Preparation of poly(N, N-dimethylaminoethyl methacrylate)-TiO2 photocatalyst by radiation grafting and its adsorption and reduction performance for Cr(VI)

Abstract

TiO2-doped polymethacrylate N, N-dimethylaminoethyl methacrylate (DMAEMA) (TiO2-g-PDMAEMA) was successfully synthesized by the co-radiation grafting method with titanium dioxide (TiO2) and DMAEMA as the base and the monomer, respectively. Meanwhile, the effects of monomer concentration and absorbed dose on the adsorption of heavy metal ion were investigated. A series of characterizations, including X-ray diffraction, scanning electron microscopy, Fourier-transform infrared spectroscopy, thermogravimetry, X-ray photoelectron spectroscopy and contact angle, confirmed that DMAEMA monomer was successfully grafted onto TiO2 surface by electron beam co-radiation grafting method. When the absorbed dose was 60 kGy and the monomer concentration was 20%, TiO2-g-PDMAEMA exhibited excellent adsorption capacity for Cr (VI, 10 mg/L), up to 10.75 mg/g. In addition, the TiO2-g-PDMAEMA prepared at 60 kGy absorption dose and 10% monomer concentration displayed the optimal adsorption-photocatalytic reduction ability under visible-light irradiation, and the removal rate of Cr (VI, 10 mg/L) reached 85.56%. In conclusion, the adsorption-photocatalytic synergistic effect of this new photocatalyst could meet the requirement of removing Cr (VI) from water.

Keywords

• tio2
• polymethacrylate n
• n-dimethylaminoethyl methacrylate (pdmaema)
• radiation grafting
• photocatalytic
• cr（vi）
• adsorption-photocatalytic reduction