Ukudityaniswa kunye neempawu ezikhanyayo ze-ether-ether cellulose enyibilikayo/i-EU (III)

Synthetic water -soluble cellulose ether/EU (III) kunye nokusebenza okukhanyayo, oko kukuthi, i-carboxymethyl cellulose (CMC)/EU (III), i-methyl cellulose (MC)/EU (III), kunye ne-Hydroxyeyl cellulose (HEC)/EU (III) ixoxa ngobume bezi khompleksi kwaye iqinisekiswa yi-FTIR. I-spectrum yokuphehlelelwa kwezi zinto zihambelanayo yi-EU (III) kwi-615nm. Inguqu yoonopopi yombane (nge-5D0→7F2). Ukutshintshwa kwe-CMC kuchaphazela i-spectrum ye-fluorescent kunye namandla e-CMC/EU (III). Umxholo we-EU (III) nawo uchaphazela amandla e-fluorescent ye-complex. Xa isiqulatho se-EU (III) si-5%(umlinganiselo wobunzima), amandla e-fluorescent ala manzi-enyibilikayo i-cellulose ether EU (III) imatshisi ifikelele kowona mgangatho uphezulu.

Amagama angundoqo: amanzi-ether cellulose enyibilikayo; I-Eu (III); ifaniswe ekhazimlayo

1.Intshayelelo

I-Cellulose yimacrometer yomgca weβ-D iyunithi yeglucose edityaniswe yi (1,4) yotywala. Ngenxa yokuhlaziywa kwayo, i-biodegradable, i-biocompatibility, uphononongo lwe-cellulose luyanda. I-Cellulose ikwasetyenziswa njengekhompawundi ye-optical, umbane, imagnethi, kunye nokusebenza kwe-catalytic njengeqela elisemthethweni le-alkyr oxygen ligand. I-Y.OKAMOTO kunye nabasebenzisana nabo baye bafunda iimvavanyo zokulungiselela kunye nezicelo eziqulethe iipolymers ze-ion metal ezinqabileyo zomhlaba. Baye baqaphela ukuba i-CMC/TB ehambelana necompuer inefluorescent engqukuva eyomeleleyo engqukuva. I-CMC, i-MC, kunye ne-HEC, njengeyona nto ibaluleke kakhulu kwaye isetyenziswa ngokubanzi i-cellulose yamanzi-e-soluble cellulose, ifumene ingqwalasela enkulu ngenxa yokusebenza kwayo okuhle kwe-solubility kunye nexabiso lesicelo esibanzi, ngakumbi iteknoloji yokubhalwa kwe-fluorescent Isakhiwo seselulosi kwisisombululo esinamanzi kakhulu. esebenzayo.

Eli nqaku libika uluhlu lwe-ether ye-cellulose e-soluble yamanzi, oko kukuthi ukulungiswa, isakhiwo kunye neempawu ze-fluorescent ezenziwe yi-matomoid eyenziwe yi-CMC, i-MC kunye ne-HEC kunye ne-EU (III).

2. Linge

2.1 Izixhobo zovavanyo

I-CMC (i-degree of substitution (DS) yi-0.67, 0.89, 1.2, 2.4) kwaye i-HEC ibonelelwa ngobubele yi-KIMA CHEMICAL CO.,LTD.

MC (DP = 450, viscosity 350 ~ 550mpa·s) uveliswa yi-KIMA CHEMICAL CO.,LTD. I-Eu2O3 (AR) iveliswa yi-Shanghai Yuelong Chemical Factory.

2.2 Ukulungiswa kwe-CMC (HEC, MC) /Eu(III)complexes

EuCl3·Isisombululo se-6H2O (isisombululo A): chitha i-Eu2Os kwi-1: 1 (umlinganiselo wevolumu) HCI kwaye uhlambulule kwi-4. 94X 10-2 mol / L.

