Bacteria encapsulated in layered double hydroxides: Towards an efficient bionanohybrid for pollutant degradation

Interactions between Biological Cells and Layered Double Hydroxides: Towards Functional Materials

“…Recently, such approach was extended to the synthesis of a Pseudomonas sp . strain ADP@Mg 2 Al biohybrid . Typically, a Mg 2+ /Al 3+ nitrate solution is added to a colloidal suspension of bacteria, the pH being maintained constant at 8 by NaOH addition.…”

“…Most studies using LDH as cell supports for the development of functional materials have been carried out with bacterial cells, such as Pseudomonas sp . or Bacillus subtilis ,,,,. LDH compounds has been also applied for harvesting microalgae, a type of eukaryotic cell between 2–10 μm capable of performing photosynthesis.…”

“…For this reason, the scientific community invests a great effort in the development of new and economically viable technologies to reduce, mitigate and eliminate the xenobiotics and pollutants from the environment . Bacterium@LDH biohybrids have been successfully applied in bioremediation as a mechanism of xenobiotics dissipation, such as pesticides or dyes . The mechanisms involved in the bioremediation of a xenobiotic using bacteria@LDH systems are complex and include transport, adsorption‐desorption and biotransformation/mineralization processes of the pollutant.…”

“…Obviously, physico‐chemical properties of the LDH surface have an important role in the biodegradation efficiency. Thus, molar ratio of M 2+ /M 3+ , the hydrophilic nature of LDH surface and the LDH/bacteria ratio are key parameters to be optimized for bacteria@LDH systems ,. Taking into account the best bacteria@LDH biohybrid results obtained for atrazine, the biodegradation rate increased with Mg/Al ratio as follow: Mg 2 Al≫Mg 3 Al>Mg 4 Al, with a multiplying factor of 26 compared with the free ADP for the Mg 2 Al‐LDH at 100 mg/mL of LDH content and 11.6 and 6.2 for Mg 3 Al and Mg 4 Al, respectively.…”

“…Halma et al . showed that a biohybrid ADP@LDH Mg 2 Al‐prepared by direct coprecipitation can be stored for several weeks and reused at least over four cycles, maintaining its biocatalytic activity . Similar results of the potential recyclability of the system Bacillus subtilis @LDH were observed by Liu et al …”