论文部分内容阅读
以海藻酸钠为包埋剂,氯化钙为交联剂,包埋制备了钠基累托石/δ型二氧化锰球形颗粒吸附剂(Na-REC/δ-Mn O_2)。采用傅里叶红外光谱(FTIR)、X射线衍射仪(XRD)和扫描电镜(SEM)对球形颗粒吸附剂进行了表征。研究了海藻酸钠(SA)、钠基累托石/δ型二氧化锰粉末(Na-REC/δ-Mn O_2-F)添加量和氯化钙质量浓度对吸附剂成球性能的影响。探讨了Na-REC/δ-Mn O_2添加量,溶液p H值和吸附时间对吸附结晶紫的影响。结果表明,当添加聚乙二醇2 g,海藻酸钠0.6 g,钠基累托石/δ型二氧化锰粉末3 g,氯化钙质量浓度为1%时,球形颗粒吸附剂的散失率最低,吸附性能最好。在Na-REC/δ-Mn O_2的添加量为30 g/L,溶液p H=7,吸附时间为100 min时,Na-REC/δ-Mn O_2对结晶紫的最大吸附量为122.56 mg/g,吸附过程符合Lagergren准二级动力学方程,膜扩散过程为该吸附过程的控制步骤。球形颗粒吸附剂具有较好的重复使用性能,最优条件下重复使用5次时,对结晶紫的吸附率为61.34%。
Na-REC / δ-MnO_2 was prepared with sodium alginate as embedding agent and calcium chloride as crosslinking agent. The spherical particle adsorbents were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effects of sodium alginate (SA), sodium rectorite / δ-type manganese dioxide powder (Na-REC / δ-Mn O 2 -F) and calcium chloride concentration on the properties of the adsorbent were investigated. The effects of the amount of Na-REC / δ-MnO_2, p H value and adsorption time on the crystal violet adsorption were discussed. The results showed that when adding 2 g of polyethylene glycol, 0.6 g of sodium alginate, 3 g of sodium rectorite / δ-type manganese dioxide powder and 1% of calcium chloride, the loss rate of the spherical particle adsorbent Lowest, best adsorption. The maximum adsorption capacity of Na-REC / δ-Mn O_2 to crystal violet was 122.56 mg / L when the amount of Na-REC / δ-Mn O 2 was 30 g / L, the solution p H = 7 and the adsorption time was 100 min. g, the adsorption process accords with Lagergren quasi-second-order kinetic equation, and the membrane diffusion process is the control step of the adsorption process. The spherical particle adsorbent has good reusability. Under the optimal conditions, the adsorption rate of crystal violet is 61.34% when it is reused for 5 times.