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Hoyle-Gardner J, Badisa VLD, Sher S, Runwei L, Mwashote B, Ibeanusi V. Bacillus sp. strain MRS-1: A potential candidate for uranyl biosorption from uranyl polluted sites. Saudi J Biol Sci 2023; 30:103873. [PMID: 38073661 PMCID: PMC10709514 DOI: 10.1016/j.sjbs.2023.103873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 10/27/2023] [Accepted: 11/10/2023] [Indexed: 06/27/2024] Open
Abstract
The uranyl tolerance of a metal-resistant Bacillus sp. strain MRS-1, was determined in this current study. This was done due to a rise in anthropogenic activities, such as the production of uranium-based nuclear energy, which contributes to environmental degradation and poses risks to ecosystems and human health. The purpose of the research was to find effective strategies for uranium removal to minimize the contamination. In this paper, the biosorption of uranyl was investigated by batch tests. Bacteria could continue to multiply up to 350 ppm uranyl concentrations, however this growth was suppressed at 400 ppm, that generally accepted as the minimum concentration for bacterial growth inhibition. The optimal conditions for uranyl biosorption were pH 7, 20 °C, and a contact duration of 30 min with living bacteria. According to the findings of an investigation that used isotherm and kinetics models (Langmuir, Freundlich and pseudo second order), Bacillus sp. strain MRS-1 biosorption seemed to be dependent on monolayer adsorption as well as certain functional groups that had a strong affinity for uranyl confirmed by Fourier Transform Infrared Spectroscopy (FTIR) analysis. The shifts/sharping of peaks (1081-3304 cm-1) were prominent in treated samples compared to control one. These functional groups could be hydroxyl, amino, and carboxyl. Our findings showed that Bacillus sp. strain MRS-1 has an elevated uranyl biosorption ability, with 24.5 mg/g being achieved. This indicates its potential as a powerful biosorbent for dealing with uranium contamination in drinking water sources and represents a breakthrough in the cleanup of contaminated ecosystems.
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Affiliation(s)
- Jada Hoyle-Gardner
- Core Laboratory, School of the Environment, Florida A&M University, Tallahassee, FL, USA
- Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | | | - Shahid Sher
- Williams Lab, School of the Environment, Florida A&M University, Tallahassee, FL, USA
| | - Li Runwei
- Department of Civil Engineering, New Mexico State University, Las Cruces, NM, USA
| | - Benjamin Mwashote
- Core Laboratory, School of the Environment, Florida A&M University, Tallahassee, FL, USA
| | - Victor Ibeanusi
- Core Laboratory, School of the Environment, Florida A&M University, Tallahassee, FL, USA
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Hoyle-Gardner J, Jones W, Badisa VLD, Mwashote B, Ibeanusi V, Gaines T, Lowenthal H, Tucker L. Lead metal biosorption and isotherms studies by metal-resistant Bacillus strain MRS-2 bacterium. J Basic Microbiol 2021; 61:697-708. [PMID: 34228374 DOI: 10.1002/jobm.202100155] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 06/11/2021] [Accepted: 06/18/2021] [Indexed: 11/09/2022]
Abstract
In this study, lead (Pb) biosorption studies in aqueous solution were performed with metal-resistant Bacillus strain MRS-2 (ATCC 55674) bacterium which was previously isolated from wastewater plant. It showed minimum inhibition concentration of 300 ppm Pb on the nutrient agar plates. Pb biosorption using MRS-2 bacteria was investigated under different parameters such as pH, temperature, biomass dosage, initial Pb concentration, contact time, and type of biomass by batch experiments. Pb concentration was analyzed through Inductively coupled plasma-optical emission spectrometry. The rate of biosorption (Q) and Pb biosorption capacity (qe ) were calculated for above mentioned parameters. It was observed that Pb precipitates by itself from the solution at pH 2 and 8 or above without bacteria and precipitation did not increase even in the presence of bacteria. The results showed that the highest biosorption rate and biosorption capacity (mg/g) were observed at pH 7, 25°C, 2-h contact time with live bacteria. The highest biosorption rate was observed at 1.5 g/L biomass dose and 5 ppm initial Pb concentration, whereas the highest Pb biosorption capacity was observed at 0.25 g/L biomass dose and 12.5 ppm initial Pb concentration. It was observed that Pb biosorption by live bacteria occurred through adsorption on cell surface. In this study, the biosorption isotherm analysis favored the Langmuir isotherm model indicating monolayer biosorption. This Bacillus strain showed higher Pb biosorption capacity than most of the previously reported Bacillus strains. In conclusion, this study indicates that the Bacillus MRS-2 strain can be used to remove Pb from industrial wastewaters in an ecofriendly approach.
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Affiliation(s)
- Jada Hoyle-Gardner
- Core Laboratory, School of the Environment, Florida A&M University, Tallahassee, Florida, USA
| | - Winslow Jones
- Core Laboratory, School of the Environment, Florida A&M University, Tallahassee, Florida, USA
| | - Veera L D Badisa
- Core Laboratory, School of the Environment, Florida A&M University, Tallahassee, Florida, USA
| | - Benjamin Mwashote
- Core Laboratory, School of the Environment, Florida A&M University, Tallahassee, Florida, USA
| | - Victor Ibeanusi
- Core Laboratory, School of the Environment, Florida A&M University, Tallahassee, Florida, USA
| | - Treasure Gaines
- Core Laboratory, School of the Environment, Florida A&M University, Tallahassee, Florida, USA
| | - Hannah Lowenthal
- Core Laboratory, School of the Environment, Florida A&M University, Tallahassee, Florida, USA
| | - Landon Tucker
- Core Laboratory, School of the Environment, Florida A&M University, Tallahassee, Florida, USA
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Removal of heavy metals from aqueous solution by poly(ethyleneimine)-functionalized silica: studies on equilibrium isotherm, kinetics, and thermodynamics of interactions. RESEARCH ON CHEMICAL INTERMEDIATES 2013. [DOI: 10.1007/s11164-013-1499-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Aelion CM, Davis HT, Flora JRV, Kirtland BC, Amidon MB. Application of encapsulation (pH-sensitive polymer and phosphate buffer macrocapsules): a novel approach to remediation of acidic ground water. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2009; 157:186-193. [PMID: 18774208 DOI: 10.1016/j.envpol.2008.07.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2008] [Revised: 06/24/2008] [Accepted: 07/17/2008] [Indexed: 05/26/2023]
Abstract
Macrocapsules, composed of a pH-sensitive polymer and phosphate buffer, offer a novel remediation alternative for acidic ground waters. To test their potential effectiveness, laboratory experiments were carried out followed by a field trial within a coal pile runoff (CPR) acidic contaminant plume. Results of traditional limestone and macrocapsule treatments were compared in both laboratory and field experiments. Macrocapsules were more effective than limestone as a passive treatment for raising pH in well water from 2.5 to 6 in both laboratory and field experiments. The limestone treatments had limited impact on pH, only increasing pH as high as 3.3, and armoring by iron was evident in the field trial. Aluminum, iron and sulfate concentrations remained relatively constant throughout the experiments, but phosphate increased (0.15-32 mg/L), indicating macrocapsule release. This research confirmed that macrocapsules may be an effective alternative to limestone to treat highly acidic ground water.
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Affiliation(s)
- C Marjorie Aelion
- University of South Carolina, Department of Environmental Health Sciences, 921 Assembly Street, Columbia, SC 29208, USA.
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