基于氮磷废水处理的沸石多孔吸附材料制备

Preparation of Zeolite Porous Adsorption Material Based on Nitrogen and Phosphorus Wastewater Treatment

摘要:

以改性沸石粉体为原料，采用添加黏结剂和造孔剂方法制备多孔颗粒沸石，重点研究了黏结剂种类、用量、造孔剂种类和用量，水添加量等对颗粒沸石散失率及吸附氨氮、磷酸盐性能的影响.结果表明：聚乙烯醇（PVA）黏结效果优于水泥和羧甲基纤维素钠（CMC），造孔剂碳酸氢钠相比较活性炭效果更佳.扫描电镜（SEM）结果发现添加碳酸氢钠后，颗粒沸石孔径增大，孔隙结构得到明显改善.在改性沸石粉体中添加1.2%PVA、4%碳酸氢钠、40%水制备所得颗粒型沸石散失率为0，且具有较高氮磷吸附性能，对水中氨氮、磷酸盐的去除率高达88.55%和83.11%.吸附动力学实验表明，多孔颗粒型沸石对氮磷的吸附更加符合拟二级动力学模型.

Abstract:

Porous zeolite particles were prepared by adding adhensive and pore former with modified zeolite powder as raw material. The type and addition of adhensive, type and addition of pore-forming agent, water addition on the loss efficiency of the zeolite particle and the effect of the adsorption of nitrogen and phosphorus were focused on. The results show that polyvinyl alcohol (PVA) was better than cement and sodium carboxymethyl cellulose. The effect of sodiumon bicarbonate was better than that of activated carbon, and the micro-morphology of the porous zeolite particles were observed by scanning electron microscopy (SEM) and the results showed that the pore diameter and pore structure of the zeolite particles were significantly improved after adding sodium bicarbonate. The loss efficiency of porous zeolite particles at 0 was made by adding in the modified zeolite powder 1.2% PVA, 4% sodium bicarbonate, 40% water. The results showed a high adsorption of nitrogen and phosphorus, and the removal efficiency of nitrogen and that of the phosphorus in wastewater were 88.55% and 83.11% respectively. The adsorption kinetic of nitrogen, phosphorus on porous zeolite particles was following the pseudo-second-order.