I-CMC/Eu(III) inkqubo yemeko eqinileyo entsonkothileyo: Nciba i-0.0853g ye-CMC ene-DSs ezahlukeneyo emanzini, emva koko wongeze ubungakanani be-Eu(III) eyehlayo kwisisombululo sayo esinamanzi, ukuze umlinganiselo wobunzima be-CMC:Eu(III) ube yi-19: 1. Gxuma, i-reflux kwiiyure ezingama-24, i-rotary i-evaporate ukuze yome, i-vacuum yomile, igaye ibe ngumgubo nge-agate mortar.

I-CMC (HEC, MC / Eu (III) inkqubo yesisombululo se-aqueous: Thatha i-0.0853 g ye-CMC (okanye i-HEC okanye i-MC)) isampuli kwaye uyinyibilikise kwi-H2O, uze ungeze izixa ezahlukeneyo zesisombululo A (ukulungiselela i-Eu (III) eyahlukileyo ye-Concentration complex. ), ivuselelwe, ishushu kwi-reflux, ihanjiswe kwisixa esithile se-volumetric flask, yongeza amanzi adibeneyo ukuze ahlambulule uphawu.

2.3 I-Fluorescence spectra ye-CMC (HEC, MC) /Eu(III) izakhiwo

Zonke iinkqubo ezintsonkothileyo zamanzi zalinganiswa ngeRF-540 fluorescence spectrophotometer (Shimadzu, Japan). I-CMC/Eu(III) inkqubo ye-slid-state yalinganiswa nge-Hitachi MPE-4 fluorescence spectrometer.

2.4 I-Fourier iguqule i-infrared spectroscopy ye-CMC (HEC, MC) /Eu(III) complexes

I-FTIR IR ye-complex yaqiniswa nge-Aralect RFX-65AFTIR kwaye icinezelwe kwiipilisi ze-KBR.

3. Iziphumo kunye neNgxoxo

3.1 Ukuqulunqwa kunye nokwakhiwa kweekhompleksi zeCMC (HEC, MC) /Eu(III).

Ngenxa yokusebenzisana kwe-electrostatic, i-CMC ikwi-equilibrium kwisisombululo se-aqueous dilute, kwaye umgama phakathi kwamatyathanga e-molekyuli ye-CMC ukude, kwaye amandla ahlangeneyo abuthathaka. Xa i-Eu(III) yongezwa i-dropwise kwisisombululo, i-CMC ye-molecular chains kwisisombululo I-conformational properties zonke zitshintshiwe, ibhalansi ye-electrostatic yesisombululo sokuqala iyatshatyalaliswa, kwaye i-CMC ye-molecular chain ithande ukugoba. Xa i-Eu (III) idibanisa neqela le-carboxyl kwi-CMC, indawo yokudibanisa i-random (1: 16), Ngoko ke, kwisisombululo se-aqueous dilute, i-Eu (III) kunye ne-CMC zilungelelaniswa ngokungenamkhethe kunye neqela le-carboxyl kwikhonkco, kwaye le bonding random phakathi Eu(III) kunye CMC molekyuli imixokelelwane ayilunganga for fluorescence emission strong, kuba Yenza inxalenye indawo chiral zinyamalale. Xa isisombululo sishushu, intshukumo yeCMC yamatyathanga eemolekyuli ikhawuleza, kwaye umgama phakathi kwamatyathanga emolekyuli yeCMC ufinyeziwe. Ngeli xesha, ukudibana phakathi kwe-Eu(III) kunye namaqela e-carboxyl phakathi kwamatyathanga emolekyuli eCMC kulula ukwenzeka.

Olu nxulumano luqinisekisiwe kwi-spectrum ye-CMC/Eu(III) FTIR. Ukuthelekisa ii-curves (e) kunye (f), i-1631cm-1 incopho kwi-curve (f) iyancipha kwi-(e), kunye neencopho ezintsha ezimbini ze-1409 kunye ne-1565cm-1 zivela kwi-curve (e), eziyi-COO - Base vs kunye i-vas, oko kukuthi, i-CMC/Eu(III) yinto yetyuwa, kwaye i-CMC kunye ne-Eu(III) zibotshwa ikakhulu ngamabhondi e-ionic. Kwi-curve (f), i-1112cm-1 i-peak eyenziwe ngokuxutywa kwesakhiwo se-aliphatic ether kunye ne-absorption ebanzi kwi-1056cm-1 ebangelwa isakhiwo se-acetal kunye ne-hydroxyl iyancipha ngenxa yokubunjwa kwee-complexes, kwaye iincopho ezintle zibonakala. . Ii-elektroni ezimbini ze-athom ye-O kwi-C3-O kunye nee-elektroni ezimbini ze-o athom kwi-ether azizange zithathe inxaxheba kulungelelwaniso.

