粉煤灰制备SOD型沸石及其对Cs^+的吸附特性研究  

Adsorption Characteristics of Cs^+ by SOD-type Zeolite Synthesized from Fly Ash

作　　者：张海军[1,2] 罗洁[3,2] 王亚举[3] 杨剑[4,2] 黄胜[3] 

机构地区：[1]西南科技大学理学院 [2]固体废物资源化教育部重点实验室,四川绵阳621010 [3]西南科技大学环境与资源学院 [4]西南科技大学应用技术学院,四川绵阳621010

出　　处：《环境科学与技术》2016年第4期114-120,共7页Environmental Science & Technology

基　　金：西南科技大学博士科研基金(11zx7112);西南科技大学研究生创新基金资助(15ycx041)

摘　　要：利用工业废物粉煤灰为原料,在传统碱熔-水热法中引入脱硅工艺合成SOD型沸石,通过X射线衍射和扫描电镜进行表征,并研究了在不同条件下合成沸石对Cs^+的吸附特性。采用静态平衡实验方法获得Cs^+的吸附实验数据,考察不同因素对Cs^+吸附量的影响。结果表明,合成沸石的吸附性能比原状粉煤灰有了显著提高,当初始浓度为200 mg/L时,其对Cs^+的吸附率仍能达到80%以上;吸附量随着pH的增加先增大后减小,最适pH为10;离子强度的增加将抑制吸附行为;提高初始浓度有利于吸附量的增大,但须通过调节固液比兼顾吸附量与吸附率的关系;以Langmuir方程拟合得到理论最大吸附量为28.53 mg/g。合成沸石对Cs^+的吸附能力相比原状粉煤灰有显著提高,通过考察离子强度对吸附行为的影响可推测Cs^+与合成沸石形成外层表面络合物。SOD-type zeolite was prepared by alkali fusion-desilication-hydrothermal method using fly ash as raw material and characterized by X ray diffraction and scanning electron microscope. In addition,the adsorption characteristics of Cs^＋ on the zeolite under different conditions were investigated. The experimental data of Cs^＋ were obtained by the static test method and the effects of different factors on the adsorption capacity of Cs^＋ were investigated. It was found that the adsorption performance of synthetic zeolite was significantly improved than the original fly ash. When initial concentration was 200mg/L,the adsorption rate was still more than 80%.With the increasing of pH,the adsorption capacity increased first and then decreased,with the optimal pH as 10. Increasing ionic strength would inhibit the adsorption behavior. Improving the initial concentration are in favor of the increase of the adsorption capacity,but the relationship between adsorption capacity and adsorption rate should be regulated by adjusting the ratio of solid to liquid. The theoretical maximum adsorption capacity of 28.53 mg/g is obtained by the Langmuir equation. Compared with the fly ash,the adsorption capacity of Cs^＋ on synthetic zeolite is greatly improved. By investigating the influence of ionic strength on the adsorption behavior,it can speculate that Cs^＋ and synthetic zeolite formed the outer surface complexes.

关 键 词：粉煤灰 沸石 Cs^+ PH 离子强度 

分 类 号：X705[环境科学与工程—环境工程]