海藻酸钠基吸附材料对铁离子的吸附动力学研究
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摘要
以海藻酸钠-β-环糊精-聚乙烯醇为原料制备海藻酸钠基吸附剂(SA-β-CD-PVA),并考察其对于铁离子的吸附性能。通过吸附实验,分析材料吸附性能,并采用3种不同的吸附模型对吸附Fe~(3+)的实验结果进行理论分析。实验结果表明:在温度30—50℃范围内,准二级动力学模型能够很好地描述SA-β-CD-PVA对Fe~(3+)的吸附状况(R~2>0.99)。该吸附过程是一个化学反应速率控制的吸附过程,吸附活化能为74.13 kJ/mol,吸附焓变为-6.406 kJ/mol。SA-β-CD-PVA吸附剂对Fe~(3+)的吸附模式更加符合Langmuir等温方程(R~2>0.99),表明Fe~(3+)在SA-β-CD-PVA吸附剂上的吸附模式是更接近于单分子吸附。
Sodium-alginate-based adsorbent(SA-β-CD-PVA) was prepared using sodium alginate, β-cyclodextrin and polyvinyl alcohol as raw materials. Its adsorption properties for iron ions were also investigated through adsorption experiments. Three different adsorption models were used to analyze the experimental results of Fe~(3+) adsorption. The experimental results figure out that the pseudo-second-order kinetic model can well describe the adsorption of Fe~(3+) on SA-β-CD-PVA(R~2>0.99). The adsorption process is a chemical reaction rate-controlled adsorption process. The adsorption activation energy is 74.13 kJ/mol and the adsorption enthalpy is-6.406 kJ/mol. The adsorption mode of Fe~(3+) on SA-β-CD-PVA adsorbent was more in line with Langnuir isothermal equation(R~2>0.99), which indicated that the adsorption mode of Fe~(3+) on SA-β-CD-PVA adsorbent was closer to that of single molecule.
Sodium-alginate-based adsorbent(SA-β-CD-PVA) was prepared using sodium alginate, β-cyclodextrin and polyvinyl alcohol as raw materials. Its adsorption properties for iron ions were also investigated through adsorption experiments. Three different adsorption models were used to analyze the experimental results of Fe~(3+) adsorption. The experimental results figure out that the pseudo-second-order kinetic model can well describe the adsorption of Fe~(3+) on SA-β-CD-PVA(R~2>0.99). The adsorption process is a chemical reaction rate-controlled adsorption process. The adsorption activation energy is 74.13 kJ/mol and the adsorption enthalpy is-6.406 kJ/mol. The adsorption mode of Fe~(3+) on SA-β-CD-PVA adsorbent was more in line with Langnuir isothermal equation(R~2>0.99), which indicated that the adsorption mode of Fe~(3+) on SA-β-CD-PVA adsorbent was closer to that of single molecule.
引文
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[3] 于长江,颜杨婕,凌玉,等.海藻酸钠复合吸附材料研究进展[J].海南师范大学学报:自然科学版,2017,30(2):154-160.
[4] 邓景衡,余侃萍,肖国光,等.吸附法处理重金属废水研究进展[J].工业水处理,2014(11):4-7.
[5] 李鸿玉,厉重先,李祖明.海藻酸钠固定化果胶酶的研究[J].食品科技,2010,35(4):21-24.
[6] 高志敏.海藻酸钠基复合吸附材料的制备及对重金属离子的吸附研究[D].济南:山东建筑大学,2016.
[7] GOTOH T,MASUSHIMA K,KIKUCHI K.Preparation of alginate-chitosan hybrid gel beads and adsorption of divalent metal ions [J].Chemosphere,2004,55:135-140.
[8] DEWANGAN T,TIWARI A,BAJPAI A K.Removal of cobalt Ions from aqueous solution by adsorption onto cross-linked calcium alginate beads[J].Journal of Dis-persion Science and Technology,2009,30(1):56-60.
[9] KAUSHAL M,TIWARI A.Removal of rhodamine-B from aqueous solution by adsorption onto cross-linked alginate beads[J].Journal of Dispersion Science and Technology,2010,31(4):438-441.
[10] 罗莹,刘有智,祁贵生,等.紫外可见分光光度法测定络合铁离子浓度[J].天然气化工(C1化学与化工),2013,38(5):75-78.
[11] 王燕.水样中微量铁离子浓度测定的微型实验设计[J].南京医科大学学报:自然科学版,2000,20(3):224-225.
[12] 岳钦艳,解建坤,高宝玉,等.污泥活性炭对染料的吸附动力学研究[J].环境科学学报,2007,27(9):1431-1438.
[13] 王宇,高宝玉,岳文文,等.改性玉米秸秆对水中磷酸根的吸附动力学研究[J].环境科学,2008,29(3):703-708.
[14] 丁世敏,封享华,汪玉庭,等.交联壳聚糖多孔微球对染料的吸附平衡及吸附动力学分析[J].分析科学学报,2005,21(2):127-130.
[15] 刘继芳,曹翠华,蒋以超,等.重金属离子在土壤中的竞争吸附动力学初步研究Ⅱ.铜与镉在褐土中竞争吸附动力学[J].中国土壤与肥料,2000(3):30-101.
[16] 舒月红,贾晓珊.CTMAB-膨润土从水中吸附氯苯类化合物的机理——吸附动力学与热力学[J].环境科学学报,2005,25(11):1530-1536.
[17] 赵新东,李延辉,吴少玲,等.海藻酸钠/氧化石墨烯小球的制备及吸附性能研究[J].青岛大学学报:自然科学版,2013,26(3):38-42.
[18] 周强,段钰锋,冒咏秋,等.活性炭汞吸附动力学及吸附机制研究[J].中国电机工程学报,2013,33(29):10-17.
[19] 李嘉宁,孔庆山,高继贤,等.海藻酸对水溶液中Cu2+的吸附动力学研究[J].科学技术与工程,2010,(4):942-945.
[20] 吴焕领,魏赛男,崔淑玲,吸附等温线的介绍及应用[J].染整技术,2006,28(10):12-27.
[21] 成芳芳,孔庆山,纪全,等.海藻酸纤维对水溶液中Fe3+的吸附动力学研究[J].合成纤维工业,2010(2):1-4.