Preparation of RGO-P25 Nanocomposites for the Photocatalytic Degradation of Ammonia in Livestock Farms

Abstract

In this paper, the Hummer's method was used to prepare the compound catalyst of reduced graphene and TiO 2 (RGO-P25), and the sand core plate was used as the carrier to provide the theoretical basis for the application of animal environmental purification by exploring the degradation of ammonia in RGO-P25. Characterization results show that the band gap of P25 is reduced from 3.14 eV to 2.96 eV after the combination of RGO, and the recombination rate of the photogenerated electrons and holes also decreased significantly, both resulting in the improvement of ammonia degradation by composite catalysts. Experimental results show that the carrier (sand core plate) and RGO-P25 are effectively stabilized with Si-O-Ti, but the blank core plate carrier could not degrade the ammonia, and its adsorption is not obvious, only 5% ± 1%, under 300 W ultraviolet lamp irradiation, the degradation rates of P25, RGO and RGO-P25 for ammonia at initial concentrations of 119-124 ppm were 72.25%, 81.66% and 93.64%, respectively. P25 dispersed through RGO can effectively adsorb ammonia on the surface to provide a reaction environment and thereby improve its photocatalytic efficiency, thus, endowing the RGO-P25 composites with higher photocatalytic degradation performance than RGO or P25 individually.

Reduced Graphene Oxide–P25 Nanocomposites as Efficient Photocatalysts for Degradation of Bisphenol A in Water

“…However, with the increase of rGO content, photocatalysts cause a redshift of the absorption edge. The reason of this shift is the reducing reflection of light by the presence of carbon [50] and a narrowing of the bandgap of TiO 2 , which is attributed to chemical bonding between the P25 and graphene [51][52][53]. The bandgap of pure P25 and 1% rGO-P25 can be calculated according to Equation (1):…”

Photocatalytic Platforms for Removal of Ammonia from Gaseous and Aqueous Matrixes: Status and Challenges

“…The utilization of a sand core plate as a support material resulted in the formation of Si−O−Ti bonds at the TiO 2 −silica interface, which stabilized catalytic activity. 184 Effective support/carrier materials can be crucial to preventing powdered photocatalysts inside a reactor blowing away, to enhancing the handling of catalysts (e.g., easy replacement/maintenance of catalyst bed), and to preparing wearable protection media such as lightweight materials with high light transmittance (e.g., textiles, fabrics, papers, and fibers). 185−187 A perforated nonwoven textile composed of cellulosic fibers coated with a mix of TiO 2 , zeolite, and silica has been recognized as an effective photocatalyst for NH 3 (g) (QY of 3.42 × 10 −03 molecules photon −1 and SY of 1.09 × 10 −06 molecules photon −1 mg −1 ) 188 (Table 1).…”

“…Graphene-based materials have received widespread attention in the domain of photocatalysis in recent years owing to their high specific surface, favorable electron mobility, and light transmittance. − Reduced graphene oxide (rGO)-based materials and composites are effective sensors with favorable adsorption capabilities and strong interactions with target species, including NH 3 . The coupling of rGO with TiO 2 has been proposed as an effective strategy to amplify the photocatalytic performance of pristine TiO 2 by retarding e – –h + recombination and providing favorable interactions with target species. − In this respect, the performance of an rGO/TiO 2 -sand core plate composite material was validated for NH 3 (g) removal (QY of 1.47 × 10 –04 molecules photon –1 ) (Table ). The utilization of a sand core plate as a support material resulted in the formation of Si–O–Ti bonds at the TiO 2 –silica interface, which stabilized catalytic activity …”

“…The coupling of rGO with TiO 2 has been proposed as an effective strategy to amplify the photocatalytic performance of pristine TiO 2 by retarding e – –h + recombination and providing favorable interactions with target species. − In this respect, the performance of an rGO/TiO 2 -sand core plate composite material was validated for NH 3 (g) removal (QY of 1.47 × 10 –04 molecules photon –1 ) (Table ). The utilization of a sand core plate as a support material resulted in the formation of Si–O–Ti bonds at the TiO 2 –silica interface, which stabilized catalytic activity …”

Degradation of ammonia gas by Cu2O/{001}TiO2 and its mechanistic analysis

“…The traditional process of ammonia treatment has high cost and short of stability, may aggravate the secondary pollution of the environment. 8 Photocatalysis technology is more and more popular due to its low reaction temperature and no secondary pollution in the reaction process. The main principle of photocatalysis technology is based on the oxidation-reduction ability of photocatalyst under light conditions, so as to achieve purication of pollution.…”