A meta-analysis of metal biosorption by suspended bacteria from three phyla

Fathollahi, Alireza; Khasteganan, Nazanin; Coupe, Stephen J.; Newman, Alan

doi:10.1016/j.chemosphere.2020.129290

Cited by 51 publications

(12 citation statements)

References 127 publications

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“…The types and the number of pollutants that are being removed through biosorption are consistently expanding, including metals, dyes, antibiotics and other pharmaceuticals, and persistent organic pollutants (Lindane, 2,4-Dichlorophenol, 2-Chlorobiphenyl, Pentachloro-nitrobenzene) [1][2][3][4][5]. Biosorption using microbial biomass processes is influenced by several physiochemical parameters, such as pH, temperature, biomass dosage, initial pollutant concentration, contact time, type of pollutant, and type of biosorbent [11].…”

Section: Introductionmentioning

confidence: 99%

Polysaccharides Used in Biosorbents Preparation for Organic Dyes Retaining from Aqueous Media

et al. 2022

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Natural polymers can themselves be efficient as materials with biosorptive properties but can also be used to transform microbial biomass into an easy-to-handle form, respectively, into biosorbents, through immobilization. The article aims to study biosorbents based on residual microbial biomass (Saccharomyces pastorianus yeast, separated after the brewing process by centrifugation and dried at 80 °C) immobilized in sodium alginate. The biosorptive properties of this type of biosorbent (spherical particles 2 and 4 mm in diameter) were studied for removal of reactive dye Brilliant Red HE-3B (with concentration in range of 16.88–174.08 mg/L) from aqueous media. The paper aims at three aspects: (i) the physico-chemical characterization of the biosorbent (Scanning Electron Microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDX) and Fourier Transform Infrared (FTIR) spectra); (ii) the modeling of biosorption data in order to calculate the quantitative characteristic parameters using three equilibrium isotherms (Langmuir, Freundlich, and Dubinin–Radushkevich—DR); and (iii) the evaluation of thermal effect and the possible mechanism of action. The results of the study showed that biosorption capacity evaluated by Langmuir (I) model is 222.22 mg/g (ϕ = 2 mm) and 151.51 mg/g (ϕ = 4 mm) at 30 °C, and the free energy of biosorption (E) is in the range of 8.45–13.608 KJ/mol (from the DR equation). The values of thermodynamic parameters suggested an exothermic process due the negative value of free Gibbs energy (ΔG0 = −9.031 kJ/mol till −3.776 kJ/mol) and enthalpy (about ΔH0 = −87.795 KJ/mol). The obtained results underline our finding that the immobilization in sodium alginate of the residual microbial biomass of Saccharomyces pastorianus led to an efficient biosorbent useful in static operating system in the case of effluents with moderate concentrations of organic dyes.

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Section: Introductionmentioning

confidence: 99%

Polysaccharides Used in Biosorbents Preparation for Organic Dyes Retaining from Aqueous Media

et al. 2022

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“…Microbial biosorbents obtained from bacterial, yeast, or filamentous fungi cells [1][2][3][4][5] are used for their ability to bind pollutants (heavy metals, dies, antibiotics) by ionic interactions between the functional groups from the polymers contained in the extracellular surface of the dead (inactive) or living cells and the pollutant, depending on many factors such as pollutant chemical properties and structure, type of biomass (size and structure), pH, temperature, mixing, pollutant concentration, and biosorbent quantity [1]. Microorganisms have the ability to enzymatically degrade dye molecules and have high dye sorption…”

Section: Introductionmentioning

confidence: 99%

Biosorbents Based on Biopolymers from Natural Sources and Food Waste to Retain the Methylene Blue Dye from the Aqueous Medium

et al. 2022

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The use of a biosorbent based on residual biomass from brewing industry (Saccharomyces pastorianus) immobilized in a natural biopolymer (sodium alginate) was investigated for Methylene Blue removal from aqueous medium. Saccharomyces pastorianus, immobilized by a simple entrapment technique and by microencapsulation in alginate was characterized using SEM, EDAX, pHPZC and the biosorption behavior toward organic pollutant, such as cationic dye. The biosorption experiments were studied by assessing, in a first stage, the influence of the most important operational physical parameters on the efficiency of the biosorbent: the initial concentration of the dye, the contact time between phases, the temperature, the dye solution pH, the biosorbent granule size, and the amount of biosorbent. The highest sorption capacity was obtained for the biosorbent obtained by microencapsulation, at pH 9, at biosorbent dose of 5.28 g/L and a contact time of about 100 min. The biosorption equilibrium was then studied by modeling the data on the Langmuir, Freundlich and Dubinin- Radushkevich isotherms. The Langmuir model is best suited for experimental data on both particle sizes leading to a maximum biosorption capacity of 188.679 mg/g at room temperature. The values of the adsorption energy, E, obtained with the help of the Dubinin-Radushkevich model-suggest that the type of mechanism (physical or chemical) involved in the biosorption process depends on the particle size of the biosorbent. The results confirm that the residual microbial biomass of Saccharomyces pastorianus immobilized in a polymeric matrix such as sodium alginate, can be considered an efficient biosorbent in retaining cationic organic dyes present in aqueous solutions in moderate concentrations.

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“…Rizvi et al (2020) show that bacteria such as P. aeruginosa and Bacillus subtilis are efficient in removing some metallic ions. While, Fathollahi et al (2021) demonstrate that high concentrations of metals interfere with bacterial metabolism, reducing the potential for biosorption. Thus, these studies demonstrate that homeostatic balance is Brazilian Journal of Health Review, Curitiba, v.5, n.1, p. 2900-2922 jan./fev.…”

Section: Metal Ion Absorption Capacitymentioning

confidence: 99%

Virulence factors of human pathogens: an always-needed approach / Fatores de virulência de patógenos humanos: uma abordagem sempre necessária

Silva¹,

Silva²,

Sá³

et al. 2022

Braz. J. Hea. Rev.

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Hospital infections caused by resistant bacteria are a worldwide public health problem that mainly affects immunocompromised patients. These infections are mainly caused by inadequate antibiotic prescriptions, self-medication and long hospital stays. The World Health Organization mentions a list of resistant bacteria, especially Gram-negative ones considered as priorities for research, discovery and development of new drugs. These pathogens to survive and propagate use a varied set of strategies known as virulence factors. The present study corresponds to a review of the state-of-the-art related to main factors associated with pathogenicity in clinical important Gram-positive and Gram-negative bacteria. The virulence factors, alone or together, guarantee important defenses to the host organism's immune system, as well as adverse external conditions. Consequently, there is an increase in morbidity and mortality rates in hospital environments. Thus, effective microbial control measures are needed, especially in health institutions; also, the encouragement of new therapeutic approaches that target the main virulence factors.

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A meta-analysis of metal biosorption by suspended bacteria from three phyla

Cited by 51 publications

References 127 publications

Polysaccharides Used in Biosorbents Preparation for Organic Dyes Retaining from Aqueous Media

Polysaccharides Used in Biosorbents Preparation for Organic Dyes Retaining from Aqueous Media

Biosorbents Based on Biopolymers from Natural Sources and Food Waste to Retain the Methylene Blue Dye from the Aqueous Medium

Virulence factors of human pathogens: an always-needed approach / Fatores de virulência de patógenos humanos: uma abordagem sempre necessária

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