Ib txoj hauv kev tshiab ntawm kev siv cellulose tshem tawm neodymium los ntawm e- khib nyiab tau raug tsim, uas tuaj yeem ua rau rov ua tau zoo dua.
Neodymium xav tau rau kev siv thev naus laus zis xws li tsheb fais fab thiab cua turbines, thiab kev thov rau nws tau nce li ntawm 400 feem pua hauv 20 xyoo dhau los. Txawm li cas los xij, mining no tsis tshua muaj - lub ntiaj teb muaj kev cuam tshuam rau ib puag ncig, xav tau ntau Nd kom rov qab los ntawm e- khib nyiab. Nws txoj kev rov qab los kuj tuaj nrog ntau qhov kev sib tw. Txoj hauv kev tseem ceeb rau kev lag luam rov qab yog cov kuab tshuaj extraction, tab sis txoj kev no yog xaiv tsawg, kim, thiab tsis ruaj khov vim yog siv cov kuab tshuaj lom lom.
Cov kws tshawb fawb ntawm Penn State University tau tsim ib txoj hauv kev tshiab uas siv nanotechnology tshiab los rov qab neodymium los ntawm cov nroj tsuag cellulose. Cellulose yog pheej yig, txuas dua tshiab, thiab muaj ntau. Cov hauj lwm yav dhau los tau ua tiav ntawm cellulose-raws li adsorbents, tab sis cov no tsis muaj txiaj ntsig.
A Penn State team has developed new biotechnology called anionic hair nano cellulose (AHNC), where "hair" refers to cellulose chains attached to the ends of nanoparticles. The hairy layer of the nanoparticle is negatively charged, thereby attracting positively charged Nd ions. This separates Nd from other ions in the aqueous medium, such as iron, calcium, and sodium ions, and aggregates enough Nd particles for efficient recovery.
Amir Sheikhi, assistant professor of chemical engineering and biomedical engineering at Penn State, said: "The process is efficient in terms of removal capacity, selectivity and speed. It can be achieved in seconds by selectively removing elements from some of the tested impurities. Separate the neodymium."
Cov txheej txheem tseem tuaj yeem siv los rho tawm neodymium los ntawm cov dej khib nyiab, mining tailings, thiab cov hlau nplaum ruaj khov uas tsis siv lawm.
"This contribution to rare earth recycling will have a strategic and economically viable impact on several industries," Sheikhi said. "The more neodymium we recycle, the more electric and hybrid cars and wind turbines we can make, reducing the pressure on the environment."
Sheikhi tau hais ntxiv tias tam sim no pab pawg tab tom tshawb nrhiav ntau txoj hauv kev los txhim kho txuas ntxiv lossis ib nrab -batch adsorption systems, uas yuav ua rau txoj hauv kev rau kev txhim kho cov txheej txheem.
