磁性膨润土吸附Cr(Ⅵ)离子解吸再生性能
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摘要
膨润土对重金属离子等污染物具有良好的吸附性能,但吸附饱和后将成为危险固废,处理变成棘手问题,研究其再生循环利用具有较大的经济价值,可为其高效利用提供了有力借鉴和参考。采用NaCl溶液为解吸液,以磁性膨润土为吸附剂,探索Cr(Ⅵ)的解吸条件,并采用XRD、FTIR、BET和SEM表征再生前后样品的结构及形貌,研究材料的稳定性。结果表明:磁性膨润土具有良好的循环使用性能;经过6次吸附-解吸后,磁性膨润土仍保持稳定结构;其解吸过程符合准二级动力学与Langmuir等温方程。
Bentonite has good performance on adsorption of heavy metals and other pollutions. However, it become hazardous solid waste after saturation adsorption and its treatment is a difficult problem. The useful experiences and strong reference for its high effective utilization will be provided. It will take great scientific and economic value to study the regeneration recycling. Desorption regeneration of magnetic bentonite with NaCl desorption solution was studied after Cr(Ⅵ) was adsorbed onto it. The effects of desorption, such as pH and temperature, were explored. The physical or chemical feature of regenerated magnetic bentonite and the original were comparatively analyzed by XRD, FTIR, BET and SEM. The research results show that magnetic bentonite still remains stable structure after repeating six adsorptiondesorption cycles. The desorption process better conforms to the second-order kinetic equation and the Langmuir model.
Bentonite has good performance on adsorption of heavy metals and other pollutions. However, it become hazardous solid waste after saturation adsorption and its treatment is a difficult problem. The useful experiences and strong reference for its high effective utilization will be provided. It will take great scientific and economic value to study the regeneration recycling. Desorption regeneration of magnetic bentonite with NaCl desorption solution was studied after Cr(Ⅵ) was adsorbed onto it. The effects of desorption, such as pH and temperature, were explored. The physical or chemical feature of regenerated magnetic bentonite and the original were comparatively analyzed by XRD, FTIR, BET and SEM. The research results show that magnetic bentonite still remains stable structure after repeating six adsorptiondesorption cycles. The desorption process better conforms to the second-order kinetic equation and the Langmuir model.
引文
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[17]关文斌,赵彬侠,邱爽,刘楠,牛露,陈蓉,孙烨.Cr(Ⅵ)在改性蒙脱土上吸附行为的研究[J].西北大学学报(自然科学版),2016,46(3):375-380.GUAN Wen-bin,ZHAO Bin-xia,QIU Shuang,LIU Nan,NIULu,CHEN Rong,SUN Ye.The adsorption behavior of Cr(Ⅵ)on modified montmorillonite[J].Journal of Northwest University(Natural Science Edition),2016,46(3):375-380.
[18]吴萍萍,曾希柏,白玲玉.不同类型土壤中As(Ⅴ)解吸行为的研究[J].环境科学学报,2011,31(5):1004-1010.WU Ping-ping,ZENG Xi-bai,BAI Lin-yu.The arsenate adsorption behavior of seven Chinese soils[J].Acta Scientiae Circumstantiae,2011,31(5):1004-1010.
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[21]WANG D,WANG G H,LI W B,CHEN K,LU L L,HU Q.Adsorption and heterogeneous degradation of rhodamine B on the surface of magnetic bentonite material[J].Applied Surface Science,2015,349:988-996.
[2]徐媛媛,辛晓东,郑显鹏,于海琴,闫良国,杜斌.改性膨润土吸附重金属离子的研究与应用进展[J].工业水处理,2009,29(5):1-4.XU Yuan-yuan,XIN Xiao-dong,ZHENG Xian-peng,YUHai-qin,YAN Liang-guo,DU Bin.Study on the adsorption of heavy metals with modified bentonite and its applied progress[J].Industrial Water Treatment,2009,29(5):1-4.
[3]ZENG L,WANG S,PENG X,GENG J Q,CHEN C Y,LI M.Al-Fe PILC preparation,characterization and its potential adsorption capacity for aflatoxin B1[J].Applied Clay Science,2013,s83/84:231-237.
[4]邢奕,刘敏,洪晨,张莹莹,王康,赵晓明,田星强.石墨烯改性有机膨润土吸附性能及其动力学[J].工程科学学报,2016,38(3):438-445.XING Yi,LIU Min,HONG Chen,ZHANG Ying-ying,WANGKang,ZHAO Xiao-ming,TIAN Xing-qiang.Adsorption performance and kinetics of organobentonite modified with graphene[J].Chinese Journal of Engineering,2016,38(3):438-445.
[5]程文强.Al-Ti柱撑膨润土的制备及对砷的吸附性能研究[D].成都:成都理工大学,2014.CHENG Wen-qiang.The preparation of Al-Ti pillared bentonite and its adsorption properties of arsenic[D].Chengdu:Chengdu University of Technology,2014.
[6]邹成龙,梁吉艳,姜伟,沈欣军,孟静.膨润土吸附处理污染物的再生研究进展[J].硅酸盐通报,2017,36(9):3020-3023.ZOU Cheng-long,LIANG Ji-yan,JIANG Wei,SHEN Xin-jun,MENG Jing.Research progress on regeneration of bentonite adsorbing pollutions[J].Bulletin of the Chinese Ceramic Society,2017,36(9):3020-3023.
