Abstract. Diffusion in sulfuric acid plays a role in heterogeneous stratospheric processes. Knowledge of diffusion coefficients is required to determine the partitioning of heterogeneous reactions between the bulk and the surface of sulfate aerosol particles. Diffusion coefficients are also needed to analyze time-dependent uptake data to obtain solubilities. In order to provide quantitatively accurate diffusion coefficients, the experimental challenges of measuring solute diffusion in strong electrolyte environments must be overcome. We use a modified diaphragm cell technique and report diffusion coefficients for HC1 and HBr in sulfuric acid solutions from 220 to 300 K. We find that the temperature and viscosity dependence of these measurements follows the equation D = cT/rl, where rl is viscosity, yielding c = 7.8 x 10-8 cm2 cP/s K for HC1 and c = 7.9 x 10-8 cm2 cP/s K for HBr. An empirical equation for predicting diffusion coefficients for other species in sulfuric acid is also presented.

Dye-bearing wastewaters leading to the water pollution and ecological upset is a crucial issue in the textile industry. Herein, we report a facile method using two-dimensional transition metal carbides (MXenes) for the removal of the methylene blue (MB) in the water. The accordion-like V 2 CT x MXene is originally demonstrated to have high and spontaneous adsorption capacity of MB at 111.11 mg•g −1 , thrice over that of Ti 3 C 2 T x as previously reported. The wide lamellar space of V 2 CT x is certain to have large accommodation for MB. The electrostatic interaction effect and hydrogen bond between V 2 CT x and MB not only promote the efficient adsorption process but also provide the selectivity between anionic and cationic dyes. Combined with good reusability, we anticipate that the V 2 CT x MXene is a promising candidate for the removal of cationic dyes from textile-dye-bearing wastewaters.

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