Marcus-Tuned ALD Heavy-Metal Capture and Recovery

PROBLEM: Atomic layer deposition can coat a biosorbent surface with angstrom-precise oxide layers, but a coating that is too thick or too insulating can slow the electron transfer that stabilises a captured metal ion. Marcus theory predicts that transfer rate falls or rises with reorganization energy and driving force, so oxide thickness becomes a tuning knob rather than a neutral protective layer. Capture projects need a way to preserve each ALD recipe, its predicted binding groups, and its measured uptake without losing the link between them.

SOLUTION: Storage Copy Data Management would provide versioned, recoverable copies of ALD recipes, DFT binding predictions, and batch-isotherm results so no capture experiment is lost when a recipe is revised. The capability would keep deposition-cycle counts, precursor steps, and regeneration energy alongside uptake data, making it possible to roll back to an earlier oxide thickness when a newer one underperforms. Low-temperature, water-compatible process variants would be retained as distinct, auditable versions.

EVIDENCE BASIS: Marcus electron transfer — rate depends on reorganization energy and driving force; inverted region; Nobel 1992. DFT (Kohn-Sham) predicts which surface groups bind which metal ions; Hohenberg-Kohn 1964, Kohn-Sham 1965, Nobel 1998. Biosorption isotherms qe = (C0 − Ce)V/m and Langmuir/Freundlich models are textbook DOCUMENTED. Source: Nobel Prize records (1992, 1998); standard textbooks.