title: Leaching of metals from large pieces of printed circuit boards using citric acid and hydrogen peroxide.
abstract: In the present study, the leaching of metals from large pieces of computer printed circuit boards (CPCBs) was studied. A combination of citric acid (0.5 M) and 1.76 M hydrogen peroxide (H2O2) was used to leach the metals from CPCB piece. The influence of system variables such as H2O2concentration, concentration of citric acid, shaking speed, and temperature on the metal leaching process was investigated. The complete metal leaching was achieved in 4 h from a 4 × 4 cm CPCB piece. The presence of citric acid and H2O2together in the leaching solution is essential for complete metal leaching. The optimum addition amount of H2O2was 5.83 %. The citric acid concentration and shaking speed had an insignificant effect on the leaching of metals. The increase in the temperature above 30 °C showed a drastic effect on metal leaching process.
authors.affiliation: Department of Power Mechanical Engineering, National Tsing Hua University, No. 101, Sec. 2, Kuang Fu Rd, 30013, Hsinchu, Taiwan, Republic of China.
authors.forename: Umesh
authors.initials: U
authors.lastname: Jadhav
authors.affiliation: Department of Power Mechanical Engineering, National Tsing Hua University, No. 101, Sec. 2, Kuang Fu Rd, 30013, Hsinchu, Taiwan, Republic of China.
authors.forename: C
authors.initials: C
authors.lastname: Su
authors.affiliation: Department of Power Mechanical Engineering, National Tsing Hua University, No. 101, Sec. 2, Kuang Fu Rd, 30013, Hsinchu, Taiwan, Republic of China. hochengh@gmail.com.
authors.forename: Hong
authors.initials: H
authors.lastname: Hocheng
mesh_terms: D019343:Citric Acid / Q000737:chemistry*; D059029:Electronic Waste; D006861:Hydrogen Peroxide / Q000737:chemistry*; D008670:Metals / Q000032:analysis*; D013696:Temperature; D018505:Waste Management / Q000191:economics / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D008670:Metals; D014874:Water Pollutants, Chemical; D019343:Citric Acid; D006861:Hydrogen Peroxide
keywords: Citric acid; Hydrogen peroxide; Large printed circuit board piece; Metal leaching