Efficient Removal of Chromium(VI) Using a Novel Waste Biomass Chestnut Shell-Based Carbon Electrode by Electrosorption

Abstract

Biomass-derived porous carbon materials have a good application prospect in electrosorption because of their low cost, abundant natural resources, and excellent performance. In this work, three-dimensional interconnected structure porous carbon (CPC) was successfully synthesized from waste biomass chestnut shells by carbonization and chemical activation processes. The unique structure of CPC could offer superior double-layer capacitance and excellent conductivity. The as-obtained CPC was applied as an electrosorption electrode. In the deionization experiments, the removal efficiency of the CPC electrode in a 30 mg L–1 chromium­(VI) aqueous solution at 1.0 V was 90.5%. The electrosorption follows pseudo-second-order kinetics. The CPC electrode also presented good regeneration performance in the regeneration test. These results demonstrate that the as-prepared carbonaceous material is an ideal material for capacitive deionization electrodes.

Fabrication of Hierarchical Lignin-Based Carbon through Direct High-Temperature Pyrolysis and Its Electrochemical Application

“… 30 The hierarchical and interconnected pore structure of ALC, i.e., high graphitization and high mesopore volume (0.74 cm 3 ·g –1 ), could better enhance capacitive deionization performance and form a good ion transfer pathway to shorten the ion diffusion distance, thus accelerating ion transport. 35 …”

“…Electrode conductivity and ion diffusion are greatly important for the capacitance and capacitive deionization performances of electrode materials Figure d shows that the EIS curve of Nyquist plots over the frequency range indicated a semicircle in the high-frequency range and a straight line in the low-frequency range.…”

“…30 The hierarchical and interconnected pore structure of ALC, i.e., high graphitization and high mesopore volume (0.74 cm 3 •g −1 ), could better enhance capacitive deionization performance and form a good ion transfer pathway to shorten the ion diffusion distance, thus accelerating ion transport. 35 Electrochemical Performance. To reveal the electrochemical properties of ALC, the electrochemical performances of cyclic voltammetry (CV), galvanostatic charging/discharging (GCD), and electrochemical impedance spectroscopy (EIS) were measured in a three-electrode system.…”

Graphene‐Oxide‐Coated, Polypyrrole‐Supported, Nano Zerovalent Iron Nanocomposites for Adsorption of Hexavalent Chromium from Wastewater

“…[12,13] Long-term exposure to hexavalent chromium more than the permissible limit can cause nausea, nervous disorder, kidney failure, liver diseases, and cancer. [14,15] The various technologies developed for Cr (VI) removal from water or wastewater streams include chemical precipitation, [16] ion exchange, [17] bioremediation, [18] photocatalytic reduction, [19] electrokinetic, [20] remediation membrane separation, [7] electrodialysis, [21] and adsorption. [22] Among these, the adsorption method is widely used in the cleaning of Cr (VI) contaminated water due to its wide range of raw materials and no by-products, easy recovery, simple operation, and high efficiency.…”

Removal of Hexavalent Chromium(VI) from Wastewater Using Chitosan-Coated Iron Oxide Nanocomposite Membranes

“…For years, many methods have been reported for the removal of Cr(VI), such as electrochemical treatment [9][10][11], reverse osmosis [12,13], photocatalytic reduction [14], ion exchange [15,16], and adsorption [17][18][19][20][21]. Among them, the adsorption method has the advantage of a simple and fast removal process and thus, it has high potential for removing chromium ions from wastewater.…”