Plasma Treated Active Carbon for Capacitive Deionization of Saline Water

Abstract

The plasma treatment on commercial active carbon (AC) was carried out in a capacitively coupled plasma system using Ar + 10% O 2 at pressure of 4.0 Torr. The RF plasma power ranged from 50 W to 100 W and the processing time was 10 min. The carbon film electrode was fabricated by electrophoretic deposition. Micro-Raman spectroscopy revealed the highly increased disorder of sp 2 C lattice for the AC treated at 75 W. An electrosorption capacity of 6.15 mg/g was recorded for the carbon treated at 75 W in a 0.1 mM NaCl solution when 1.5 V was applied for 5 hours, while the capacity of the untreated AC was 1.01 mg/g. The plasma treatment led to 5.09 times increase in the absorption capacity. The jump of electrosorption capacity by plasma treatment was consistent with the Raman spectra and electrochemical double layer capacitance. This work demonstrated that plasma treatment was a potentially efficient approach to activating biochar to serve as electrode material for capacitive deionization (CDI).

Excellent Diffusive Performance of Cold-Plasma-Exposed Activated Peanut Shell Carbon as an Electrode in Al-Air Batteries

“…It was possible to see the reduction and oxidation peaks, which stand for the anodic and catholic electrocatalytic activity. 37 CV analyses of untreated and oxygen plasma-treated ACPSC are carried out using KOH electrolyte. With a reduced scan rate of 10 mV s −1 , untreated ACPSC has a specific capacitance of 620 F g −1 , while utilizing a rapid scanning rate, it falls to 196 F g −1 .…”

Sustainable Synthesis of Highly Functionalized Activated Carbon using Plasma Technology

“…[35,44,66] However, most researchers have experimented with both parameters under moderate conditions. [38][39]63,67] Optimization of these parameters will pave the way towards the synthesis of a superior AC material that will have a high functional groups content, a high specific surface area, a higher degree of surface porosity, efficient catalytic properties, high capacitance, and enhanced hydrophilic nature. Statistical data of recent studies related to plasma functionalization of AC is summarized in Figure 3.…”

“…It was observed that some researchers have varied treatment time based on the efficiency of the source, i. e. high efficiency‐low treatment time and vice versa [35,44,66] . However, most researchers have experimented with both parameters under moderate conditions [38–39,63,67] . Optimization of these parameters will pave the way towards the synthesis of a superior AC material that will have a high functional groups content, a high specific surface area, a higher degree of surface porosity, efficient catalytic properties, high capacitance, and enhanced hydrophilic nature.…”