Two novel coordination polymers for Hg(II) removal in water

Under the hydrothermal condition, two novel two-dimensional coordination polymers ([Cd(D-Cam)(bpb)](n), CP -1 and [Zn(D-Cam)(bpb)](n), CP -2) have been constructed, and they have similar structures. It is composed of D-(+)-camphor (D-Cam) and metal center (Cd(II) and Zn(II)) to construct one-dimensional chains, which are connected by the V shaped flexible 1,2-Bis((pyridin-4-ylthio)methyl)benzene (bpb) bridging ligand to form two-dimensional layer structure. CP-1 and CP-2 not only have good stability, but also can remove Hg(II) ions in water, and maximum adsorption capacity is 240 mg/g and 329 mg/g, respectively. Both the adsorption of Hg(II) ions on CP -1 and CP -2 can be well fitted by the Langmuir model and pseudo-second-order kinetics model. Moreover, CP-1 and CP-2 can still maintain a high adsorption capacity, even in a complex environment where a large number of other ions exist.

Automated summary

Under hydrothermal conditions, two similar two-dimensional coordination polymers CP-1 and CP-2 were constructed using D-(+)-camphor and metal centers Cd(II) and Zn(II) as one-dimensional chains linked by the flexible bpb ligand to form a two-dimensional layer structure. CP-1 and CP-2 exhibited good stability, as well as high adsorption capacities for Hg(II) ions in water. They can still maintain high adsorption capacity even in complex environments with other ions present.