粉煤灰基沸石的制备及对橙黄G吸附性能研究
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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.
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.
引文
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[2] Ahmed S A,Soliman E M.Silica coated magnetic particles using microwave synthesis for removal of dyes from natural water samples:synthesis,characterization,equilibrium,isotherm and kinetics studies[J].Applied Surface Science,2013,284:23-32.
[3] Zhou L M,Jin J Y,Liu Z R,et al.Adsorption of acid dyes from aqueous solutions by the ethylenediamine-modified magnetic chitosan nanoparticles[J].Journal of Hazardous Materials,2011,185(2-3):1045-1052.
[4] Lee J W,Choi S P,Thiruvenkatachari R,et al.Submerged microfiltration membrane coupled with alum coagulation/powdered activated carbon adsorption for complete decolorization of reactive dyes[J].Water Research,2006,40(3):435-444.
[5] Zheng Hongye,Xue Yarong,Liu Changhong.Degradation of malachite green dye by schizophyllum commune cfcc7252[J].Microbiology China,2017,44(1):38-48(in Chinese).郑红叶,薛雅蓉,刘常宏.裂褶菌cfcc7252菌株对孔雀石绿染料的高效降解[J].微生物学通报,2017,44(1):38-48.
[6] Chen W X,Lu W Y,Yao Y Y,et al.Highly efficient decomposition of organic dyes by aqueous-fiber phase transfer and in situ catalytic oxidation using fiber-supported cobalt phthalocyanine[J].Environmental Science&Technology,2007,41(17):6240-6245.
[7] Yao T,Guo S,Zeng,C F,et al.Investigation on efficient adsorption of cationic dyes on porous magnetic polyacrylamide microspheres[J].Journal of Hazardous Materials,2015,292:90-97.
[8] Yang Kai,Zhong Dengjie,Xu Yunlan,et al.Research of dye wastewater treatment using N,F,Ce three doped TiO2/Ti electrodes[J].Journal of Chongqing University of Technology(Natural Science),2017(10):134-139(in Chinese).杨开,钟登杰,徐云兰,等.N,F,Ce三掺杂TiO2/Ti光催化处理染料废水的研究[J].重庆理工大学学报(自然科学),2017(10):134-139,164.
[9] Gueye M,Richardson Y,Kafack F T,et al.High efficiency activated carbons from African biomass residues for the removal of chromium(Ⅵ)from wastewater[J].Journal of Environmental Chemical Engineering,2014,2(1):273-281.
[10] Xiao J D,Qiu L G,Jiang X,et al.Magnetic porous carbons with high adsorption capacity synthesized by a microwave-enhanced high temperature ionothermal method from a Fe-based metal-organic framework[J].Carbon,2013,59:372-382.
[11] Guan Chang,Liu Ling,Liu Yangjie,et al.Effictiveness of acid-dye waste water treated by CaCO3 modified diatomite[J].Science Technology and Engineering,2017,17(23):328-331(in Chinese).关昶,刘伶,刘艳杰,等.碳酸钙改性硅藻土处理酸性染料废水的研究[J].科学技术与工程,2017,17(23):328-331.
[12] Fu Mingxing,Tan Hongbin,Guo Congsheng.Effect of cement solid on the zeolite A absorption ability[J].Bulletin of the Chinese Ceramic Society,2010,29(4):847-851(in Chinese).傅明星,谭宏斌,郭从盛.水泥固化对A型沸石吸附性能的影响[J].硅酸盐通报,2010,29(4):847-851.
[13] Yang Wenhuan,Zhang Xuefeng,Guo Junwen,et al.Study on adsorption performance of ammonia nitrogen by P style zeolite synthesized from fly ash[J].Bulletin of the Chinese Ceramic Society,2012,31(6):1559-1563(in Chinese).杨文焕,张雪峰,郭俊温,等.粉煤灰合成P型沸石及其对氨氮吸附性能研究[J].硅酸盐学报,2012,31(6):1559-1563.
[14] Song Ruiran,Xiao Min,Hu Xiaojun,et al.Adsorption of dye wastewater by NaA zeolite from fly ash by solid transformation method[J].Journal of Synthetic Crystals,2017,46(5):897-902(in Chinese).宋瑞然,肖敏,胡晓钧,等.固相法合成NaA型粉煤灰沸石对染料废水的吸附性能研究.人工晶体学报,2017,46(5):897-902.
[15] Cheng Ting,Chen Chen,Xu Wenjing,et al.Adsorption of heavy metal lead and nickel by zeolite synthesized from fly ash[J].Fly Ash Comprehensive Utilization,2016,5:12-15(in Chinese).程婷,陈晨,许文静,等.粉煤灰合成沸石对重金属铅与镍的吸附性能研究[J].粉煤灰综合利用,2016,5:12-15.
[16] Li Kunqi,Yan Yajing,Pan Yuanfeng,et al.Modified zeolites as adsorbents for removal of methyl orange in wastewater:mechanism and characterization[J].Ion Exchange and Adsorption,2015,31(5):417-429(in Chinese).李琨琪,晏雅婧,潘远凤,等.用于染料吸附的改性沸石吸附剂:机理及功能表征[J].离子交换与吸附,2015,31(5):417-429.
[17] Cheng J J,Shi L J,Lu J J,et al.Amino ionic liquidsmodified magnetic core/shell nanocomposite as an efficient adsorbent for dye removal[J].Journal of Industrial and Engineering Chemistry,2016,36:206-214.
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