raising the operating temperature or increasing the CO2 concentration. At 890 degrees C and a CH4/CO2 molar ratio of 1.5, an oxygen permeation flux of 1.1 cm(3) min(1) cm(2) through the CGOGSFT membrane was achieved while methane conversion reached 83%, and remained stable for nearly 150 h before the measurement was intentionally stopped
Tunable and selective hydrogenation of furfural to furfuryl alcohol and cyclopentanone over Pt supported on biomass-derived porous heteroatom doped carbon
No full textThe search for and exploitation of efficient catalytic systems for selective conversion of furfural into various high value-added chemicals remains a huge challenge for green synthesis in the chemical industry. Here, novel Pt nanoparticles supported on bamboo shoot-derived porous heteroatom doped carbon materials were designed as highly active catalysts for controlled hydrogenation of furfural in aqueous media. The porous heteroatom doped carbon supported Pt catalysts were endowed with a large surface area with a hierarchical porous structure, a high content of nitrogen and oxygen functionalities, a high dispersion of the Pt nanoparticles, good water dispersibility and reaction stability. Benefiting from these features, the novel Pt catalysts displayed a high activity and controlled tunable selectivity for furfural hydrogenation to produce furfuryl alcohol and cyclopentanone in water. The product selectivity could be easily modulated by controlling the carbonization temperature of the porous heteroatom doped carbon support and the reaction conditions (temperature and H-2 pressure). Under mild conditions (100 degrees C, 1 MPa H-2), furfuryl alcohol was obtained in water with complete conversion of the furfural and an impressive furfuryl alcohol selectivity of > 99% in the presence of Pt/NC-BS-500. A higher reaction temperature, in water, favored rearrangement of the furfural (FFA) with Pt/NC-BS-800 as the catalyst, which resulted in a high cyclopentanone yield of > 76% at 150 degrees C and 3 MPa H-2. The surface properties and pore structure of the heteroatom doped carbon support, adjusted using the carbonization temperature, might determine the interactions between the Pt nanoparticles, carbon support and catalytic reactants in water, which in turn could have led to a good selectivity control. The effect of different reaction temperatures and reaction times on the product selectivity was also explored. Combined with exploration of the distribution of the reaction products, a reaction mechanism for furfural reduction has been proposed
Biofilm based attached cultivation technology for microalgal biorefineries-A review
No full textThe attached cultivation for microalga has many superiorities over the conventional aqua-suspend methods, which make it a promising pathway to supply feedstock for microalgae based bio-refinery attempts. In this review, the current reports on bioreactor, application, modeling, substratum material and engineering aspects were summarized and the future research and developments should be focused on the following aspects: 1) Build principles and guidelines for rational structure design by studying the relationship of physiological properties with typical structures and light regimes; 2) Set up theory foundation of substratum material selection by studying the physic-chemical properties of algal cells and substratum materials; 3) Further understanding the mass transfer behaviors of both CO2 and nutrients in biofilm for enhanced growth rate and products accumulation; 4) New equipment and machines for inoculation, harvesting and moisture keeping should be developed and integrated with bioreactor structure. (c) 2017 Elsevier Ltd. All rights reserved
Color and alcohol removal for the simultaneous detection of amino acids and sugars in wine by two-dimensional ion chromatography
No full textAn effective pretreatment method for wine color removal by a PS-DVB SPE cartridge and online alcohol elimination by valve switching was presented. The optimum parameters for color removal were investigated: 40-mu m and 100 angstrom poly (styrene)-divinylbenzene (PS-DVB) (0.4 g) was selected as the color removal material and 5 mL of ethanol (10%) as the elution solvent for sample pretreatment under given condition. Moreover, an accurate and automated two-dimensional ion chromatography method for the simultaneous detection of amino acids and sugars was achieved with two valves after injection without alcohol interference. The method had a mean correlation coefficient of > 0.99 and a repeatability of 0.92%-4.30% for eight replicates. The mean recovery of six red wine samples were 97.6%, 96.6%, 96.1%, 95.9%, 97.3% and 96.4% respectively. And this method successfully analyzed the amino acid and sugar contents of six wine samples of different origins
Visible-light-driven Ag-decorated g-C3N4/Bi2WO6 Z-scheme composite for high photocatalytic activity
No full textA novel Z-scheme Ag-decorated g-C3N4/B2WO6 composite is successfully synthesized by introducing Ag NPs on the interface of g-C3N4/Bi2WO6 composite. The Ag-decorated g-C3N4/Bi2WO6 sample exhibits much higher photocatalytic activity than g-C3N4/Bi2WO6 composite on the degradation of Rhodamine B under visible light. The significantly enhanced catalytic efficiency could be attributed to the Z-cheme transfer mechanism of photogenerated electron-hole pairs, which was confirmed by investigating the morphology, structure, optical properties and photocatalytic activities. (C) 2017 Elsevier B.V. All rights reserved
Fabrication of recyclable carbonized asphalt-melamine sponges with high oil-absorption capability
No full textBACKGROUND: Selective absorption of oils by macroporous solid absorbents has been regarded as an easy, environment-friendly and economical way to gather oils for oil-water separation, oil contamination cleanup and easy transport/storage. Cheap absorbent material with high oil-absorption performance is a key factor to promote its large-scale application
Effects of global transcription factor NtcA on photosynthetic production of ethylene in recombinant Synechocystis sp PCC 6803
No full textBackground: Cyanobacteria are considered potential photosynthetic microbial cell factories for biofuel and biochemical production. Ethylene, one of the most important organic chemicals, has been successfully synthesized in cyanobacteria by introducing an exogenous ethylene-forming enzyme (Efe). However, it remains challenging to significantly improve the biosynthetic efficiency of cyanobacterial ethylene. Genetic modification of transcription factors is a powerful strategy for reprogramming cellular metabolism toward target products. In cyanobacteria, nitrogen control A (NtcA), an important global transcription regulator of primary carbon/nitrogen metabolism, is expected to play a crucial role in ethylene biosynthesis
The behavior of hydroxide and hydronium ions at the hexadecane-water interface studied with second harmonic generation and zeta potential measurements
No full textBy probing the electric potential at the hexadecane-water interface with second harmonic generation and the zeta potential at the surface of a hexadecane droplet in its emulsion, we show that hydronium ions don't have a specific affinity to the oil-water interface although hydroxide ions do. The observed apparent affinity of the hydronium ions to the hexadecane-water interface is more likely a result of the electro-static attraction effect. The adsorption free energy of the hydroxide ions at the oil-water interface was estimated to be -8.3 kcal mol(-1). This study provides more experimental evidence for understanding the behavior of hydronium and hydoxide ions at the oil-water interface