Eco-friendly synthesis of activated carbon from dead mango leaves for the ultrahigh sensitive detection of toxic heavy metal ions and energy storage applications

Abstract

A novel spherical carbon nanoparticle decorated activated carbon (SNAC) material with a high surface area of about 1555 m 2 g À1 is prepared from the dead mango leaves by an eco-friendly method for the detection of toxic heavy metal ions and energy storage applications. The limits of detection (LODs) for the determination of Cd(II), Pb(II), Cu(II), and Hg(II) ions at the SNAC-modified GCE are 24.4 Â 10 À9 M, 5.7 Â 10 À9 M, 23.2 Â 10 À9 M and 24.6 Â 10 À9 M, respectively. On the other hand, the obtained maximum specific capacitance for the single electrode from galvanostatic charge discharge is 478 F g À1 at 1 A g À1 . The symmetric supercapacitor cell provides a higher specific capacitance (SC) of 55 F g À1 at 1 A g À1 , and energy density of 10.75 W h kg À1 at a power density of 300 W kg À1 .

Breakthrough adsorption studies of mixed gases on mango (Mangifera indicaL.) seed shell derived activated carbon extrudes

“…Many CO 2 selective sorbents that are decorated with amine 48 functionalization and N 2 -doping on carbon as well as MOFs [12] 49 have been well-documented [13]. 50 Activated carbon and carbon nanotubes have been studied 51 intensively as adsorbent due to high surface area and porosity. 52 Activated carbon can be derived by many ways either by physical or 53 chemical activation [14][15][16] and microwave treatment [17].…”

Carbohydrate-based activated carbon with high surface acidity and basicity for nickel removal from synthetic wastewater

“…Adsorption onto functional porous carbon materials, especially activated carbon, is very simple and effective way for eliminating undesirable metal ions from contaminated water. [11][12][13] For a given adsorbate, both porous texture and surface chemistry of activated carbon have distinct effects on its adsorption capacity and rate toward.…”

Mechanochemical preparation of graphene nanosheets and their supercapacitor applications

“…The specific capacitance of graphene electrodes is lower at high current density and higher at low current density (Fig. 4(c)) and is due to the following reason: at higher current density, the electrolyte ions are not able to access the inner surface of the electrode material due to time restrictions whereas at low current density, the electrolyte ions possess enough time to adsorb/desorb at the inner and outer surface of the active material [19]. A specific capacitance of about 169.16 F/g is obtained for the graphene electrodes at a constant discharge current density (1 mA/cm 2 ).…”

“…It shows that the discharge time is high for a lower current density suggesting the larger of amount charges stored in electrode material. At higher current densities, the discharge time is low which can be due to the limited access of electrolyte ions [19]. The specific capacitance of graphene electrodes is calculated from the galvanostatic discharge profiles using the relation given below [20]:…”