Citation: YANG Yun-Han, YANG Jun-Li, LU Jia-Jia, LI Can-Hua, GU Jie, CHEN Wen, YANG Li-Juan. Preparation of Cationic Water-Pillar[5]arene Modified Zeolite and Its Adsorption to Bromocresol Purple[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(12): 1922-1930. doi: 10.19756/j.issn.0253-3820.191290 shu

Preparation of Cationic Water-Pillar[5]arene Modified Zeolite and Its Adsorption to Bromocresol Purple

YANG Yun-Han ^1, ,
YANG Jun-Li ¹ ,
LU Jia-Jia ¹ ,
LI Can-Hua ¹ ,
GU Jie ¹ ,
CHEN Wen ² ,
YANG Li-Juan ¹

1.
Key Laboratory of Intelligent Supramolecular Chemistry at the University of Yunnan Province, National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials, School of Chemistry&Environment, Yunnan Minzu University, Kunming 650500, China;
2.
Key Laboratory of Medicinal Chemistry for Natural Resources, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China

Received Date: 16 May 2019
Revised Date: 10 October 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 21562048, 21762051), the Program for Innovative Research Team (in science and technology) in University of Yunnan Province and Yunnan Provincial Department of Education Science Research Fund Project (No. 2019Y0193).

The cationic water-pillar[5]arene (CP5A) modified zeolite (NZ) was prepared for adsorption of anionic dye bromocresol purple (BCP). The CP5A/NZ was characterized by scanning electron microscopy (SEM), infrared absorption spectroscopy (IR) and X-ray powder diffraction (XRD). The effects of NZ particle size, concentration of CP5A during modification, adsorption time, initial BCP concentration and solution pH on the removal percentage of BCP were studied. In addition, the kinetics and adsorption isotherms of BCP adsorption by CP5A/NZ were also analyzed, and the adsorption mechanism was discussed. SEM showed that the scaly structure of the NZ disappeared after CP5A modification, showing an enlarged bulk structure. The vibration of CH₃N⁺ and CH₂N⁺ in CP5A appeared in the CP5A/NZ. XRD revealed that the zeolite had different crystal structure after CP5A modification, and all of the above phenomena indicated that CP5A was successfully loaded into the NZ. Adsorption studies showed that due to charge repulsion, NZ had no scavenging ability to BCP. However, when CP5A solution (10 g/L) was used to modify NZ in the range of 0.42-0.59 nm, the removal percentage of BCP was 93.98%, and the adsorption reached equilibrium in 300 min. CP5A/NZ had a high removal percentage when treated with low concentrations (< 100 mg/L) of BCP solution. The second-order kinetic equation and the Langmuir isotherm could better fit the adsorption process of CP5A/NZ to BCP. The adsorption mechanism of CP5A/NZ on BCP could be described as follows:after the cation exchange of CH₂N⁺ with NZ in CP5A, CH₂N⁺ bound to the negative potential point on the surface of NZ, which increased the positive charge activity adsorption site of NZ surface, and thus the anion dye BCP had good scavenging ability.
- Zeolite,
- Cationic water-pillar[5]arene,
- Bromocresol purple,
- Modification,
- Adsorption
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