کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
581285 | 1453158 | 2009 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electrochemical reclamation of silver from silver-plating wastewater using static cylinder electrodes and a pulsed electric field
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
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چکیده انگلیسی
Silver was reclaimed from silver-plating wastewater by using a pulsed electric field (PEF) combined with static cylinder electrodes (SCE). The conditions that produced the maximal silver recovery rate (RRAg) (99%) were as follows: average retention time of 10 min, interelectrode gap of 50 mm, solution pH of 9.0, temperature of 45 °C, initial Ag(I) concentration of 1000 mg Lâ1, PEF pulse frequency of 1200 Hz, current density of 5.0 A mâ2 and a pulse duty cycle of 60%. Compared with the conventional direct current (DC) technology, the PEF process exhibited improvements in the silver recovery rate (RRAg), total energy consumption (TEC) and physical properties of the silver deposits, especially for low Ag(I) concentrations, for example, from 500 to 1000 mg Lâ1. For an initial Ag(I) concentration of 500 mg Lâ1, the PEF process produced an RRAg of up to 99%, and the TEC was 4.56 kWh (kg Ag)â1. In comparison, the RRAg and TEC were 90% and 5.66 kWh (kg Ag)â1, respectively, in the DC process. The results of SEM observation and XRD analysis indicated that the silver deposits formed by the PEF process were smaller, denser, and of a higher purity than those produced by the DC process. Therefore, the presented method was effective for reclaiming silver from silver-plating wastewater.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 170, Issues 2â3, 30 October 2009, Pages 1164-1172
Journal: Journal of Hazardous Materials - Volume 170, Issues 2â3, 30 October 2009, Pages 1164-1172
نویسندگان
Yuan-bo Su, Qing-biao Li, Yuan-peng Wang, Hai-tao Wang, Jia-le Huang, Xin Yang,