Citation: Wenting An, Xiujuan Zhang, Jiaqi Niu, Yuanyuan Ma, Zhangang Han. Unusual hexa-nuclear cadmium cluster functionalized phosphomolybdate as effective photoelectrochemical sensor for trace Cr(Ⅵ) detection[J]. Chinese Chemical Letters, ;2022, 33(9): 4400-4404. doi: 10.1016/j.cclet.2021.12.021 shu

Unusual hexa-nuclear cadmium cluster functionalized phosphomolybdate as effective photoelectrochemical sensor for trace Cr(Ⅵ) detection

Hebei Key Laboratory of Organic Functional Molecules, National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang 050024, China

mayy334@hebtu.edu.cn

hanzg116@hebtu.edu.cn

Received Date: 13 November 2021
Revised Date: 6 December 2021
Accepted Date: 10 December 2021
Available Online: 18 December 2021

Figures(4)

Photo-assisted electrochemical technique provides a promising approach towards carcinogen chromium(Ⅵ) detection, which requires reasonable catalyst design. Herein, an unusual hexa-nuclear cadmium cluster functionalized reductive phosphomolybdate hybrid as photo-electrochemical sensor was designed and synthesized with formula of {[Cd(H₂O)₂]₂[Cd(btmbp)]₂}{Cd(P₄Mo₆O₃₁H₇)₂}·20H₂O (1) (btmbp= 4,4′-bis((1H-1,2,4-triazol-1-yl)methyl)biphenyl), in which the photoactive hexa-nuclear {Cd₆} clusters cooperated with reductive phosphomolybdate [P₄Mo₆O₃₁]¹²⁻ endow the material with wide light absorption and remarkable redox activity, thus achieving efficient photo-assisted electrochemical Cr(Ⅵ) detection performance. Under visible-light assistance, the detection limit (LOD) and sensitivity of Cr(Ⅵ) is 4.17 nmol/L (0.225 ppb) and 226.32 µA L/µmol, which is apparently superior to the performance without photo-assistance (6.25 nmol/L and 106.95 µA L/µmol) and far satisfies the demands of world health organization (WHO) for potable water (50 ppb). Moreover, compound 1 showed prominent Cr(Ⅵ) detection performance in practical water samples together with remarkable anti-interference capacity and good electrochemical durability. This work provides an important guidance for designing efficient polyoxometalate-based crystalline sensors for Cr(Ⅵ) detection.
- Phosphomolybdate,
- Cadmium cluster,
- Photoelectrocatalysis,
- Electrochemical detection,
- Hexavalent chromium
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