Zn-Al layered double hydroxide-based nanocomposite functionalized with an octahedral molybdenum cluster exhibiting prominent photoactive and oxidation properties

Abstract

A new layered double hydroxide (LDH)-based nanocomposite functionalized with an octahedral molybdenum atom cluster (MC) exhibiting prominent photoactive and oxidation properties was synthesized. Zn-Al LDH and Zn-Al LDH intercalated dodecyl sulfate compounds (abbreviated as LDH-1 and LDH-2 respectively) were prepared by the co-precipitation method in an aqueous solution. The MCs were simply introduced into the LDH-2 by an anion exchangeable method in dimethylformamide under ambient conditions. The extension of the basal spacing of the LDH-1 from 0.9 nm to about 5 nm by intercalating dodecyl sulfate and Mo 6 cluster was confirmed by several complementary technics. The octahedral structure of the Mo 6 cluster was retained after promising candidate as a heterogenized homogeneous catalyst for removing organic pollutants.

Zn–Al Layered Double Hydroxide Film Functionalized by a Luminescent Octahedral Molybdenum Cluster: Ultraviolet–Visible Photoconductivity Response

“…As already proposed, the Mo 6 clusters were possibly immobilized on graphene oxide nanosheets by covalent linking or to a silica matrix by hydrogen bonds and/or by Mo–O–Si covalent linking that modify the photoluminescent property of the cluster. In a previous work, the Mo–O–LDH chemical bonding was suggested between the [Mo 6 Cl i 8 Cl a 6– x – y (H 2 O) x (OH) a y ] x −2 ( x = 0, 1, or 2 and y = 0, 1, 2, 3; x + y = 3) cluster and Zn–Al LDH that was revealed on the basic result of X-ray photoelectron spectroscopy . In this study, one similarly suggested a hypothesis that the iodide Mo 6 cluster units would react with OH on the LDH surface to form Mo–O–LDH bonding and reduce the OH groups.…”

“…As already proposed, the Mo6 clusters were possibly immobilized on graphene oxide nanosheets by covalent linking 59 Zn-Al LDH that was revealed on the basic result of X-ray photoelectron spectroscopy. 61 In this study, one similarly suggested a hypothesis that the iodide Mo6 cluster units would react with OH on the LDH surface to form Mo-O-LDH bonding and reduce the OH groups. Therefore, the interactions between the Mo6 clusters and the metal-OH of LDH appear with the same peak position indicated in the pattern of the ZAG powder as seen in Figure 1a.…”

Synthesis of novel hexamolybdenum cluster-functionalized copper hydroxide nanocomposites and its catalytic activity for organic molecule degradation

“…The discovery of the unique photoactive and oxidative characteristics has broadened the potential applications to the fields of catalysis [10,11], optoelectronics [12,13], and biology [14][15][16]. The photoluminescence of the [{Mo 6 X i 8 }X a 6 ] 2cluster unit in a large red-NIR window originates from the important geometrical relaxations occurring in the triplet states.…”

“…As a phosphorescent dye, another characteristic of the [{Mo 6 X i 8 }X a 6 ] 2cluster units is their capability to produce singlet oxygen ( 1 O 2 ) [8,17]. The catalytic characteristic of the halide [{Mo 6 X i 8 }X a 6 ] 2cluster units was approached following two pathways, i.e., i) a photoactive catalyst based on the photoexcited cluster generating a pair of holes and electrons [10,18] and ii) redox catalyst based on the oxidized [{Mo 6 X 8 }X 6 ] 1− state as a strong and powerful oxidant [6,11]. For instance, the mixed halide [{Mo 6 I 8 }Cl 6 ] 2cluster unit can be reversibly oxidized [6].…”

“…The in recent and relevant studies by utilizing the Ouzo effect originating from nanomarbles for increasing the HER activity [19] or incorporated with graphene for photocatalytic water reduction [20] and hydrogen evolution [21] with a high efficiency. The prominent photoactive and oxidation performance of the Mo 6 cluster anchored on a layered double hydroxide activated by the hydrogen peroxide oxidizer has been revealed with a proper catalytic efficiency [11]. However, the reuse of the catalyst has not met the requirement.…”