Adsorption Behavior of Cobalt onto Saline Soil with/without a Biosurfactant: Kinetic and Isotherm Studies

Narimannejad, Samira; Zhang, Baiyu; Lye, Leonard M.

doi:10.1007/s11270-019-4097-x

Cited by 12 publications

(2 citation statements)

References 37 publications

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“…The kinetics of heavy metal removal were studied over a period of 24 h with the objective of reducing the biosurfactant action time and, consequently, the final cost of applying the bioproduct (Figure 5). The kinetic experiment showed that there was an equilibrium reached in the first 30 min of the test, accompanied by an increasing and constant percentage that reached 50, 70 and 85% for Pb, Zn and Fe, respectively, metal removal at the end of 24 h. According to Narimannejad, Zhang and Lye [60], adsorption dynamics, especially kinetic models, have been used to trace the associated mechanisms and determine the adsorption rate of heavy metals in soil.…”

Section: Static Treatment Of Soil Contaminated By Heavy Metalsmentioning

confidence: 99%

Microbial Biosurfactant: Candida bombicola as a Potential Remediator of Environments Contaminated by Heavy Metals

da Silva,

Santos,

Meira

et al. 2023

Microorganisms

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Industrial interest in surfactants of microbial origin has intensified recently due to the characteristics of these compounds, such as biodegradability and reduced toxicity, and their efficiency in removing heavy metals and hydrophobic organic compounds from soils and waters. The aim of this study was to produce a biosurfactant using Candida bombicola URM 3712 in a low-cost medium containing 5.0% molasses, 3.0% corn steep liquor and 2.5% residual frying oil for 144 h at 200 rmp. Measurements of engine oil tension and emulsification were made under extreme conditions of temperature (0 °C, 5 °C, 70 °C, 100 °C and 120 °C), pH (2–12) and NaCl concentrations (2–12), demonstrating the stability of the biosurfactant. The isolated biosurfactant was characterized as an anionic molecule with the ability to reduce the surface tension of water from 72 to 29 mN/m, with a critical micellar concentration of 0.5%. The biosurfactant had no toxic effect on vegetable seeds or on Eisenia fetida as a bioindicator. Applications in the removal of heavy metals from contaminated soils under dynamic conditions demonstrated the potential of the crude and isolated biosurfactant in the removal of Fe, Zn and Pb with percentages between 70 and 88%, with the highest removal of Pb being 48%. The highest percentage of removal was obtained using the cell-free metabolic liquid, which was able to remove 48, 71 and 88% of lead, zinc and iron from the soil, respectively. Tests in packed columns also confirmed the biosurfactant’s ability to remove Fe, Zn and Pb between 40 and 65%. The removal kinetics demonstrated an increasing percentage, reaching removal of 50, 70 and 85% for Pb, Zn and Fe, respectively, reaching a greater removal efficiency at the end of 24 h. The biosurfactant was also able to significantly reduce the electrical conductivity of solutions containing heavy metals. The biosurfactant produced by Candida bombicola has potential as an adjuvant in industrial processes for remediating soils and effluents polluted by inorganic contaminants.

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Section: Static Treatment Of Soil Contaminated By Heavy Metalsmentioning

confidence: 99%

Microbial Biosurfactant: Candida bombicola as a Potential Remediator of Environments Contaminated by Heavy Metals

da Silva,

Santos,

Meira

et al. 2023

Microorganisms

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“…When a marine oil spill occurs, the oil spill will undergo a series of physical, chemical, and biological process changes (Gong et al, 2014;Narimannejad et al, 2019). In this series of changes, evaporation of oil components is frequently the major process when hydrocarbons are loss from spilled oil (Lee, 2002).…”

Section: Introductionmentioning

confidence: 99%

Temporal and spatial variation of petroleum hydrocarbons and microbial communities during static release of oil pollution sediments

Wang²,

Li³

et al. 2022

Front. Mar. Sci.

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The migration and transformation of the petroleum hydrocarbons from sediments into water columns is an important basis for assessing the impact on marine environment. In this paper, a static release experiment of crude oils from the Bohai Sea was carried out to evaluate the temporal and spatial variation of petroleum hydrocarbons and microbial communities. The results showed C1 phenanthrene (C1-P) can be used as an evaluation index of different crude oils during static release of oil pollution sediments and their trends of the static release were similar. The crude oil with higher C1-P content released C1-P into the water body significantly higher. After 72 hours, the C1-P release degree of crude oil with a smaller viscosity was more obvious. In the crude oil with the smallest viscosity and the higher viscosity, the bacterial phyla abundance increase was greater. And more importantly, the top 10 abundance of the microbial communities in the water columns and sediments appeared partial (3 species) replacement phenomenon. The research results can deep understanding the migration and transformation of the petroleum hydrocarbons from oil pollution sediments and understanding of the interaction between extreme weather events and human activities by incorporating an eco-evolutionary perspective.

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Biosurfactants as an Eco-Friendly Technology in Heavy Metal Remediation

Silva

et al. 2023

Advancements in Biosurfactants Research

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Adsorption Behavior of Cobalt onto Saline Soil with/without a Biosurfactant: Kinetic and Isotherm Studies

Cited by 12 publications

References 37 publications

Microbial Biosurfactant: Candida bombicola as a Potential Remediator of Environments Contaminated by Heavy Metals

Microbial Biosurfactant: Candida bombicola as a Potential Remediator of Environments Contaminated by Heavy Metals

Temporal and spatial variation of petroleum hydrocarbons and microbial communities during static release of oil pollution sediments

Biosurfactants as an Eco-Friendly Technology in Heavy Metal Remediation

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