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To selectively recycle Ag and Pd from electrolytic wastewater, Modified thiourea simultaneously used chelation and electrostatic force to selectively remove Ag and Pd from electrolytic wastewater. Following Langmuir's algorithm and the maximum adsorption capacity of Ag and Pd were achieved by 83. 33 and 152. 81 mg g sorbent, respectively where Pseudo-first order model demonstrated the adsorption kinetics. Ag and Pd can be fully recovered in 120 minutes using 0. 5 M thiourea—0. 001 M HNO3 and 1 M thiourea—4 M HCl after the adsorption of Ag and Pd. Ag and Pd's adsorption capacity increased 31. 83 3. 8 percent and 712 11. 22%, respectively, relative to initial hydrogel. ATU-PEGDA produced 111. 34 and 263. 79 mg g sorbent in Ag and Pd adsorption capacity over ten consecutive adsorption-desorption cycles. ATU-PEGDA hydrogel's Chromism of Ag and Pd was a key to determine adsorption saturation and completely desorption of Ag and Pd.
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