The temperature-responsive Pd²⁺-selective crown ether (Dithia-B18CE6) and N-Isopropylacrylamide (NIPAM) polymer brushes were grafted via SI-ATRP on the acid-stable multi-walled carbon nanotube (MWCNT) support material and was utilized as a Pd²⁺-selective adsorbent. The temperature-responsive composite adsorbent was characterized and tested to determine its Pd²⁺ adsorption capacity and kinetics. The adsorbent has high selectivity towards Pd²⁺ as compared to other cations present in the simulated catalytic converter leachate solution. Recyclability experiment was done by temperature-swing adsorption-desorption cycles for the capture and release of Pd²⁺. The results demonstrate that the Pd²⁺-selective temperature-responsive adsorbent is effective and suitable for the recovery of Pd²⁺ from highly acidic sources.