13X/SBA-15复合分子筛的制备及其处理造纸废水的研究

Study on Preparation of 13X/SBA-15 Composite Molecular Zeolite and Its Performance in Treatment of Papermaking Wastewater

关键词:  复合分子筛  后合成法  造纸废水处理

Key Words:composite molecular zeolite  post-synthesis method  papermaking wastewater treatment

摘要:本研究首先对13X分子筛（微孔）和SBA-15分子筛（介孔）进行改性，然后通过后合成法将两种改性分子筛合成为一种复合分子筛，对复合分子筛进行结构表征，并分析了复合分子筛对造纸中段废水的处理效果。结果表明，合成的复合分子筛兼具微孔和介孔结构，比表面积为620.2 m²/g，总孔容为1.15 cm³/g，平均孔径为6.18 nm；废水处理结果表明，在温度40℃、复合分子筛用量为1.0 g/L、pH值为7.8，吸附时间60 min的条件下，复合分子筛对造纸中段废水中色度、固体悬浮物（SS）和COD_Cr的去除率分别可达98.8%、85.7%和81.4%。该复合分子筛具有良好的再生吸附性能，可以多次循环使用。

Abstract:In this study, 13X microporous molecular sieves and SBA-15 mesoporous molecular sieves were functionalized and modified, and then were prepared into a kind of composite molecular sieve by post synthesis method. The structure of the composite molecular sieve was characterized by various methods. Finally, the treatment effect of the wastewater from the middle stage of papermaking was evaluated. The physical characterization experiment showed that the synthesized composite molecular sieve had both microporous and mesoporous structures, with a specific surface area of 620.2 m²/g, a total pore volume of 1.15 cm³/g, and an average pore size of 6.18 nm. The wastewater treatment experiments showed that under the conditions of 60℃, molecular sieve dosage of 1.0 g/L, pH value of 7.8, and adsorption time of 60 mins, the removal rates of chroma, SS and COD_Cr in papermaking wastewater by composite molecular sieve were 98.8%, 85.7% and 81.4%, respectively. The regeneration test showed that the modified composite molecular sieve had good regeneration and adsorption performance and could be reused for many times.