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To obtain a polymer silver complex photocatalyst with good stability and semiconducting behavior, polyacrylonitrile (PAN) fibers were amidoximated and then reacted with Ag­(I) ions for the preparation of amidoximated PAN fiber Ag complexes (Ag-AO-PAN) in this present study. The effect of Ag­(I) ion concentration, reaction temperature, and others on Ag content of the resulting complex was examined. On the basis of several characterizations, Ag-AO-PAN was employed as the semiconductor photocatalyst for the oxidative decomposition of Rhodamine B dye (RhB) to evaluate its photocatalytic oxidation capacity under LED visible irradiation. Additionally, the photocatalytic activity of Ag-AO-PAN was compared with that of a modified PAN fiber Fe complex (Fe-AO-PAN) or Ag3PO4 photocatalyst. The experimental results demonstrated that the Ag content of Ag-AO-PAN could be enhanced by increasing Ag­(I) ion concentration or coordination temperature. Ag-AO-PAN showed the crystal structure feature and displayed n type semiconducting behavior. The visible adsorption property of the complex was significantly improved through increasing its Ag content. Ag-AO-PAN could lead to a decomposition of RhB molecules in water without H2O2 under LED visible irradiation, which was found when it was replaced by Fe-AO-PAN under the same conditions. In addition, it exhibited better photocatalytic oxidative capacity and anti-photocorrosion performance than Ag3PO4 under similar conditions.

Cotton fabric was first modified with citric acid to introduce surface carboxyl groups, which then coordinated with Ag+ ions to prepare the Ag3PO4 finished cotton fabric through further reacting with PO43- ions using an industrialized pad-dry-cure process. Increasing surface carboxyl groups could significantly enhanced the loaded content of Ag3PO4. The padding process could more strongly fix Ag3PO4 on fabric than the conventional dipping method. The Ag3PO4 finished cotton fabric showed higher photocatalytic capacity than pure Ag3PO4 particles owing to the synergetic effect of the Ag complex with the carboxyl groups on the fabric. Moreover, the treatment of KBr and fixing agent further improved the the stability and anti-photocorrosion performance of the samples. Importantly, the finished fabric also exhibited better self-cleaning performance for Reactive Red 195 as a model stain under varied irradiation. The dye was found to be decomposed and mineralized on the finished fabric under artificial or solar irradiation.