Development of a Green Technology for Mercury Recycling from Spent Compact Fluorescent Lamps Using Iron Oxides Nanoparticles and Electrochemistry

TLDR: In this paper, the authors describe a two-step green technique to remove and recycle mercury from spent compact fluorescent lamps (CFLs) using magnetite (Fe3O4) and maghemite (γ-Fe2O3) nanoparticles.

Abstract: The widespread use of energy efficient mercury containing lamps and impending regulations on the control of mercury emissions has necessitated the development of green mercury control technologies such as nanosorbent capture and electrolysis regeneration. Herein we describe a two-step green technique to remove and recycle mercury from spent compact fluorescent lamps (CFLs). The first element included the assessment of capture efficiencies of mercury vapor on magnetite (Fe3O4) and maghemite (γ-Fe2O3), naturally abundant and ubiquitous components of atmospheric dust particles. Around 60 μg of mercury vapor can be removed up to 90% by 1.0 g of magnetite nanoparticles, within a time scale of minutes. The second step included the development of an electrochemical system for the mercury recycling and regeneration of used nanoparticles. Under optimized conditions, up to 85% of mercury was recovered as elemental mercury. Postelectrolysis regenerated iron oxide nanoparticles were used in several sorption–electroly...

Frequently asked questions

Q1. What have the authors contributed in "Development of a green technology for mercury recycling from spent compact fluorescent lamps using iron oxides nanoparticles and electrochemistry" ?

Herein the authors describe a two-step green technique to remove and recycle mercury from spent compact fluorescent lamps ( CFLs ). The first element included the assessment of capture efficiencies of mercury vapor on magnetite ( Fe3O4 ) and maghemite ( γ-Fe2O3 ), naturally abundant and ubiquitous components of atmospheric dust particles. The second step included the development of an electrochemical system for the mercury recycling and regeneration of used nanoparticles. 

Q2. What are the future works mentioned in the paper "Development of a green technology for mercury recycling from spent compact fluorescent lamps using iron oxides nanoparticles and electrochemistry" ?

Further research on detailed chemical speciation and quantification of different compounds, within the electrochemical chambers is recommended. It offers potential to upscale the experiments for future industrial use. In addition, such studies will provide a means for further optimization of recycling system. The mercury adsorption setup is easy to assemble and can be scaled up for potential use in industry by increasing the size of the trap and increasing the mass of sorbent to increase the total adsorption capacity.