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Nanoadsorbent materials and methods of use thereof

A shell material and selenium nanotechnology, which is applied to nano-adsorbent materials and their application fields, can solve the problems of reduced ability to capture and remove mercury, insufficient reactivity of adsorbents, and less mercury capture.

Inactive Publication Date: 2016-04-13
EMPIRE TECH DEV LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reduced surface area results in reduced ability to capture and remove mercury
Although the temperature can be lowered to avoid nanoselenium melting, the lower temperature will result in less mercury being captured because the sorbent is less reactive at lower temperatures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: Preparation of Se nanowires with ZnSe shells. Se nanowires (1 g) were dispersed in 5 mL of ethanol and added to a solution containing 50 mL of ZnCl 2 (Zn 2+ The molar ratio between Se and Se is set to 1:1) in a 250mL flask. The mixture was heated to about 80°C to 100°C under vigorous magnetic stirring for 3 hours and then cooled to room temperature. The dark precipitate obtained after centrifugation was further washed with sufficient water and then dried. The obtained composition of Se nanostructured core and ZnSe-containing melt-resistant shell was then dispersed in water on a high-surface-area support structure assisted by sonication, dried, and stored under ambient conditions until use.

Embodiment 2

[0042] Example 2: Using Se nanowires with ZnSe shells to remove Hg from coal combustion flue gas. The composition of Example 1 was adsorbed or absorbed onto filter paper which served as a solid support structure. The filter paper is then inserted into a chimney carrying coal-burning flue gas. Coal combustion flue gas was passed through a support structure comprising Se nanowires with ZnSe shells. A portion of mercury is removed from coal combustion flue gas. Repeated treatment with additional filter papers placed in sequence in the stack path can be used to remove at least 99% of the mercury present in coal combustion flue gas.

Embodiment 3

[0043] Example 3: Removal of Hg from coal-fired flue gas. The composition of Example 1 was adsorbed or absorbed onto activated carbon which served as a solid support structure. The activated carbon is then inserted into the chimney that transports the coal flue gas. Coal combustion flue gas was passed through a support structure comprising Se nanowires with ZnSe shells. A portion of mercury is removed from coal combustion flue gas. Repeated treatments with other compositions containing activated carbon placed sequentially in the chimney path can be used to remove at least 99% of the mercury present in the coal combustion flue gas.

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Abstract

The present invention describes compositions and methods for removing mercury and / or cadmium from samples containing or believed to contain mercury and / or cadmium. A core-shell composition of selenium comprising a selenium nanostructured core and a melt-resistant shell can be used to remove mercury and / or cadmium from high temperature environments.

Description

technical field [0001] The present invention describes methods and sorbents for capturing and removing mercury and / or cadmium from samples. More specifically, the present invention describes nano-selenium-based adsorbents and methods for their preparation and use. Background technique [0002] Mercury is challenging to capture and can travel long distances, causing serious environmental concerns. Various technologies have been developed to capture and remove mercury species in flue gases from coal combustion. In addition to mercury, flue gas has many gas components, such as SO x , NO x , CO 2 , O 2 , HCl and H 2 O et al. The presence of other gases interferes with the reaction of the sorbent with the mercury species, so the sorbent should have very high selectivity and reactivity towards mercury. One such sorbent is selenium or nanoselenium due to the extremely strong mercury-selenium bonding. [0003] For nanoselenium in the form of nanoparticles and nanowires, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/02B01J20/10B82Y30/00B01J20/02B01J20/30B82Y40/00
CPCB01D53/64B01D2251/60B01D2253/1122B01D2253/1128B01D2253/25B01D2253/304B01D2257/602B01D2258/0283B01J20/02B01J20/06B01J20/08B01J20/103B01J20/20B01J20/28007B01J20/28026B01J20/3204B01J20/3236B01J20/3293B82Y30/00B82Y40/00Y10S977/762
Inventor 李光烈
Owner EMPIRE TECH DEV LLC
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