MoS2/壳聚糖复合微粒的制备及其对水体中 Pb(栻)的吸附性能与吸附机制.

In this study, W-MoS2/CS beads were produced by W-MoS2 na no-flower and chitosan (CS), the effect of MoS2 inserting on the morphology and pore structure of composite beads was analyzed,and the adsorption capacity of Pb(II) onto W-MoS2/CS beads were examined by se veral variable s like the pH of the solution, adsorption time, the initial concentration of Pb(II) and coexistence of metal ions during the adsorption process. The results show that: W-MoS2 nanoflowers inserted into the CS gel played a role in fixing and bonding the gel structure, which making the inner structure of beads more solid and the surface of the beads more rough. The W-MoS2/CS beads maintain good pore structure. As the pH value increases in the range of 4 ~ 7, the adsorption capacity of composite beads for Pb ( II ) increased first and then decreased, reaching a maxim urn at pH of 7. The adsorption rate of W-MoS2/CS beads increased sharply before 30 rninutes, and finally reached adsorption equilibrium abo ut 120 minutes. The adsorption of Pb( II) by W-MoS2/CS was well described by the Langmuir isotherm model, which is a typical rnonolayer adsorption, and the theoretical maximum adsorption capacity of W-MoS2/ CS-2 (50 mg MoS2) reached up to 663. 7rng/g,which is much higher than most carbon-based and sulfur-functionalized nanornaterials. At the same tirne, it is found that the W-MoS2/ CS exhibited super selectivity to Pb(II) under the conditions of the coexistence of metal ions. And after 5 regeneration cycles, the adsorption performance of the W-MoS2/CS remained stable, reflecting the excellent reusability of. The design of WMoS2/CS expands the application range of chitosan-based materials in the field of water treatment. [ABSTRACT FROM AUTHOR]