Synthesis of nano–silica and biogenic iron (oxyhydr)oxides composites mediated by iron oxidizing bacteria to remove antimonite and antimonate from aqueous solution: Performance and mechanisms

2021 ◽  
pp. 126821
Author(s):  
Rui Xu ◽  
Qian Li ◽  
Xiaolong Nan ◽  
Yongbin Yang ◽  
Bin Xu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Nano Silica ◽  
Iron Oxidizing Bacteria ◽  
Biogenic Iron

Biogenic iron oxides produced by neutrophilic iron-oxidizing bacteria under laboratory conditions

2013 ◽  
Vol 24 ◽  
pp. S108-S109 ◽  
Author(s):  
Ralitza Angelova ◽  
Lyubomir Slavov ◽  
Mihail Iliev ◽  
Blagoi Blagoev ◽  
Daniela Kovacheva ◽  
...  
Keyword(s):  
Iron Oxides ◽  
Laboratory Conditions ◽  
Iron Oxidizing Bacteria ◽  
Biogenic Iron Oxides ◽  
Biogenic Iron

scholarly journals Biogenic iron compounds: XRD, Mossbauer and FTIR study

2013 ◽  
Vol 11 (2) ◽  
pp. 215-227 ◽  
Author(s):  
Maya Shopska ◽  
Zara Cherkezova-Zheleva ◽  
Daniela Paneva ◽  
Mihail Iliev ◽  
Georgi Kadinov ◽  
...  
Keyword(s):  
Catalyst Support ◽  
X Ray Diffraction ◽  
Freshwater Flow ◽  
Dispersed Particles ◽  
Iron Oxidizing Bacteria ◽  
Physicochemical Methods ◽  
Metabolic Activities ◽  
Biogenic Iron Oxides ◽  
Highly Dispersed Particles ◽  
Biogenic Iron

AbstractMaterials based on biogenic iron oxides, which are a product of the metabolic activities of the neutrophilic iron-oxidizing bacteria (NIOB) from Sphaerotilus-Leptothrix group, were investigated. Natural microbial probes were collected from freshwater flow from Vitosha Mountain (Bulgaria) and cultivated under laboratory conditions in respect to select suitable cultures and conditions (nutrition media) for biomaterial accumulation of biogenic oxides. Samples were studied by physicochemical methods: X-ray diffraction, Mossbauer spectroscopy and IR spectroscopy. Their phase composition and physicochemical properties were obtained. Presence of both amorphous and crystal phase (ultra- and highly dispersed particles) was proved. Iron-containing compound in the natural biomass consists of α-FeOOH. The cultivated materials have more complex composition with iron-containing ingredients as α-FeOOH, Γ-FeOOH, Γ-Fe2O3 and Fe3O4. The sample of natural biomass was tested in reaction of CO oxidation and it showed potential to be used as catalyst support.

Study of Urea Embed Mesoporous Nano Silica on Yield and Yield Attributing Characters of Rice Grown in Mollisols

2019 ◽  
Vol 6 (02) ◽  
Author(s):  
KHARAG SINGH1 ◽  
VIJAY KANT SINGH ◽  
SHRI RAM ◽  
KRISHNA PAL SINGH
Keyword(s):  
Aqueous Solution ◽  
Oryza Sativa L ◽  
Energy Requirement ◽  
Growth Parameter ◽  
Panicle Length ◽  
Nano Silica ◽  
Chemical Fertilizers ◽  
Yield Attributes ◽  
Open The Doors ◽  
1000 Grain Weight

Rice (Oryza sativa L.) is a stable food more than two billion people are getting 60-70 per cent their energy requirement from rice and its derived products. Present research investigated effect of urea embed mNS (embed in the mesoporousnano silica by simple immersion loading using aqueous solution and this formulation of nanofertilizer) on rice crop in pot experiment under polyhouse condition. Nine treatments consisted (T1: Control, T2:N30P60K40,T3:N60P60K40, T4:N90P60K40, T5:N120P60K40, T6:N30(mNS)P60K40,T7:N60(mNS)P60K40, T8:N90(mNS)P60K40 and T9:N120 (mNS)P60K40.) in three replications. In this study, the results revealed that the growth parameter, grain and straw yields as well as yield attributes (effective tillers, panicle length, grains per panicle and 1000-grain weight) were significantly affected by urea embed nano silica application. The highest grain and straw yields were recorded in treatment T9 giving 323.02 and 124.05 per cent more over control, due to exposure of urea embed mNS as compared to ordinary urea dose of chemical fertilizers. The sustained release of urea embedded mNSaccurs 7-8 days after exposure which is extraordinarily slow as compared to ordinary urea. These results are preliminary but promising and open the doors to use nanomaterials as an efficient nanofertilizer.

scholarly journals Adsorptive Removal of Fluoride from Aqueous Solution by Biogenic Iron Permeated Activated Carbon Derived from Sweet Lime Waste

2019 ◽  
pp. 123-136 ◽  
Author(s):  
Mohd. Ibrahim ◽  
Adil Siddique ◽  
Lata Verma ◽  
Jiwan Singh ◽  
Janardhan Reddy Koduru
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Adsorptive Removal ◽  
Sweet Lime ◽  
Biogenic Iron

Structures Formed by Cryoprotective Agents Used in Freezc-Etching

1971 ◽  
Vol 29 ◽  
pp. 448-449
Author(s):  
G. G. Cocks ◽  
C. E. Cluthe
Keyword(s):  
Aqueous Solution ◽  
Polyethylene Oxide ◽  
Liquid Nitrogen Temperature ◽  
Ice Crystals ◽  
Etching Technique ◽  
Structural Constituent ◽  
Cryoprotective Agents ◽  
Quick Freezing ◽  
Freeze Etching ◽  
Fractured Surface

The freeze etching technique is potentially useful for examining dilute solutions or suspensions of macromolecular materials. Quick freezing of aqueous solutions in Freon or propane at or near liquid nitrogen temperature produces relatively large ice crystals and these crystals may damage the structures to be examined. Cryoprotective agents may reduce damage to the specimem, hut their use often results in the formation of a different set of specimem artifacts.In a study of the structure of polyethylene oxide gels glycerol and sucrose were used as cryoprotective agents. The experiments reported here show some of the structures which can appear when these cryoprotective agents are used.Figure 1 shows a fractured surface of a frozen 25% aqueous solution of sucrose. The branches of dendritic ice crystals surrounded hy ice-sucrose eutectic can be seen. When this fractured surface is etched the ice in the dendrites sublimes giving the type of structure shown in Figure 2. The ice-sucrose eutectic etches much more slowly. It is the smooth continuous structural constituent surrounding the branches of the dendrites.

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