微波辅助含酯基双子表面活性剂改性蒙脱石及其对三氯生的吸附行为。
Microwave-assisted modification on montmorillonite with ester-containing Gemini surfactant and its adsorption behavior for triclosan.
机构信息
State Key Laboratory of Pulp & Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China.
State Key Laboratory of Pulp & Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China; Key Laboratory of Jiangxi Province for Ecological Diagnosis-Remediation and Pollution Control, Nanchang Hangkong University, Nanchang 330063, China.
出版信息
J Colloid Interface Sci. 2014 Mar 15;418:311-6. doi: 10.1016/j.jcis.2013.12.035. Epub 2013 Dec 19.
To obtain effective adsorbent that can remove emerging organic pollutant of triclosan (TCS) in aquatic environment, different ester-containing Gemini surfactant-modified MMT (EMMT) were prepared under microwave irradiation. The whole process was rapid, uniform, easy and energy-efficient. The structures and morphology of EMMT were characterized by XRD, TEM, FT-IR, SEM and TGA. The results revealed that the saturated intercalation amount of this surfactant was 0.8 times to cation exchange capacity (CEC) of MMT, and there was electrostatic interaction between ester-containing Gemini surfactant and MMT. In addition, they bound in the ways of intercalation, intercalation-adsorption or adsorption, which relied on the dosage of the surfactant. The surface of EMMT was hydrophobic, rough and fluffy, which contributed to its strong adsorption capacity. The adsorption equilibrium data of EMMT for TCS were fitted to Langmuir and Freundlich isothermal adsorption model. The result showed that Langmuir isothermal adsorption model could describe the adsorption behavior better, the adsorption behavior of TCS on EMMT was confirmed to a surface monolayer adsorption, and notably the theoretical maximum adsorption capacity was up to 133 mg/g. Therefore, this work lays important foundation on developing effective and safe absorbent materials for the treatment of emerging organic pollutants.
为了获得能够有效去除水环境中新兴有机污染物三氯生（TCS）的吸附剂，采用微波辐射法制备了不同酯基双子表面活性剂改性蒙脱土（EMMT）。整个过程快速、均匀、简便且节能。采用 XRD、TEM、FT-IR、SEM 和 TGA 对 EMMT 的结构和形貌进行了表征。结果表明，该表面活性剂的饱和插层量为蒙脱土阳离子交换容量（CEC）的 0.8 倍，酯基双子表面活性剂与蒙脱土之间存在静电相互作用。此外，它们通过插层、插层-吸附或吸附的方式结合，这取决于表面活性剂的用量。EMMT 的表面是疏水性的、粗糙的和蓬松的，这有助于其具有较强的吸附能力。EMMT 对 TCS 的吸附平衡数据分别拟合了 Langmuir 和 Freundlich 等温吸附模型。结果表明，Langmuir 等温吸附模型能更好地描述吸附行为，TCS 在 EMMT 上的吸附行为被证实为单层表面吸附，且理论最大吸附容量高达 133mg/g。因此，这项工作为开发处理新兴有机污染物的有效和安全的吸附材料奠定了重要基础。
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