龙岩土的插层改性及吸附性能研究
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摘要
为了提高龙岩土对亚甲基蓝的吸附效率,采用尿素对其进行插层改性,并通过投入量及溶液pH值的变化,探究了改性后龙岩土对水溶液中亚甲基蓝的吸附性能。利用XRD及FT-IR测试表征分析插层对龙岩土层间距及层间域性质的变化。结果表明:通过尿素对龙岩土的插层改性,增大了粘土对亚甲基蓝的吸附量,常温下其最大吸附量达到28.49 mg/g,比未改性龙岩土吸附量提高42%。最后通过对改性龙岩土的吸附机理探究表明:改性龙岩土对亚甲基蓝的整个吸附过程符合Langmuir等温方程及伪二级动力学方程。
In order to improve the adsorption of methylene blue(MB), urea was used to modify the Longyan Clay. XRD and FT-IR were used to observe the effect of the intercalation process on d-spacing and property of the interlayer space. The adsorption performance of MB onto the modified Longyan Clay was investigated under different conditions. The results showed the intercalation of urea enhanced the adsorption capacity, the maximum sorption capacity reached 28.49 mg/g, 42% higher than that of the unmodified. The adsorption data of MB onto the modified Longyan Clay was in good agreement with the pseudo-second-order model and followed the Langmuir isothermal equation.
In order to improve the adsorption of methylene blue(MB), urea was used to modify the Longyan Clay. XRD and FT-IR were used to observe the effect of the intercalation process on d-spacing and property of the interlayer space. The adsorption performance of MB onto the modified Longyan Clay was investigated under different conditions. The results showed the intercalation of urea enhanced the adsorption capacity, the maximum sorption capacity reached 28.49 mg/g, 42% higher than that of the unmodified. The adsorption data of MB onto the modified Longyan Clay was in good agreement with the pseudo-second-order model and followed the Langmuir isothermal equation.
引文
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[3]任南琪,周显娇,郭婉茜,等.染料废水处理技术研究进展[J].化工学报,2013,(1):84-94.REN N Q,ZHOU X J,GUO W Q,et al.CIESC Journal,2013,(1):84-94.
[4]曹根庭,薛继龙,夏盛杰,等.不同阴离子插层锌铝水滑石对亚甲基蓝的光催化性能(英文)[J].硅酸盐学报,2016,(5):726-7CAO G T,XUE J L,XIA S J,et al.Journal of the Chinese Ceramic Society,2016,(5):726-732.
[5]EL-MEKKAWI D M,IBRAHIM F A,SELIM M M.Removal of methylene blue from water using zeolites prepared from Egyptian kaolins collected from different sources[J].Journal of Environmental Chemical Engineering,2016,4(2):1417-1422.
[6]张汀兰.伊利石粘土的插层改性研究[D].华北理工大学,2017.
[7]EZZIANE K,BELOUATEK A,HMIDA E S B H.Treatment of dye and cadmium solutions using asymmetric kaolin porous tubular support[J].Desalination,2010,250(1):418-422.
[8]SHIRZAD-SIBONIAB M,KHATAEEC A,HASSANIDE A,et al.Preparation,characterization and application of a CTAB-modified nanoclay for the adsorption of an herbicide from aqueous solutions:Kinetic and equilibrium studies[J].Comptes Rendus Chimie,2015,18(2):204-214.
[9]张兰河,苑亚会,颜增光,等.纳米伊/蒙黏土对水体中重金属的吸附去除效果[J].环境科学研究,2016,(1):115-123.ZHANG L H,YUAN Y H,YAN Z G,et al.Research of Environmental Sciences,2016,(1):115-123.
[10]郭亚丹,梁平,李效萌,等.改性累托石吸附溶液中铀U(Ⅵ)的研究[J].中国陶瓷.2014,(7):24-27.GUO Y D,LIANG P,LI X M,et al.China Ceramics,2014,(7):24-27.
[11]WANG L,ZHANG J P,WANG A Q.Fast removal of methylene blue from aqueous solution by adsorption onto chitosan-g-poly(acrylic acid)/attapulgite composite[J].Desalination,2011,266(1-3):33-39.
[12]彭书传,王诗生,陈天虎,等.凹凸棒石吸附水溶性染料的热力学研究[J].硅酸盐学报,2005,(8):1012-1017.PENG S H,WANG S S,CHEN T H,et al.Journal of the Chinese Ceramic Society,2005,(8):1012-1017.
[13]马宏飞,李晨晨,李薇,等.高岭土对亚甲基蓝的吸附性能和等温吸附模型研究[J].应用化工,2016,(3):496-500.MA H F,LI C C,LI W,et al.Applied Chemical Industry,2016,(3):496-500.
[14]JIN X Y,JIANG M Q,SHAN X Q,et al.Adsorption of methylene blue and orange II onto unmodified and surfactantmodified zeolite[J].Journal of Colloid and Interface Science,2008,328(2):243-247.