Haomin Wang,Jiang Li,Dun Zhang,Guoqing Wang,Peng Wang
For the optical equipment used in the marine environment, the quality and accuracy of the tests are easily affected by biological fouling. Hence, good anti-fouling performance is crucial for preserving the optical equipment. A new electrochemical chlorination anti-fouling system has been proposed for years and is suitable for underwater optical windows. In this paper, nano Co 3 O 4 electrocatalysts with different morphologies were prepared through the hydrothermal method to study the structure–activity relationship between their electrochemical properties and morphologies. The nanourchin Co 3 O 4 shows the best electrochemical properties resulting from its large surface area . The titanium mesh electrode with nanourchin Co 3 O 4 was used to evaluate the anti-fouling performance. In comparison to commercial dimensionally stable anode electrodes, the developed Co 3 O 4 /titanium mesh electrode has higher catalytic performance, better selectivity , and lower cost. The bactericidal rate can reach 95% in 20 mins and it can effectively inhibit the sedimentation of microorganisms on the glass surface. Therefore, it is a promising strategy to use the nanourchin Co 3 O 4 as an electrocatalyst to protect the underwater optical windows.
This paper reports the synthesis of nanosized Ag/Co 3 O 4 composite catalysts using a silver-mirror reaction and the calibration of their catalytic activities towards methyl blue (MB) dye degradation with peroxymonosulfate (PMS) under visible light. The nanosized Ag/Co 3 O 4 composites were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV–vis spectroscopy. The experimental evidence indicated that the hydrothermal synthesis approach lead to the exposure of the {1 1 2} facets of the Co 3 O 4 nanoflakes. Compared to Co 3 O 4 nanoflakes, Co 3 O 4 doped with Ag nanoparticle (average diameters of 10–15 nm) presented lower band gap energy and photoluminescent (PL) intensity. Meanwhile, the Ag/Co 3 O 4 exhibited high stability and excellent dispersion property in dye solution. Experimental data suggested that 3.06 wt% Ag nanoparticle-doped Ag/Co 3 O 4 nanocomposite catalyst possessed the highest catalytic activity towards MB degradation in aqueous solution at the tested concentration level of 15 mg/L, about 2.4 times higher than that of pure Co 3 O 4 . Complete decolorization of the 15 mg/L MB solution can be achieved by 3.06 wt% Ag-doped Ag/Co 3 O 4 nanocomposite within 20 min of visible light irradiation.
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