Bimetallic Metal‐Organic Framework Derived ZnO/Ni_0.9Zn_0.1O Nanocomposites for Improved Photocatalytic Degradation of Organic Dyes

Abstract

An optimized structure is of considerable importance for nickle oxide (NiO)‐based materials to achieve high performance as catalyst for contaminant degradation due to the inherent large band gap. Herein, a series of hybrids of NiO nanoparticles doped with zinc oxide (ZnO) semiconductor were fabricated via a facile one‐step calcination of bimetallic metal‐organic frameworks with varied Ni2+/Zn2+ molar ratios (MOF‐NiZn). It is worth noting that partial positions of Ni in NiO lattice are replaced by Zn to form a Ni0.9Zn0.1O phase. Benefiting from the unique hybrid advantage, the rationally designed material could effectively lower the band gap of NiO, thus improving the photocatalytic performance. The optimized ZnO/Ni0.9Zn0.1O‐82 catalyst exhibits the highest degradation activity towards methylene blue (MB) with efficiency up to 97.4 % within 60 min. Additionally, the radicals trapping experiments reveal that the photo‐generated hydroxyl radical (.OH) is the predominant active species during the photodegradation of MB.

Investigation of the Sn4+-distribution and photocatalytic performance of Sn4+/TiO2 hollow fiber nanomaterials

“…Also, the energy gaps (E g ) of TiO 2 and Sn 4+ /TiO 2 -BB50/70 samples were obtained according to the equation of ahn = A(hn À E g ) 2 (where a is the adsorption coefficient, h is Planck's constant, n is the light frequency, and A is energy independent constant). 22 The calculated E g value for Sn 4+ /TiO 2 -BB50/70 is smaller than that of TiO 2 (inset in Fig. S7a, ESI †), further demonstrating the improved photocatalytic performance of the Sn 4+ /TiO 2 -BB50/70 sample.…”

Visible‐Light‐Enhanced Photocatalytic Activities for Degradation of Organics by Chromium Acetylacetone Supported on UiO‐66‐NH2

“…As shown in Figure 4 (XO) and in Figure 5 (TC), the tests were performed at the solution concentration of 30 mg/L. It is well known that the active species produced by the catalysts have a strong effect on removal of pollutant molecules [16] . The results showed that the removal efficiency of pollutants increased when adding more photocatalysts.…”

“…It is well known that the active species produced by the catalysts have a strong effect on removal of pollutant molecules. [16] The results showed that the removal efficiency of pollutants increased when adding more photocatalysts. This can be explained from two aspects.…”

“…Significantly, despite recent reports have illustrated MOFs materials reveal an attractive performance in photocatalytic degradation, [16,17] these materials primarily exhibited photocatalytic activity under UV irradiation because of broad-band gap. Few considerable efforts [18,19] have been dedicated to the modification of MOFs for enhancing the photocatalytic activity under visible light.…”

Facile synthesis and lithium storage performance of tiny oxygen vacancy-enriched zinc manganate nanoparticles anchored on a reduced graphene oxide nanocomposite

“…The binding energy of 22.9 eV between the two peaks verifies a +2 valence for Zn in O-ZMO/rGO. 11,34 In the high-resolution Mn 2p spectrum, the two major peaks can be deconvoluted into four peaks with binding energies of 641.1, 642.7, 652.7, and 654.2 eV (Fig. 2b), which demonstrates the co-existence of +2 and +3 valences.…”