Bio- and chemical surfactants for remediation of emerging organic contaminants

Ofon, Utibe A.; Shaibu, Solomon E.; Ndubuisi-Nnaji, Uduak U.; Inam, Edu; Okop, Imeh J.; Enin, Godwin N.; Offiong, Nnanake‐Abasi O.; Ibuotenang, Nnamso D.

doi:10.1016/b978-0-323-90051-5.00023-7

Cited by 3 publications

(2 citation statements)

References 100 publications

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“…Surfactants are a versatile group of chemicals with various applications such as household detergents, personal care products, pharmaceutical, chemical, agricultural agents, oilfield chemicals, food processing agents, industrial additives, environmental remediation agents, among others (Varjani & Upasani, 2017). They are amphiphilic compounds with hydrophilic and hydrophobic moieties that align according to various interfaces of air, water, oil and solid phases and affect the properties of these phases (Lamichhane, et al, 2017;Ofon, et al, 2022). However, chemically synthesized surfactants emerge as organic contaminants of great concern, due to their high toxicity, low biodegradability, causing severe environmental contamination to soil and groundwater, being increasingly recognized as causing serious environmental problems.…”

Section: Introductionmentioning

confidence: 99%

“…However, chemically synthesized surfactants emerge as organic contaminants of great concern, due to their high toxicity, low biodegradability, causing severe environmental contamination to soil and groundwater, being increasingly recognized as causing serious environmental problems. In addition, as surfactants are derived from fossil fuels, production is not sustainable and production costs are subject to the price variation of fossil fuels (Otzen, 2017;Ofon, et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

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Eco-friendly production of biosurfactant by Mucor circinelloides UCP 0018 using agro-industrial substrates

Bione

Lins

Melo

et al. 2022

RSD

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Green bioconversion of low-cost agro-industrial substrates into high-value-added products becomes a biotechnological strategy to enable the production on an industrial scale. In this context, two agro-industrial by-products were used in this study in order to formulate an economic and sustainable media for biosurfactant (BS) production by Mucor circinelloides UCP 0018. For this, a 22 full-factorial design was used to investigate the influence of concentrations of corn steep liquor (CSL) and crude glycerol (CG) on surface tension as response variable. The results showed the ability of this Mucoralean fungus to produce BS under all design conditions, highlighting condition 4 (9% of both substrates) due to the greater reduction in surface tension (from 72 to 29.7 mN/m). Statistical analysis confirmed significant influence of both by-products on surface tension. This BS exhibited excellent emulsifying properties (EI24 98.9%), as well as ODA of 28.26 cm², with burnt motor oil. Preliminary characterization showed the polymeric nature of the biomolecule, with a content of 55.7% of carbohydrates, 28.2% of lipids and 16.1% of proteins, as well as its anionic character and critical micellar dilution (CMD) at 50%. The stability in the range of pH 2-6, temperature 20-80°C and salinity 5-25% evidenced a stable BS, with promising potential of application in several industrial activities or environmental processes in adverse conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Eco-friendly production of biosurfactant by Mucor circinelloides UCP 0018 using agro-industrial substrates

Bione

Lins

Melo

et al. 2022

RSD

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Merging of two droplets at an air-water interface driven by surface tension gradient

Panday,

Darshan,

Bandopadhyay

et al. 2024

Chemical Engineering Science

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Dynamics of a droplet on the surfactant-infested free surface of another liquid

Panday,

Darshan,

Bandopadhyay

et al. 2024

Physics of Fluids

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The dynamics of liquid droplets surfing over the surfactant-infested free surface of another liquid have been explored experimentally. We analyze the motion of oil droplets that has been initiated through the creation of a surface tension gradient resulting from the deposition of a drop of surfactant at the water surface contained in the petri dish. The experiments reveal that the location of surfactant deposition with respect to the droplet position influences its motion. Due to the presence of a surface tension gradient, the footprint area of the droplet reduces and its shape changes. We have studied the temporal variation in the velocity (|vx|) of the droplets in relation to their proximity to a wall. Based on the evolution of droplet shape and change in droplet velocity, the drop dynamics can be experimentally divided into four distinct zones. Results indicate that in zone-1, |vx| grows with t as |vx|≈tn, where n is between 0.8 and 1.0. The scaling argument shows that in this zone, the surface tension force dominates the drag force, and thereby, |vx| of the droplets increases linearly with t expressed as |vx|∝t. The experimental investigation and the scaling law exhibit a reasonable agreement. In zone-2, |vx| remains more or less constant, as it is postulated that the surface tension force balances the drag force. In zone-3, a decrease in surface tension force results in a deceleration of the droplets. In zone-4, the deceleration becomes more prominent as the droplet approaches the petri dish wall.

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Bio- and chemical surfactants for remediation of emerging organic contaminants

Cited by 3 publications

References 100 publications

Eco-friendly production of biosurfactant by Mucor circinelloides UCP 0018 using agro-industrial substrates

Eco-friendly production of biosurfactant by Mucor circinelloides UCP 0018 using agro-industrial substrates

Merging of two droplets at an air-water interface driven by surface tension gradient

Dynamics of a droplet on the surfactant-infested free surface of another liquid

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