Facile Construction of Bi₂MoO₆/Bi/g-C₃N₄ toward Efficient Photocatalytic Oxidation of Indoor Gaseous Formaldehyde with a Wide Concentration Range under Visible Light Irradiation

Abstract

The removal of formaldehyde (HCHO) has attracted tremendous attention, because the toxicity and volatility of HCHO seriously affect human health. It is urgent to develop a catalyst that can efficiently remove HCHO in indoor conditions. Here, the Bi 2 MoO 6 /Bi/g-C 3 N 4 heterojunction is prepared by a simple hydrothermal approach and subsequently an in situ reduction. The prepared material is used to photocatalytic degrade HCHO from 50 to 1600 ppm under simulated indoor conditions, presenting 96.15% conversion for 200 ppm and 98.80% for 1600 ppm under 10 h of visible light irradiation. Its long-term utility was confirmed with an unchanged activity after six recycling tests at a long 60 h of visible light illumination. An environmental factor estimation indicates its superior CO 2 selectivity (99.79%) and excellent humidity resistance. The good performances are assigned to the Bi nanoparticles produced in situ, linking Bi 2 MoO 6 and g-C 3 N 4 together, which contribute to the excellent visible light harvesting, quick separation of electron−hole pairs, strong adsorption toward HCHO, and less shedding and aggregation. The materials could also be utilized to effectively removal general gaseous pollutants (C 6 H 6 and CH 3 COOCH 2 CH 3 ). This work is expected to develop a novel material that could be potentially integrated into the instrument for remedying of indoor gas.

Highly Selective Production of Ethanol Over Hierarchical Bi@Bi2MoO6 Composite via Bicarbonate‐Assisted Photocatalytic CO2 Reduction

“…Notably, the HRTEM image of Bi@Bi 2 MoO 6 shows that two different lattice spacings exist in the sample (Figure 1i). The lattice spacings of 0.315 and 0.328 nm belong to the (131) facet of Bi 2 MoO 6 and the (012) facet of metallic Bi, respectively [16] . Meanwhile, compared with pure Bi 2 MoO 6 (Figure 1e), it is observed that there were many nanoparticles on the nanosheet surface of Bi@Bi 2 MoO 6 (Figure 1h), corresponding to the inset of Figure 1c.…”

Photocatalytic Air Purification Using Functional Polymeric Carbon Nitrides

“…[49,260,263] The superfine Bi nanoparticles as a low-cost alternative of charge transfer medium are usually used in the construction of indirect Zscheme nanojunctions because of the good conductivity and SPR properties. [135,360] In addition, Bi-based inorganic materials show great potential in HCHO oxidization because of the band position and high-energy orbital of Bi 6s. For instance, Wu et al successfully constructed a solid indirect Z-scheme nanojunction of Bi 2 MoO 6 /Bi/PCN through in situ reductions to yield Bi NPs (Figure 13D).…”

“…The electronic structure regulation and heterostructure construction on PCN are rapidly developed to enlarge the exploitation of PCN photocatalysts on VOC removal, showing the importance and development of this field. [ 63 , 106 , 118 , 135 ] Here, we reviewed the catalyst preparation/synthesis, measurements of catalytic activity, and discussion/understanding of the activity enhancement and catalytic mechanism in the VOC photooxidation. Some recently reported PCN‐based photocatalysts with various strategies used in VOC removal are shown in Table 3 .…”

“…Reproduced with permission. [ 135 ] Copyright 2020, American Chemical Society. E) TEM images of BiVO 4 /PCN samples.…”

“…For instance, Wu et al successfully constructed a solid indirect Z-scheme nanojunction of Bi 2 MoO 6 /Bi/PCN through in situ reductions to yield Bi NPs (Figure 13D). [135] This assembled nanojunction presented a commendable activity in degrading gaseous HCHO (96.15%) and robust CO 2 selectivity (99.79%), which was primarily contributed to the small impedance endowed the decreased migration resistance of the charges, the vacancies on the surface of PCN endowed the promoted adsorption of HCHO, and the uniform distribution of Bi NPs endowed the boosted transmission of useless electrons. Tang et al created a direct AgFeO 2 /PCN Z-scheme composite by a simple precipitation method.…”