Functionalization of halloysite sorbent via carboxylic acid linkage for removal methylene blue: Thermodynamics study
کد مقاله : 1361-PHYSCHEM20
1سمیه اکبری *، 2محمد حسن کنعانی جزی، 3محمد حقیقت کیش، 4المیرا پژوتن
1استاد/ دانشگاه صنعتی امیرکبیر
2دانشجوی دانشگاه امیرکبیر
3استاد دانشگاه
4استاد مشاور
چکیده مقاله:
There are lots of research to improve surface functionalization on the halloysite nanotube (HNT). The aim of this work is enhancement of functional group of HNT by dicarboxylic acid groups. HNT first was reacted through silanization reaction via 3-triethoxysilylpropylamine (APTES) to produce HNT-NH2. In the next step, HNT-NH2 was reacted with succinic anhydride in order to create carboxylic acid groups onto the structure. The synthesis process was investigated by FTIR spectra which indicated the addition of carboxylic acid groups to the structure of HNT to increase the adsorption capacity to methylene blue. HNT-HCl (washed HNT using HCl), HNT-NH2 and HNT-COOH adsorbents were compared together. Effect of pH and temperature on removal of methylene blue was investigated. Thermodynamic study indicate adsorption of methylene blue on HNT-COOH was an endothermic and irreversible. The maximum dye removal rate was about 96% at pH 9 at temperature 318 K.
کلیدواژه ها:
halloysite, synthesis, adsorbent, thermodynamic, functional end-group
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