Ukuthelekisa i-curves (a) kunye (b), kunokubonwa ukuba iibhendi ze-MC kwi-MC / Eu (III), nokuba i-oksijini kwiqela le-methoxyl okanye i-oksijini kwindandatho ye-glucose ye-anhydrous, utshintsho, olubonisa ukuba kwi-MC Zonke i-oksijeni zibandakanyeka ekuququzeleleni kunye ne-Eu (III).

3.2 I-Fluorescence spectra ye-CMC (HEC, MC) / Eu(III) iikhompleksi kunye neempembelelo zazo

3.2.1 I-Fluorescence spectra ye-CMC (HEC, MC) /Eu(III) iikhompleksi

Kuba iimolekyuli zamanzi zizicimi ze-fluorescence ezisebenzayo, amandla okukhutshwa kweeyoni ze-hydrated lanthanide adla ngokuba buthathaka. Xa i-Eu (III) i-ion idityaniswe ne-ether ye-cellulose e-soluble yamanzi, ngakumbi nge-polyelectrolyte i-CMC molekyuli, inxalenye okanye zonke ii-athomu zamanzi ezilungelelanisiweyo zingakhutshelwa ngaphandle, kwaye ukukhutshwa kwe-Eu (III) kuya kuphucula ngenxa yoko. I-spectra ekhutshwayo yezi complexes zonke ziqulethe i-5D0→I-7F2 inguqu ye-dipole yombane ye-Eu(III) ion, evelisa incopho ye-618nm.

3.2.2 Izinto ezichaphazela iipropati ze-fluorescence ze-CMC (HEC, MC) /Eu(III) complexes

Iimpawu ze-cellulose ethers zichaphazela ubunzulu be-fluorescence, umzekelo, iikhompleksi ze-CMC/Eu(III) ezenziwe zii-DSs ezahlukeneyo zineempawu ezahlukeneyo ze-fluorescence. Xa i-DS ye-CMC ingekho i-0.89, i-fluorescence spectrum ye-complex ye-CMC/Eu (III) inencopho kuphela kwi-618nm, kodwa xa i-DS ye-CMC i-0.89, ngaphakathi koluhlu lovavanyo lwethu, i-CMC / Eu eqinile ( III) III) Kukho iincopho ezimbini ezibuthathaka zokukhutshwa kwi-spectrum yokukhutshwa, ziyimagnetic dipole transition 5D0→I-7F1 (583nm) kunye nenguqu yombane ye-dipole 5D0→7F3 (652nm). Ukongezelela, ukunyanzeliswa kwe-fluorescence kwezi zinkimbinkimbi nazo zihlukile. Kweli phepha, amandla okukhutshwa kwe-Eu (III) kwi-615nm yenzelwe i-DS ye-CMC. Xa i-DS ye-CMC = 0.89, ukukhanya kokukhanya kwe-Slid-state CMC/Eu(III) kufikelela kubuninzi. Nangona kunjalo, i-viscosity (DV) ye-CMC ayinayo impembelelo kwi-fluorescence intensity ye-complexes ngaphakathi kwendawo yolu phononongo.

4 Isiphelo

Ezi ziphumo zingentla ziqinisekisa ngokucacileyo ukuba ii-complexes ze-cellulose ether/Eu(III) ezinyibilikayo emanzini zineempawu zokukhupha i-fluorescence. I-spectra ekhutshwayo yezi complexes iqulethe inguqu yombane ye-dipole ye-Eu (III), kwaye incopho ye-615nm ibangelwa yiVeliswa yi-5D0.→Inguqu ye-7F2, ubume be-cellulose ether kunye nomxholo we-Eu(III) inokuchaphazela ubunzulu be-fluorescence.