Printed Circuit Boards waste has been confirmed contained precious metal like gold. Gold from PCB waste can be separated using H2O2-H2SO4 to reduce nonprecious metal and continued by microwave-assisted aqua regia leaching to improve the yield of HAuCl4. HAuCl4 has been purified by an adsorption-desorption process using Mg/Al- Hydrotalcite. Based on Mg and Al mole fraction and analysis of water content, the empirical formula of Mg/Al hydrotalcite is Mg0.5173Al0.4827(OH)2(NO3)0.4827•0.5072H2O. Gold nanoparticles have been synthesized using glutamic acid and trisodium citrate. Surface plasmon resonance of gold nanoparticles has been characterized using UV-Vis spectroscopy.

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