摘要
以戊二醛作为交联剂制备聚乙烯亚胺PEI改性的废弃茶叶渣,进行SEM表征,并研究其对染料废水中刚果红的吸附性能。在单因素的基础上,通过中心组合试验设计原理,运用Box-Behnken响应面法对PEI-WT的吸附工艺进行优化。以初始pH值、吸附温度和PEI-WT吸附剂投加量为考察因素,进行三因素三水平试验,并获得多元二次回归方程。结果表明,PEI改性废弃茶叶渣吸附刚果红的最佳工艺条件为:初始pH为7.71、吸附温度为50.92℃和PEI-WT投加量为0.10 g。在此优化条件下,PEI-WT对水中刚果红的吸附最大量为11.46 mg/g,PEI-WT单位吸附量与模型预测值无显著性差异,表明通过响应面法优化的方程具有一定的实践指导意义。吸附完成后,将废弃PEI-WT制成花盆。
Glutaraldehyde was used as a crosslinking agent to prepare polyethyleneimine PEI modified waste tea dregs, which was characterized by SEM, and its adsorption performance for Congo red in dye wastewater was studied. On the basis of single factor, using the Box-Behnken response surface method to optimize the adsorption process of PEI-WT through the central combination experiment design principle. Taking the initial pH value, adsorption temperature and PEI-WT adsorbent dosage as the investigating factors, a three-factor three-level test was performed, and a multiple quadratic regression equation was obtained. The results showed that the optimal process conditions for the adsorption of Congo red by PEI modified waste tea residue were: the initial pH was 7.71, the adsorption temperature was 50.92˚C and the dosage of PEI-WT was 0.10 g. Under this optimized condition, there is no significant difference between the unit adsorption capacity of PEI-WT and the predicted value of the model, indicating that the equation optimized by the response surface method has certain practical guiding significance. After the adsorption is completed, the waste PEI-WT is made into a flower pot.
出处
《环境保护前沿》
2020年第5期782-792,共11页
Advances in Environmental Protection
关键词
PEI
改性
茶叶渣
吸附
刚果红
PEI Modification
Tea Residue
Adsorption
Congo Red
