Ferrous sulfide-containing passivator for removing heavy metal from soil and preparation method and use thereof

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United States of America Patent

PATENT NO 12083491
APP PUB NO 20230068171A1
SERIAL NO

17891170

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Abstract

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A method for preparing the ferrous sulfide-containing passivator includes: dissolving a sulfide in an alkaline solution to form a mixed solution with a pH of 12-13; adding sodium silicate to the mixed solution and stirring for 0.5-1 hour at 20-40° C.; adding an aqueous solution of ferrous salt to the mixed solution containing sodium silicate, and allowing to react at 40-60° C. for 2-3 hours; where, with decrease of the pH of the mixed solution, sodium silicate is converted into silica nanoparticles, and the ferrous salt reacts with the sulfide to form ferrous sulfide; and further adding an aqueous solution of an organic modifier, and allowing to react at 40-60° C. for 1-2 hours to form a passivator slurry including surface-modified ferrous sulfide doped with silicon dioxide; filtering the passivator slurry to form a passivator.

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Patent Owner(s)

Patent OwnerAddress
HENAN UNIVERSITY450000 NO 379 NORTH SECTION OF MINGLI ROAD ZHENGDONG NEW DISTRICT ZHENGZHOU CITY HENAN PROVINCE ZHENGZHOU CITY HENAN PROVINCE 450000
ENGINEERING RESEARCH CENTER FOR NANOMATERIALS CO LTDSCIENCE AND TECHNOLOGY INDUSTRIAL PARK JIYUAN 454650

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Li, Chaoran Kaifeng, CN 18 14
Li, Xiaohong Kaifeng, CN 96 551
Lian, Mingming Kaifeng, CN 1 0
Song, Chunpeng Kaifeng, CN 1 0
Zhang, Zhijun Kaifeng, CN 78 1229

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