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摘要
通过浸渍法分别用丙烯酸(AA)和纳米二氧化硅(SiO2)改性壳聚糖(CTS),制备AA/SiO2/CTS复合材料。通过红外光谱表征了复合材料的结构,并以复合材料为吸附剂吸附铬离子,研究了复合材料吸附铬离子的吸附性能。结果表明:当吸附剂用量为2.0g,pH为6左右,铬离子浓度为20mg/L,温度为25℃,吸附70min时,吸附效果最好,改性后的复合吸附剂AA/SiO2/CTS的吸附率最高可达96%,明显高于未改性CTS的85%和AA/CTS的92%。吸附热力学和动力学研究表明,Freundlich等温模型和拟二级动力学模型更加符合吸附过程。
Abstract
Chitosan (CTS) was modified with acrylic acid (AA) and nano silica (SiO2) by impregnation to prepare AA/SiO2/CTS composite.The structure of the composite was characterized by infrared spectroscopy,and its adsorption performance for chromium ion was studied by using the composite material as adsorbent.The results showed that the adsorption effect was the best when the dosage of adsorbent was 2.0g,the pH value was about 6,the concentration of chromium ion was 20mg/L,the temperature was 25℃,and the adsorption time was 70min.The adsorption rate of modified composite adsorbent AA/SiO2/CTS could reach 96%,which was significantly higher than 85% of unmodified CTS and 92% of AA/CTS.The adsorption thermodynamics and kinetics studies revealed that Freundlich isothermal model and pseudo second-order kinetic model were more consistent with the adsorption process.
关键词
二氧化硅
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丙烯酸
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壳聚糖
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吸附
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动力学
Key words
silica
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acrylic acid
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chitosan
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adsorption
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dynamics
AA/SiO2/CTS复合材料制备及其吸附铬离子研究[J].
化工新型材料, 2023, 51(4): 243-246 DOI:10.19817/j.cnki.issn1006-3536.2023.04.043
[1] 房春生,王殿升,推玥,等.电镀废水深度处理工艺设计及案例[J].吉林大学学报(地球科学版),2020,50(3):1-11.
[2] 李乃玮,陈月琴,罗维,等.壳聚糖/生物碳符合材料对Gr离子的吸附性能[J].应用化工,2022,51(2):406-410.
[3] 钱敏杰,刘杰,吴占超,等.多乙烯多胺改性磁性壳聚糖复合材料制备及其对Cu2+的吸附性能[J].青岛科技大学学报(自然科学版),2022,43(1):14-20.
[4] 黄承都,艾硕,刘纯又,等.壳聚糖/活性白土糖用复合脱色剂的制备及其吸附特性研究[J].食品工业科技,2022,43(8):76-84.
[5] 潘媛媛,李巧玲,李凯旋,等.柠檬酸改性磁性壳聚糖的制备及对亚甲基蓝的吸附性能研究[J].化工新型材料,2013,41(10):82-85.
[6] 周丽莎,李若男,卞雨洁,等.TOCNF与磁性羧甲基壳聚糖纳米粒子复合物的制备及吸附Pb2+的特性[J].化工进展,2022,41(2):901-910.
基金资助
湖北省科研项目(B2019258和2018475)
