| 功能化枝状复合吸附材料的制备及吸附Cr(Ⅵ)的性能 |
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| 引用本文： | 史航,李兵,郭建忠.功能化枝状复合吸附材料的制备及吸附Cr(Ⅵ)的性能[J].浙江农林大学学报,2022,39(2):396-404. |
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| 作者姓名： | 史航 李兵 郭建忠 |
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| 作者单位： | 1.浙江农林大学 化学与材料工程学院，浙江 杭州 3113002.浙江农林大学 浙江省林业生物质化学利用重点实验室，浙江 杭州 311300 |
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| 基金项目： | 国家自然科学基金资助项目( 21677132) |
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| 摘 要： | 目的 针对介孔分子筛的化学改性合成枝状复合吸附材料，研究其吸附性能对重金属废水治理具有现实意义。 方法 以介孔材料SBA-15为硅源，通过化学修饰方法合成树枝状化合物的复合吸附材料SBA-15-G3，并用巯基耦合剂巯基乙酸在 SBA-15-G3上嫁接巯基，成功合成功能化吸附材料SBA-15-G3-SH。通过场发射扫描电子显微镜、能量色散X-射线光谱、傅里叶变换红外光谱、X射线衍射、Zeta电位分析和氮气吸附-脱附等温线等方法对材料的结构和物理化学性质进行了表征。通过SBA-15-G3-SH对水溶液中铬离子Cr(Ⅵ)]的吸附，研究了pH、时间、初始铬离子浓度、温度等对吸附性能的影响。分析SBA-15-G3-SH吸附剂的吸附等温线、动力学和热力学特性，采用Langmuir和Freundlich吸附等温线模型对数据进行分析。 结果 Langmuir吸附等温线模型较好地拟合了吸附过程，吸附动力学模型符合准二级动力学方程。 结论 吸附主要通过SBA-15-G3-SH表面的—SH基团表面络合作用以及与重金属离子的静电吸引，导致形成稳定的化合物。热力学结果表明:吸附Cr(Ⅵ)是一个自发的放热过程。图10表3参21
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| 关 键 词： | 枝状吸附材料 巯基 铬离子 吸附 重金属 |
| 收稿时间： | 2021-01-07 |
Preparation of functional dendritic composite adsorbents and their adsorption properties for Cr(Ⅵ) |
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| SHI Hang,LI Bing,GUO Jianzhong.Preparation of functional dendritic composite adsorbents and their adsorption properties for Cr(Ⅵ)[J].Journal of Zhejiang A&F University,2022,39(2):396-404. |
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| Authors: | SHI Hang LI Bing GUO Jianzhong |
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| Affiliation: | 1.College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou 311300, Zhejiang, China2.Zhejiang Provincial Key Laboratory of Chemical Utilization of Forestry Biomass, Zhejiang A&F University, Hangzhou 311300, Zhejiang, China |
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| Abstract: | Objective The objective is to study the adsorption property of dendritic composite adsorbent synthesized by chemical modification of mesoporous molecular sieve for the treatment of heavy metal wastewater. Method The composite adsorbent SBA-15-G3 of dendritic compounds was synthesized by chemical modification with mesoporous material SBA-15 as silicon source, and the functional adsorbent SBA-15-G3-SH was successfully synthesized by grafting sulfhydryl onto SBA-15-G3 with thioglycolic acid as coupling agent. The structure and physicochemical properties of the materials were characterized by field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), Fourier-transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), Zeta potential analysis, and nitrogen adsorption-desorption isotherms (BET). The effects of pH, time, initial Cr(Ⅵ) concentration, and temperature on the adsorption properties were studied through the adsorption of Cr(Ⅵ) in aqueous solution by SBA-15-G3-SH. The adsorption isotherms, kinetics and thermodynamic characteristics of SBA-15-G3-SH adsorbent were analyzed. Langmuir and Freundlich adsorption isotherm models were used to analyze the experimental data. Result The Langmuir adsorption isotherm model fitted the adsorption process well, and the adsorption kinetic model accorded with the pseudo second-order kinetic equation. Conclusion The adsorption mainly results in the formation of stable compounds through the surface complexation of —SH group on the surface of SBA-15-G3-SH and the electrostatic attraction of heavy metal ions. The thermodynamic results show that Cr(Ⅵ) adsorption onto SBA-15-G3-SH is a spontaneous exothermic process. The high adsorption performance indicates that the SBA-15-G3-SH is an efficient adsorbent to eliminate Cr(Ⅵ) from wastewater. Ch, 10 fig. 3 tab. 21 ref. ] |
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