Adsorption of gaseous elemental mercury with activated carbon impregnated with ferric chloride

Abstract

Fe-based modified activated carbon prepared by impregnation was used for adsorbents in Hg 0 purification.The influence of carriers, active components, FeCl 3 solution concentration and calcination temperature, were investigated for Hg 0 adsorption purification. The effects of the preparation conditions on the adsorbent were characterized by N 2 adsorption-desorption isotherms, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and (FTIR). The samples modified with FeCl 3 showed an obvious performance for Hg 0 removal, because the chlorine in metal chlorides acts as an oxidant that promotes the conversion of elemental mercury (Hg 0 ) into its oxidized form (Hg 2+ ). The mechanisms of mercury adsorption onto the Cl-impregnated activated carbon were proposed. The optimal conditions for adsorptive purification are an Fe 3+ concentration of 0.15 mol L À1 , calcination temperature of 300 C at an adsorption temperature of 40 C and carrier gas flow rate of 300 mL min À1 .

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

“…It has been well-demonstrated that introduction of oxygen functionalities onto carbon materials is a promising strategy to enhance its adsorption capacity of heavy metal ions. [21][22][23][24] Aer activation in either gas or liquid phase with oxidants/reductants, the post-oxidation/reduction treatments of commercial activated carbon or carbon materials have been successfully applied to increase the surface oxygenated groups, eventually promoting adsorption ability. These modication techniques not only involve time-consuming and additional processes, but also lead to a drastic reduction of the total basic groups, such as the chemical treatments with H 2 O 2 , 25 HNO 3 , 26 (NH 4 ) 2 S 2 O 8 , 27 and O 3 .…”

Adsorption of Gaseous Elemental Mercury by Ferric‐Chloride‐Modified Activated Carbon Under Low‐Temperature Conditions

“…First, Hg 0 was absorbed on the AC surface to form Hg 0 (ad). Then, HgCl 2 generated through Hg 0 (ad) reacted with CCl group . The reactions are given as follows: …”

A simple determination of trace mercury concentrations in natural waters using dispersive Micro-Solid phase extraction preconcentration based on functionalized graphene nanosheets

“…Indeed, a large amount of nanoparticles suspension leads to an increase in the blanks signal. The graphene shows similar properties to activated carbon so it can adsorb the gaseous species of mercury present in the air during the preparation of the nanoparticles suspension [38][39][40]. This could lead to the contamination in the blanks, making necessary to work under a clean atmosphere and to minimize the amount of nanoparticles suspension.…”