One-step preparation of functionalized cotton exocarp-based sorbent for efficient Hg0 immobilization

Duan, Xuelei; Yuan, Chun-Gang; Jing, Tian-Tian; Yuan, Xiaoping

doi:10.1007/s42823-021-00263-0

Cited by 1 publication

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“…However, due to the high cost and poor efficiency of commercial activated carbon for mercury removal, application of AC is limited. For the question above, we prepared corn cob activated carbon, Arachis hypogaea Linn activated carbon and cotton exocarp activated carbon, developing a new way for agricultural waste utilization, realizing high mercury adsorption efficiency from simulated flue gas (>91%), benefiting the implementation of a dual carbon strategy in China. ,, Though the prepared bioactivated carbon released the pressure of cost, the limited adsorption capacity and recontamination issue limit the application of the carbon-based materials. Thus, we know that the preparation of composites for Hg 0 removal must meet three requirements: low cost, outstanding capture capacity, and no secondary pollution.…”

Section: Introductionmentioning

confidence: 99%

Microwave Enhanced Solidification of Gaseous Mercury from Flue Gas by a Novel Selenium Functional FeCo-LDH Based Halloysite Adsorbent

Cao,

Duan,

Bian

et al. 2024

Energy Fuels

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The immobilization of Hg 0 and detoxication of Hgcontaining composites are enormous challenges for Hg pollution control, which provide a high requirement for the design and synthesis of materials. Herein, a new composite with halloysite, selenium, and transition metals as raw materials (FeCo-LDH/ HNTs@Se) for a Hg 0 trap was designed by precipitation with ion exchange and an in situ selenization method. Intrinsic features such as high affinity, microwave permittivity (10 9 −10 12 ), large surface area, abundant pores, and many active components favored Hg 0 removal and immobilization. The removal performance, flue gas tolerance, and synergistic effect of active components were improved greatly when microwave was added. The study indicated that (1) the Hg 0 removal efficiency of the composite could reach 99.4%; (2) the composite had excellent tolerance to different industries' flue gases. The electron exchange of Co(II)/Co(III) and Fe(II)/Fe(III) and the existence of Se and SeO 2 were important for Hg 0 immobilization. HgSe was the main adsorption product based on both X-ray photoelectron spectroscopy (XPS) and an online lab-built thermal decomposition system (TPD-AFS) analysis, which made the used-materials possess low mercury leaching content (0.09 mg•L −1 ) lower than the US EPA regulatory value (0.2 mg•L −1 ). This work provides a sound way for mercury control, which is significant for environmental protection.

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Section: Introductionmentioning

confidence: 99%