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SEM images of hydrothermal product A (a) and hydrothermal product B (b), and EDS point analysis of spot 1 (c) and spot 2 (d)
XRD patterns of hydrothermal products obtained at different NaOH concentrations and NaOH/tionite mass ratios
Effects of NaOH concentration and NaOH/tionite mass ratio on conversion of titanium
XRD pattern of dry tionite
Flow sheet of new process for recovery of titanium from tionite
Mechanism of TiO2+ adsorbed on CA-P204 adsorbent
XPS spectra of CA-P204 before and after Ti(IV) adsorption (a), O 1s spectra before Ti(IV) adsorption (b), O 1s spectra after Ti(IV) adsorption (c), P 2p spectra before Ti(IV) adsorption (d) and P 2p spectra after Ti(IV) adsorption (e)
Effect of successive adsorption–desorption cycle on breakthrough curve for removal of Ti(IV) from bauxite leaching solution (Ti(IV)=220 mg/L; Fe(III)=780 mg/L; Al(III) =2240 mg/L; temperature=303 K; flow rate=8.02 mL/h)
Column experiment installation (a) and adsorption-desorption cycle process chart (b)
Adsorption isotherms for Ti(IV) on CA-P204 (a) and effect of time on adsorption of Ti(IV) (b)
Effect of acidity on adsorption of Ti(IV) in single system ([Ti(IV)]=20 mg/L; solid?liquid ratio=2:1 g/L; temperature= 303 K; shaking time=24 h) (a) and solid?liquid ratio on adsorption of Ti(IV) in bauxite leaching solution ([Ti(IV)]= 220 mg/L; [Fe(III)]=780 mg/L; [Al(III)]=2440 mg/L; temperature=303 K; shaking time=24 h) (b)
FTIR spectra of CA (a), P204 (b), CA-P204 (c), and CA-P204 loaded with Ti(IV) (d)
SEM images of CA (a) and CA-P204 (b)
Species distribution of Ti(IV) in sulfate solution
Preparation flow of CA-P204