Impacts of operational parameters on the morphological structure and uranium bioleaching performance of bio-ore pellets in one-step bioleaching by Aspergillus niger

2020 ◽  
Vol 195 ◽  
pp. 105378
Author(s):  
Jing Sun ◽  
Guangyue Li ◽  
Qian Li ◽  
Yongdong Wang ◽  
Jianhong Ma ◽  
...  
Keyword(s):  
Aspergillus Niger ◽  
Morphological Structure ◽  
Operational Parameters ◽  
Ore Pellets ◽  
Uranium Bioleaching ◽  
One Step

The Effect of Operational Parameters on the Photocatalytic Mineralization of Indocorn Brilliant Red M5B Using Sol–gel Derived Nanostructured Zinc Titanate as an Efficient Photocatalyst

2012 ◽  
Vol 15 (2) ◽  
Author(s):  
Mohammad Hossein Habibi ◽  
Maryam Mikhak
Keyword(s):  
Azo Dye ◽  
Sol Gel ◽  
Degradation Efficiency ◽  
High Yield ◽  
Operational Parameters ◽  
Solution Ph ◽  
Zinc Titanate ◽  
First Order Kinetics ◽  
Size Uniformity ◽  
One Step

AbstractNanostructured zinc titanate (NZT) was synthesized in high yield via a one-step and template-free sol-gel route. The prepared nanocomposite exhibited good size uniformity and regularity. The enhanced photocatalytic activity of the NZT was evaluated in the degradation and mineralization of Indocorn Brilliant Red (M5B) under metal halide lamp irradiation. The effects of different parameters such as pH of the solution, and initial dye concentration on photodegradation of M5B were analyzed. The degradation of M5B follows pseudo-first order kinetics according to the Langmuir-Hinshelwood model. The experimental results showed that the initial concentration of azo dye in the dye mixture greatly affected the degradation efficiency. At M5B concentrations of 10 mg/L, the optimum conditions for the highest degradation efficiency (94%) of azo dye were a photocatalyst dosage of 0.01 g/L and an initial solution pH of 9. This study provided new insight into the design and preparation of nanomaterial demonstrated an excellent ability to remove organic pollutants in wastewater.

scholarly journals Tuning the Morphological Structure and Photocatalytic Activity of Nitrogen-Doped (BiO)2CO3by the Hydrothermal Temperature

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Chongjun Wang ◽  
Zaiwang Zhao ◽  
Bin Luo ◽  
Min Fu ◽  
Fan Dong
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Light Absorption ◽  
Photocatalytic Performance ◽  
Morphological Structure ◽  
Hydrothermal Temperature ◽  
Nitrogen Doped ◽  
Light Region ◽  
Efficient Performance ◽  
One Step

Various nitrogen-doped hierarchical (BiO)2CO3nanosheets architectures were synthesized by a facile one-step template-free hydrothermal method through controlling the hydrothermal temperature (HT). The as-synthesized samples were characterized by XRD, SEM, FT-IR, XPS, and UV-vis DRS. The photocatalytic activity of the samples was evaluated towards degradation of NO at ppb level in air under visible light (VIL). It was found that HT acted as a crucial factor in determining the morphology of the samples. The rosa chinensis-like, red camellia-like, and lamina-like of nitrogen-doped (BiO)2CO3(N-BOC) micro-/nanostructures can be selectively fabricated under hydrothermal temperatures of 150, 180, and 210°C. The thickness of the nanosheets was in direct proportion to the increasing HT. Nitrogen-doping can extend the light absorption spectra of (BiO)3CO3to visible light region and enhance the VIL photocatalytic activity. Especially, the red camellia-like N-BOC-180 exhibited the highest photocatalytic performance, superior to the well-known VIL-driven photocatalyst C-doped TiO2and N-doped TiO2. The high photocatalytic performance of N-BOC was attributed to the synergetic effects of enhanced visible light absorption, multiple light-reflections between the nanosheets, and accelerated transfer of reactants and product. This research could provide new insights to the development of excellent photocatalyst with efficient performance for pollution control.

scholarly journals Evaluation of operational parameters on the precipitation of endoglucanase and xylanase produced by solid state fermentation of Aspergillus niger

2011 ◽  
Vol 28 (1) ◽  
pp. 17-26 ◽  
Author(s):  
C. S. Farinas ◽  
L. M. Scarpelini ◽  
E. A. Miranda ◽  
V. Bertucci Neto
Keyword(s):  
Solid State ◽  
Aspergillus Niger ◽  
Solid State Fermentation ◽  
Operational Parameters

An Investigation into the Optimum Carbonization Conditions for the Production of Porous Carbon from a Solid Waste

2012 ◽  
Vol 587 ◽  
pp. 88-92 ◽  
Author(s):  
Sara Kazemi Yazdi ◽  
Salman Masoudi Soltani ◽  
Soraya Hosseini
Keyword(s):  
Heating Rate ◽  
Surface Area ◽  
Porous Carbon ◽  
Hold Time ◽  
Bet Surface Area ◽  
Cellulose Derivatives ◽  
Gravimetric Analysis ◽  
Operational Parameters ◽  
One Step ◽  
Adsorption Desorption

Cellulosic materials and cellulose derivatives have been long used in the synthesis of numerous materials. These include various products such as papers, cigarette filters and sanitary pads. Cigarette filters, containing 95% cellulose acetate fibers, are responsible for one of the largest solid wastes generation today. In this work, a simple one-step carbonization of cigarette filters under various operational parameters is used in order to produce porous carbon. The effects of various pyrolysis parameters including carbonization temperature, heating rate and hold time on the final porous carbon product have been investigated. Adsorption-desorption isotherms, scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDX) as well as thermal gravimetric analysis (TGA) have been employed to characterize the pyrolyzed product. The optimum conditions for the production of porous carbon from cigarette filters in relation to its maximum specific surface area (637 m2/g BET surface area) is understood to be at a heating rate of 5 °C/min at 900 °C for 1 hour.

