- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Facile synthesis of hierarchically nanostructured bismuth vanadate: An efficient photocatalyst for degradation and detection of hexavalent chromium
摘要： Heterostructured nanomaterials can paid more significant attention in environmental safety for the detection and degradation/removal of hazardous toxic chemicals over a decay. Here, we report the preparation of hierarchically nanostructured shuriken like bismuth vanadate (BiVO4) as a bifunctional catalyst for photocatalytic degradation and electrochemical detection of highly toxic hexavalent chromium (Cr(VI)) using the green deep eutectic solvent reline, which allows morphology control in one of the less energy-intensive routes. The SEM results showed a good dispersion of BiVO4 catalyst and the HR-TEM revealed an average particle size of ca. 5–10 nm. As a result, the BiVO4 exhibited good photocatalytic activity under UV-light about 95% reduction of Cr(VI) to Cr(III) was observed in 160 min. The recyclability of BiVO4 catalyst exhibited an appreciable reusability and stability of the catalyst towards the photocatalytic reduction of Cr(VI). Also, the BiVO4-modified screen printed carbon electrode (BiVO4/SPCE) displayed an excellent electrochemical performance towards the electrochemical detection of Cr(VI). Besides, the BiVO4/SPCE demonstrated tremendous electrocatalytic activity, lower linear range (0.01–264.5 μM), detection limit (0.0035 μM) and good storage stability towards the detection of Cr(VI). Importantly, the BiVO4 modified electrode was also found to be a good recovery in water samples for practical applications.
关键词： Shuriken-shaped BiVO4,Durable bifunctional catalyst,Deep eutectic green solvents,Photocatalytic Cr(VI) reduction,Electrochemical sensing
更新于2025-09-23 15:23:52
-
All Green Solvents for Fabrication of CsPbBr <sub/>3</sub> Films for Efficient Solar Cells Guided by the Hansen Solubility Theory
摘要： Toxic solvents used in the fabrication of perovskite solar cells are an obstacle for their commercialization. Replacing those toxic solvents with green solvents is very important for both ecological environment safety and the health of operators working in manufactory and labs. CsPbBr3-based solar cells have attracted increasing attention due to its high stability. Herein, high-quality CsPbBr3 films are prepared using all green solvents based on a two-step spin-coating method. In the first step, a green solvent system of polyethylene glycol (PEG) with the addition of γ-butyrolactone is used for preparing PbBr2 solutions by matching the Hansen solubility parameters (HSPs) between PbBr2 and the mixed solvent system. By optimizing the HSPs and viscosity, a new complex of PbBr2·(PEG) is formed by spin-coating from the PbBr2 solution, followed by acetic acid dropping while spinning. In the second step, green water is used to dissolve CsBr to prepare a high concentration CsBr/H2O solution. High-quality CsPbBr3 films with full coverage are obtained by spin-coating CsBr/H2O solution onto the PbBr2·(PEG) films after annealing. As a result, a solar cell with configuration of fluorine-doped tin oxide/TiO2/CsPbBr3/carbon exhibits a power conversion efficiency of 8.11% due to its high-quality harvest layer.
关键词： perovskite solar cells,green solvents,Hansen solubility parameters,CsPbBr3,toxicity
更新于2025-09-19 17:13:59