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Fe 3+  modified bentonite was firstly prepared by ion change method and Fe 2+  modified bentonite was then synthesized by reduction of Fe 3+ -bentonite. The modified bentonites were characterized with XRD and SEM. The adsorption ability of Tetracycline (TC) of Fe 3+ -bentonite and Fe 2+ -bentonite was compared with raw bentonite. The catalytic activity of two Fe-bentonites used as heterogeneous Fenton catalyst are also examined. The resulted shows that both of Fe 3+ -bentonite and Fe 2+ -bentonite exhibited superior removal performance of TC. The removal capacities of Fe 3+ -bentonite and Fe 2+ -bentonite in the 400 mg/L TC solution reached 98.15% and 96.55%, respectively. The Fe 3+ -bentonite and Fe 2+ -bentonite remains 75% removal abilities after 3 rounds under Fenton condition. The mechanisms of adsorption and Fenton degradation of Fe modified bentonite were also discussed.

The adsorption and Fenton catalytic degradation of tetracycline by Fe 3+ and Fe 2+ modified bentonite