Phosphonate-Functionalized Polystyrene Microspheres with Controlled Zeta Potential for Efficient Uranium Sorption

Transcription

1 Elctronic Supplmntary Matrial (ESI) for RSC Advancs. This journal is Th Royal Socity of Chmistry 2016 Supporting Information Phosphonat-Functionalizd Polystyrn Microsphrs with Controlld Zta Potntial for Efficint Uranium Sorption Zhua Zng a, Sn Yang b, Lixia Zhang a, Daobn Hua a,b * a School for Radiological and Intrdisciplinary Scincs (RAD X) & Collg of Chmistry, Chmical Enginring and Matrials Scinc, Soochow Univrsity, Suzhou , China b Collaborativ Innovation Cntr of Radiological Mdicin of Jiangsu Highr Education Institutions, Suzhou , China Tabl of contnts Charactrization mthods S2 Sorption kintics S2 Sorption isothrm.... S2 Figur S1 S3 Figur S2 S4 Figur S3 S4 Rfrncs S5 - S1

2 1. Charactrization mthods 1 H nuclar magntic rsonanc ( 1 H NMR) spctrum of DEVBP was obtaind on a Varian INVOA-400 instrumnt. Th critical micll concntration (CMC) was dtrmind using pyrn as a fluorscnc prob, and th fluorscnc spctra wr rcordd using FLS920 fluorscnc spctromtr at th mission wavlngth of 382 and 371 nm (λ xcitation = 334 nm). Fild-mitting scanning lctron microscopy (FE-SEM) imags wr prformd on a HITACHI S-570 microscop with an acclrating voltag of 15 kv, and nrgy-disprsiv X- ray (EDX) analysis was carrid out with an EDAX-PV 9100 nrgy disprsion X-ray fluorscnc analyzr. Malvrn Ztasizr (632.8 nm, H-N lasr) was usd to dtrmin zta potntial and Z-avrag siz distribution of th nanoparticls. Transmission lctron microscopy (TEM) imags of particls wr obtaind by a FEI Tcnai G20 lctron microscop (120 kv). Th concntration of uranyl ions was masurd by thrmo inductivly coupld plasma mass spctromtr (ICP-MS, Elmnt II). 2. Sorption kintics Th psudo-first-ordr quation is gnrally xprssd as Equation (1) 1 : k1 log( q qt ) logq ( ) t (1) whr q t and q (mg/g) ar th concntrations of uranium at tim t and quilibrium tim (min), rspctivly. k 1 (h 1 ) is th psudo first ordr kintic constant. k 1 and q can b obtaind from th slop and intrcpt of th plot of log (q -q t ) vrsus t, rspctivly (Figur S2A). And th psudo-scond-ordr quation is givn as Equation (2) 2, 3 : t q t 1 t (2) k q q 2 2 whr k 2 (g/mg/h) is th rat constant of th psudo-scond ordr, which can b obtaind from th plot of t/q t against t (Figur S2B). 3. Sorption isothrm Th quilibrium data wr applid to Langmuir and Frundlich isothrm modls. Langmuir modl is rprsntd by Equation (3), which dscribs monolayr sorption basd on th assumption that all th sorption sits hav qual affinity, and that dsorption at on sit dosn t affct an adjacnt sit 4. C 1 C (3) q q b q max max - S2

3 whr q max (mg/g) is th maximum sorption amount (i.. sorption capacity), C (mg/l) is quilibrium concntration of uranium solution, b (L/mg) is th Langmuir adsorption quilibrium constant. And q max and th Langmuir constant b can b calculatd from th linar plot of C /q against C, rspctivly (Figur S3A). Th Frundlich modl can b applid for multilayr sorption and th sorption on htrognous surfacs, which can b xprssd as Equation (4) 5 : 1 log q log K logc (4) F nf Whr n F and K F (mol 1-n L n /g) ar Frundlich constants rlatd to sorption capacity and sorption intnsity, rspctivly, which can b obtaind from th linar plot of log q vrsus log C, rspctivly (Figur S3B). Figur S1. (A) SEM imag, (B) particl siz distribution of polystyrn microsphrs and (C) EDX of sorbnt aftr uranium sorption. (Exprimntal conditions: 0.14 g/l sorbnt (47.2 mv), 1.36 mg/l uranyl ions, K, ph 8.0, K.) - S3

4 Figur S2. (A) Psudo-first ordr and (B) Psudo-scond ordr kintics of uranium (VI) by sorbnts with diffrnt zta potntials (i , and mv). (Exprimnt condition: 28.0 mg sorbnt, 200 ml solution, 1.36 mg/l uranium (VI), ph 8.0, and K.) Figur S3. (A) Langmuir and (B) Frundlich sorption isothrm plots for th sorption of uranium (VI) onto sorbnts with diffrnt zta potntials (i , and mv). (Exprimnt condition: 28.0 mg sorbnt, 200 ml solution, ph 8.0, and K.) - S4

5 Rfrncs (1) Lagrgrn, S., zur thori dr sognanntn adsorption glöstr stoff. K. Svn. Vtnskapsakad., Handl., Band , 4, (2) Ho, Y. S., Rviw of scond-ordr modls for adsorption systms. J. Hazard. Matr. 2006, 136 (3), (3) Ho, Y. S.; McKay, G., Sorption of dy from aquous solution by pat. Chm. Eng. J.1998, 70 (2), (4) Sadghi, S.; Aboobakri, E., Magntic nanoparticls with an imprintd polymr coating for th slctiv xtraction of uranyl ions. Microchim. Acta 2012, 178 (1-2), (5) Frundlich, H., Concrning adsorption in solutions. Zitschrift Fur Physikalisch Chmi--Stochiomtri Und Vrwandtschaftslhr 1906, 57 (4), S5