g-C3N4/CeO2 Binary Composite Prepared and Its Application in Automobile Exhaust Degradation

Abstract

Vehicle exhaust seriously pollutes urban air and harms human health. Photocatalytic technology can effectively degrade automobile exhaust. This work prepared g-C3N4/CeO2 photocatalytic material by constructing heterojunctions. Four kinds of g-C3N4/CeO2 composite photocatalytic materials with different mass ratios were prepared. An indoor exhaust gas purification test was carried out under natural light and ultraviolet light irradiations. The optimum mass ratio of g-C3N4 material and CeO2 material was determined by evaluating the exhaust gas degradation effective. Moreover, the structure and morphology of the g-C3N4/CeO2 composite were investigated with microscopic characterization experiments (including XRD, TG-DSC, FT-IR, UV-Vis, SEM and XPS). The results obtained were that the optimum mass ratio of g-C3N4 material to CeO2 material was 0.75. The degradation efficiencies under ultraviolet irradiation in 60 min for HC, CO, CO2, NOX were 7.59%, 12.10%, 8.25% and 36.82%, respectively. Under visible light conditions, the degradation efficiency in 60 min for HC, CO, CO2 and NOX were 15.88%, 16.22%, 10.45% and 40.58%, respectively. This work is useful for purifying automobile exhaust in the future.

Crystalline C3N4/CeO2composites as photocatalyst for hydrogen production in visible light

“…When CeO2 was added into g-C3N4, the peaks corresponded to g-C3N4 observed at 13.4˚ and 27.4˚was not visible due to low intensity compared to CeO2 peaks in g-C3N4/CeO2. The peak associated with CeO2 with the respective crystal planes were observed at 28.4˚ (111), 33.1˚(200), 47.4˚(220), 56.3˚(311), 59.1˚(222), 69.8˚(400), 75.6˚(331), 79.0˚(420) (JCPDS 34-0394) [34]. The XRD of g-C3N4/CeO2 indicate the present of higher number of amorphous g-C3N4 structure in catalyst when obtained via direct calcination.…”

“…The g-C3N4/CeO2 composite would form a heterojunction structure supporting the separation for photogenerated electron-hole. In a heterojunction situation the photoexcited electron would move from valence band to the conduction band of g-C3N4, to the conduction band of CeO2, this creates a delay of the electronhole recombination which improve the photocatalytic activity [34]. Currently there is no definitive technique of synthesizing the ideal g-C3N4 base photocatalytic, which resulted in various methodologies and outcomes.…”

Synthesis of g‐C3N4, Zn3(PO4)2 and g‐C3N4/Zn3(PO4)2 Composites for Application in Photodegradation of Crystal Violet Dye under Solar Light

“…In the case of g‐C 3 N 4 an 87 % weight loss was observed in the temperature range of 550 °C −720 °C due to the decomposition of carbon nitride. On increasing the temperature above 720 °C, g‐C 3 N 4 was burnt off completely (Figure 3a) [60] . Zn 3 (PO 4 ) 2 shows the weight loss from 100 wt % to 96 wt % in the temperature range 38 °C–100 °C due to adsorb water molecule.…”

“…On increasing the temperature above 720°C, g-C 3 N 4 was burnt off completely (Figure 3a). [60] Zn 3 (PO 4 ) 2 shows the weight loss from 100 wt % to 96 wt % in the temperature range 38°C-100°C due to adsorb water molecule. Further it shows weight loss from 96 wt % to 86 wt % in the temperature range 100°C-305°C due to loss of tightly bound water molecules (Figure 3b) as reported for calcium phosphate by Keskar et al [61] Further, increase in the temperature doesn't cause a significant change and indicates the material is stable at high temperatures, i. e. (up to 800°C).…”

A Comprehensive Review of Graphitic Carbon Nitride (g-C3N4)–Metal Oxide-Based Nanocomposites: Potential for Photocatalysis and Sensing

“…1 g/L of the composite containing g-C 3 N 4 with 9 wt % Bi 2 O 3 at 10 ppm reactive black 5 (RB 5) at pH = 5.7 demonstrated 84% degradation efficiency under UV-vis light for 120 min. The synergistic effects between g-C 3 N 4 and CeO 2 provides higher catalytic activities compared to the bare ones [457][458][459]. The catalytic effects of the g-C 3 N 4 /CeO 2 composite, bare g-C 3 N 4 , and CeO 2 on the thermal decomposition of ammonium perchlorate (AP) were analyzed by using TGA and DTA characterization [460].…”