▎ 摘　　要

In this work, to efficiently eliminate the threat of toxic Cl- and Hg2+, a kind of AgRu bimetal mesoporous nanozyme co-stabilized by beta-cyclodextrin and graphene oxide (AgRu@beta-CD-co-GO) was first developed by a homogeneous redox and assembly method. The mesoporous microstructure and a large number of hydroxyl groups and GO aryl rings endowed AgRu@ beta-CD-co-GO with superior peroxidase-mimic performance and enough active spots to adsorb more toxic Cl- and Hg2+. Under optimal conditions (pH 4.0, 350 mu L. 1.5 mM TMB and 200 mu L. 1.0 M H2O2 and incubated for 30 mM at 25 degrees C), AgRu@ beta-CD-co-GO could accelerate the oxidation of colorless 3,3',5,5'-tetramethylbenzidine (TMB) into blue oxTMB in the presence of H2O2. Toxic Cl- or Hg2+ would exclusively alter its peroxidase-like activity, accompanied with the characteristic UV-vis absorption intensity at 653 nm (A(653)) decreased and color changed from blue to colorless. AgRu@ beta-CD-co-GO was successfully applied for visual detection of Cl- and Hg2+ and enriched removal of them after their detection. The detection limits were low to be 3.2 x 10(-10) mol.L-1 for Hg2+ and 6.4 x 10(-8) mol/L for Cl-. After detection, more than 94.9% Hg2+ and 93.8% Cl- could be removed by only a simple filtration. The mechanisms for peroxidase-mimic activity of AgRu@ beta-CD-co-GO and its exclusive recognition of Hg2+ and Cl- were proposed.