Quaternary Ammonium Functionalized Lignosulfonate for Simultaneous Adsorption of Anionic/Cationic Dyes and Desinfection.

Although various adsorbents have been developed for sewage treatment, only a few adsorbents can simultaneously adsorb anions/cations and disinfect. In this work, a quaternary lignosulfonate (Q‐LSP) was prepared, which can not only simultaneously adsorb anion and cation pollution, but also disinfect. FT‐IR, XPS were employed to confirm successful preparation of Q‐LSP. The Q‐LSP adsorbs cationic dye methylene blue (MB) and anionic dye Congo red (CR) favorably, and the maximum qe of Q‐LSP to MB and CR are 153 and 324 mg/g respectively according to Langmuir isotherm model. The Langmuir isotherm and pseudo‐second‐order kinetic models are more suitable to describe the adsorption process of MB and CR on Q‐LSP. In binary system containing MB and CR, Q‐LSP can simultaneously adsorb MB and CR, with MB adsorbed preferentially. The Q‐LSP loaded MB or CR is easily regenerated, and the adsorption properties of regenerated Q‐LSP only decreases by 9.2 % to CR and 9.6 % to MB respectively after 4 desorption‐resorption cycles. Moreover, the Q‐LSP can disinfect by leaking endogenous chemicals. Therefore, the Q‐LSP can be used as a new adsorbent possessing performance of simultaneously adsorbing anionic/cationic pollutants and bactericidal activities. [ABSTRACT FROM AUTHOR]