Efficient capture of nitrobenzene from waste water using metal–organic frameworks

A decade update on solvent and catalyst-free neat organic reactions: a step forward towards sustainability

New-style adsorbents of p-tert-butyl-calix[4,6,8]arene-bonded silica gel—CnABS (C4ABS, C6ABS, C8ABS)—were prepared by bonding p-tert-butyl-calix[4,6,8]arene to the silica gel surface through the coupling reagent, 3-glycidoxypropyltrimethoxysilane. The products were characterized by FTIR, thermogravimetry, elemental analysis, and scanning electron microscopy. The adsorption of methylene blue from aqueous solution by CnABS was studied. Kinetic studies showed that the adsorption of the dye onto CnABS fit a first-order kinetic model. The equilibrium adsorption data were interpreted using the Langmuir and Freundlich models. The adsorption of methylene blue onto CnABS was better represented by the Langmuir equation. The saturation adsorption quantity monotonically increased with the number of phenolic units in the calixarene ring. The thermodynamic parameters for the adsorption reaction were calculated through a van’t Hoff analysis. The whole adsorption process was endothermic, which resulted in an increase of ...

Adsorption Kinetics and Thermodynamics of Methylene Blue onto p-tert-Butyl-calix[4,6,8]arene-Bonded Silica Gel

Influence of plant radial oxygen loss in constructed wetland combined with microbial fuel cell on nitrobenzene removal from aqueous solution.

A stable aqueous inclusion complex of fullerene (C60) with macromolecules (C60 concentration as high as 3 × 10−4 mol L−1) was achieved by a one-step strategy using γ-cyclodextrin polymer (γ-CDP). The inclusion complex of C60 with γ-CDP (C60–γ-CDP) was characterized by ultraviolet-visible, Raman and 1H-NMR spectroscopies, powder X-ray diffraction analysis, and thermogravimetric analysis. The supramolecular interactions and the equilibrium constant for a 1 : 2 (C60 : CD unit in γ-CDP) complex of C60 with γ-CDP were studied. Under ultraviolet A (UVA) irradiation C60–γ-CDP in water could generate singlet oxygen, which was detected by electron paramagnetic resonance spectroscopy. We also evaluated the cytotoxicities of C60–γ-CDP, and investigated the phototoxicity of C60–γ-CDP and pristine C60 toward B16-F10 melanoma cells. The cell viability test showed that C60–γ-CDP had a significantly higher photodynamic ability than that of the pristine C60 under UVA irradiation. This work demonstrated both a CDP-functionalized strategy for enhancing the water-solubility and phototoxicity of fullerenes for applications in cancer photodynamic therapy, as well as remediating the negative biological effects of pristine fullerenes.

Ming Chen

Papers

Adsorption, desorption and condensation of nitrobenzene solution from active carbon: a comparison of two cyclodextrins and two surfactants.