Preparation of a Modified PTFE Fibrous Photo-Fenton Catalyst and Its Optimization towards the Degradation of Organic Dye

Abstract

Polytetrafluoroethylene (PTFE) fiber was grafted with acrylic acid to impart the carboxyl groups onto the fiber surface, which were used to coordinate with both transition metal ions Fe(III) and Cu(II) and a rare metal ion Ce(III) to prepare the metal grafted PTFE fiber complexes as the novel heterogeneous Fenton catalysts for the degradation of the azo dye in water under visible irradiation. Some factors affecting the preparation process, such as nature and concentration of metal ions in the coordination solution, grafting degree of PTFE and reaction temperature were optimized with respect to the content and strength of metal fixation on the fiber and dye degradation efficiency. The results indicated that increasing metal ion concentrations in solution and grafting degree of PTFE fiber as well as higher coordination temperature led to a significant increase in metal content, especially Fe(III) and Cu(II) content of the complexes. Fe(III) ions fixed on the fiber showed the better catalytic performance than Cu(II) and Ce(III) ions fixed when three different complexes with similar metal content being employed, respectively. Moreover, Increasing Fe content or incorporation of Cu(II) ions could significantly improve the catalytic activity of the complexes.

Removal of Textile Dyes from Aqueous Solution by Heterogeneous Photo-Fenton Reaction Using Modified PAN Nanofiber Fe Complex as Catalyst

“…This is because the Fe-AO-n-PAN or Fe-AO-PAN can enhance the reduction of the loaded Fe 3+ to Fe 2+ ions through the Fenton-like process, and the generated Fe 2+ ions are then oxidized immediately by H 2 O 2 to complete the Fe 3+ /Fe 2+ ions and generate • OH radicals, which is responsible for the dye degradation [23]. Additionally, the photosensitization of the azo dyes can promote a conversion of Fe 3+ to Fe 2+ ions during photoassisted Fenton reaction [5,24]. In this work, it is believed that RR 195 could act as the sensitizer of the Fe-AO-n-PAN or Fe-AO-PAN to lead to a charge transfer with the concomitant quenching of the excited dye * and the formation of dye + .…”

“…Compared with these techniques, Fenton and photo-Fenton processes as the advanced oxidation technologies can potentially complete the mineralization of organic pollutants in water. Moreover, the heterogeneous Fenton technology is replacing the homogeneous system because of its special advantages on a wide range of pH adaptability and easy recycling use [5]. The heterogeneous Fenton catalysts can be obtained by immobilizing Fe ions on the polymer substrates such as Nafion membrane and fibrous materials.…”

Photocatalytic Membranes in Degradation of Organic Molecules

“…Recently, there have been many reports of using modified poly(tetrafluoroethylene) (PTFE) fiber and membranes for the degradation of dyes [129,130]. Modified PTFE fibers by acrylic acid and loaded Fe 3+ were prepared and used as Fenton catalysts for the degradation of reactive Blue 222 in the pH range 3-9 under visible irradiation [131]. The study found that the loaded catalytic material had good performance in degradation of the azo dye, and the fibrous support could maintain good mechanical properties in the reaction…”

Renovation and Reuse of Reactive Dyeing Effluent by a Novel Heterogeneous Fenton System Based on Metal Modified PTFE Fibrous Catalyst/H2O2

“…Our previous work [19] revealed that Fe modified PTFE fiber complexes acted as an effective heterogeneous Fenton catalyst for the dye degradation under UV or visible irradiation. Moreover, the Cu-Fe bimetallic modified PTFE fiber complexes exhibited the excellent catalytic activity because of the existence of synergetic effect between Fe (III) and Cu (II) ions.…”