以粉煤灰为原料制备高纯度NaP型分子筛

Preparation of pure NaP zeolite by using flying ash

以工业固体废弃物粉煤灰为原料,经分级处理后提取其中的硅铝元素(Na_2SiO_3和NaAlO_2),通过水热合成法制备高纯度NaP型分子筛。考察了硅铝比、水硅比、晶化时间和晶化温度对NaP型分子筛制备的影响,采用XRD、SEM、FTIR和DTA-TG对NaP型分子筛的晶型、形貌、热稳定性进行分析表征,并考察了NaP分子筛对Cu^(2+)的吸附性能。实验结果表明,当H_2O/Si为120、Si/Al为1.0,晶化温度为115℃、晶化时间9h时,可得到高纯度NaP型分子筛。合成的NaP型分子筛可有效地吸附Cu^(2+),温度升高有助于分子筛吸附能力的提升,当吸附温度为45℃,吸附120min时,Cu^(2+)的最大去除率可达98.3%。

Taking Na2SiO3 and Na AlO2,obtained from coal fly ash by staged treatment,as raw material,Na P zeolites were synthesized via hydrothermal synthesis method. The influences of the value of Si / Al,H2O / Si,crystallization temperature and crystallization time on the preparation of Na P zeolite were investigated. The crystal form,morphology and thermal stability of Na P zeolite were characterized by XRD,SEM,FT-IR and DTA-TG. The performance evaluation was carried out by the adsorption experiment of Cu^2＋. The results show that Na P zeolite with high purity was obtained at the ratios of H_2O / Si = 120,Si / Al = 1. 0,the reaction temperature of 115℃,crystallization time of 9 h. Cu^2＋ in the liquid could be adsorbed by zeolite production effectively and the enhancement of adsorption temperature had a positive effect on the adsorption capacity. The maximum removal rate of Cu^2＋ was around 98. 3% under the conditions of 45℃ and 120 min.