Figure 5.

Lead recovery, reusability and magnetic control of GOx-micromotors. (A) Recovery of Pb(II) ions from GOx-microbots after different desorption treatments for 1 h, which were previously employed in decontamination process. (Inset shows SEM image illustrating GOx-microbot tube after the decontamination and desorption (with 0.5 M HNO₃) process. (B) Reusability of GOx-microbots, representing lead decontamination in the first and second cycle. (C) Optical snapshot from a video of GOx-microbot controlled by magnetic guidance after the lead recovery process. (D) GOx-microbot controlled by magnetic guidance swimming in a PDMS microchannel as a prototype system. Experimental conditions for B and C: 1.5% (v/v) of H₂O₂ and 0.1% (w/v) of SDS.