Nickel‐Doped Porous ZnO Nanosheets Functionalized with CuInS₂ Nanoparticles: An Efficient Photocatalyst for Chromium (VI) Reduction

Abstract

Heterojunction nanocomposites comprising Nickel-doped porous ZnO nanosheets decorated with CuInS 2 nanoparticles (CuInS 2 /NiÀ ZnO) were prepared through a facile two-step process. Compared with pure ZnO nanosheets, the Ni doping modifies the energy band structure and narrows the bandgap from 3.1 eV to 2.4 eV, thus enhancing the absorption of visible light. The production of high-quality CuInS 2 /NiÀ ZnO nanosheets with well-matched band energy alignment facilitates effective charge transportation and separation. Benefiting from these favorable properties, the as-prepared CuInS 2 /NiÀ ZnO hetero-junction nanosheets exhibit higher photocatalytic activity for reduction of Cr (VI) than CuInS 2 and NiÀ ZnO in the presence of visible light. The CuInS 2 /NiÀ ZnO-5 (2 % Ni) composite shows the best photocatalytic activity, which is 7.2 and 5.4 times higher than that of the NiÀ ZnO and CuInS 2 . 98 % of Cr (VI) (50 mg/L) can be reduced within 25 min. Moreover, the activity and structure of the CuInS 2 /NiÀ ZnO catalyst are maintained after five cycles. Combining theoretical calculations and experimental results, a possible photocatalysis mechanism of the CuInS 2 / NiÀ ZnO heterojunction nanocomposites is proposed.[a] S.

Carbon Nanotube/ZnIn2S4 Nanocomposites with Efficient Spatial Charge Separation and Migration for Solar H2 Generation

“…These band gap values are all less than the experimental values (Figure 6f), and the band gap energy computed using DFT is generally lower than the actual results. 39 The visible-light absorption range expands as the band gap narrows, boosting photocatalytic activity, which is consistent with the results of UV−vis spectra. Most notably, CNT/ZIS has a different electronic structure from ZIS, indicating that the addition of CNTs can have a significant impact on electronic characteristics.…”

“…While in the case of the CNT/ZIS heterostructure, the band structures become compact and flattened, and the value is 1.90 eV, and it is significantly lower than that of ZIS. These band gap values are all less than the experimental values (Figure f), and the band gap energy computed using DFT is generally lower than the actual results . The visible-light absorption range expands as the band gap narrows, boosting photocatalytic activity, which is consistent with the results of UV–vis spectra.…”

Flower Globose AgIn5S8/AgInS2–SnIn4S8 Heterojunction Composites Constructed by Microwave-Assisted Hydrothermal Synthesis for Enhanced Photocatalytic Efficiency Toward Methyl Orange

“…So far, many ternary sul de materials, such as CdIn 2 S 4 [11] , AgIn 5 S 8 [12] , CuInS 2 [13] , and ZnIn 2 S 4 [14] , have been reported to exhibit a certain capacity of photocatalytic degradation of pollutants under visible light. Therein, SnIn 4 S 8 is a typical ternary sul de compound with good stability and controlled morphology but fast recombination of photogenerated e --h + pairs.…”

Recent Advances in the Preparation and Applications of Organo‐functionalized Porous Materials

“…Metal organic frameworks possess highly crystalline structure and are used for several applications owing to the presence of high surface areas and unique properties imparted by the presence of organic linkers and metal species . The functionalization of the porous materials with inorganic functional groups is also an attractive approach to fabricate materials that could be applied for various applications, however, these might not be suitable application in technologically advanced areas. Eni carbon silicates (ECSs) is a class of hybrid organic‐inorganic materials formed by covalent bonding between organic functional groups and aluminosilicate layers .…”