粉煤灰制备单相态分子筛及对溶液中Cu^(2+)的吸附  

Preparation of Single-phase Molecular Sieve from Fly Ash and Its Adsorption of Cu^(2+) in Solution

作　　者：孙霞[1,2] 黄丽平[1] 钱小军[1] 李健生[2] 

机构地区：[1]淮海工学院化工学院,江苏连云港222001 [2]南京理工大学环境科学与工程系,江苏南京210094

出　　处：《化工环保》2010年第6期539-543,共5页Environmental Protection of Chemical Industry

摘　　要：以粉煤灰为原料,采用两步水热合成法制备分子筛。对所制备的分子筛的晶体类型和形貌进行表征,研究了所制备分子筛对溶液中Cu^(2+)的吸附性能。实验结果表明:控制硅铝凝胶中的m(SiO_2):m(Al_2O_3)分别为1.7和2.9,可得到单相态NaA型分子筛和X型分子筛;硅铝凝胶在100℃的低温条件下晶化,有利于制备小粒径的NaA型分子筛;NaA型分子筛对Cu^(2+)的吸附容量大于X型分子筛;在25℃、溶液初始pH为3、Cu^(2+)质量浓度为50 mg/L、溶液体积为100 mL的条件下,NaA型分子筛最佳加入量为1.5 g,吸附30 min,Cu^(2+)去除率可达95.3%;NaA型分子筛对Cu^(2+)最大吸附容量为82.37 mg/g。The molecular sieve was prepared from fly ash by two-step hydrothermal synthesis process. The crystal types and images of the products were characterized and their adsorption capabilities to Cu2＋ in solution were studied. The experimental results show that： The single-phase NaA type molecular sieve and X type molecular sieve can be successfully prepared when m（ SiO2 ） ： m（ A1203 ） of the silica- alumina gel is 1.7 and 2.9 respectively ; Crystallization at 100℃ is beneficial to synthesize the small- size NaA type molecular sieve; The adsorption capacity of NaA molecular sieve to Cu2＋ is larger than that of X molecular sieve; Under the conditions of 25 ℃, initial solution pH 3, Cu2＋ mass concentration 50 rag/L, solution volume 100 mL, NaA molecular sieve dosage 1.5 g and adsorption time 30 min, the Cu2＋ removal rate can reach 95. 3% ; The maximum adsorption capacity and the adsorption intensity of the NaA molecular sieve are 82.37mg/g and 0. 074 3 g/mg respectively.

关 键 词：粉煤灰 水热合成 分子筛 单相态 硅铝凝胶 吸附 

分 类 号：X705[环境科学与工程—环境工程]