When, Ti(IV)-Fe(III) and Ti(IV)-Zr(IV) binary mixtures were passed through the column at ph

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Virginia Cordelia Pope
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1 Electronic Supplementry Mteril (ESI) for RSC Advnces. This journl is The Royl Society of Chemistry 2014 Supplementry dt: The distribution co-efficient (K d ) t different ph hs been computed (eq. 2) nd the effect of ph on log K d of Ti(IV) between the dsorbent nd solution is depicted in (Fig 7). ml K d g 1 = C s g g 1 / C sol g ml 1 (eq. s1) Here, C s nd C sol re respective concentrtions of Ti(IV) in the solid phse nd in solution phse. seprtion procedure (f. 1): When, Ti(IV)-Fe(III) nd Ti(IV)-Zr(IV) binry mixtures were pssed through the column t ph 2.5, only Ti(IV) from the mixtures ws percolted through the column with the mobile phse. The extrcted Fe(III) nd Zr(IV) were eluted with 0.1 M HCl nd 4 M HNO 3 respectively. Binry mixtures contining Ti(IV) with Co(II), Ni(II), Zn(II) nd Cd(II) when equilibrted with the SSG-V10 t ph 5.75 except Ti(IV) ll the diverse ions were pssed through column with the mobile phse. Ti(IV) in ech cse ws stripped with 1 M HCl + H 2 O 2. Binry mixtures contining Ti(IV)-Al(III) nd Ti(IV)-Pb(II), when pssed through the column t ph 5.75, from their respective mixtures both Al(III) nd Pb(II) were extrcted long with Ti(IV). Al(III) nd Pb(II) respectively were eluted with 1M CH 3 COOH, nd M CH 3 COOH. Ti(IV) in ech cse ws stripped with 1 M HCl + H 2 O 2. In order to justify its possible nlyticl ppliction, the proposed method ws pplied to seprte Ti(IV) from vrious multi-component synthetic mixtures. The multicomponent synthetic mixtures contining Fe(III) / Zr(IV), Cr(III) / Co(II) / Ni(II) / Zn(II) / Cd(II) nd Ti(IV) when pssed through the column t ph 2.5, only Fe(III) / Zr(IV) ws extrcted. The extrcted Fe(III) nd Zr(IV) were eluted with 0.1 M HCl nd 4 M HNO 3 respectively. The effluent contining Cr(III) / Co(II) / Ni(II) / Zn(II) / Cd(II) nd Ti(IV) ws then equilibrted with the SSG-V10 t the column t ph Under this recommended

2 condition, from their respective solution only Ti(IV) ws extrcted nd subsequently it ws eluted with 1 M HCl + H 2 O 2 (tble: 6). Synthetic mixture contining Fe(III) / Zr(IV), U(VI) / V(IV) / Th(IV) / Ce(IV) nd Ti(IV) when pssed through the column t ph 2.5, except Fe(III) / Zr(IV), both the diverse ions (U(VI) / V(IV) / Th(IV) / Ce(IV) nd Ti(IV)) were pssed through with the mobile phse. The effluent contining U(VI) / V(IV) / Th(IV) / Ce(IV) nd Ti(IV) ws subsequently pssed through the ion-exchnge bed t ph 5.75, when both U(VI) / V(IV) / Th(IV) / Ce(IV) nd Ti(IV) were extrcted t the column. The seprtions were chieved by using suitble eluting gent. Supplementry Figure: logk d ph Fig. S1: Plot of ph vs. log K d t fixed concentrtion of Ti(IV) & extrctnt

3 B C D Ti(IV) ( g) Volume of eluent (ml) Fig. S2: Elution profile ( = HNO 3 ; = HCl; =H 2 SO 4 ) Recovery (%) y = x ; R 2 = y = x ; R 2 = Volume of influent (ml) Fig. S3: Effect of influent volume on recovery

4 logk ex y = x+8.66; R 2 =0.996; SD = /T C/C Time(sec) 293K 298K 8K 310K Fig. S4: plot of log K ex vs. 0/T Fig. S5: Effect of rection temperture on the removl efficiency of Ti(IV)

5 Supplementry tble Tble S1: Elution study of Titnuim (IV) [Ti(IV) tken: mgml -1 ; Column-0.8 8cm; flow rte: 1mL min -1,pH: 5.75; temp: 25 0 C] Eluent Conc.(M) V mx (ml) V totl (ml) # Recovery(%) HNO HCl + H 2 O H 2 SO CH 3 COOH Nil # Averge of five determintions

6 R f i R f Ti(IV ) Tble S2: R f vlues nd selectivity fctors (α = / ) of different metl ions on Whtmn No 1 impregnted with Verstic-10; [Time = 2.5 hours; ph = 5.75; ph = 2.5; developing solvent = cette buffer : cetone (25:1) v/v] Metl ions R f vlues Affinity order Selectivity fctor (α) Metl ions R f vlues Affinity order Selectivity fctor (α) C(II) 0.92 Sn(II) U(VI) 0.14 V(IV) 6.67 Mg(II) 0.90 C(II) V(IV) 0. Al(III) 3.33 Co(II) 0.89 Mg(II) Al(III) 0.20 Ce(IV) 2.83 Zn(II) 0.88 Co(II) Ce(IV) 0.17 U(VI) 2.33 Cd(II) 0.84 Ni(II) Th(IV) 0.02 G(III) 2.17 Pb(II) 0.51 Zn(II) G(III) 0.13 Th(IV) b 3.00 Sn(II) 0.95 Cr(III) Ti(IV) 0.06 Ti(IV) 1.00 Cr(III) 0.86 Cd(II) Fe(III) 0.38 Ti(IV) 1.00 Ni(II) Ce(IV) b = 1 Pb(II) Ce(IV) Ti(IV) Zr(IV) Fe(III) Zr(IV) b 2.37 b 15.5 Tble S3: Determintion of Ti (IV) nd Cr (III) in wter smples [Ti(IV) = 2 µg ml -1 ; Cr(III) = 204 µg ml -1 ; smple volume = 0 ml] Smple Wter Metl ion Added (µg ) Found (µg) Recovery (%) PF pond Ti(IV) - ND - wter Cr (III) N D Well wter Ti(IV) Cr(III) Averge of five determintions ND N D

7 Tble S4: Comprison of the observed conc. (Spectrophotometry) with the preconcentrtion technique fter seprtion. [Smple volume 0 ml, flow-rte = 5 ml min -1. Smple Concentrtion (µg ml -1 ) Reltive Error (%) Added Spectrophotometry predicted Pond wter (1.) Well wter (1.82) Vlues in the prenthesis represent the reltive errors (%).

Problem 22: Buffer solutions 1. The equilibrium, which governs the concentration of H + within the solution is HCOOH! HCOO + H + + Hence K

Problem 22: Buffer solutions 1. The equilibrium, which governs the concentration of H + within the solution is HCOOH! HCOO + H + + Hence K Problem : Buffer solutions. The equilibrium, hich governs the concentrtion of H ithin the solution is HCOOH! HCOO H [HCOO ] 4 Hence. [HCOOH] nd since [HCOOH] 0.00 M nd [HCOO ] 0.50 M -4 0.00 4..8 M 0.50