A simple one-pot synthesis of a Zn(O,S)/Ga₂O₃ nanocomposite photocatalyst for hydrogen production and 4-nitrophenol reduction

Abstract

Herein, we demonstrate the great photocatalytic hydrogen evolution of a noble metal-free Zn(O,S)/Ga2O3 heterojunction nanocomposite in ethanol solution and its application in 4-nitrophenol reduction.

Ag3PO4/NiO Composites with Enhanced Photocatalytic Activity under Visible Light

“…The composites are of the type-I because the positions of the VB and CB of NiO are lower and higher, respectively, than that of the VB and CB of Ag 3 PO 4 . 51 , 52 , 54 , 61 …”

“…63 , 64 In type-I composites, the redox reaction occurs primarily on the surface of the semiconductor in which the charges accumulate. 51 , 52 , 61 …”

Convenient synthesis of Mn-doped Zn (O,S) nanoparticle photocatalyst for 4-nitrophenol reduction

“…After introducing 10% Mn-doped Zn(O,S) catalyst without ethanol, the absorbance did not decrease furthermore, as shown in figure 4c and the reduction did not obviously happen. This can be explained as that more hydrogen ions for the significant 4-NP reduction are needed, while the reduction reaction to produce hydrogen ion was very low without using ethanol as sacrificial reagent, as shown in our previous reports [8,12,14]. The figure 5d shows the 4-NP reduction in the presence of 10% Mn-doped Zn(O,S) with 10% ethanol.…”

“…Experimental section The experimental procedures were similar to our previous work [12], except MnCl 2 at 0, 2.5, 5, 10, and 20 % base on the amount of zinc acetate hydrate was added for each Mn-doped Zn(O,S). Briefly, 20 mmol of zinc acetate hydrate, 2 mmol of manganese chloride, and 10 mmol of thioacetamide were dissolved in 800 mL deionized water.…”

Photocatalytic degradation of ethylene by Ga2O3 polymorphs

“…Among these wide band gap semiconductors, Ga 2 O 3 is regarded as one of the most promising semiconductors owing to its superior physical and chemical properties and a wide band gap 4.2-5.0 eV, which has been widely investigated on overall water splitting, benzene decomposition and CO 2 reduction, etc. [13][14][15][16][17] Therefore, Ga 2 O 3 is expected to be more efficient than TiO 2 on photocatalytic ethylene degradations. Moreover, Ga 2 O 3 has four polymorphs, namely, a-, b-, g-, d-, and 3-Ga 2 O 3, which could lead to the variations on photocatalytic activities.…”