Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 410, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124586
Keywords
Waste recycling; Mercury adsorption; Gold electrodeposition; Activated carbon fiber cloth; Electrothermal swing system
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Funding
- Taiwan Environmental Protection Administration [EPA-109-XB09]
- Ministry of Science and Technology of Taiwan [MOST 108-2218-E-002-068-MY3]
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This study developed a novel electrothermal swing system with gold-electrodeposited activated carbon fiber cloth (GE-ACFC) for adsorbing and recovering low-concentration Hg0, showing that GE-ACFC with an Au growth time of 1200 s had the best Hg0 adsorption performance; the treated GE-ACFC could achieve stable and efficient Hg re-adsorption.
A novel electrothermal swing (ETS) system with gold-electrodeposited activated carbon fiber cloth (GE-ACFC) was developed to adsorb and sustainably recover low-concentration Hg0. GE-ACFC with an Au growth time of 1200 s displayed the largest Hg0 adsorption capacity and >90% removal efficiency. The Hg0 adsorption of GEACFC was dominated by physisorption via Au amalgamation. In contrast, Hg adsorption of untreated ACFC (RAW-ACFC) was mainly controlled by physisorption and chemisorption related to carbonyl groups. Nevertheless, both ACFCs could reach 100% ETS Hg0 regeneration. The Hg re-adsorption of GE-ACFC was stable, with efficiency >90% at different regeneration temperatures in three-cycle ETS experiments, but the Hg re-adsorption efficiencies of RAW-ACFC greatly decreased to only 60% after 250 ? regeneration, due to the formation of electrothermal hot spots in the ACFC. Because the thermal and electrical conductivity of GE-ACFC increased due to Au electrodeposition, the presence of electrothermal hot spots in GE-ACFC-1200s was minor. Simulation results showed that both pseudo-first-order and pseudo-second-order models fitted well to the desorption patterns of the GE-ACFC. Mass transfer model further suggested that intraparticle diffusion control was the rate-limiting step, with diffusion coefficients increased from the first to the third cycle for GE-ACFC.
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