Optimized preparation of gangue waste-based geopolymer adsorbent based on improved response surface methodology for Cd(II) removal from wastewater.

Resource utilization of gangue solid waste has become an essential research direction for green development. This study prepared a novel gangue based geopolymer adsorbent (GPA) for the removal of Cd(II) from wastewater using pretreatment gangue (PG) as the main raw material. The ANOVA indicated that the obtained quadratic model of fitness function (R > 0.

Effect of Ionic Liquid Surfactants on Coal Oxidation and Structure.

The effects of six ionic liquids with surfactant property (1-hydroxyethyl-3-methyl imidazolium bis(trifluoromethylsulfonyl)imide ([HOEtMIm][NTf]), 1-hydroxyethyl-3-methyl imidazolium tetrafluoroborate ([HOEtMIm][BF]), 1-dodecyl-3- methyl imidazolium bromide ([CMIm]Br), 1-tetradecyl-3- methyl imidazolium bromide ([CMIm]Br), trioctyl methyl ammonium chloride ([N])Cl, and tetraethyl ammonium chloride ([N]Cl)) on the oxidation characteristics and functional groups of coal were studied by means of critical micelle concentration, surface tension, thermogravimetric analysis, temperature-programmed oxidation, and Fourier transform infrared spectroscopy (FTIR) measurements. The lower critical micelle concentration for the ionic liquids except the [N]Cl suggests the favorable surface activity of these ionic liquids. The surface activities of [N]Cl, [CMIm]Br, [CMIm]Br, and [HOEtMIm][NTf] were high, while that of [N]Cl was relatively lower.