摘要
以粉煤灰为原料采用水热合成法制备粉煤灰基沸石,通过X射线粉末衍射(XRD)、扫描电镜(SEM)和氮气吸附孔径分布(BET)进行表征,合成的沸石结晶性好,具有多孔结构。以橙黄G为吸附模型染料,考察了pH值、吸附剂用量、初始浓度、温度和吸附时间等因素对橙黄G的吸附量的影响,探讨了橙黄G染料在粉煤灰基沸石上的吸附行为。结果表明,粉煤灰基沸石对橙黄G具有较好的吸附能力;pH值=4时,吸附量最大;粉煤灰基沸石对橙黄G的吸附符合准二级动力学模型,在60 min内基本达到吸附平衡;25℃下,最大吸附量高达45.6mg/g,Langmuir等温吸附数学模型能较好地拟合粉煤灰基沸石对溶液中橙黄G的吸附,说明该吸附过程是单分子层吸附。
The fly ash zeolite was prepared by hydrothermal method using fly ash as raw material. The prepared adsorbent was characterized by means of SEM, XRD and nitrogen adsorption isotherms (BET). The synthesized fly ash zeolite had perfect crystallinity and was porous. The effects of different pH, fly ash zeolite dosage, initial concentrations, temperature and adsorption time on the adsorption performance of orange G were investigated. The results showed that the synthesized fly ash zeolite had a strong potential for orange G removal. The highest adsorption capacity could be obtained when pH was around 4. The adsorption on the fly ash zeolite reached equilibrium within 60 min and the process followed pseudo-second-order kinetic. Under 25 ℃, the highest adsorption capacity was approximately 45.6 mg/g. Langmuir isothermal adsorption mathematical model could well fit the adsorption of orange G on fly ash-based zeolite, indicating that the adsorption process was monolayer adsorption.
作者
王凯
孙菱翎
邱广明
陈伟伟
蔡金利
WANG Kai;SUN Lingling;QIU Guangming;CHEN Weiwei;CAI Jinli(Inner Mongolia Key Laboratory of Photoelectric Functional Materials,College of Chemistry and Chemical Engineering, Chifeng University, Chifeng 024000, China;School of Energy and Power Engineering, Inner Mongolia University of Technology,Huhhot 010051,China;Sennics Co., Ltd., Tai’an 271413, China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2019年第2期2133-2138,共6页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51263013)
内蒙古自然科学基金资助项目(2015MS0534)
内蒙古自治区高等学校科学研究资助项目(NJZY17302)
关键词
粉煤灰
沸石
橙黄G
吸附
fly ash
zeolite
orange G
adsorption
