A novel bioflocculant for chromium (Ⅵ) and arsenic (Ⅲ) removal: Extracellular polymeric substance (EPS) of Pseudomonas fluorescens

Mapping Intimacies ◽

10.5194/egusphere-egu2020-7964 ◽

2020 ◽

Author(s):

Ning He

Keyword(s):

Pseudomonas Fluorescens ◽

Batch Fermentation ◽

Soil Bacteria ◽

Metal Removal ◽

Heavy Metal Removal ◽

Environmental Friendliness ◽

Extracellular Polymer Substance ◽

Flocculating Activity ◽

Fermentation Strategy ◽

Extracellular Polymer

<p>Bioflocculants produced by microorganisms have advantages in removing heavy metals because of their environmental friendliness and biodegradability. In this study, the bioflocculant from a soil bacteria was investigated for its application in chromium&#160;(&#8549;)&#160;and&#160;arsenic&#160;(&#8546;) removal. The bioflocculant-producing strain was indentified as Pseudomonas fluorescens. It showed maximum flocculating activity of 2579.94 U/mL and yield of 4.84 g/L under optimal condition. With a fed&#8209;batch fermentation strategy, bioflocculant production was further enhanced by 32.6%. The bioflocculant was as extracellular polymer substance composed of 76.67% polysaccharides and 15.8% protein with a molecular weight of 117 kDa. It showed excellent capacities in heavy metal removal, 80.13 and 45.93 mg/g for chromium(&#8549;) and arsenic (&#8546;), respectively. The bioflocculant outperformed conventional adsorption materials and could represent a promising biotechnology for the remediation of environmental problems.</p>

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Investigation on Heavy Metal Removal from a Crude Oil Contaminated Soil using Rhamnolipid Biosurfactant as a New Eco-Friendly Method

Tenside Surfactants Detergents ◽

10.3139/113.110710 ◽

2020 ◽

Vol 57 (6) ◽

pp. 515-520

Author(s):

Nayyereh Kholghi ◽

Hossein Amani ◽

Shokoufeh Malekmahmoodi ◽

Alireza Amiri

Keyword(s):

Heavy Metal ◽

Crude Oil ◽

Contaminated Soil ◽

Metal Removal ◽

Heavy Metal Removal ◽

Rhamnolipid Biosurfactant

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Author response for "Use of fibroin polypeptide from silk processing waste as an effective biosorbent for heavy metal removal"

10.1002/cjce.23961/v2/response1 ◽

2020 ◽

Author(s):

Yifeng Huang ◽

Muhammad Usman Farooq ◽

Prodip Kundu ◽

Swapnali Hazarika ◽

Xianshe Feng

Keyword(s):

Heavy Metal ◽

Metal Removal ◽

Heavy Metal Removal ◽

Author Response ◽

Processing Waste

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Synthesis, characterization and heavy metal removal efficiency of nickel ferrite nanoparticles (NFN’s)

Scientific Reports ◽

10.1038/s41598-021-83363-1 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Waheed Ali Khoso ◽

Noor Haleem ◽

Muhammad Anwar Baig ◽

Yousuf Jamal

Keyword(s):

Heavy Metals ◽

Nickel Ferrite ◽

Contact Time ◽

Metal Removal ◽

Heavy Metal Removal ◽

Ferrite Nanoparticles ◽

Batch Adsorption ◽

Aqueous Environment ◽

Human Beings ◽

Nickel Ferrite Nanoparticles

AbstractThe heavy metals, such as Cr(VI), Pb(II) and Cd(II), in aqueous solutions are toxic even at trace levels and have caused adverse health impacts on human beings. Hence the removal of these heavy metals from the aqueous environment is important to protect biodiversity, hydrosphere ecosystems, and human beings. In this study, magnetic Nickel-Ferrite Nanoparticles (NFNs) were synthesized by co-precipitation method and characterized using X-Ray Diffraction (XRD), Energy Dispersive Spectroscopy (EDS) and Field Emission Scanning Electronic Microscopy (FE-SEM) techniques in order to confirm the crystalline structure, composition and morphology of the NFN’s, these were then used as adsorbent for the removal of Cr(VI), Pb(II) and Cd(II) from wastewater. The adsorption parameters under study were pH, dose and contact time. The values for optimum removal through batch-adsorption were investigated at different parameters (pH 3–7, dose: 10, 20, 30, 40 and 50 mg and contact time: 30, 60, 90, and 120 min). Removal efficiencies of Cr(VI), Pb(II) and Cd(II) were obtained 89%, 79% and 87% respectively under optimal conditions. It was found that the kinetics followed the pseudo second order model for the removal of heavy metals using Nickel ferrite nanoparticles.

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