Studies on Bioflocculant Production by Bacillus sp. AEMREG7

Okaiyeto, Kunle; Nwodo, Uchechukwu U.; Okoli, Arinze S.; Leonard, Leonard V. Leonard; Okoh, Anthony I.

doi:10.15244/pjoes/59331

Cited by 10 publications

(8 citation statements)

References 56 publications

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“…Aluminium salts have been frequently used in drinking water and wastewater treatment due to their high flocculating efficiency and cost-effectiveness. Nevertheless, residual aluminium concentrations in treated water impose health problems [ 21 ]; consequently, in this present study, Ca 2+ was used as a flocculation aid. Furthermore, Nwodo and Okoh [ 16 ] reported similar findings by Cellulomonas sp.…”

Section: Resultsmentioning

confidence: 99%

“…The flocculating activity of bioflocculant produced by Bacillus sp. AEMREG7 was greatly enhanced in the presence of Ca 2+ as well [ 21 ]. Valence plays a crucial role in the flocculation efficiency, as observed by Okaiyeto et al [ 13 ], the flocculating activity of the bioflocculant produced by Halomonas sp.…”

Section: Resultsmentioning

confidence: 99%

“…Several terrestrial and aquatic environments have been explored and microbes from various taxonomic genera including Streptomyces, Brachybacteria and Cellulomonas [ 9 , 16 ]; amongst the actinobacteria species Vagococcus , Arthrobacter , Scenedesmus and Bacillus [ 11 , 17 , 18 , 19 ], among others, have all been found to produce bioflocculants. The compositions of some of the identified bioflocculants have included polysaccharides, proteins, uronic acids, sugar conjugates and proteins [ 20 , 21 , 22 ]. The chemical compositions and flocculating efficiency of bioflocculants depends on some factors, including the nature of the environment in which bioflocculant-producing microorganisms were isolated, the media compositions in which the microorganisms are cultivated, the functional groups and molecular weight of the bioflocculant [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

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A Marine Bacterium, Bacillus sp. Isolated from the Sediment Samples of Algoa Bay in South Africa Produces a Polysaccharide-Bioflocculant

Ntozonke

Okaiyeto

Okoli

et al. 2017

IJERPH

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Bioflocculants mediate the removal of suspended particles from solution and the efficiency of flocculation is dependent on the characteristics of the flocculant. Apart from the merits of biodegradability and harmlessness, bioflocculants could be viable as industrially relevant flocculants as they are a renewable resource. Additionally, the shortcomings associated with the conventionally used flocculants such as aluminium salts and acrylamide polymers, which include dementia and cancer, highlight more the need to use bioflocculants as an alternative. Consequently, in this study a marine sediment bacterial isolate was screened for bioflocculant production. Basic local alignment search tools (BLAST) analysis of 16S ribosomal deoxyribonucleic acid (rDNA) sequence of the bacterial isolate showed 98% similarity to Bacillus thuringiensis MR-R1. The bacteria produced bioflocculant optimally with inoculum size (4% v/v) (85%), glucose (85.65%) and mixed nitrogen source (urea, ammonium chloride and yeast extract) (75.9%) and the divalent cation (Ca2+) (62.3%). Under optimal conditions, a maximum flocculating activity of over 85% was attained after 60 h of cultivation. The purified polysaccharide-bioflocculant flocculated optimally at alkaline pH 12 (81%), in the presence of Mn2+ (73%) and Ca2+ (72.8%). The high flocculation activity shown indicates that the bioflocculant may contend favourably as an alternative to the conventionally used flocculants in water treatment.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Marine Bacterium, Bacillus sp. Isolated from the Sediment Samples of Algoa Bay in South Africa Produces a Polysaccharide-Bioflocculant

Ntozonke

Okaiyeto

Okoli

et al. 2017

IJERPH

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“…Salvia o cinalis is well known of Salvia genus. Silver nanoparticles synthesised from S. o cinalis was reported to display signi cant antibacterial [18], antiplasmodial [19], antioxidant and antiin ammatory [20], antileishmanial effects [21].…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of Silver Nanoparticles from Salvia Aethiopis L. and their Antioxidant Activity

