袁琦,王玉珑,韩俊源,魏鑫鑫,戴洋,刘艳新.羧甲基纤维素钠/己二酸二酰肼水凝胶的制备及其重金属离子吸附性能研究[J].中国造纸学报,2021,36(4):38-47 |
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羧甲基纤维素钠/己二酸二酰肼水凝胶的制备及其重金属离子吸附性能研究 |
Study on Preparation of Sodium Carboxymethyl Cellulose/Adipic Dihydrazide Hydrogel and Its Adsorption Performance for Heavy Metal Ions |
投稿时间:2020-12-28 |
DOI:10.11981/j.issn.1000-6842.2021.04.38 |
中文关键词: 羧甲基纤维素钠(CMC) 己二酸二酰肼(ADH) 水凝胶 重金属离子 废水 |
Key Words:sodium carboxymethyl cellulose (CMC) adipic dihydrazide (ADH) hydrogel heavy metal ions wastewater |
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中文摘要: |
以羧甲基纤维素钠(CMC)为基材、己二酸二酰肼(ADH)为交联剂,成功制备了具有三维网络结构的CMC/ADH水凝胶,研究了CMC/ADH水凝胶对废水中重金属离子(Cr6+、Cu2+、Pb2+)的吸附性能。采用傅里叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)、X射线能谱分析(EDS)和溶胀性能分析等方法对CMC/ADH水凝胶进行表征;研究了吸附时间、pH值及重金属离子初始浓度对CMC/ADH水凝胶在模拟废水中吸附行为的影响;并对CMC/ADH水凝胶的吸附机理进行分析研究。结果表明,在室温(25℃)、pH值=3、重金属离子初始浓度50 mg/L、吸附时间300 min的条件下,CMC/ADH水凝胶对废水中Cr6+、Cu2+和Pb2+的吸附量分别为31.5、75.9和72.0 mg/g;其吸附过程的动力学模型和等温模型的拟合结果表明,CMC/ADH水凝胶吸附重金属离子的过程是单层化学吸附过程。 |
Abstract: |
The sodium carboxymethyl cellulose/adipic dihydrazide (CMC/ADH) hydrogel with three-dimensional network structure was successfully prepared by using CMC as the substrate and ADH as the cross-linking agent. The adsorption performance of the CMC/ADH hydrogel on heavy metal ions (Cr6+, Cu2+, and Pb2+) in wastewater was studied. The as-prepared hydrogel was characterized through Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), X-ray energy spectrum analysis (EDS), and swelling performance analysis. The effects of adsorption time, pH value, and initial concentration of heavy metal ion on the adsorption process of CMC/ADH hydrogel in simulated wastewater, and the mechanism of which were studied. The results showed that the adsorption capacities of CMC/ADH hydrogel for Cr6+, Cu2+, and Pb2+ were 31.5, 75.9, and 72.0 mg/g, respectively, at room temperature (25℃), pH value of 3, initial concentration of heavy metal ion of 50 mg/L, and adsorption time of 300 min. The kinetic model and isothermal model fitting results of the adsorption process showed that adsorption of CMC/ADH hydrogel on heavy metal ions was a monolayer chemical process. |
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