Ag1.69Sb2.27O6.25 coupled carbon nitride photocatalyst with high redox potential for efficient multifunctional environmental applications

Hydrothermal Preparation of Ag/Ag1.69Sb2.27O6.25 Sesame‐Hollow‐Ball‐Type Nanocomposites: The Formation Mechanism of Metallic Ag in the Ag‐H2O System at 400 K

“…e elemental distribution of the silver/silver antimonite is verified by the EDS elemental mapping, as illustrated in Figure 2(d 3(a) shows four peaks assigned to Ag + and Ag 0 , respectively. e peaks of Ag 3d at round 373.9 eV and 368.0 eV are assigned to Ag + corresponding to Ag 3d 3/2 and Ag 3d 5/2 , respectively, whereas the peaks at round 373.3 eV and 367.9 eV are assigned to Ag 0 , suggesting the existence of metallic Ag [10,20]. e O 1s XPS spectrum in Figure 3 Figure 4 shows the N 2 adsorption-desorption curves for Ag/Ag 1.69 Sb 2.27 O 6.25 nanocomposites, and the characteristics of the adsorption curve are a classic second kind of physical adsorption curve [21] in which the adsorption capacity increases slowly in the first half of the isotherm, showing an upward convex shape, and then violently increases in the second half of the one.…”

“…However, the single-phase silver antimonites have quite low reduction potential and suffer from the easy recombination of photogenerated electrons and holes. Combining two semiconductors to construct silver antimonite-based heterostructure photocatalysts such as AgSbO 3 /NaNbO 3 [8] and AgSbO 3 /AgNbO 3 [9] and designing a "Z-scheme" such as AgSbO 3 /Ag/g-C 3 N 4 [10] have been considered to be efficient methods to prepare photocatalysts for producing enhanced photocatalytic activity.…”

“…(b) shows two peaks at 530.4 eV and 530.8 eV. e former peak of 530.4 eV is derived from crystal lattice oxygen of Ag/Ag 1.69 Sb 2.27 O 6.25 , and the latter one comes from hydroxyl[10].…”

Hydrothermal Synthesis and Photocatalytic Properties of Graphene@Ag/AgSb2O5.8 Composites: Reaction Laws of the Composites in Sintering Process

“…In recent years, silver antimonite photocatalysis has been developed as a promising "green" photocatalyst with visible light sensitivity in environmental remediation in which the pollutant molecules are converted into nontoxic inorganic molecules by their reaction with both the reactive radicals O 2 and OH [19,20]. In order to efficiently destruct molecules of pollutants, photocatalysis must possess strong redox potentials to produce high reactive radicals of O 2 and OH [21]. However, the single-phase silver antimonite have quite low oxidation and reduction potential and suffer from the easy recombination of photogenerated electrons and holes [22].…”

Synthesis of Zn0.4(CuGa)0.3Ga2S4/CdS Photocatalyst for CO2 Reduction

“…2(e) 是 Zn0.4(CuGa)0.3Ga2S4/CdS 的 HRTEM 照片， 从图中可 以看到两组规则的晶格条纹，分别对应 CdS 的(111) 晶面和 Zn0.4(CuGa)0.3Ga2S4 的(220)晶面 [15] 。 通过 X 射线能谱仪(EDS)对 Zn0.4(CuGa)0.3Ga2S4 [24] 。 Zn0.4(CuGa)0.3Ga2S4/CdS-2:1 结合能 更高，可以认为当 CdS 在 Zn0.4(CuGa)0.3Ga2S4 上生 长后 Cu 原子的电子密度有一定程度升高 [25][26] 。 CdS 的 Cd3d XPS 光谱(图 4b)在 411.9 和 405.1 eV 处出 现两个峰， 对 应 Cd3d3/2 和 Cd3d5/2 轨道 [25] 。 Zn0.4(CuGa)0.3Ga2S4/CdS-2:1 的 Cd3d 轨道能相对于 CdS 有所降低，表明 CdS 在 Zn0.4(CuGa)0.3Ga2S4 上 生长后 Cd 的电子云密度降低。图 4(c)为 S2p 的 XPS 光谱，Zn0.4(CuGa)0.3Ga2S/CdS-2:1 在 163.2、161.9、 160.6 eV 处出现了三个峰， 分别对应 S2p3/2、 S2p1/2、 Ga3s 轨道 [26] 。相对于 CdS，S2p3/2 和 S2p1/2 轨道均 略微向更低的结合能移动。以上结果表明，两相复 合结构有成键作用，而非简单的物理混合。图 4(d) 为 Ga3d 的 XPS 光谱，在 20.4 eV 处出现一个峰， 对应 Ga3d5/2 轨道 [27] 。由于结合能没有发生变化，表 明 Ga 的状态基本一致。Zn2p 的 XPS 光谱复合前后 没有明显变化，表明 Zn 的状态不变 [27] ( 1 ) 计算材料的禁带宽度 Eg [28] (2) 对 载 流 子 寿 命 进 行 拟 合 [30] 。 Zn0.4(CuGa)0.3Ga2S4/CdS-2:1、Zn0.4(CuGa)0.3Ga2S4 和 CdS 的荧光寿命依次为 2.498、1.252、0.798 ns。 Zn0.4(CuGa)0.3Ga2S4/CdS-2:1 复合材料的荧光寿命是 Zn0.4(CuGa)0.3Ga2S4 材料的 2 倍，CdS 材料的 3 倍， 由此可见制备的 Zn0.4(CuGa)0.3Ga2S4/CdS Z 型异质 结的光生电子和空穴寿命明显得到提高。…”