金属-海藻酸盐-壳聚糖三元复合材料对甲基橙的控制吸收

Surfaces Pub Date : 2022-09-24 DOI:10.3390/surfaces5040031
B. Steiger, L. Wilson
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引用次数: 4

摘要

合成了三种由硝酸铁、硝酸铝和硝酸铜组成的三元金属复合材料(Fe-TMC-N、Al-TMC-N、Cu-TMC-N),并对其理化性质进行了研究。通过元素分析(XPS)、红外光谱(IR)和热重分析(TGA)对tmc进行了表征。从零电荷点(PZC)估计了tmc的表面电荷,这取决于金属硝酸盐前驱体的类型。金属中心对tmc的吸附性能起着至关重要的作用,其中亚甲基蓝(MB)是一种阳离子染料探针,证实了表面电荷对甲基橙(MO)阴离子染料的有效吸收的影响。Al-TMC-N和Cu-TMC-N对MB的吸收可以忽略不计,而Fe-TMC-N在平衡状态下有适度的MB吸收(26 mg/g)。MO的吸附量采用Langmuir等温线模型,分别为Al-TMC-N (422 mg/g)、Cu-TMC-N (467 mg/g)和Fe-TMC-N (42 mg/g)。动力学吸附曲线符合准二级模型。一般来说,铁在TMC结构中的掺入不太适合去除MO阴离子,而铜或铝基材料比铁基TMC表现出更大(10倍)的MO吸收量。本文的染料吸收结果为控制水中氧阴离子的吸附设计提供了新的见解。
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Ternary Metal-Alginate-Chitosan Composites for Controlled Uptake of Methyl Orange
Three ternary metal composites (TMCs) with iron nitrate, aluminum nitrate, and copper nitrate (Fe-TMC-N, Al-TMC-N, Cu-TMC-N) were synthesized and their physicochemical properties were investigated. Characterization of the TMCs was achieved by elemental analysis (XPS), infrared (IR) spectroscopy and thermogravimetric analysis (TGA). The surface charge of the TMCs was estimated from the point-of-zero-charge (PZC), which depended on the type of metal nitrate precursor. The adsorption properties of the TMCs showed the vital role of the metal center, where methylene blue (MB) is a cationic dye probe that confirmed the effects of surface charge for effective methyl orange (MO) anion dye uptake. MB uptake was negligible for Al-TMC-N and Cu-TMC-N, whereas moderate MB uptake occurs for Fe-TMC-N (26 mg/g) at equilibrium. The adsorption capacity of MO adopted the Langmuir isotherm model, as follows: Al-TMC-N (422 mg/g), Cu-TMC-N (467 mg/g) and Fe-TMC-N (42 mg/g). The kinetic adsorption profiles followed the pseudo-second order model. Generally, iron incorporation within the TMC structure is less suitable for MO anion removal, whereas Cu- or Al-based materials show greater (10-fold) MO uptake over Fe-based TMCs. The dye uptake results herein provide new insight on adsorbent design for controlled adsorption of oxyanion species from water.
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