季铵纤维素对苋菜红染料的吸附特性研究
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摘要
采用季铵醚化法制备季铵纤维素,研究季铵纤维素对苋菜红染料(AR)的吸附特性及其再生利用性能。结果表明:季铵纤维素的阳离子度与醚化剂用量呈正相关,季铵纤维素QC-7为最佳AR吸附剂;QC-7吸附AR以单分子层化学吸附为主,其吸附过程符合伪二级动力学模型,等温吸附曲线可用Langmuir和D-R等温吸附模型较好描述;QC-7对AR的吸附能力较强,在AR初始质量浓度为100mol/L、pH为7、QC-7投加量为100mg/L、温度为25℃、吸附90min时的饱和吸附量约为360mg/g,且QC-7对AR的吸附具有较宽pH适用范围(3~9)。依次经0.10mol/L NaOH解吸、0.1mol/L HCl再生的QC-7吸附效果良好,8次循环利用后的QC-7对AR的吸附量可达335.2mg/g,再生率超过90%。
Quarternary ammonium cellulose(QC)was synthesized by etherification method.The adsorption properties of amaranth dye(AR)by QC and the regeneration of QC were studied.The results showed that the cationic degrees was positively associated with the dosage of etherifing agent.QC-7 was the best sorbent for AR.Monolayer chemisorption was dominated the adsorption process.The kinetic data fitted well by pseudo second-order model,and the equilibrium sorption data was best described by the Langmuir and D-R isothermal adsorption model for AR.When pH varied from 3 to 9,adsorption capacity of QC-7 was excellent.The saturation adsorption of AR(intial concentration of 100 mg/L)by QC-7 was about 360 mg/g under these conditions that pH of 7,QC-7 concentration of 100 mg/L,temperature of 25 ℃ and adsorption time of 90 min.QC-7 was regenerated effectively by 0.10 mol/L NaOH and 0.1 mol/L HCl in order.The adsorption capacity of QC-7 was335.2 mg/g after 8 runs.The regeneration rate of adsorption capacity was over 90% of its original value.
Quarternary ammonium cellulose(QC)was synthesized by etherification method.The adsorption properties of amaranth dye(AR)by QC and the regeneration of QC were studied.The results showed that the cationic degrees was positively associated with the dosage of etherifing agent.QC-7 was the best sorbent for AR.Monolayer chemisorption was dominated the adsorption process.The kinetic data fitted well by pseudo second-order model,and the equilibrium sorption data was best described by the Langmuir and D-R isothermal adsorption model for AR.When pH varied from 3 to 9,adsorption capacity of QC-7 was excellent.The saturation adsorption of AR(intial concentration of 100 mg/L)by QC-7 was about 360 mg/g under these conditions that pH of 7,QC-7 concentration of 100 mg/L,temperature of 25 ℃ and adsorption time of 90 min.QC-7 was regenerated effectively by 0.10 mol/L NaOH and 0.1 mol/L HCl in order.The adsorption capacity of QC-7 was335.2 mg/g after 8 runs.The regeneration rate of adsorption capacity was over 90% of its original value.
引文
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[3]SATTERFIELD C N.Kirk-Othmer encyclopedia of chemical technology[M].New YorK:John Wiley&Sons,1995.
[4]HABIBI Y,LUCIA L A,ROJAS O J.Cellulose nanocrystals:chemistry,self-assembly,and applications[J].Chemical Reviews,2010,110(6):3479-3500.
[5]周益名.纳米纤维素复合凝胶的制备和表征及其物化性能增强的研究[D].广州:华南理工大学,2014.
[6]ROY D,SEMSARILAR M,GUTHRIE J T,et al.Cellulose modification by polymer grafting:a review[J].Chemical Society Reviews,2009,38(7):2046-2064.
[7]刘澜.改性稻秆吸附剂表征及处理亚甲基蓝溶液的吸附性能研究[D].重庆:重庆大学,2011.
[8]龚仁敏.天然植物材料作为吸附剂去除水溶液中离子型染料及吸附机理的研究[D].南京:南京大学,2004.
[9]O'CONNELL D W,BIRKINSHAW C,O'DWYER T F.A modified cellulose adsorbent for the removal of nickel(Ⅱ)from aqueous solutions[J].Journal of Chemical Technology and Biotechnology,2006,81(11):1820-1828.
[10]CAI J,ZHANG L.Rapid dissolution of cellulose in LiOH/urea and NaOH/urea aqueous solutions[J].Macromolecular Bioscience,2005,5(6):539-548.
[11]甘亮.纤维素季铵盐处理染料废水的试验研究[D].武汉:武汉科技大学,2014.
[12]赵耀明,李艳明,高洸,等.季铵阳离子纤维素醚的合成[J].华南理工大学学报(自然科学版),2007,35(8):83-88.
[13]邓怀礼,苗树祥,朱俊任.阳离子聚丙烯酰胺P(AM-DAC)阳离子度的测定[J].重庆大学学报,2014,37(1):110-116.
[14]杨帆.生物质基阳离子吸附剂的制备及其对染料吸附的研究[D].合肥:中国科学技术大学,2009.
[15]李依丽,李利平,尹晶,等.污泥活性炭对次甲基蓝废水的吸附[J].环境工程学报,2013,7(8):3059-3064.
[16]姚士芹,施文健,陈肖云,等.季铵型纤维素的红外光谱及对持久性有机污染物的吸附特征[J].光谱学与光谱分析,2009,29(9):2370-2374.
[17]赵磊.阳离子纤维对阴离子染料吸附行为研究[D].大连:大连理工大学,2009.