Synthesis and Photocatalytic Activity of Cerium‐Modified CdS‐TiO₂ Photocatalyst for the Formaldehyde Degradation at Room Temperature

Abstract

The Ce‐CdS‐TiO2 photocatalysts were successfully synthesized by a simple sol‐gel way and loaded on the nickel foam. The specific surface area, crystalline phase, microstructure and surface functional groups of prepared photocatalysts were characterized by Brunauer‐Emmett‐Teller (BET) surface area, X‐ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), and Fourier transform infrared spectroscopy (FT‐IR). The photocatalytic tests of Ce‐CdS‐TiO2 samples demonstrated that Ce as the active component plays an irreplaceable role in degradation of gaseous formaldehyde. The results showed that high Ce doping levels restrained the photocatalytic activity due to lower specific surface area, whereas moderate doping levels showed the highest photocatalytic performance due to higher specific surface area and evenly dispersion of the active component. The rate of formaldehyde degradation on 0.9 wt % Ce‐CdS‐TiO2, 1.5 wt % Ce‐CdS‐TiO2, and 2.1 wt % Ce‐CdS‐TiO2 photocatalysts can reach to 59, 84, and 49 %, respectively, which are higher than pure TiO2 (20 %). Ce‐doping into CdS‐TiO2 photocatalyst produce the Ce‐O‐Ti bonds, which enhanced the interaction between Ce and TiO2. The introduction of Ce increased the UV/Vis absorption of Ce‐CdS‐TiO2 photocatalyst. Furthermore, Ce‐CdS‐TiO2 possesses high photocatalytic performance, since Ce may reduce the recombination of photoexcited electrons and holes.

Thermally treated zeolitic imidazolate framework-8 (ZIF-8) for visible light photocatalytic degradation of gaseous formaldehyde

“…The photocatalytic performance of ZIF-8-T3 is signicantly better than those of recently reported photocatalysts for HCHO degradation under similar experimental conditions. 6,[42][43][44][45] The stability and reusability of ZIF-8-T3 were investigated by repeating the photocatalytic HCHO degradation with recycled ZIF-8-T3, as shown in Fig. S9.…”

The rGO/BiOBr/Bi4O5Br2 Composites with Stacked Nanosheets for Ciprofloxacin Photodegradation under Visible Light Irradiation

“…On the basis of the above experiments and the energy gaps of the BiOBr (2.60 eV) and Bi 4 O 5 Br 2 (2.35 eV) catalysts reported in the literature, the feasible photocatalytic mechanism is proposed, and displayed in Figure . Under visible light irradiation, the rGO/BiOBr/Bi 4 O 5 Br 2 composites absorb the energy to generate electron‐hole pairs . The rGO can reduce the recombination of electron‐hole pairs by transferring photo‐induced electrons , , .…”

Enhancement of Red Upconversion Emission of ZnS: Er3+/Yb3+ Powders Synthesized via Solid Phase Reaction Method by Introducing Metal Fluoride

“…The mol ratio of Er/Zn and Yb/Zn are 1/100 and 3/100, respectively. The host cation of ZnS is 100 %, and the amount of impurities of metal fluoride is based on the host [41] . The doping amount of NaF, CaF 2 , LiF, AlF 3 and MgF 2 are fixed at 3 wt% (compared with the theoretical content of ZnS), and the doping amount of LiF is varied from 0, 1 wt%, 3 wt%, 5 wt%, 7 wt% to 9 wt%.…”