Geçer

2021

Preprint

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Salvia aethiopis L. was heated in distilled water for 2 hours. After filtration, water extract was treated with silver nitrate for 2 hours at 60°C to yield the silver nanoparticles (Sa-AgNPs). The structure of silver nanoparticles was elucidated by spectroscopic methods such as Ultraviolet-visible (UV-Vis), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and Scanning electron microscope (SEM). The maximum absorption in UV-Vis spectrum was observed at 508 nm. XRD pattern at (2θ) 38.1°, 44.3°, 64.4°, and 77.4° degrees can be assigned to the (111), (200), (220) and (311) Bragg’s reflections of the face-centered cubic crystalline structure. The average size of Sa-AgNPs was found as 74.09 nm by SEM analysis. The characteristic hydroxyl vibration signal appeared at 3222 cm− 1. Antioxidant activity of extract and Sa-AgNPs were carried out using DPPH•, ABTS•+ FRAP assay. The Sa-AgNPs revealed the considerable ABTS•+ scavenging effect with the value of 4.93 (IC50, µg/mL) compared to BHT (IC50, µg/mL, 8.34). However, Sa-AgNPs displayed the lower DPPH• activity (IC50, µg/mL, 24.37) than that of the standard BHT (IC50, µg/mL, 9.67). The reducing power activity of Sa-AgNPs was found as 4.52 (µmol TE/mg extract) while the standard BHT value was 488 (µmol TE/mg extract).

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“…In the last decades, kaolin clay plays a significant role in a wide range of environmental and medical problems and its applications are continually increasing [10][11], especially as an adsorbent in the removal of organic contaminants and heavy metal ions from aqueous medium [12][13][14][15][16]. Covalent immobilization onto layer silicate supports of a desired chelate moiety, with the specific purpose of obtaining selective adsorbent materials, is one of the most important procedures to develop highly selective matrices.…”

Section: Introductionmentioning

confidence: 99%

Valorisation and Modification of Saharan Clay for Removal of Cu(II), Ni(II), Co(II) and Cd(II) from Aqueous Solutions

Meroufel¹,

Zenasni²,

George³

2020

Pol. J. Environ. Stud.

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The organosilane-modified Saharan kaolin (KS) was prepared and tested as an adsorbent for Cu(II), Ni(II), Co(II) and Cd(II) removal from aqueous solution in comparison with original Saharan kaolin (K). Characterization of modified clay material and original clay was carried out by different methods (XRD, FTIR, TGA and SEM) in order to establish the link between synthesis, structures and properties. The hydrophilic properties of the clay surface have been modified, but not turned into hydrophobic ones. The graft has indeed a polar amine group and the chain length is too short to present an important hydrophobic character. The adsorption of heavy metal ions onto APTES-modified kaolin showed greater efficiency than original kaolin. The adsorption of metal ions by the original kaolin is dominated by the cation exchange phenomenon with a preferential order of selectivity: Cu(II)>Ni(II)>Co(II)>Cd(II), while adsorption on KS is mainly dominated by attraction of the chelating group of the amine in the same order of selectivity. This new hybrid organic-inorganic material may be a good alternative for separation and preconcentration of heavy metal ions.

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Studies on Bioflocculant Production by Bacillus sp. AEMREG7

Cited by 10 publications

References 56 publications

A Marine Bacterium, Bacillus sp. Isolated from the Sediment Samples of Algoa Bay in South Africa Produces a Polysaccharide-Bioflocculant

A Marine Bacterium, Bacillus sp. Isolated from the Sediment Samples of Algoa Bay in South Africa Produces a Polysaccharide-Bioflocculant

Green Synthesis of Silver Nanoparticles from Salvia Aethiopis L. and their Antioxidant Activity

Valorisation and Modification of Saharan Clay for Removal of Cu(II), Ni(II), Co(II) and Cd(II) from Aqueous Solutions

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