A Study on Adsorption Kinetics of Antimony onto Coconut Shell Activated Carbon

Abstract

The affecting factors and kinetic characteristics of antimony (Sb) adsoption onto a type of the coconut shell activated carbon were investigated in this study. The results showed that: the Sb adsorption obeyed the pseudo-second-order kinetics equation, and the coefficients of determination (R2) were higher than 0.97, inferring that this process was mainly the monolayer chemical adsorption. With the reduction of the particle size, the adsorption capacity of activated carbon gradually increased. With the increase of temperature, activated carbon adsorption of antimony content increased gradually, but on the whole the temperature had a limited effect on the adsorption of activated carbon. Effect of the solution pH on antimony adsorption onto the activated carbon was mainly divided into the following two stages: with a pH value of 1 to 3, antimony removal rate was about 60%, and with a pH value of 5 to 11, the removal rate was about 20%.

Characterization and Valorization of Humins Produced by HMF Degradation in Ionic Liquids: A Valuable Carbonaceous Material for Antimony Removal

“…This higher degree of functionality is suggested to be the reason for the markedly superior performance observed in the removal of antimony ions from water compared to widely used activated carbon. This finding is important as the removal of this particular wastewater contaminant has been inefficient using conventional or chemically treated activated carbon. , Furthermore, the mild conditions used to form this functional material can lead to energy savings since no activation procedure using steam or chemical treatment is required. This potential application is significant both in terms of the increasing issues of antimony pollution and the likely production of humins as side products in the biorefineries of the future.…”

“…Herein, we show that humins derived from HMF have great potential as a carbonaceous material for the extraction of antimony from wastewater. This is particularly significant as the removal of this particular contaminant has been inefficient using conventional or chemically treated activated carbon. , Furthermore, the mild conditions used to form the humins represent a less energy intensive process than that required for activated carbon, since no activation procedure using steam or chemical treatment is required.…”