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Leaching degree* (%) of grafted groups from AMPA (A), 3APPA (B), 6AHPA (C), and APTES (D) grafted Hombikat M311 during the Pd adsorption experiments (cfr. Figure 6). *The leaching degree was calculated based on the phosphorus and silicon concentrations in the eluates after adsorption, measured by ICP-OES.
