New design and fabrication of Cu3SnS4@C nanostructure for high efficient removal of anionic dye.

Highlights • Cu 3 SnS 4 (CTS) was introduced in adsorption applications for the first time. • CTS has a certain adsorption effect on anionic dyes in aqueous solution. • Surprisingly, CTS@C possess excellent pH-sensitive adsorbability on ramoval of MO. Abstract A new type of strong adsorbent nanostructure Cu 3 SnS 4 @C has been first designed and fabricated by two-step hydrothermal synthesis. For removal of anionic dye methyl orange (MO), in striking contrast to the weak adsorption of bare C nanospheres (0.7 mg/g), the Cu 3 SnS 4 @C nanostructures exhibit a very strong pH-sensitive adsorption performance with a maximum adsorbability of 65.99 mg/g at pH 5.0 and a minimum value of 8.11 mg/g at pH 11.0, in initial concentration of 70 mg/L MO. The samples' adsorption mechanism could be well explained by pseudo-second-order kinetic model. Such significantly enhanced adsorbability of Cu 3 SnS 4 @C could be ascribed to the synergistic adsorption effect of Cu 3 SnS 4 nanoparticles at C nanospheres, which can induce holes transfer and thus lead to massive positive active sites generation on Cu 3 SnS 4 @C available for synergistic adsorption anion dye. [ABSTRACT FROM AUTHOR]