改性烟草秸秆对水中刚果红的吸附和解吸

以改性烟草秸秆（AD-MTS）为吸附剂，研究其投加量和溶液pH对水中刚果红去除效果的影响，并探讨了不同解吸条件对AD-MTS解吸效果的影响以及AD-MTS再生的可行性。结果表明，AD-MTS对溶液中刚果红具有良好的去除效果，0.02 g AD-MTS对25 mL浓度为100 mg·L-1刚果红的去除率达99.44%，且在酸性溶液中有利于AD-MTS对刚果红的去除。NaOH能实现刚果红的有效解吸，以0.05 mol·L-1 NaOH为解吸剂，在常温下解吸30 min，对吸附刚果红饱和的AD-MTS的解吸率达72.15%，在此解吸条件下，对AD-MTS进行3次吸附-解吸实验，表明NaOH溶液可以实现AD-MTS多次再生利用。

Adsorption and desorption performance of modified tobacco stalks on Congo Red in aqueous solution

Tobacco stalks were modified (AD-MTS) and were employed as adsorbents. The effect of AD-MTS dose and pH on Congo Red removal in aqueous solution was investigated and the effects of desorption conditions and the feasibility of recovering AD-MTS from the aqueous solution were discussed. Results showed that AD-MTS exhibited good removal efficiency for Congo Red. The removal rate can reach 99.44% with 0.02 g AD-MTS in 25 mL Congo Red solution (100 mg·L-1). Moreover, acidic condition was beneficial to the removal. Desorption of Congo Red can be achieved by NaOH (0.05 mol·L-1) in 30 min at 20℃, and the desorption by NaOH can reach 72.15% when saturated AD-MTS was employed. Under the same desorption conditions, AD-MTS was applied for 3 runs of adsorption-desorption, indicating that NaOH can be used for recycling AD-MTS as an adsorbent.