WEB Lead binding polyelectrolyte multilayer coating based on biogenic polymersWednesday (23.09.2020) 16:10 - 16:25 F: Functional Materials, Surfaces, and Devices 2 Part of:
Background: Lead can be used in different technical applications and can improve the performance of many products. The main disadvantage of lead is its high toxicity. The risk of release of lead due to defects during production or utilization of different applications is high. Due to the high risk potential of lead or lead-containing compounds for humans and the environment, the development of new applications based on materials which include lead is hindered. A wide range of materials has already been tested so far for their ability to selectively bind lead. Here we present a new concept to be used as lead binding coating.
Methods and Results: We developed a new approach based on the layer-by-layer deposition of polyelectrolytes from biological sources to generate an environmentally friendly lead binding coating. The coating has a thickness of less than 10 micrometers and could be successfully built-up on gold, silicon and glass substrates. It is stable even under low pH conditions, as shown by quartz crystal microbalance. Lead-binding functionality was shown after subsequent crosslinking, demonstrating a high binding capacity as evidenced by photometric lead quantification tests and ICP-OES. The lead binding capabilities could be further enhanced by increasing the thickness of the coatings, analyzed both, in the supernatant and the surface of the coated material. The described coating could successfully be transferred onto different substrates and even nonwoven materials with high surface areas, further increasing the lead binding capacity.
Conclusion and Outlook: Due to its inherent thin film characteristics this newly described coating has potential to be applied within perovskite solar cells to absorb lead ions in the occasion of glass breakage, and prevent the release of lead into the environment as well as for lead-ion adsorption from aqueous solutions in the context of water treatment.
Acknowledgment: This work was supported by the Ministry of economy, labour and housing Baden-Württemberg under contract number 3-4332.62-ZSW/55 (SuPerB).