[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

There is about 700,000 tonnes of dyes, of more than 10,000 types, that are used as coloring agents in industries, mainly for textile. The release of dyes in natural media is of concern due to their high persistence, toxicity and potential to the bioaccumulate in living organisms. In particular, the most commercialized and carcinogenic azo dyes, that pocess a benzidine function, needs urgent attention. Here, we review the current status of cationic and anionic dyes. We present dye removal techniques using nanoparticles through adsorption and degradation. Among dye removal techniques, adsorption was found the most efficient and cheap. For that, conventional adsorbents such as commercial activated carbon, chitosan and natural waste are often employed. We discuss the use of ZnO, TiO2 and Fe0 to remove dye pollution.

Degradation of hazardous organic dyes in water by nanomaterials

Semiconductor-based heteronanostructures with the high carriers-flow steering and high activity and stability in the visible-light-driven multicomponent photocatalytic system have been of great concern due to its long-standing demand in the wide application of environmental protection and energy conversion. However, the construction of ternary-component nanocrystals usally undergos multiple complex steps to restrict its application. In the work, we successfully report the facile design and synthesis of a novel double Z-scheme Zn3(VO4)2/Zn2V2O7/ZnO ternary heteronanostructure system (THS) via self-phase transition with heating on basis of the Zn3(OH)2V2O7·2H2O precursor in a low-cost microwave hydrothermal assistant, which exhibited excellent photocatalytic performances. In this case, the employment of Zn3(OH)2V2O7·2H2O as the heteronanostructure precursor is the key for fabricating the THS material, which not only boosted the interaction with its structure and but also maintained the mesoporous nanosheet structure. It has been proved that Zn3(OH)2V2O7·2H2O firstly lost it H2O and then the partial Zn3(VO4)2 underwent the self-phase transition process to produce Zn2V2O7 and ZnO (Zn3(OH)2V2O7·2H2O → Zn3(VO4)2 → Zn2V2O7 + ZnO), which obtained the double Z-scheme THS. Accordingly, the interfacial-dominated photocatalysis reactivities such as the removal of phenols and dyes were used as ideal experiments to verify the responsibility of the constructed double Z-scheme THS material that was equipped with the narrow band gap, intimate contact interface, the wide visible light absortion and more efficient charge transfer and separation for high visible-light photocatalytic reactivity and stable cycling. PL spectra, radicals trapping experiments and ESR tests confirmed that the nontraditional transport of photoinduced h+ and e− caused by double Z-scheme mechanism played an important role in the efficient removing the target pollutants. Such a synthetic approach maybe render double Z-scheme THS to advance the development for large-scale applications of the hetero-transition metal vanadates.

Phase transformation and microwave hydrothermal guided a novel double Z-scheme ternary vanadate heterojunction with highly efficient photocatalytic performance

Epigrammatic progress and perspective on the photocatalytic properties of BiVO4-based photocatalyst in photocatalytic water treatment technology: A review

In situ fabrication of BiVO4-CeVO4 heterojunction for excellent visible light photocatalytic degradation of levofloxacin

Eco-friendly and green synthesis of BiVO4 nanoparticle using microwave irradiation as photocatalayst for the degradation of Alizarin Red S

Enhancing the visible light induced photocatalytic properties of WO3 nanoparticles by doping with vanadium

A new Schiff base derived from cuminaldehyde and 4-aminoantipyrine and its metal complexes with Co(II), Ni(II), Cu(II) and Zn(II) have been synthesized and characterized. Their structural features have been established on the basis of analytical, magnetic, conductance, IR, UV- visible, mass, 1 H NMR spectral studies. The low conductance values indicate that the complexes are non-electrolytes. On the basis of colour, magnetic moments and electronic spectral data, octahedral geometry was assigned to Co(II) and Ni((II) complexes, while Cu(II) complex showed distorted octahedral arrangement. The antimicrobial activity of the ligand and its complexes has been studied with Escherichia coli, Staphylococcus aureus, Klebsiella pneumonia, Proteus vulgaris, Candida albicans and Aspergillus niger, employing agar-well diffusion method. Both the Schiff base as well as its complexes possess significant antimicrobial activity.

Synthesis, Spectral Characterization and Antimicrobial Studies of Schiff base Transition Metal Complexes derived from Cuminaldehyde and 4-Aminoantipyrine

Crystal structure, chemical nuclease activity, and VHPO mimicking potential of oxovanadium(IV) complexes—A combined experimental and computational study

Two new phenanthroimidazole based highly sensitive and selective bifunctional probes 2-(1H-imidazol-2-yl)-1H-phenanthro[9,10-d]imidazole (PQIM) and 2-(1H-indol-3-yl)-1H-phenanthro[9,10-d]imidazole (PQIN) have been synthesized which could act as ratiometric sensors. Upon addition of analytes, the receptors exhibited pronounced fluoroionophoric behavior on account of internal charge transfer mechanism (ICT). The molecular sensing studies of both the ligands were explored using UV–visible and fluorescence spectroscopic techniques. It has been observed that the receptor PQIM shows better recognition behavior towards Cu2+/F− while the ligand PQIN exhibited enhanced sensing activity towards Co2+/F−. The binding stoichiometry of the receptor and cation/anion complex was probed to be 1:1 from Job’s plot which were further confirmed from ESI mass spectral techniques and 1H NMR titrations. Further, the binding interactions between these ions (Co2+, Cu2+ and F−) with their respective receptors are probed by density functional theory calculations. This study extends our knowledge on designing chemical compounds that could act as chemosensors in selective binding of certain anions/cations and their sensing mechanisms.

R. Biju Bennie

Papers

Eco-friendly and green synthesis of BiVO4 nanoparticle using microwave irradiation as photocatalayst for the degradation of Alizarin Red S

Enhancing the visible light induced photocatalytic properties of WO3 nanoparticles by doping with vanadium

Synthesis, Spectral Characterization and Antimicrobial Studies of Schiff base Transition Metal Complexes derived from Cuminaldehyde and 4-Aminoantipyrine

Crystal structure, chemical nuclease activity, and VHPO mimicking potential of oxovanadium(IV) complexes—A combined experimental and computational study

Designing bifunctional phenanthroimidazole chromophores for highly selective ratiometric chemosensing of Cu2+/F− and Co2+/F− ions in organic solvents