Yeast Extract Affecting the Transformation of Biogenic Tooeleite and Its Stability

Abstract

Highly toxic As(III) is the main form of As in wastewater. The retention of As by tooeleite has gradually attracted attention in recent years due to its great potential for the direct removal of As(III). The existence of natural As-bearing minerals is closely related to microorganisms and organic matters. In this study, yeast extract was found to enhance the stability of biogenic tooeleite by Acidithiobacillus ferrooxidans (A. ferrooxidans). The effects of pH, Fe/As and yeast extract concentration were systematically studied, and the toxicity characteristic leaching procedure (TCLP) was conducted to evaluate the short-term stability of tooeleite. The mineral synthesized in the presence of yeast extract showed that the As leaching concentration decreased from 13.78 mg/L to 7.23 mg/L and the stability increased by more than 40%. In addition, various characteristics confirmed that the precursor was changed from amorphous schwertmannite to basic ferric sulfate in the presence of yeast extract, and then transformed to relatively purer tooeleite with less hollow structure and excellent dispersion, which is favorable for the stability of tooeleite. This result indicated that yeast extract resulted in the formation of different precursors and thus affected the transformation and stability of tooeleite.

The Potential of Clove Rhizospheric Bacteria to Produce Vanillin from Eugenol

“…A study conducted by Hakobyan et al (2012) proved that the addition of this ingredient to the Rhodobacter sphaeroides medium could increase cell growth and photoproduction of hydrogen by the bacterium strain isolated from mineral springs. In addition, another report also stated that yeast extract can increase the stability of biogenic tooeleite by the bacterium Acidithiobacillus ferrooxidans, thereby reducing highly toxic soluble arsenite (III) (Li et al 2022).…”

Enhanced Performance of nZVI/MXene@CNTs for Rapid As(III) Removal from Aqueous Solutions

“…The peak at 815.14 eV was corresponded to the Fe-O-As vibrational peak, indicating that As(III) removal process occurred through surface complexation, as well as solid-phase precipitation by bonding As(III) to Fe [62]. The results suggested that the nZVI/MXene@CNTs retained a good magnetic characteristic, making it suitable for recycling [63,64]. In order to further investigate the adsorption mechanism of nZVI/MXene@CNTs, the XPS analysis was performed before and after the adsorption of As(III).…”

Yeast Extract: Characteristics, Production, Applications and Future Perspectives

“…A recent report stated that the stability of Acidithiobacillus ferrooxidans to the biological source of oil was significantly improved under the action of yeast extract as a culture additive. It reduces the leaching concentration of arsenic (As), a highly toxic waste in acid water, from 13.78 mg/l to 7.23 mg/l, and improves the stability by 40%, which is of great significance to the control of arsenic content [98].…”