A special purple filamentous fungus, TD16, was isolated from the contaminated culture broth of cyanobacteria (chroococcaceae sp). The sequence of the ITS1-5.8S-ITS2 region of its rDNA suggests that ...it belongs to the genus Paecilomyces with the highest homology of 99%. Further phylogenetic analysis (GenBank accession no: JN243772) indicates that the fungus is related more closely to Paecilomyces lilacinus than to other species of Paecilomyces. However, its phialides consist of a very thin neck (diameter less than 0.5 μm), approximately half that of the Paecilomyces lilacinus reported previously. Accordingly, the species is perhaps a variety or subspecies of Paecilomyces lilacinus. Furthermore, this special Paecilomyces secreted polysaccharides composing of galactose only and a lilac water-soluble pigment into the broth.
An exopolysaccharide (EPS)-producing bacterium TD18, isolated from the culture broth of green alga
, was identified as
based on the 100% identity of 16S rRNA sequences and designated
TD18. The ...results of compositional and structural analyses and physiochemical tests show that (1) the exopolysaccharide produced by
TD18 (TD18-EPS) is an acidic hetero-polysaccharide with a molecular weight of 23 kDa, consisting of glucose, mannose, galactose and glucuronic acid, and (2) TD18-EPS is of high thermal stability with a degradation temperature of 308 °C, the solution of which is non-Newtonian pseudoplastic fluid exhibiting good emulsifying properties over a wide range of temperatures, pH and NaCl concentrations. Hence,
TD18 is the first alga-symbiotic
strain identified thus far, while TD18-EPS is unique in terms of composition and structure, different from the known
EPS, with excellent physiochemical properties and thus has potential applications in industry.
To remove nutrients efficiently, mix-cultivation of astaxanthin-producing green alga Haematococcus pluvialis and antibiotic-synthesizing fungus Simplicillium lanosoniveum DT06 (DT06) was conducted in ...unsterilized wastewater without/with addition of NaHCO3. Results showed that (1) in mixed culture at the optimal cell ratio of 30: 1, COD was removed completely, and removal efficiency of TN and TP increased to 83.3% and 88.2% respectively; (2) TN and TP removal efficiency were further promoted to 100% after addition of 0.6 g L–1 NaHCO3 to mixed culture with concurrent increases of algal biomass, lipid and astaxanthin contents to 1.95 g L–1, 0.39 g g–1 and 27.9 mg g–1 respectively. Hence, mix-cultivation of H. pluvialis and DT06 supplemented with NaHCO3 provide a cost-effective strategy for wastewater treatment and biodiesel/astaxanthin production.
•Mix-cultivation of microalgae with antibiotic-synthesizing fungus.•Complete removal of nitrogen and phosphorus by supplementing NaHCO3.•Significant promotion of biomass, lipid and astaxanthin production.
Here, we successfully prepared Ba2Bi3Ta2O11Cl via a simple one-step molten salt method and adjusted its crystal morphology and structure, based on which the O2-evolving activity was significantly ...improved. In addition, W doping promotes the charge separation efficiency, lowers the energy barrier for water oxidation reaction, and thus improves the activity. Finally, the optimized W-doped sample after molten salt treatment shows the best O2 production activity (55 μmol h−1) without loading any cocatalyst, which is 6 times higher than that of pristine Ba2Bi3Ta2O11Cl and 2 times higher than that of the undoped Ba2Bi3Ta2O11Cl treated with molten salt, respectively.
Here, we successfully prepared Ba
2
Bi
3
Ta
2
O
11
Cl
via
a simple one-step molten salt method and adjusted its crystal morphology and structure, based on which the O
2
-evolving activity was ...significantly improved. In addition, W doping promotes the charge separation efficiency, lowers the energy barrier for water oxidation reaction, and thus improves the activity. Finally, the optimized W-doped sample after molten salt treatment shows the best O
2
production activity (55 μmol h
−1
) without loading any cocatalyst, which is 6 times higher than that of pristine Ba
2
Bi
3
Ta
2
O
11
Cl and 2 times higher than that of the undoped Ba
2
Bi
3
Ta
2
O
11
Cl treated with molten salt, respectively.
The O
2
-evolving activity of W-doped and flux-treated Ba
2
Bi
3
Ta
2
O
11
Cl is significantly promoted due to the reduced charge recombination and activation energy.
Here, we successfully prepared Ba
Bi
Ta
O
Cl
a simple one-step molten salt method and adjusted its crystal morphology and structure, based on which the O
-evolving activity was significantly ...improved. In addition, W doping promotes the charge separation efficiency, lowers the energy barrier for water oxidation reaction, and thus improves the activity. Finally, the optimized W-doped sample after molten salt treatment shows the best O
production activity (55 μmol h
) without loading any cocatalyst, which is 6 times higher than that of pristine Ba
Bi
Ta
O
Cl and 2 times higher than that of the undoped Ba
Bi
Ta
O
Cl treated with molten salt, respectively.
WO.sub.x has good performance in olefin epoxidation, however, the presence of a large amount of Brönsted acid on WO.sub.x affects the selectivity of epoxy products. In this paper, broken carbon ...spheres (b-C spheres) treated with nitric acid were used as support to anchor WO.sub.x in dynamic solvothermal process. Based on GC-MS and GC-IR detection, the obtained WO.sub.x/C greatly increased selectivity of 1,2-epoxyhexane from 16.0% (pure WO.sub.x) to 92.1% in epoxidation of 1-hexene. The improvement of WO.sub.x performance is attributed to the reduction of Brönsted acid sites and electron cloud density after loading, which may all result from interaction between WO.sub.x and oxygen-containing functional groups of b-C spheres. Above changes not only effectively inhibit the hydrolysis of 1,2-epoxyhexane, but also are conducive to nucleophilic reaction of H.sub.2O.sub.2 to WO.sub.x, which is beneficial to the activation of H.sub.2O.sub.2. Finally, an epoxidation mechanism with oxygen vacancies as the main route under WO.sub.x/C catalysis is reasonably proposed.
Linear terminal olefin epoxidation is an important oxidation reaction that provides valuable chemical intermediates. Heterogeneous catalytic epoxidation with O 2 is a “dream reaction”, although it is ...still far from commercialization. In this study, bowl-shaped γ-Al 2 O 3 (153 m 2 g −1 )-supported 1 wt% silver catalysts were obtained by the ammonia-evaporation method and subsequent calcination at 250–450 °C. Their catalytic liquid-phase epoxidation of 1-hexene with O 2 performance was then studied. It was found that the initiator (TBHP) promotes selective oxidation and the 1,2-epoxyhexane is the major product (yield 6.08%), whereas excess dosage (0.8 mmol) and extra O 2 partial pressure (0.5 MPa) led to an increase in further oxidation products, such as 1-hydroxyhexan-2-one. Considering the different chemical states of silver, the calcination temperature did not significantly affect the structural properties (specific surface area of ∼160 m 2 g −1 , pore volume of 0.37 cm 3 g −1 ) or Ag particle size (10–20 nm), so the variation in the catalytic epoxidation performance was therefore attributed to the oxidized silver content. Further, it was speculated that oxidized silver readily activates the CC bond and further dissociates and adsorbs oxygen to promote the selective oxidation of the reaction.
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