Flocculation behaviour of hematite–kaolinite suspensions in presence of extracellular bacterial proteins and polysaccharides

Poorni, S.; Natarajan, K.A.

doi:10.1016/j.colsurfb.2013.09.049

Cited by 32 publications

(9 citation statements)

References 15 publications

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“…This phenomenon protects the organisms from becoming encrusted with minerals. 21 One of the most abundant polysaccharide involved in biomineralization is chitin. The outstanding mechanical properties of chitin 22 play a very important role in Nature, where it is the main structural material that conveys stiffness and mechanical stability to the hard structures of arthropod cuticles, 23 mollusc shells, 24,25 gastropod operculi, 26 cuttlebones, 27,28 diatoms, 29 corals 30 and sponges.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of nanostructured chitin–hematite composites under extreme biomimetic conditions

et al. 2014

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Chitin of poriferan origin is a unique and thermostable biological material. It also represents an example of a renewable materials source due to the high regeneration ability of Aplysina sponges under marine ranching conditions. Chitinous scaffolds isolated from the skeleton of the marine sponge Aplysina aerophoba were used as a template for the in vitro formation of Fe 2 O 3 under conditions (pH $ 1.5, 90 C) which are extreme for biological materials. Novel chitin-Fe 2 O 3 three dimensional composites, which have been prepared for the first time using hydrothermal synthesis, were thoroughly characterized using numerous analytical methods including Raman spectroscopy, XPS, XRD, electron diffraction and HR-TEM. We demonstrate the growth of uniform Fe 2 O 3 nanocrystals into the nanostructured chitin substrate and propose a possible mechanism of chitin-hematite interactions. Moreover, we show that composites made of sponge chitin-Fe 2 O 3 hybrid materials with active carbon can be successfully used as electrode materials for electrochemical capacitors.

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Section: Introductionmentioning

confidence: 99%

Synthesis of nanostructured chitin–hematite composites under extreme biomimetic conditions

et al. 2014

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“…The adsorption behaviors of the bioflocculant onto clay minerals should be related to the chemical complexation and hydrogen bonds between the polysaccharide and the clay minerals. The reports convincingly demonstrated that polysaccharide adsorption on mineral surfaces occurs through chemical complexation and hydrogen bonds. , Moreover, many researchers proposed that metabolites from kaolinite-grown cells showed the highest adsorption on kaolinite . The low adsorption rate of the bioflocculant on negatively charged quartz surfaces is due to the promotion of proteins.…”

Section: Results and Discussionmentioning

confidence: 99%

“…40,49 Moreover, many researchers proposed that metabolites from kaolinitegrown cells showed the highest adsorption on kaolinite. 50 The low adsorption rate of the bioflocculant on negatively charged quartz surfaces is due to the promotion of proteins. Extracellular proteins can adsorb onto quartz surface and active quartz.…”

Section: Energy and Fuelsmentioning

confidence: 99%

Flocculation of Coal Waste Slurry Using Bioflocculant Produced byAzotobacter chroococcum

2017

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The flocculation technique is the most common sedimentation method for the dewatering of coal waste slurry, which is fine grained and has high ash content. Bioflocculants are flocculants which are vital to accelerating the settling of coal waste slurry via the flocculation technique. In this work, the bioflocculation of coal waste slurry was studied using a biofloccuant produced by Azotobacter chroococcum. Quartz and clay minerals were used for comparison. Flocculation tests showed that the bioflocculant effectively flocculated coal waste slurry. Approximately 83% of the flocculation rate was achieved at a bioflocculant dosage of 80 mg/L when the coal waste slurry concentration was 30 g/L. The maximum flocculation of coal waste slurry occurred around pH 2. The flocculation of clay minerals and quartz under the same conditions indicated that the bioflocculant flocculated clay minerals effectively and efficiently, but quartz was scarcely flocculated. ζ-Potential measurements showed that the surface charges of demineralized coal, clay minerals, and quartz became more negative after interaction with the bioflocculant. Adsorption tests and FTIR analysis results suggested that the bioflocculant shows a higher affinity to the demineralized coal, kaolinite, and illite than to quartz. Quartz had a negative impact on coal waste slurry flocculation with the bioflocculant.

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“…These authors related their observation to the decrease in the measured zeta potentials of bacteria and minerals, and subsequently their higher electrostatic repulsion. Similarly, the attachment of P. putida to kaolinite was reported to decrease with the increase in pH from 3·0 to 10·0 (Jiang et al 2007; Poorni and Natarajan 2014). No pH values below 5 were tested in our study due to a low feasibility in applying and maintaining such a low pH in water and wastewater disinfection treatment.…”

Section: Discussionmentioning

confidence: 96%

Efficient removal of bacteria from aqueous media with kaolinite and diatomaceous earth products

Johnson

Brineman

Schultze

et al. 2020

Journal of Applied Microbiology

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Aims: To understand the relationships between physical and chemical parameters of kaolinite and diatomaceous earth, and their capacities to remove bacteria from aqueous media. To determine the optimal aqueous media parameters for use of these products in water disinfection processes. Methods and Results: Seven kaolinite and three diatomaceous earth products were evaluated. Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus and Bacillus megaterium were used as proxy for bacterial pathogens. Fully calcined kaolin and amorphous diatomaceous earth demonstrated the highest extent and consistency in removing all the bacteria. The removal depended on ionic strength and pH of aqueous media with 100 mmol l À1 pH 5 potassium hydrogen phthalate buffer revealing the highest (2 log per gram) extent of the removal. Al 3+ cations enhanced sorption up to 4 log per gram. Conclusions: Calcined kaolin and amorphous diatomaceous earth are excellent sorbents for bacteria. Significance and Impact of the Study: Fully calcined kaolin and amorphous diatomaceous earth are perspective tools for wastewater and water disinfection against waterborne bacterial pathogens.

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Flocculation behaviour of hematite–kaolinite suspensions in presence of extracellular bacterial proteins and polysaccharides

Cited by 32 publications

References 15 publications

Synthesis of nanostructured chitin–hematite composites under extreme biomimetic conditions

Synthesis of nanostructured chitin–hematite composites under extreme biomimetic conditions

Flocculation of Coal Waste Slurry Using Bioflocculant Produced byAzotobacter chroococcum

Efficient removal of bacteria from aqueous media with kaolinite and diatomaceous earth products

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