香根草的改性及其对水中六价铬的吸附
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摘要
以N,N-二甲基甲酰胺和乙二胺为改性剂制备出改性香根草吸附剂,用傅里叶变换红外光谱(FTIR)和扫描电镜(SEM)对改性前后的香根草进行表征,结果表明:改性后的香根草引入了更多胺基且其表面活性提高,吸附效果明显改善。在改性香根草用量为3.00 g/L,吸附时间为100 min,温度为314 K,pH为2,Cr~(6+)初始质量浓度为100mg/L时,Cr~(6+)吸附量为72.87 mg/g,Cr~(6+)去除率达97.81%。改性香根草吸附Cr~(6+)的动态吸附平衡符合伪二级动力学模型,等温吸附符合Langmuir吸附等温模型。
N,N-dimethylformamide and ethylenediamine as modifiers have been used for the preparation of the mo-dified vetiver adsorbent,and characterized by fourier transform infrared spectroscopy(FTIR) and scanning electron microscope(SEM). The results show that the modified vetiver can bring in more amine,its surface activity is improved,and its adsorption effect is improved obviously. When the dosage of modified vetiver is 3.00 g/L,adsorption time100 min,temperature 314 K,pH is 2,and initial mass concentration of Cr~(6+)100 mg/L,the adsorption capacity is as high as 72.87 mg/g,and removing rate 97.81%. The dynamic adsorption equilibrium of modified vetiver adsorption for Cr~(6+)is in accordance with the pseudo-second-order kinetics model,and the isothermal adsorption conforms to Langmuir adsorption isothermal model.
N,N-dimethylformamide and ethylenediamine as modifiers have been used for the preparation of the mo-dified vetiver adsorbent,and characterized by fourier transform infrared spectroscopy(FTIR) and scanning electron microscope(SEM). The results show that the modified vetiver can bring in more amine,its surface activity is improved,and its adsorption effect is improved obviously. When the dosage of modified vetiver is 3.00 g/L,adsorption time100 min,temperature 314 K,pH is 2,and initial mass concentration of Cr~(6+)100 mg/L,the adsorption capacity is as high as 72.87 mg/g,and removing rate 97.81%. The dynamic adsorption equilibrium of modified vetiver adsorption for Cr~(6+)is in accordance with the pseudo-second-order kinetics model,and the isothermal adsorption conforms to Langmuir adsorption isothermal model.
引文
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[2]范春辉,贺磊,杜波,等.响应曲面法优化电镀废水中六价铬的吸附去除特性[J].陕西科技大学学报:自然科学版,2014,32(4):19-23.
[3]罗冬,谢翼飞,谭周亮,等. Na OH改性玉米秸秆对石油类污染物的吸附研究[J].环境科学与技术,2014,37(1):28-32.
[4]刘婷,杨志山,朱晓帆,等.改性稻草秸秆对重金属Pb2+吸附作用研究[J].环境科学与技术,2012(s2):41-44.
[5]夏汉平,束文圣.香根草和百喜草对铅锌尾矿重金属的抗性与吸收差异研究[J].生态学报,2001,21(7):1121-1129.
[6]司友斌,包军杰,曹德菊,等.香根草对富营养化水体净化效果研究[J].应用生态学报,2003,14(2):277-279.
[7]梁成凤.生物炭对底泥吸附固定重金属的影响[D].杭州:浙江大学,2014.
[8]谢华林,杨华林.二苯碳酰二肼分光光度法测水中Cr6+[J].湖南文理学院学报(自科版),2001,13(2):65-66.
[9]尤铁学,王楠.二苯碳酰二肼分光光度法测定水中铬(Ⅵ)的改进[J].冶金分析,2006,26(6):84-85.
[10]陈素红.玉米秸秆的改性及其对六价铬离子吸附性能的研究[D].济南,山东大学,2015.
[11] Yoshida S, Ohnishi Y, Kitagishi K. Chemical forms,mobility and deposition of silicon in rice plant[J]. Soil Science&Plant Nutrition,1962,8(3):15-21.
[12] Liu R X,Tang H X,Lo W H. Advances in biosorption mechanism and equilibrium modeling for heavy metals on biomaterials[J]. Progress in Chemistry,2002,14(2):87-92.
[13] Garg V K,Gupta R,Kumar R,et al. Adsorption of chromium from aqueous solution on treated sawdust[J]. Bioresource Technology,2004,92(1):79-80.
[14] Attia A A,Khedr S A,Elkholy S A. Adsorption of chromium ion(Ⅵ)by acid activated carbon[J]. Brazilian Journal of Chemical Engineering,2010,27(1):183-193.
[15] Garg U K,Kaur M P,Garg V K,et al. Removal of hexavalent chromium from aqueous solution by agricultural waste biomass[J]. Journal of Hazardous Materials,2007,140(1/2):60-61.
[16] Pradhan J,Das S N,Thakur R S. Adsorption of hexavalent chromium from aqueous solution by using activated red mud[J]. Journal of Colloid and Interface Science,1999,217(1):137-141.
[17] Zhou L,Wang Y,Liu Z,et al. Characteristics of equilibrium,kinetics studies for adsorption of Hg(Ⅱ),Cu(Ⅱ),and Ni(Ⅱ)ions by thiourea-modified magnetic chitosan microspheres[J]. Journal of Hazardous Materials,2009,161(2):995-1002.