TY - JOUR
T1 - Recycling supercapacitor activated carbons for adsorption of silver (I) and chromium (VI) ions from aqueous solutions
AU - Wu, Feng
AU - Zhao, Tuo
AU - Yao, Ying
AU - Jiang, Tao
AU - Wang, Bing
AU - Wang, Meiling
N1 - Publisher Copyright:
© 2019
PY - 2020/1
Y1 - 2020/1
N2 - In this study, we reported on the recycling of carbon materials from spent commercial supercapacitors and its application as low-cost adsorbent for high-efficiency removal of Ag(I) and Cr(VI) ions from aqueous solutions. Adsorption kinetics and isotherms, and effects of initial pH were carried out to investigate the adsorption performance of the recycled supercapacitor activated carbon (RSAC), whereas a series of characterizations such as SEM, EDX, BET, XPS, XRD and FTIR were employed to detailedly analyse the adsorption mechanism. The RSAC showed maximal adsorption capacity for Ag(I) and Cr(VI) of 104.0 and 96.3 mg g−1, respectively, with adsorbent dosage of 2 g L−1 and initial ions concentration of ∼2000 mg L−1 at room temperature (23 ± 1 °C), and the adsorption was rapid and influenced by the initial pH value. The outstanding adsorption performance of RSAC was attributed to the high specific surface area (1403 m2 g−1) and abundant multifarious oxygenic groups which could participate in the electrostatic attraction and reduction reaction of Ag(I) and Cr(VI) during the adsorption process. Furthermore, the predominate species of the adsorbed toxic Ag(I) and Cr(VI) on the surface of RSAC was metallic silver particle (about 2 μm) and harmless Cr(III), respectively, thus it was possible for further recycling and disposal.
AB - In this study, we reported on the recycling of carbon materials from spent commercial supercapacitors and its application as low-cost adsorbent for high-efficiency removal of Ag(I) and Cr(VI) ions from aqueous solutions. Adsorption kinetics and isotherms, and effects of initial pH were carried out to investigate the adsorption performance of the recycled supercapacitor activated carbon (RSAC), whereas a series of characterizations such as SEM, EDX, BET, XPS, XRD and FTIR were employed to detailedly analyse the adsorption mechanism. The RSAC showed maximal adsorption capacity for Ag(I) and Cr(VI) of 104.0 and 96.3 mg g−1, respectively, with adsorbent dosage of 2 g L−1 and initial ions concentration of ∼2000 mg L−1 at room temperature (23 ± 1 °C), and the adsorption was rapid and influenced by the initial pH value. The outstanding adsorption performance of RSAC was attributed to the high specific surface area (1403 m2 g−1) and abundant multifarious oxygenic groups which could participate in the electrostatic attraction and reduction reaction of Ag(I) and Cr(VI) during the adsorption process. Furthermore, the predominate species of the adsorbed toxic Ag(I) and Cr(VI) on the surface of RSAC was metallic silver particle (about 2 μm) and harmless Cr(III), respectively, thus it was possible for further recycling and disposal.
KW - Activated carbon
KW - Adsorption
KW - Heavy metals
KW - Spent supercapacitor
KW - Wastewater treatment
UR - http://www.scopus.com/inward/record.url?scp=85071115308&partnerID=8YFLogxK
U2 - 10.1016/j.chemosphere.2019.124638
DO - 10.1016/j.chemosphere.2019.124638
M3 - Article
C2 - 31466006
AN - SCOPUS:85071115308
SN - 0045-6535
VL - 238
JO - Chemosphere
JF - Chemosphere
M1 - 124638
ER -