[7]LIAN L L,CAO X L,WU Y Q,SUN D Z,LOU D W.A green synthesis of magnetic bentonite material and its application for removal of microcystin-LR in water[J].Applied Surface Science,2014,289(8):245-251.
[8]KAUFHOLD S,DOHRMAN R,UFER K,MEYER F M.Comparison of methods for the quantification of montmorillonite in bentonites[J].Applied Clay Science,2002,22(3):145-151.
[9]CHEN Y G,HE Y,YE W M,SUI W H,XIAO M M.Effect of shaking time,ionic strength,temperature and pH value on desorption of Cr(Ⅲ)adsorbed onto GMZ bentonite[J].Transactions of Nonferrous Metals Society of China,2013,23(11):3482-3489.
[10]LI S C,WANG X L,HUANG Z Y,DU L,ZHANG D,TAN Z Y,FU Y B,WANG X L.Sorption-desorption hysteresis of uranium(Ⅵ)on/from GMZ bentonite[J].Journal of Radioanalytical&Nuclear Chemistry,2016,310(2):1-8.
[11]曹晓强,陈亚男,张燕,邱俊,李琳,吕宪俊,赵晓菲.蒙脱石表面电荷特性研究及模拟[J].功能材料,2016,47(4):4152-4156.CAO Xiao-qiang,CHEN Ya-nan,ZHANG Yan,QIU Jun,LI Lin,LüXian-jun,ZHAO Xiao-fei.Study and modeling surface charge characteristics of montmorillonite[J].Journal of Functional Materials,2016,47(4):4152-4156.
[12]WECKHUYSEN B M,WACHS I E,SCHOONHEYDT R A.Surface chemistry and spectroscopy of chromium in inorganic oxides[J].Chemical Reviews,1996,96(8):3327-3349.
[13]揭诗琪,乔丽媛,李明明,柳若霖,冯雨晴,朱建裕,覃文庆.改性生物质材料对Cr(Ⅵ)的吸附性能[J].中国有色金属学报,2015,25(5):1362-1369.JIE Shi-qi,QIAO Li-yuan,LI Ming-ming,LIU Ruo-lin,FENGYu-qing,ZHU Jian-yu,QIN Wen-qing.Adsorption properties of Cr(Ⅵ)by modified biomass materials[J].The Chinese Journal of Nonferrous Metals,2015,25(5):1362-1369.
[14]周仲魁,徐少辉.铝柱撑改性膨润土处理电镀废水中Cr(Ⅵ)的实验研究[J].工业水处理,2012,32(12):55-57.ZHOU Zhong-kui,XU Shao-hui.Experimental study on the treatment of Cr6+in electroplating wastewater by aluminum pillared modified bentonite[J].Industrial Water Treatment,2012,32(12):55-57.
[15]李虎杰.膨润土对重金属离子的吸附作用[J].中国矿业,2005,14(2):44-46.LI Hu-jie.Adsorption of heavy metal ions with bentonite[J].Chinese mining industry,2005,14(2):44-46.
[16]JIN X Y,JIANG M Q,DU J H,CHEN Z L.Removal of Cr(Ⅵ)from aqueous solution by surfactant-modified kaolinite[J].Journal of Industrial and Engineering Chemistry,2014,20(5):3025-3032.
[17]关文斌,赵彬侠,邱爽,刘楠,牛露,陈蓉,孙烨.Cr(Ⅵ)在改性蒙脱土上吸附行为的研究[J].西北大学学报(自然科学版),2016,46(3):375-380.GUAN Wen-bin,ZHAO Bin-xia,QIU Shuang,LIU Nan,NIULu,CHEN Rong,SUN Ye.The adsorption behavior of Cr(Ⅵ)on modified montmorillonite[J].Journal of Northwest University(Natural Science Edition),2016,46(3):375-380.
[18]吴萍萍,曾希柏,白玲玉.不同类型土壤中As(Ⅴ)解吸行为的研究[J].环境科学学报,2011,31(5):1004-1010.WU Ping-ping,ZENG Xi-bai,BAI Lin-yu.The arsenate adsorption behavior of seven Chinese soils[J].Acta Scientiae Circumstantiae,2011,31(5):1004-1010.
[19]BEREZ A,AYARI F,ABIDI N,TRABELSI-AYADI N,SCHAFER M.Adsorption-desorption processes of azo dye on natural bentonite:Batch experiments and modelling[J].Clay Minerals,2014,49(5):747-763.
[20]刘霞,邓红侠,张萌,王建涛,杨亚提.不同解吸剂对污染塿土铜铅的解吸动力学研究[J].西北农林科技大学学报(自然科学版),2011,39(12):159-165.LIU Xia,DENG Hong-xia,ZHANG Meng,WANG Jian-tao,YANG Ya-ti.Kinetics of copper and lead desorption from Lou soil as affected by different desorption agents[J].Journal of Northwest Sci-Tech University of Agriculture and Forestry(Natural Science Edition),2011,39(12):159-165.
[21]WANG D,WANG G H,LI W B,CHEN K,LU L L,HU Q.Adsorption and heterogeneous degradation of rhodamine B on the surface of magnetic bentonite material[J].Applied Surface Science,2015,349:988-996.