Preparation method of La(OH)3 nanorod coated walnut shell biochar composite
US11633711B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2020 |
| Grant date | Apr 25, 2023 |
| Priority date | — |
| Expiry date | Aug 5, 2041 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2305/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to a preparation method of La(OH)3 nanorod/walnut shell biochar composite material (LN-WB), comprising the following steps: putting walnut shell powder into a crucible and pyrolyzing and carbonizing in a muffle furnace at 350° C. to 450° C.; after the pyrolysis is completed, grinding and sieving the obtained biochar, and then repeatedly washing with deionized water; drying the washed biochar for later use; putting an appropriate amount of biochar into the deionized water to form a turbid solution; simultaneously dropwise adding LaCl3 and NaOH to the above turbid solution by using a peristaltic pump; and allowing the obtained mixture to stand at room temperature for 20 to 30 h, washing and drying for later use. The present invention successfully prepares a La(OH)3 nanoparticle-loaded biochar composite material through a simple synthesis technology.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.