Removal of mercury(II), lead(II) and cadmium(II) from aqueous solutions using Rhodobacter sphaeroides SC01

Düz

Kahramanmaraş Sütçü İmam Üniversitesi Tarım Ve Doğa Dergisi

et al. 2022

Water is an important part of the ecosystem for life. With industrialization, pollution in water resources has reached a worrying level. Water pollution due to heavy metals and their increasing concentrations have caused researchers to increase their interest in the subject due to the damage they cause to water ecosystems. It requires serious cost and time to eliminate the pollution caused by heavy metals in water. In recent years, the use of biosorption method using bacteria to remove heavy metals in water has become widespread. The main reason why this method is preferred is that gram-positive bacteria have a thick peptidoglycan layer on the cell wall and increases the adsorption capacity. In this study, in drinking, waste, river water and artificially prepared samples, batch method of heavy metal biosorption and biosorption competition in multiple prepared heavy metal solutions were investigated. For these processes, Bacillus licheniformis sp. Bacillus subtilis sp. and Bacillus subtilis (ATCC 6051) strains were used as a biosorbent. Biosorbtion of Cd (II), Cu (II), Pb (II), Fe (II), Ni (II) and Zn (II) metals from waters with these biosorbents at different pHs at 25 ° C with 0.25 mg L -1 It was investigated. Surface morphological structures of biosorbents were evaluated using SEM images and element compositions were evaluated using EDAX profile. Element content was determined using ICP-OES. It was found that heavy metal ions were removed up to 98% with maximum biosorption at pH 6.0.

Section: Sem-edax Micrographssupporting

confidence: 88%

“…It has been reported in the biosorption studies that Cd and Pb ions are largely adsorbed (Abedinzadeh et al, 2020;Mwandira et al, 2020). It has been stated in studies that bacteria are more resistant to Pb and Cd stress (Su et al, 2020;Borralho et al, 2020). (Pratush, 2018;Zhao et al, 2019).…”

Section: Biosorption Studiesmentioning

confidence: 99%

Removal of Heavy Metals in Water with Biosorbtion Method Using Different Biosorbents

Düz

Kahramanmaraş Sütçü İmam Üniversitesi Tarım Ve Doğa Dergisi

et al. 2022

“…Antioxidant enzymes are highly expressed in organisms, including PNSB, under environmental stressors, such as light, oxygen, and pollutants, to eliminate damage caused by excess reactive oxygen species production ( Zhang et al, 2012 ; Su et al, 2020 ). In this study, the activities of intracellular antioxidant enzymes, namely SOD and CAT, were determined in PNSB treated with 5 mM [C n mim]Br.…”

Section: Resultsmentioning

confidence: 99%

Rhodobacter sphaeroides as a model to study the ecotoxicity of 1-alkyl-3-methylimidazolium bromide

Liu

Chen

Jiang

et al. 2023

Front. Mol. Biosci.

The purple non-sulfur bacterium Rhodobacter sphaeroides was selected as a biological model to investigate its response to the toxicity of 1-alkyl-3-methylimidazolium bromide ([Cnmim]Br), a type of ionic liquid (IL), with different alkyl chain lengths (n describes the number of carbon atoms in the alkyl chain). The inhibition of bacterial growth by [Cnmim]Br was positively correlated with n. Morphological characterization revealed that [Cnmim]Br caused cell membrane perforation. The signal amplitude of the electrochromic absorption band shift of endogenous carotenoids showed a negatively linear correlation with n, and the amplitude of the blue-shift of the B850 band in light-harvesting complex 2 showed a positively linear correlation with n. Furthermore, an increase in blocked ATP synthesis and increase in antioxidant enzyme activity were observed in chromatophores treated with ILs containing longer alkyl chains. In summary, the purple bacterium can be developed as a model to monitor ecotoxicity and examine the mechanism of IL toxicity.

Photochem Photobiol Sci

“…Interestingly, analysis of the DNA extracted from the biofilm revealed that the majority of the species belonged to the genus Rhodobacter [29]. Recently, the excellent capability of R. sphaeroides to remove Pb was reported by Su et al, who compared the removal efficiency of Pb, Hg, and Cd from aqueous solutions [30]. R. sphaeroides SC01 achieved 98% removal of Pb in solutions containing 160 mg L −1 of Pb 2+ , showing a remarkably higher resistance − and H 2 O 2 ) was obtained, together with higher enzymatic antioxidant activity, indicating that the strain has both high resistance and high removal efficiency for Pb through regulating the antioxidant system and the formation of precipitates.…”

Section: Metal Removalmentioning

confidence: 99%

The periodic table of photosynthetic purple non-sulfur bacteria: intact cell-metal ions interactions

Grattieri

Labarile

Buscemi

et al. 2021

Photosynthetic purple non-sulfur bacteria (PNB) have been widely utilized as model organisms to study bacterial photosynthesis. More recently, the remarkable resistance of these microorganisms to several metals ions called particular interest. As a result, several research efforts were directed toward clarifying the interactions of metal ions with PNB. The mechanisms of metal ions active uptake and bioabsorption have been studied in detail, unveiling that PNB enable harvesting and removing various toxic ions, thus fostering applications in environmental remediation. Herein, we present the most important achievements in the understanding of intact cell-metal ions interactions and the approaches utilized to study such processes. Following, the application of PNB-metal ions interactions toward metal removal from contaminated environments is presented. Finally, the possible coupling of PNB with abiotic electrodes to obtain biohybrid electrochemical systems is proposed as a sustainable pathway to tune and enhance metal removal and monitoring. Graphic abstract