Tekinoloje ya Reverse Osmosis (RO) yakopa chidwi kwambiri chifukwa chakugwiritsa ntchito kwake pakuchotsa mchere wa brackish ndi nyanja. Thin film composite (TFC) polyamide (PA) reverse osmosis nembanemba, wopangidwa ndi wandiweyani olekanitsa wosanjikiza ndi porous wosanjikiza wothandizira, akhala mankhwala patsogolo pa ntchitoyi. Komabe, kutsika kochepa kwa nembanemba za PA RO ndi kuyipitsa kwa TFC reverse osmosis nembanemba kumachepetsa kugwiritsa ntchito nembanemba kwa PA RO TFC. googletag.cmd.push(function() {googletag.display('div-gpt-ad-1449240174198-2′);});
Kaphatikizidwe ka nanocomposite nembanemba zatsimikizira kuti ndi njira yabwino kwambiri yophatikizira zabwino za polymeric ndi inorganic nanomaterials. Makhalidwe achilengedwe a nembanemba ya reverse osmosis amatha kuwongolera pokonza bwino kapangidwe kake. Mwachitsanzo, hydrotalcite (HT) anamwazikana mu njira amadzimadzi ndipo anaphatikizidwa PA masanjidwewo pa siteji ya interfacial polymerization kupanga njira zoyendera madzi.
Zotsatira zake zimawonetsa kusinthasintha kwakukulu komanso kuchuluka kwa madzi otuluka popanda kupereka kuthamangitsa mchere. Kuphatikiza apo, kusinthidwa kwa membrane, kuphatikiza kuphatikizika kwa nanoparticle, kuphimba pamwamba, ndi kulumikiza, kwawonetsedwa kuti ndi njira yabwino yopewera biofouling. Mwa iwo, kulumikiza anti-fouling agents pa nanoparticles ophatikizidwa mu PA matrix ndi njira yabwino kwambiri yoperekera zinthu zotsutsana ndi zoyipa kuti zisinthe ma membrane a osmosis popanda kuwononga matrix a PA.
Ma HT nanoparticles ali olemera mumagulu a hydroxyl, omwe amatha kuchitapo kanthu ndi magulu a siloxy a silane coupling agents kuti akwaniritse antifouling grafting. Choncho, buku la TFC reverse osmosis nembanemba yokhala ndi kusankha kwakukulu komanso anti-fouling imatha kupezeka pogwiritsa ntchito HT nanoparticles monga dopants mu PA wosanjikiza ndi kulumikiza odana ndi fouling zinchito gulu munali silane coupling agents pa nembanemba pamwamba.
Prof. Wang Jian wochokera ku Institute of Desalination and Integrated Seawater Utilization, Prof. Ma Zhong wochokera ku Shandong University of Science and Technology, Dr. Tian Xinxia wochokera ku Chinese Academy of Sciences, motsogoleredwa ndi makhalidwe a HT nanoparticles ndi ma silane coupling agents omwe ali ndi quaternary ammonium mchere. , ndi mamembala a gulu lawo pamodzi. Khama lapangidwa kuti pakhale mtundu watsopano wa reverse osmosis membrane wokhala ndi magwiridwe antchito okhazikika kwanthawi yayitali mwa kuwongolera nthawi yomweyo kusankha koyambirira komanso kudana ndi kuipitsidwa.
Ntchito yawo idapititsa patsogolo magwiridwe antchito a TFC PA reverse osmosis membranes ndikupereka upangiri waukadaulo wamtsogolo pakuchotsa mchere m'madzi am'nyanja. Kafukufukuyu adasindikizidwa mu nyuzipepala ya Frontiers of Environmental Science & Engineering.
Mu phunziro ili, Mg-Al-CO3 HT nanoparticles anaphatikizidwa PA wosanjikiza ndi kubalalitsidwa mu njira organic pa interfacial polymerization. Kuphatikizidwa kwa HT kumagwira ntchito ziwiri, kupititsa patsogolo kuyenda kwa madzi ndikukhala ngati malo omezanitsa. Kuphatikizika kwa HT kunachulukitsa kuyenda kwamadzi popanda kupereka nsembe kukana mchere, kubweza zotayika zomwe zidachitika chifukwa cha kulumikizidwa kotsatira. Malo owonekera a HT amakhala ngati malo omezanitsira antifouling agent dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride (DMOT-PAC).
Kuphatikiza kwa HT kuphatikiza ndi DMOTPAC kumezanitsa endows reverse osmosis nembanemba ndi mkulu permeability selectivity ndi anti-fouling katundu. Kuthamanga kwa madzi kwa PA-NT-0.06 kunali 49.8 l / m2 · h, yomwe ndi 16.4% kuposa ya nembanemba yoyambirira. Mlingo wa kukana kwa mchere wa PA-HT-0.06 unali 99.1%, womwe umafanana ndi wa nembanemba yoyambirira. Pankhani zoipa mlandu lysozyme kuipitsidwa, ndi amadzimadzi flux kuchira kwa nembanemba kusinthidwa anali apamwamba kuposa nembanemba choyambirira (mwachitsanzo, 86,8% kwa PA-HT-0.06 ndi 78,2% kwa PA-pachiyambi). Mlingo wa ntchito ya bakiteriya PA-HT-0.06 motsutsana ndi Escherichia coli ndi Bacillus subtilis inali 97.3% ndi 98.7%, motsatana.
Kafukufukuyu ndi woyamba kufotokoza za kupangidwa kwa ma covalent bond pakati pa DMOTPAC ndi HT nanoparticles ophatikizidwa mu matrices a PA kuti apange nembanemba ya reverse osmosis yokhala ndi mwayi wosankha komanso anti-fouling katundu. Kuphatikizidwa kwa ma nanoparticles ophatikizika ndi kulumikiza kwamagulu kumathandizira kuti pakhale ma nembanemba a reverse osmosis okhala ndi kuthekera kwakukulu kosankha komanso anti-fouling katundu.
Zambiri: Xinxia Tian et al., Kukonzekera kwa nembanemba ya reverse osmosis yokhala ndi kusankha kwakukulu komanso anti-fouling katundu wochotsa madzi am'nyanja, Frontiers in Environmental Science and Engineering (2021). DOI: 10.1007/s11783-021-1497-0
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Nthawi yotumiza: Jan-04-2023