High-efficiency photo- and electro-catalytic material based on a basket-like {Sr⊂P₆Mo₁₈O₇₃} cage

Abstract

A novel high-efficiency photo-/electro-catalyst based on phosphomolybdate (H 4 bth) [{Mn 2 (H 2 O) 3 } {Sr⊂P 6 Mo 2 V Mo 16 VI O 73 }]·3H 2 O (1) (bth = 1,6-bis (triazole) hexane), have been hydrothermally10 synthesized and characterized by X-ray crystallographic analyses, FT-IR, UV-vis, TG-DTA, XRD, XPS, and the elemental analyses. Compound 1 is an eight-connected 2-D layer structure, which represents the highest-connected assembly of basket-type POMs. The compound exhibits universal high-efficient degradation ability for azo dyes MB, RhB, and AP under UV and visible light irradiation. The catalyst has long lifetime and can be recovered and reused with slight loss of reactivity. The major photoreaction 15 pathways of three dyes on the surface of catalyst 1 were detected by a series of radical trapping experiments. The result suggests that •O 2 -, •OH radicals and photogenerated h + play different roles in degradation process. The diffuse reflectivity spectrum provides essential evidences for high-efficient oxidation performance of basket-liked POM. The compound also shows good bifunctional electrocatalytic behavior for oxidation of AA and reduction of NO 2 -. Journal Name, [year], [vol], 00-00 | 5 irradiation; Plot of irradiation time versus concentration for (d) MB, (e) RhB, and (f) AP in the presence of catalyst 1 under UV-light irradiation. Graphical AbstractThe first 8-connected 2D layer based on basket-liked {Sr⊂P 6 Mo 18 O 73 } cage was prepared hydrothermal reaction, which exhibits universal high-efficient photodegradation performance for typical dye MB, RhB, and AP under visible and UV light, as well as bifunctional electrocatalytic behavior for oxidation of AA and reduction of NO 2 -. 5

Synthesis of a hierarchical structured NiO/NiS composite catalyst for reduction of 4-nitrophenol and organic dyes

“…28 However, the decolorization of wastewaters is still one of worldwide difficulty to which many various technologies have been applied. [29][30][31][32] Recently, technological applications such as adsorption, photocatalytic degradation, chemical oxidation, membrane ltration, occulation, and reduction have been used to remove organic pollutants and decolonized wastewaters. [33][34][35][36][37][38] Still now, the development of cost-effective, environmentally benign, and efficient techniques is an important concern in the eld of environmentology.…”

Nonclassical Phosphomolybdates with Different Degrees of Reduction: Syntheses and Structural and Photo/Electrocatalytic Properties

“…Since basketlike [H 2 dmpip] 5 [K⊂P 6 Mo 18 O 73 ] POM cluster was first synthesized by Zhang group in 2004, some organic–inorganic hybrids based on basketlike POMs and transition metal/transition metal complexes were reported by our group. ,, However, only a handful of {P 6 Mo 18 O 73 }-based compounds have been reported so far, and most of them are zero-dimensional (0D) cluster . As a result, it is valuable for the rational synthesis of extented materials by using basket anions as the building blocks to extend basket cluster from 0D to one-dimensional (1D) and two-dimensional (2D) architectures and further investigate their structural diversities and properties …”

“…However, N-donor ligands play an important role in adjusting the structures of POM-based extended assemblies. They are structure-directing agents in the construction of {P 6 Mo 18 }-based assemblies: they can always act as reducing agents to reduce Mo VI into Mo V centers . Furthermore, they can induce the {P 6 Mo 18 }-based inorganic fragments to form different dimensions or various packing arrangements in the final hybrid materials .…”

“…They are structure-directing agents in the construction of {P 6 Mo 18 }-based assemblies: they can always act as reducing agents to reduce Mo VI into Mo V centers . Furthermore, they can induce the {P 6 Mo 18 }-based inorganic fragments to form different dimensions or various packing arrangements in the final hybrid materials . Recently, 3-(pyrazin-2-yl)-5-(1 H -1,2,4-triazol-3-yl)-1,2,4-triazolyl (pytty) has attracted our attention, as it has more coordination sites than imidazole ligands.…”

“…On the basis of previous work, , we manage to utilize rigid ligand pytty to extend basket POMs with diverse degrees of reduction by altering the molar ratio of organic ligand and Na 2 MoO 4 , which leads to four basketlike compounds, namely, (H 2 pytty) 8 [{Mn­(H 2 pytty)­(H 2 O) 3 }­{Sr⊂P 6 Mo 6 V Mo 12 VI O 73 }] 2 ·16H 2 O­( 1 ),[{Mn­(H 3 pytty)­(H 2 O) 3 } 2 ­{Sr⊂P 6 Mo 4 V Mo 14 VI O 73 }]·18H 2 O ( 2 ), (H 3 pytz)­(H 2 pytty) 2 [{Fe­(H 2 O) 4 }­{Sr⊂P 6 Mo 3 V Mo 15 VI O 73 }]·5H 2 O ( 3 ), and (H 2 pytty) 2 [{Cd­(H 2 O) 4 }­{Cd­(H 2 O) 3 (H 2 pytty)}­{Sr⊂P 6 Mo 4 V Mo 14 VI O 73 }]·9H 2 O ( 4 ). Electrochemical and photocatalytic properties of 1 – 4 were investigated in detail.…”