Fabrication and Characterization of N−TiO₂/C/ATP Composite with Enhanced Visible‐Light Photocatalytic Performance for the Degradation of Polyacrylamide in Wastewater

Abstract

A novel N−TiO2/C/attapulgite (N−TiO2/C/ATP) composite photocatalyst was prepared by sol‐gel method using ATP supported o‐phenanthroline modified TiO2. The as‐prepared samples were characterized by X‐ray diffraction (XRD), fourier transform infrared (FT‐IR), X‐ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), ultraviolet‐visible diffuse reflectance spectroscopy (UV‐vis DRS) and N2 adsorption–desorption measurements. The activity of these photocatalysts was tested by degrading polyacrylamide (PAM) under visible light irradiation while N−TiO2/C/ATP shows significant photocatalytic enhancement compared to pure TiO2. The optimal ratio of N−TiO2/C/ATP photocatalyst is n (TiO2): n (o‐phenanthroline)=20 : 1 and the m (N−TiO2/C): m (ATP)=1 : 1. When the initial concentration of PAM is 300 mg/L and the catalyst dosage is 1.5 g/L, the removal rate of chemical oxygen demand (COD) reaches 86.3 % at pH 2 under 2 h of visible light. The enhanced performance can be attributed to the C element in o‐phenanthroline is modified on the TiO2 surface as a surface sensitizer and the N element may enter anatase TiO2 lattice and replace to form O−Ti−N bond. Meanwhile, some TiO2 particles were permeated into the layer of ATP, which made the composite photocatalyst more stable and the N−TiO2/C/ATP composite exhibits good stability after three times recycling. In addition, the possible photocatalytic mechanism is proposed at the end.

The use of N^N ligands as an alternative strategy for the sol–gel synthesis of visible-light activated titanias

“…S4. 17,21,49,50 Furthermore, there is slight shift in the N1s signal with respect to the phenanthroline alone, which is in agreement with their complexation with transition metals. 51 This clearly proves that the Ti-N bond is maintained throughout the synthesis of the material.…”

Preparation, Characterization and Decolorization Performance of Magnetic Adsorbent Pellets Formed by the Utilization of Electric Flocculation Sludge

“…In addition, the surface property of MP was evaluated by N 2 sorption measurements, and the result is shown in Figure 7. The N 2 isotherm obtained for this material can be classed as type IV, and the appeared obvious loops indicating that the above sample has mesoporous structure, [35] which is confirmed by structural characteristic of table 1. This hysteresis can be classified as H3, and it is owed to the sheet like pores provided by the vermiculite.…”

NiFe-LDH/g-C3N4 binary heterostructures with 2D/2D configuration for highly efficient photocatalytic degradation of antibiotics and hydrogen production

“…photocatalytic TC degradation 36. Meanwhile, the holes accumulated in the VB of LDH cannot react with H 2 O or OH − to form •OH because the potential of H 2 O/•OH (1.99 eV vs. NHE) is more positive than the energy level of VB on LDH.…”