High‐Temperature Reduction of Calcium Alginate to Carbon Sphere for Efficient Removal of Bivalent Cadmium

Abstract

A carbon sphere was synthesized by high temperature reduction using alginate as a carbon source. The material was characterized by Fourier transform infrared spectrometer, X-ray diffraction, scanning electron microscopy and energy dispersive analysis. The carbon sphere is reticulated and porous at the microscopic level. For Cd(II) removal experiments, the results showed that the carbon sphere had an excellent effect for the remove of Cd(II), and the adsorption obeyed pseudo-secondorder kinetic model and the Langmuir adsorption isotherm model. The adsorption capacities of Langmuir isotherm were 149, 167, 196 mg⋅g À 1 at 288 K, 298 K and 308 K, respectively. In general, the carbon sphere has a good application prospect for treating cadmium-containing wastewater.

Improved Removal of Cr(VI) using Fe3O4/C Magnetic Nanocomposites Derived from Potassium Fulvic Acid

“…Heavy metals are widely used in electroplating, smelting, chemical industry and other industries, and their applications promote the rapid development of industrialization . However, wastewater containing heavy metal ions is discharged into rivers and infiltrated into groundwater, which will cause serious damage to human health and ecosystems .…”