Recycling Iron‐Containing Sludges from the Electroflocculation of Printing and Dyeing Wastewater into Anode Materials for Lithium‐Ion Batteries

Abstract

Iron‐containing sludges (DW/Fe) were prepared by the electroflocculation of industrial printing and dyeing wastewater (DW). To investigate the formation process and the properties of the DW/Fe sludges and their application in anode materials in Li‐ion batteries, the DW/Fe sludges were compared to three other sludges (MB/Fe, RB/Fe, Ta/Fe) prepared from model solutions that contained either methyl blue (MB), rhodamine B (RB), or tartrazine (Ta). The DW/Fe sludges were calcined at 500 °C under N2 to form iron oxide/carbon composite C‐DW/Fe. The composition and structure of the sludges and the C‐DW/Fe composite were analyzed by using FTIR spectroscopy, XRD, thermogravimetric analysis, SEM, TEM, and X‐ray photoelectron spectroscopy, and their performances as anodes of Li‐ion batteries were studied by adding different proportions of conductive agent (super P® conductive carbon black). Our results show that the sludges are a complex mixture of Fe3O4 and organic matter. The specific capacity and stability can be improved during the charge–discharge test by increasing the amount of carbon black. Importantly, this improvement is more pronounced on DW/Fe that does not require high‐temperature carbonization, which means that the sludges cannot only protect the environment and avoid the waste of resources but also can be used directly and widely in decentralized energy storage devices.

Study on Treatment of Organic Wastewater from Cutting Fluid by Electro-flocculation-Multiphase Fenton/Ultrasonic System

“…Common demulsification methods include salting out method [3], acid precipitation method [4], coagulation method [5], membrane filtration method [6] and electric demulsification method [7]. Electric flocculation technology has a long history of development in water treatment, and it has been widely used in the treatment of emulsified wastewater [8], printing and dyeing wastewater [9], heavy metal wastewater [10] and other wastewater [11,12]. In the electro-flocculation method, the compound produced by cationic hydrolysis has a strong flocculation effect.…”

Preparation, Characterization and Decolorization Performance of Magnetic Adsorbent Pellets Formed by the Utilization of Electric Flocculation Sludge

“…In recent years, there are some reports about the utilization of electric flocculation waste sludge. Liu et al [17] investigated the application of sludge which were prepared by the electric flocculation of industrial printing and dyeing wastewater in anode materials in Li‐ion batteries. Sharma et al [18] utilized the electrocoagulation‐generated sludge as a partial replacement of cement to manufacture the non‐constructional building blocks.…”