Biosequestration of chromium(iii) in an aqueous solution using cationic and anionic biosurfactants produced from two different Bacillus sp. – a comparative study

Abstract

Interaction of cationic biosurfactant with chromium(iii) in an aqueous solution.

A New Biosurfactant/Bioemulsifier from Gordonia alkanivorans Strain 1B: Production and Characterization

“…Biochemical results indicated that the crude powder is mostly constituted by lipids (52.3%) but also presents significant concentrations of proteins (21.25%) and polysaccharides (10.32%). These values are similar to what was described for lipoprotein biosurfactants, in terms of CHN, with a greater percentage of polysaccharides [45,46], indicating that this crude BS/BE can be a lipoglycoprotein.…”

Antifungal potential of biosurfactants produced by strains of Bacillus spp. (Bacillales: Bacillaceae) selected by molecular screening

“…Bodour et al (2003) mention that a small fraction of the microbial community is able to produce biosurfactants unless there is selective pressure. The production of biosurfactants is an important tool for the survival of producing microorganisms, as it increases the bioavailability of hydrocarbons used as a carbon source (Zang et al, 2021) and it acts as a chelating agent, forming insoluble precipitates of toxic heavy metals (Saranya et al, 2015). That is why soils contaminated with organic substances or metals present a higher percentage of surfactant-producing microorganisms, due to selection pressure.…”

Solutions to Hazardous Wastes Issues in the Leather Industry: Adsorption of Chromium Iii and Vi from Leather Industry Wastewaters Using Activated Carbons Produced from Leather Industry Solid Wastes

“…Batch removal percentages of Cr close to 99% and adsorption capacities of the order of 400 mg/g have been obtained (Aravindhan et al, 2004;Elabbas et al, 2016;Fahim et al, 2006;Fonseca et al, 2014;Kuncoro, Soedarti, et al, 2018;Saranya et al, 2015). Sadeek et al, 2015 used rice husk and palm leaf to adsorb copper II, cobalt II and iron III ions in batch solution.…”

“…The tanning process uses trivalent chromium sulphate salts (Cr(OH)SO 4 ) which bond to the proteins, primarily collagen, of the skin or hide forming a complex (Hedberg, 2020). Cr tanning is the most widely used tanning process, as it is less time consuming and produces a high-quality product compared to vegetable tanning (Aravindhan et al, 2004;Cameron & McLaughlin, 1937;Saranya et al, 2015). However, the treatment of tannery waste has always been a serious issue for leather manufacturers due the volume and diversity of waste produced, as well as the complex chemical content and high water content of the waste (Famielec, 2020).…”