As(V) and As(III) removal from water by a Ce-Ti oxide adsorbent: Behavior and mechanism

作者：Li Zhijian; Deng Shubo^*; Yu Gang; Huang Jun; Lim Veronica Chao

来源：Chemical Engineering Journal, 2010, 161(1-2): 106-113.

DOI：10.1016/j.cej.2010.04.039

• Ce-Ti oxide adsorbent
• Sorption capacity
• Sorption mechanism
• As(V)
• As(III)

Since As(V) and As(III) usually occur in groundwater simultaneously, the synthesis of novel adsorbents for both As(V) and As(III) removal is attractive. In this paper, a Ce-Ti hybrid oxide adsorbent with high sorption capacities for As(V) and As(III) was successfully prepared using a two-step reaction. Environmental scanning electron microscopy (ESEM) revealed that the Ce-Ti oxide adsorbent was composed of nanoparticles in the size range of 100-200 nm. Sorption isotherms show that the powdered adsorbent had high sorption capacity up to 7.5 mg/g for As(V) and 6.8 mg/g for As(III) at the equilibrium arsenic concentration of 10 mu g/L, higher than most reported adsorbents. The optimum adsorption capacity on the adsorbent was achieved at pH below 7 for As(V) and at neutral pH for As(III). Fourier transform infrared (FTIR) analysis indicated that the hydroxyl groups on the adsorbent surface were involved in arsenic adsorption, while X-ray photoelectron spectroscopy (XPS) provided further evidence for the involvement of hydroxyl groups in the sorption and the formation of monodentate and bidentate complexes on the adsorbent surface.

• 出版日期2010-7-1
• 单位清华大学