Peptide-based surface modified silica particles: adsorption materials for dye-loaded wastewater treatment
Peptide-based surface modified silica particles: adsorption materials for dye-loaded wastewater treatment
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DOI：
10.1039/c3ra43871f
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发表时间：
2013-10
期刊：
影响因子：
3.9
通讯作者：
S. Ray;M. Takafuji;H. Ihara
中科院分区：
文献类型：
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作者：
S. Ray;M. Takafuji;H. Ihara
采用固相接枝法制备了表面改性二氧化硅微粒，并对其在废水处理中的应用前景进行了评价。设计的颗粒的结构-活性关系的二氧化硅表面接枝各种氨基酸为基础的肽分子，以确定这些表面改性的二氧化硅颗粒的吸附能力的化学性质的影响进行了研究。红外吸收和固态13 C NMR数据的基础上，以及热重和元素分析，证实了在改性的二氧化硅表面的有机相的成功接枝。有机改性后的SiO2颗粒对水溶液中的有机染料和表面活性剂等阴离子目标物具有良好的吸附性能，吸附行为符合Freundlich或Langmuir吸附等温式，符合准二级动力学。此外，改性二氧化硅的脂肪族外围与表面活性剂的烷基尾的疏水相互作用是表面活性剂在改性二氧化硅上吸附的主要作用力，而π-π和静电相互作用在阴离子染料分子的吸附中起主要作用。
Surface-modified silica particles were prepared via solid-phase grafting methodology, and their prospective utility in wastewater treatment was evaluated. The structure–activity relationship of the designed particles was investigated for silica surfaces grafted with various amino acid-based peptide molecules to determine the effect of the chemical nature on the adsorption capacity of these surface-modified silica particles. The successful grafting of the organic phase over the modified silica surface was confirmed on the basis of infrared absorption and solid-state 13C NMR data, as well as thermogravimetric and elemental analyses. The organically modified silica particles effectively adsorbed anionic targets such as organic dyes and surfactants from aqueous medium, and the adsorption behaviour followed pseudo-second order kinetics, which conformed to the Freundlich or Langmuir adsorption isotherms. Furthermore, hydrophobic interaction of the aliphatic peripherals of the modified silica with the alkyl tail of the surfactant was the major force for adsorption of the surfactants onto the modified silica, whereas π–π and electrostatic interactions played a major role in the adsorption of anionic dye molecules.