Surfactant-assisted enhancement of bioremediation rate for hexavalent chromium by water extract of Sajina (Moringa oleifera) flower

Abstract

A B S T R A C TThe presence of hexavalent chromium in waste water is a serious environmental problem due to its toxicity and carcinogenicity. Bioremediation is an efficient alternative to the conventional chemical methods of treatment. Bioremediation of toxic hexavalent chromium is done by the reduction of hexavalent chromium to relatively less toxic trivalent chromium. In this study, water extract of Sajina flower, which contains different types of reducing components such as sugar, amino acid, is used as reductant and the rate of bioremediation is increased by treatment with anionic and neutral surfactants. Here surfactants are used as catalyst in the bioremediation process. Sodiumdodecyl sulfate (SDS) is found to be the best catalyst. In the absence of surfactants, 60.37% of the total chromium(VI) is reduced within 285 h, whereas the removal percentage increases up to 96.25 and 99.37% in the presence of TX-100 and SDS, respectively, in minimum time.

Modernization of surfactant chemistry in the age of gemini and bio-surfactants: a review

“…46 In our bioremediation laboratory we have witnessed several such experiments which conclude that the mixing of traditional and biosurfactants together affects the rate of metal remediation, enhancing it by several folds. 47,48 5.5. Biomedical eld Because of their bio origins, biological surfactants are extensively useful in biomedical grounds and they are accepted much faster by bio-organisms.…”

Surfactant for better tomorrow: applied aspect of surfactant aggregates from laboratory to industry

“…An another report exhibited that TX-100 and SDS surfactants were used to accelerate the bioremediation rate of hexavalent chromium by the aqueous extract of sugar cane bagasse [58]. In most of the cases, SDS was found to be the best accelerator for efficient and maximum reduction of higher valent metal ions from contaminated water [59]. The application of surfactant or micellar aggregates for isolating heavy metal ions from water is now gaining popularity depending on micellar-enhanced ultrafiltration process where the surfactant selected as charge opposite to the target toxic ions [60].…”

Ultrasonic controllable synthesis of sulfur-functionalized metal–organic frameworks (S-MOFs) and their application in piezo-photocatalytic rapid reduction of hexavalent chromium (Cr)

“…The removal of Cr(VI) from the environment and the protection of human health are urgent issues. Various methods, such as physical (e.g., adsorption, precipitation), chemical (e.g., oxidation–reduction reactions), biological (e.g., bacteria degradation [8] ), and biochar methods [9] , [10] , have been developed to remove Cr(VI) [11] , [12] , [13] . Metal-organic frameworks (MOFs) have gained much attention in various fields due to their structural diversity, tunable porosity, adjustable surface properties, and facile design [14] .…”