银基负载的氧化石墨烯磁性纳米复合材料的合成、表征及其对2,4-二氯酚的吸附

引用本文: 陈素清, 沈茂, 梁华定, 鲍明辉. 银基负载的氧化石墨烯磁性纳米复合材料的合成、表征及其对2,4-二氯酚的吸附[J]. 分析化学, 2020, 48(7): 912-920. doi: 10.19756/j.issn.0253-3820.191723 shu

Citation: CHEN Su-Qing, SHEN Mao, LIANG Hua-Ding, BAO Ming-Hui. Synthesis and Characterization of Magnetic Graphene Oxide Nanocomposites Supported Silver Matrix and Its Adsorption Property for 2,4-Dichlorophenol[J]. Chinese Journal of Analytical Chemistry, 2020, 48(7): 912-920. doi: 10.19756/j.issn.0253-3820.191723 shu

银基负载的氧化石墨烯磁性纳米复合材料的合成、表征及其对2,4-二氯酚的吸附

台州学院医药化工与材料工程学院, 台州 318000
基金项目:
本文系浙江省自然科学基金项目（No.LTY20B050001）和浙江省公益技术研究计划项目（No.LGC19B050006）资助

摘要: 以溶剂热法制备得到磁性Ag/AgCl@Fe₃O₄@GO纳米复合材料，利用透射电镜（TEM）、扫描电镜（SEM）、X射线能谱（EDX）和N₂吸附-脱附对样品的结构和形貌进行测试表征，研究了材料对水溶液中2，4-二氯酚（2，4-DCP）的吸附性能。此纳米复合材料由具有介孔结构的球形磁性纳米颗粒Ag/AgCl@Fe₃O₄负载在一层带褶皱的氧化石墨烯表面制备而成，平均孔径S_p为13.98 nm，比表面积为46.91 m²/g，孔体积为0.1791 cm³/g。Ag/AgCl@Fe₃O₄@GO复合材料对2，4-DCP的吸附实验表明，对于20 mg/L 2，4-DCP溶液，20 min基本达到吸附平衡，吸附量为13.74 mg/g；吸附以拟二级动力学模型为主导，相关系数为0.9995；吸附符合Langmuir模型，相关系数为0.9841~0.9972，为单分子层吸附；吸附热力学参数ΔG分别为-5.0462 kJ/mol（293 K）、-4.4076 kJ/mol（303 K）、-3.7522 kJ/mol（313 K）、-3.4358 kJ/mol（323 K），ΔH为-17.1653 kJ/mol，ΔS为-42.2158 J/（mol·K）。吸附过程为放热熵减小的自发过程，温度越低，越利于吸附，具有物理吸附特征。此复合材料具有较好的吸附活性，还可通过外加磁场的方式实现回收再利用。

关键词:

English

Synthesis and Characterization of Magnetic Graphene Oxide Nanocomposites Supported Silver Matrix and Its Adsorption Property for 2,4-Dichlorophenol

School of Pharmaceutical and Materials Engineering, Taizhou University, Taizhou 318000, China
Received Date: 06 December 2019
Revised Date: 21 April 2020
Fund Project:
This work was supported by the Zhejiang Provincial Natural Science Foundation (No. LTY20B050001) and the Zhejiang Provincial Public Welfare Technology Research Project, China (No. LGC19B050006).

Abstract: Magnetic nanocomposites Ag/AgCl@Fe₃O₄@GO were synthesized by solvothermal process. The structure and morphology of the products were characterized by transmission electron microscopy, scanning transmission electron microscopy, energy dispersive X-ray spectroscopy and nitrogen adsorption and desorption method. The adsorption properties of the materials for 2,4-dichlorophenol (2,4-DCP) in aqueous solution were studied. The results indicated that the nanocomposites were composed of Ag/AgCl@Fe₃O₄ spherical magnetic nanoparticles with mesoporous structure loaded on the folded surface of graphene oxide. The average pore size of the product was 13.98 nm, and the specific surface area and pore volume were 46.91 m²/g and 0.1791 cm³/g, respectively. The adsorption experiment of 2,4-DCP on Ag/AgCl@Fe₃O₄@GO composite showed that for 20 mg/L of 2,4-DCP solution, the adsorption equilibrium was basically reached in 20 min, and the adsorption capacity was 13.74 mg/g. The adsorption fitted well with pseudo second-order kinetic model, and the correlation coefficient was 0.99954. The Langmuir model was more suitable for describing the adsorption with the correlation coefficient range of 0.9841-0.9972, which showed that the adsorption was a monolayer adsorption. Adsorption thermodynamic parameters ΔG were -5.0462 kJ/mol (293 K), -4.4076 kJ/mol (303 K), -3.7522 kJ/mol (313 K), -3.4358 kJ/mol (323 K), ΔH and ΔS were -17.1653 kJ/mol and -42.2158 J/(mol·K), respectively. The adsorption process was a spontaneous exothermic process with entropy decreasing. In addition, the temperature was lower and the adsorption was better, which showed the characteristics of physical adsorption. This kind of functional composite not only had good adsorption activity, but also could be recycled by the way of external magnetic field.

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

银基负载的氧化石墨烯磁性纳米复合材料的合成、表征及其对2,4-二氯酚的吸附

English

Synthesis and Characterization of Magnetic Graphene Oxide Nanocomposites Supported Silver Matrix and Its Adsorption Property for 2,4-Dichlorophenol

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

银基负载的氧化石墨烯磁性纳米复合材料的合成、表征及其对2,4-二氯酚的吸附

English

Synthesis and Characterization of Magnetic Graphene Oxide Nanocomposites Supported Silver Matrix and Its Adsorption Property for 2,4-Dichlorophenol

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs