To test this design, poly-1 was ground to a fine powder using a motor and pestle before 200 mg was added to a 10 mL solution of AuCl3 in water (100 ppm Au 3+ ). Au 3+ was used as a model gold species as this oxidation state is formed with some oxidative lixiviants. After rotating the mixture for 12 hours at ambient temperature, the gold concentration was measured by atomic absorption spectroscopy (AAS). More than 97% of the gold was captured by poly-1 (Fig. and S85-S86). The polymer-bound gold (a solid) was recovered by centrifugation and then analyzed by energy dispersive X-ray (EDX) spectroscopy. Gold was observed across the polymer surface, which is consistent with the coordination of the trisulfide to the gold salt (Fig. ). Next, the polymer-bound gold was heated to 170 ºC for 12 hours to provoke depolymerization (Fig. ). After this time, the mixture was subjected to reduced pressure (15 mbar) for 3 hours to separate the regenerated monomer from the gold. The monomer was recovered in 70% yield and separated from the concentrated gold. Analytical digestion of the recovered gold with aqua regia and subsequent analysis by AAS indicated quantitative recovery of the gold from the original solution (S87-S89). With a good yield of the recovered monomer, more sorbent could be prepared and re-used, so this is a promising concept in gold sorption from leachates encountered in mining and e-waste recycling. ). After rotating 12 hours, 97% of the gold had been removed from the solution. B) Energy dispersive X-ray (EDX) spectroscopy of the isolated polymer, now bound to gold. Gold, sulfur and carbon are all co-located across the polymer, which was consistent with poly-1 binding to Au 3+ and removing it from the water. C) Heating the complex formed from the polymer and gold (poly-1-Au) resulted in depolymerization and reformation of monomer 1.