Biosorption of humic and fulvic acids to live activated sludge biomass

Esparza-Soto, Mario; Westerhoff, Paul

doi:10.1016/s0043-1354(02)00630-9

Cited by 133 publications

(48 citation statements)

References 35 publications

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“…This could also be explained by DLVO theory: the double layer becomes compressed, reducing the surface potential but keeping the surface charge density constant, since the amount of H 3 O + increases at low pH. 32,33 Consequently, the light metal ions were compressed and released from the aerobic granules. On the other hand, it could be attributed to the possible damage to active sites on the surface of the aerobic granules under the strongly acidic conditions, which favour the release of light metal ions.…”

Section: Biosorption Mechanismmentioning

confidence: 98%

“…30,31 The total interaction forces decrease as the double-layer repulsion forces decrease, since the double layer becomes compressed at high IS, while the van der Waals attraction forces remain independent of the solution IS. 32,33 On the other hand, the higher biosorption capacity at high IS is possibly due to the compression of the double layer resulting in a closer approach of Cu(II) ions and aerobic granules, which increases the biosorption capacity of the biomass.…”

Section: Effect Of Ph and Is On Cu(ii) Biosorptionmentioning

confidence: 99%

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Influence of pH and ionic strength on Cu(II) biosorption by aerobic granular sludge and biosorption mechanism

Gai

Wang

Gong

et al. 2008

J of Chemical Tech & Biotech

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Section: Biosorption Mechanismmentioning

confidence: 98%

Section: Effect Of Ph and Is On Cu(ii) Biosorptionmentioning

confidence: 99%

Influence of pH and ionic strength on Cu(II) biosorption by aerobic granular sludge and biosorption mechanism

Gai

Wang

Gong

et al. 2008

J of Chemical Tech & Biotech

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“…They are also involved in cell recognition, adhesion to surfaces and in the formation of biofilms [2]. EPS is mostly negatively charged due to the presence of abundant carboxylic and phosphoric functional groups and can potentially bind with positively charged metal ions and organic compounds through electrostatic interactions [3]. The net surface charge of the EPS may also vary based on the composition of amino acids in proteins and the type of sugars in the EPS [1].…”

Section: Introductionmentioning

confidence: 99%

A facile synthesis of silver nanoparticle with SERS and antimicrobial activity usingBacillus subtilisexopolysaccharides

Selvakumar

Aravindh

Ashok

et al. 2013

Journal of Experimental Nanoscience

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In this study, we report a facile synthesis of silver nanoparticle having SERS and antimicrobial activity using bacterial exopolysaccharide (EPS). Bacillus subtilis (MTCC 2422) was grown in nutrient broth and the extracellular EPS secreted by the organism was extracted and purified. The purified EPS was used for the synthesis of silver nanoparticles. The kinetics of silver nanoparticle synthesis was deduced by varying the exposure time and the concentration of EPS. The rate constant (k) for the synthesis of silver nanoparticle was calculated from the slope of ln(A 1 À A t ) versus time plot. The k value was found to be 3.49 Â 10 À3 , 5.81 Â 10 À3 and 5.03 Â 10 À3 per min for particle synthesis using 2, 5 and 10 mg/mL EPS, respectively. The nanoparticles synthesised had an average particle size of 5.18 AE 1.49 nm, 1.96 AE 0.77 nm and 2.08 AE 0.88 nm for 2, 5 and 10 mg/mL EPS, respectively. The synthesised particles were characterised using UV-Vis absorbance spectroscopy, high-resolution transmission electron microscopy (HRTEM) attached to EDS (energy dispersive spectroscopy), Fourier transform infrared spectroscopy (FTIR), surface enhanced Raman spectroscopy (SERS) and zeta potential analyser. To our knowledge, this is the first study to report SERS activity of microbial Bacillus subtilis EPS-based synthesis of silver nanoparticle. HRTEM images showed silver nanoparticle entrapped in polysaccharide nanocages. Silver nanoparticle showed higher adherence towards the bacterial surface, with good bactericidal activity against Pseudomonas aeroginosa and Staphylococcus aureus.

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“…In soil, bacterial exudates may participate in many ecologically relevant processes. For example, EPS can sorb or flocculate other OM constituents (Esparza-Soto and Westerhoff, 2003;Ding et al, 2008), bind toxic metals (Guibaud et al, 2006;Kumar et al, 2007;Aguilera et al, 2008;Kiran and Kaushik, 2008), promote the dissolution of minerals (Zhu et al, 2008), and enhance aggregate stability (Watanabe et al, 1999;Jaisi et al, 2007). Moreover, as EPS comprise intrinsically labile compounds, they provide a readily available C source for biosynthesis (de Brouwer et al, 2002) although an unknown portion may escape microbial utilization via sorption to mineral surfaces or complexation with metals.…”

Section: Introductionmentioning

confidence: 99%

Stabilization of extracellular polymeric substances (Bacillus subtilis) by adsorption to and coprecipitation with Al forms

Mikutta

Zang

Chorover

et al. 2011

Geochimica et Cosmochimica Acta

106

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Stabilization of extracellular polymeric substances (Bacillus subtilis) by adsorption to and coprecipitation with Al forms Mikutta, R.; Zang, U.; Chorover, J.; Haumaier, L.; Kalbitz, K. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Abstract Extracellular polymeric substances (EPS) are continuously produced by bacteria during their growth and metabolism. In soils, EPS are bound to cell surfaces, associated with biofilms, or released into solution where they can react with other solutes and soil particle surfaces. If such reaction results in a decrease in EPS bioaccessibility, it may contribute to stabilization of microbial-derived organic carbon (OC) in soil. Here we examined: (i) the chemical fractionation of EPS produced by a common Gram positive soil bacterial strain (Bacillus subtilis) during reaction with dissolved and colloidal Al species and (ii) the resulting stabilization against desorption and microbial decay by the respective coprecipitation (with dissolved Al) and adsorption (with Al(OH) 3(am) ) processes. Coprecipitates and adsorption complexes obtained following EPS-Al reaction as a function of pH and ionic strength were characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The stability of adsorbed and coprecipitated EPS against biodegradation was assessed by mineralization experiments for 1100 h. Up to 60% of the initial 100 mg/L EPS-C was adsorbed at the highest initial molar Al:C ratio (1.86), but this still resulted only in a moderate OC mass fraction in the solid phase (17 mg/g Al(OH) 3(am) ). In contrast, while coprecipitation by Al was less efficient in removing EPS from solution (maximum values of 33% at molar Al:C ratios of 0.1-0.2), the OC mass fraction in the solid product was substantially larger than that in adsorption complexes. Organic P compounds were preferentially bound during both adsorption and coprecipitation. Data are consistent with strong ligand exchange of EPS phosphoryl groups during adsorption to Al(OH) 3(am) , whereas for coprecipitation weaker sorption mechanisms are also involved. X-ray photoelectron analyses indicate an intimate mixing of EPS with Al in the coprecipitates, which is not observed in the case of EPS adsorption complexes. The incubation experiments...

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Biosorption of humic and fulvic acids to live activated sludge biomass

Cited by 133 publications

References 35 publications

Influence of pH and ionic strength on Cu(II) biosorption by aerobic granular sludge and biosorption mechanism

Influence of pH and ionic strength on Cu(II) biosorption by aerobic granular sludge and biosorption mechanism

A facile synthesis of silver nanoparticle with SERS and antimicrobial activity usingBacillus subtilisexopolysaccharides

Stabilization of extracellular polymeric substances (Bacillus subtilis) by adsorption to and coprecipitation with Al forms

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