Search

A series of Gd/N codoped nanoTiO2 photocatalyst were synthesized to remove TOC in Power plant Boiler Make-up Water. The catalysts were prepared by sol–gel method and characterized by the means of XRD, TEM and UV-Vis DRS. Compared with pure TiO2, the catalytic activity of the nanocomposite photo-catalyst was improved significantly. The experiment results show that the optimum amounts of Gd and N-codoped TiO2 photocatalysts were 0.5 wt.% and 5mol %, respectively. Under the UV irradiation for 5 h at pH 3.0, the photocatalytic effect could be as high as 88% and the TOC removal efficiency was 81%, which indicates that photodegradation and mineralization of HA are synchronous, the two results correlate well.

In this paper, ultrafine Al2O3 particles were prepared by mechanical milling, and Ni-P-Al2O3 composite coatings were plated on Q235 steel substrates by brush-plating, which plating solutions were containing different concentrations Al2O3 particles. The morphology, phase and particle size distribution of the as-prepared Al2O3 particles, and the properties of the coatings after heat treatment were investigated. The results show that, the morphology of the as-prepared Al2O3 particles were spherical and almost size under 200nm, the coatings were uniformly thickness and the Al2O3 particles were uniformly dispersed in the coatings. Heat treatment could improve the performances of the brush-plating Ni-P-Al2O3 layers. After 1 hour heat treatment in 400oC, the layer which phosphoric content about 2.3wt% had high rigidity, good abrasion-resistance and adhesion strength, and the layer which phosphoric content about 10.1wt% has good erosion-resistance after 1h heat treatment in 600oC.

In this paper, nano-sized Al2O3 particles were prepared by mechanical milling, and Ni-P-Al2O3 composite coatings were plated on Q235 steel substrates, which plating solutions were containing different concentrations Al2O3 particles. The morphology, phase and particle size distribution of the as-prepared Al2O3 particles, and the properties of the coatings were investigated. The results show that, the morphology of the as-prepared Al2O3 particles were spherical and almost size under 100nm, the coatings were uniformly thickness and the Al2O3 particles were uniformly dispersed in the coatings, after heat treatment, the micro-hardness and wear resistance of the coatings were significantly improved, compared with the chemical method prepared Al2O3 particles, the mechanical method prepared Al2O3 particles had the same performance in improving the micro-hardness of the coatings.