阳离子化稻草纤维对诱惑红吸附性能的研究.

Taking the straw cellulose fiber (SCF) as raw material, bleaching and cationic treatment were carried out to increase its adsorption capacity for anionic substances, so as to prepare an adsorbent for removing allura red (AR) dye from aqueous solution. The SEM results showed that the surface of Cationized straw cellulose fiber (CSCF) was significantly different from SCF, with rounded strips and more obvious fold structures which increased the surface area; the EDS analysis showed that SCF did not contain nitrogen element, but the nitrogen content in CSCF was 4. 19%, which proved that the quaternary ammonium cations were successfully grafted onto the fibers. According to single-factor experiments, the optimal adsorption conditions of AR were as follows: pH of 2, temperature was 30 °C, CSCF dosage was 0. 5 g / L, and the contact time was 180 min. The maximum adsorption capacity of CSCF for AR was 119. 06 mg / g, and the maximum removal rate was more than 99%, which showed that CSCF had a good adsorption effect on AR. The adsorption process can be described by the pseudo-second-order kinetics model and the Langmuir adsorption isotherm model. In summary, CSCF was proved to be an excellent biomass adsorbent. [ABSTRACT FROM AUTHOR]