Using novel gold nanoparticles-deposited activated carbon fiber cloth for continuous gaseous mercury recovery by electrothermal swing system
Journal
Chemical Engineering Journal
Journal Volume
431
Date Issued
2022
Author(s)
Abstract
Novel gold nanoparticles (AuNPs) deposited activated carbon fiber cloth (ACFC) was successfully developed in this study. This material showed great potential in combining with an electrothermal swing (ETS) system to sustainably adsorb and recover low-concentration elemental mercury (Hg0) in gas stream. ACFC with Au loading ratio of 0.5 wt% (0.5 wt%-ACFC-THPC) demonstrated the largest Hg0 adsorption capacity. Hg temperature-programmed desorption results suggested that Hg0 was physically adsorbed by AuNPs on Au-ACFC-THPC via amalgamation, while it was both physically and chemically adsorbed by pore structures or carbonyl groups on Raw-ACFC. The Hg0 adsorption efficiency of 0.5 wt%-ACFC-THPC was approximately 95% and remained stable during the cyclic ETS operation under various Hg0 inlet concentrations (30, 75, and 100 ?g m?3); however, the adsorption efficiency of Raw-ACFC greatly decreased to 65–75% as Hg0 inlet concentration increased to 75 and 100 ?g m?3. Furthermore, the regeneration efficiencies of all ACFCs were >90% within 6 min; indicating the promising application in concentrating Hg0 vapor and the subsequent recovery process. Mass transfer models for the simulation of Hg0 desorption within ACFCs were further conducted; the simulation results suggested that intraparticle diffusion dominated the desorption process for both Raw-ACFC and 0.5 wt%-ACFC-THPC. ? 2021 Elsevier B.V.
Subjects
Activated carbon fiber cloth
Electrothermal swing system
Gold nanoparticle
Mercury adsorption
Waste recycling
Activated carbon
Adsorption
Carbon fibers
Efficiency
Fiber optic sensors
Gold nanoparticles
Mass transfer
Pore structure
Recovery
Activated carbon fiber cloths
Adsorption efficiency
Gaseous mercury
Gold Nanoparticles
Inlet concentration
Low concentrations
Wastes recycling
Metal nanoparticles
Type
journal article