Fig. 1. Preparation flow chart of TiO₂-g-PDMAEMA

Fig. 2. SEM images: (a), (c) TiO₂; (b), (d) TiO₂-g-PDMAEMA

Fig. 3. (a) Infrared spectrum of TiO₂ and TiO₂-g-PDMAEMA; (b) XRD patterns of TiO₂ and TiO₂-g-PDMAEMA; (c) Thermogravimetric analysis of TiO₂ and TiO₂-g-PDMAEMA prepared by different monomer concentrations

Fig. 4. (a) XPS spectrum of TiO₂; (b) XPS spectrum of TiO₂-g-PDMAEMA; (c) Ti 2p orbital; (d) O 1s orbital; (e) C 1s orbital; (f) N 1s orbital

Fig. 5. Contact angles of (a) TiO₂ and (b)~(e) as-prepared TiO₂-PDMAEMA with different monomer concentrations

Fig. 6. (a) Adsorption capacity of TiO₂ and TiO₂-g-PDMAEMA prepared under different absorbed doses on Cr(VI) in solution; (b) TiO₂ and TiO₂-g-PDMAEMA prepared under different monomer concentrations on Cr(VI) in solution adsorption capacity

Fig. 7. Adsorption-photocatalytic reduction of Cr(VI) by TiO₂ and TiO₂-g-PDMAEMA prepared with different monomer concentrations

Fig. 8. Zeta potential curves of TiO₂ and TiO₂-g-PDMAEMA as a function of pH

Fig. 9. Mechanism diagram of adsorption photocatalytic reduction of Cr(VI)