Fast Electrochemical Method for Organic Dye Decolorization Using Recycled Li-Ion Batteries

Abstract

In this paper, the application of recycled Li-ion battery spent cathodes (LIB-SC) combined with a NaHCO3/H2O2 system is presented for the first time in the literature as an alternative for the degradation of potentially toxic organic molecules. The model pollutant choice was methylene blue molecule. The spent cathode composition corresponds to LiCoO2, which was proved by the XRD and EDX. Regarding the decolorization of methylene blue solution, the addition of NaHCO3, in comparison with only H2O2, reduces the complete decolorization time by 96%. This reduction occurs because the radical CO 3 . is more stable than OH. In this way, the application of the system proposed in this article is aimed at solving two major global problems: the disposal of cell phone batteries and the pollution of liquid effluents.

Water Electrolysis Anode Based on 430 Stainless Steel Coated with Cobalt Recycled from Li-Ion Batteries

“…15-0806). The presence of both hcp and fcc phases in electrodeposited cobalt also described in the literature [16][17][18][19][20]. No peaks related to the Co(OH) 2 phase were observed, which may be an indication that the cobalt electrodeposition mechanism does not involves this intermediate [20].…”

“…The starting potential was −0.5 V (rest potential). Sweeping in the direct direction is observed an increase of the cathodic current from −1 V. Some studies of cobalt electrodeposition in pH ≥ 4, proposes that the mechanism involves the formation of Co(OH) 2 and the subsequent reduction of cobalt hydroxide to metallic cobalt [17][18][19][20]. Considering the pH used in this study (pH = 3), the presence of other phases, such as Co(OH) 2 , in the cobalt electrodeposit was not expected [20].…”

“…The recycled powder was dried in air for 24 h. A mass of 250.10 g of positive electrodes was dissolved in an aqueous solution containing 470.00 mL of 3.00 mol•L −1 H 2 SO 4 and 30.00 mL of 30% (v/v) H 2 O 2 . The LiCoO 2 acidic dissolution efficiency increases with acid concentration [17][18][19]. The H 2 O 2 reduces the Co 3+ , insoluble in water, to the Co 2+ , soluble in aqueous solution.…”

“…The pH of electrodeposition bath was maintained equal to 3.0 and the cobalt concentration was 1.00 mol•L −1 . This high concentration was chosen to increase the electrodeposition efficiency [16][17][18][19][20].…”

Oxidative decolorization of indigo carmine dye using spent cathode of Li-ion batteries

“…(JCPDS), the identified cathode composition was LiMn2O4. The SEM analysis of the spent cathode (Figure 4) reveals a characteristic morphology [23][24][25][26]. To elucidate the dye adsorption process on the spent cathode surface, zeta potential measurements were conducted (Figure 5).…”