Itekhnoloji ye-Reverse Osmosis (RO) itsale ingqalelo enkulu ngenxa yokusetyenziswa kwayo ngokubanzi kwibrackish kunye nokususwa kwetyuwa emanzini olwandle. Thin film composite (TFC) polyamide (PA) reverse osmosis inwebu, equlathe umaleko eshinyeneyo yokwahlula kunye umaleko porous inkxaso, ibe ziimveliso eziphambili kule ntsimi. Nangona kunjalo, ukungeneka okuphantsi kwe-PA RO membranes kunye nokonakala kwe-TFC reverse osmosis membranes kunciphisa ukusetyenziswa okuxhaphakileyo kwe-PA RO TFC membranes. googletag.cmd.push(umsebenzi () {googletag.display('div-gpt-ad-1449240174198-2′);});
I-synthesis ye-nanocomposite membranes ibonakalise ukuba yeyona ndlela ibalaseleyo yokudibanisa izibonelelo zepolymeric kunye ne-inorganic nanomaterials. Iimpawu zendalo ze-reverse osmosis membranes zinokuphuculwa ngokulungelelanisa ukwakheka kunye nokwakheka. Ngokomzekelo, i-hydrotalcite (HT) yachithwa kwisisombululo samanzi kwaye ifakwe kwi-matrix ye-PA kwinqanaba le-polymerization ye-interfacial ukudala iziteshi zokuthutha amanzi.
I-membrane ezibangelwayo zibonisa ukhetho oluphezulu lokungena kunye nokunyusa ukuhamba kwamanzi ngaphandle kokubingelela ityuwa. Ukongezelela, ukuguqulwa kwe-membrane, kubandakanywa ukufakwa kwe-nanoparticle, ukugubungela umphezulu, kunye nokuxutywa, kuboniswe njengendlela esebenzayo yokukhusela i-biofouling. Phakathi kwazo, ukufakela i-anti-fouling agents kwi-nanoparticles efakwe kwi-matrix ye-PA sisicwangciso esihle kakhulu sokubonelela ngeepropathi ezichasayo ukubuyisela umva i-osmosis membranes ngaphandle kokonakalisa i-matrix ye-PA.
I-HT nanoparticles zizityebi kumaqela e-hydroxyl, ezinokusabela kunye namaqela e-siloxy ye-silane coupling agents ukuphumeza i-antifouling grafting. Ke ngoko, inoveli ye-TFC ibuyisela i-osmosis inwebu enokukhetha okuphezulu kunye neempawu ezichasene ne-fouling inokufumaneka ngokusebenzisa i-HT nanoparticles njenge-dopants kuluhlu lwe-PA kunye nokuxhunyelelwa i-anti-fouling esebenzayo equkethe i-silane coupling agents kwi-membrane yomhlaba.
UProf. Wang Jian ovela kwiZiko lokuTyulwa kwetyuwa kunye nokuSetyenziswa kwamanzi oLwandle oluDityanisiweyo, uProf. Ma Zhong ovela kwiYunivesithi yaseShandong yeSayensi nobuChwepheshe, uGqr. Tian Xinxia ovela kwiZiko leeSayensi zaseTshayina, ekhuthazwa ziimpawu zeHT nanoparticles kunye ne-silane coupling agents ezinequaternary. iityuwa ammonium. , kunye namalungu eqela labo kunye. Iinzame zenziwe ukuphuhlisa uhlobo olutsha lwe-membrane ye-osmosis eguquguqukayo kunye nokusebenza kwexesha elide elizinzile ngokuphucula kwangaxeshanye ukukhethwa kwe-permeability yokuqala kunye nokuchasana nokungcola.
Umsebenzi wabo uphucule kakhulu ukusebenza kwe-TFC PA ibuyisela umva i-osmosis membranes kwaye yabonelela ngeengcebiso ezixabisekileyo zobuchwephesha kwikamva lokukhutshelwa kwetyuwa emanzini olwandle. Uphononongo lupapashwe kwijenali yeFrontiers yeSayensi yeNdalo kunye nobuNjineli.
Kule sifundo, i-Mg-Al-CO3 HT nanoparticles ifakwe kwi-PA layer ngokusasazwa kwisisombululo sezinto eziphilayo ngexesha le-polymerization ye-interfacial. Ukufakwa kwe-HT kudlala indima emibini, ukunyusa ukuhamba kwamanzi kunye nokusebenza njengendawo yokuxhunyelelwa. Ukufakwa kwe-HT kwandisa ukuhamba kwamanzi ngaphandle kokubingelela ukugatywa kwetyuwa, ukuhlawulela ilahleko ebangelwa yi-grafting reaction. Umphezulu ovelileyo we-HT usebenza njengendawo yokuxhunyelelwa kwi-agent ye-antifouling i-dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride (DMOT-PAC).
Ukudityaniswa kwe-HT yokufakwa kunye ne-DMOTPAC yokuxhunyelelwa i-endows ibuyisela umva i-osmosis membranes kunye nokukhethwa okuphezulu kwe-permeability kunye neempawu ezichasayo. Ukuhamba kwamanzi kwe-PA-NT-0.06 kwakuyi-49.8 l / m2 · h, eyi-16.4% ephezulu kuneyokuqala kwe-membrane. Iqondo lokugatywa kwe-PA-HT-0.06 ityuwa yayiyi-99.1%, efaniswa naleyo ye-membrane yokuqala. Ngokubhekiselele kungcoliseko olubi lwe-lysozyme, ukubuyiswa kwe-aqueous flux ye-membrane elungisiweyo yayiphezulu kune-membrane yokuqala (umzekelo, i-86.8% ye-PA-HT-0.06 ngokubhekiselele ku-78.2% ye-PA-original). Iqondo lomsebenzi we-bactericidal we-PA-HT-0.06 ngokuchasene ne-Escherichia coli kunye ne-Bacillus subtilis yayingu-97.3% kunye ne-98.7%, ngokulandelanayo.
Olu phononongo lolokuqala ukunika ingxelo yokuqulunqwa kweebhondi ze-covalent phakathi kwe-DMOTPAC kunye ne-HT nanoparticles efakwe kwi-matrices ye-PA ukuvelisa ii-membrane ze-osmosis ezijikelezayo kunye nokukhethwa okuphezulu kunye neempawu ezichasene ne-fouling. Ukufakwa kwe-nanoparticles edibeneyo kunye nokuxutywa kweqela elisebenzayo kwenza ukuba kuphuhliswe i-membrane ye-osmosis e-reverse kunye ne-high permeability selectivity kunye ne-anti-fouling properties.
Ulwazi oluthe vetshe: U-Xinxia Tian et al., Ukulungiswa kwe-membrane ye-osmosis e-reverse enokukhetha okuphezulu kunye neempawu ezichasayo zokuchithwa kwamanzi olwandle, i-Frontiers kwi-Environmental Science and Engineering (2021). I-DOI: 10.1007/s11783-021-1497-0
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Ixesha lokuposa: Jan-04-2023