scholarly journals A facile preparation of immobilized naringinase on polyethyleneimine-modified Fe3O4 magnetic nanomaterials with high activity

RSC Advances ◽  
2021 ◽  
Vol 11 (24) ◽  
pp. 14568-14577
Author(s):  
Chan Yu ◽  
Qian Li ◽  
Jing Tian ◽  
Honglei Zhan ◽  
Xinyu Zheng ◽  
...  
Keyword(s):  
Aspergillus Niger ◽  
High Activity ◽  
Fermentation Broth ◽  
Magnetic Nanomaterials ◽  
Precipitation Method ◽  
One Step ◽  
Facile Preparation ◽  
The One ◽  
Co Precipitation

Polyethyleneimine-modified Fe3O4 nanoparticles (Fe3O4-PEI) were synthesized by the one-step co-precipitation method, and the resulting material was used to immobilize naringinase from the fermentation broth of Aspergillus niger FFCC uv-11.

scholarly journals Effect of Different Operational Parameters on Bio-degradation of Chicken Feathers by Aspergillus niger: Investigation Under Submerged Fermentation Process

2020 ◽  
Vol 63 (2) ◽  
pp. 71-76
Author(s):  
Faisal Javeed ◽  
Memuna Ghafoor Shahid ◽  
Ali Javed
Keyword(s):  
Aspergillus Niger ◽  
Yeast Extract ◽  
Substrate Concentration ◽  
Submerged Fermentation ◽  
Fermentation Process ◽  
Incubation Temperature ◽  
Fermentation Medium ◽  
Potential Candidate ◽  
Operational Parameters ◽  
Chicken Feathers

Fungal strain, Aspergillus niger (ATCC 1015) has ability to grow on keratinous material therefore, it was selected for the investigating bio-degradation of chicken feathers. Different operational parameters were studied under submerged fermentation process i.e. effect of substrate concentration, effect of pH, effect of incubation temperature, effect of yeast extract concentration and effect of volume of fermentation medium. A. niger was grown on solid medium of malt extract and agar, due to its ability of rapid growth on it. Complete bio-degradation of the substrate was achieved after 5 days (0.70±0.03 U/mL) under standard optimized conditions. Investigation of different operational parameters on bio-degradation of chicken feathers revealed, maximum keratinolytic was observed at 40 °C incubation temperature, at 0.5 g/100 mL of substrate concentration, 8 g/100 mL concentration of yeast extract, at 7 pH of the fermentation medium and at 50 mL volume of fermentation medium. The present study suggests that A. niger could prove to be a potential candidate for production of keratinase and bio-degradation of chicken feathers.  

scholarly journals Bioorganically doped sol-gel materials containing amyloglucosidase activity

2006 ◽  
pp. 179-186 ◽  
Author(s):  
Beatrice Vlad-Oros ◽  
Monica Dragomirescu ◽  
Gabriela Preda ◽  
Cecilia Savii ◽  
Adrian Chiriac
Keyword(s):  
Enzyme Activity ◽  
Aspergillus Niger ◽  
Immobilized Enzyme ◽  
Sol Gel ◽  
Enzyme Loading ◽  
Molar Ratios ◽  
One Step ◽  
Immobilization Techniques ◽  
Selection Of ◽  
Immobilization Method

Amyloglucosidase (AMG) from Aspergillus niger was encapsulated in various matrices derived from tetraethoxysilane, methyltriethoxysilane, phenyltriethoxysilane and vinyltriacetoxysilane by different methods of immobilization. The immobilized enzyme was prepared by entrapment in two steps, in one-step and entrapment/deposition, respectively. The activities of the immobilized AMG were assayed and compared with that of the native enzyme. The effects of the organosilaneprecursors and their molar ratios, the immobilization method, the inorganic support (white ceramic, red ceramic, purolite, alumina, TiO2, celite, zeolite) and enzyme loading upon the immobilized enzyme activity were tested. The efficiency of the sol-gel biocomposites can be improved through combination of the fundamental immobilization techniques and selection of the precursors.

Fungal Bioleaching of Spent Hydroprocessing Catalyst: Effect of Decoking and Particle Size

2009 ◽  
Vol 71-73 ◽  
pp. 665-668 ◽  
Author(s):  
M. Islam ◽  
Yen Peng Ting
Keyword(s):  
Heavy Metals ◽  
Particle Size ◽  
Aspergillus Niger ◽  
Chemical Analysis ◽  
Fungal Growth ◽  
Spent Catalyst ◽  
Edx Analysis ◽  
One Step ◽  
Catalyst Effect ◽  
Leaching Efficiency

. This work reports on the bioleaching of spent NiMo catalyst using Aspergillus niger. As-received and decoked catalysts of various sizes (as-received, 180-120 µm, 120-45 µm and <45 µm) were examined. Chemical analysis of the spent catalyst confirmed the presence of heavy metals including Al (38.2%), Ni (3.36%), and Mo (12.9%). SEM-EDX analysis revealed a change in the metal distribution within the spent catalyst following the decoking process. In one-step bioleaching where the fungus was inoculated together with the catalyst, fungal growth was not observed. In 2-step bioleaching where the catalyst was added three days after the start of the fungal incubation, the highest Mo (87.3%) and Al (17.20%) leaching efficiencies were obtained from the catalyst of smallest particle size (i.e. decoked grounded; <45µm) while the highest Ni leaching efficiency (94%) was achieved from the as-received spent catalyst.

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