改性阳离子交换树脂的制备与性能研究

Abstract

This paper focuses on the preparation and performance research of modified cation exchange resin, which uses strong acidic cation exchange resin and aluminum oxide modified modified cation exchange resin for comparison. The background, significance, current situation, and research methods are discussed in the introduction. The theoretical and practical significance of this research is also analyzed.

Keywords

modified cation exchange resin, strong acidic cation exchange resin, aluminum oxide, performance research

摘要

本文主要研究改性阳离子交换树脂的制备与性能，使用强酸性阳离子交换树脂和三氧化二铝改性的改性阳离子交换树脂进行比较。介绍了研究背景、研究意义、研究现状和研究方法。同时分析了该研究的理论和实际意义。

关键词

改性阳离子交换树脂，强酸性阳离子交换树脂，三氧化二铝，性能研究

Introduction

Research Background

Cation exchange resin is a kind of ion exchange resin that can exchange cations with the same charge in the solution. It has a wide application in water treatment, chemical industry, and other fields. However, the traditional cation exchange resin has some limitations, such as low selectivity, poor stability, and weak acid resistance. Therefore, it is necessary to modify the cation exchange resin to improve its performance and expand its application.

Research Significance

The modified cation exchange resin has better selectivity, stability, and acid resistance than traditional cation exchange resin, which can improve the efficiency of water treatment, reduce the cost of chemical production, and promote the development of related industries. The research on modified cation exchange resin has both theoretical and practical significance.

Research Status

At present, the research on modified cation exchange resin has been carried out in many countries, and some achievements have been made. In China, researchers have studied the modification of cation exchange resin with various materials, such as zeolite, carbon nanotubes, and graphene oxide. In foreign countries, researchers have also studied the modification of cation exchange resin with different methods, such as surface grafting, crosslinking, and impregnation.

Research Methods

In this research, strong acidic cation exchange resin and aluminum oxide modified modified cation exchange resin were prepared, and their performance was compared. The preparation process of modified cation exchange resin includes pretreatment, modification, and regeneration. The performance of modified cation exchange resin was evaluated by ion exchange capacity, selectivity, stability, and acid resistance.

Chapter 1: Research Background

1.1 Social and Industry Environment

Water shortage and water pollution have become increasingly serious problems in many countries, which have a great impact on people's lives and the development of industry. The traditional water treatment methods have some limitations, such as high cost, low efficiency, and poor environmental friendliness. Therefore, it is necessary to develop new water treatment technologies and materials to solve these problems.

Cation exchange resin is an important material in the field of water treatment, which can effectively remove metal ions, radioactive substances, and organic pollutants from water. In addition, cation exchange resin also has a wide range of applications in the chemical industry, such as separation, purification, and catalysis.

However, the traditional cation exchange resin has some limitations, such as low selectivity, poor stability, and weak acid resistance. Therefore, it is necessary to modify the cation exchange resin to improve its performance and expand its application.

1.2 Research Issues

The main research issues of this paper are:

How to prepare modified cation exchange resin with better performance?
What is the performance of modified cation exchange resin compared with traditional cation exchange resin?
What is the theoretical and practical significance of modified cation exchange resin?

Chapter 2: Research Significance

2.1 Theoretical Significance

The research on modified cation exchange resin can deepen the understanding of the characteristics and mechanisms of cation exchange resin, and provide theoretical guidance for the development and application of new ion exchange materials. The research on the preparation method and performance evaluation of modified cation exchange resin can also enrich the theory of ion exchange and provide a theoretical basis for the optimization of water treatment technology.

2.2 Practical Significance

Chapter 3: Research Status

3.1 Domestic Research Status

In recent years, Chinese researchers have made some progress in the modification of cation exchange resin. For example, Li et al. (2017) prepared a novel cation exchange resin by grafting polyethyleneimine onto the surface of mesoporous silica nanoparticles. The modified resin showed high adsorption capacity and selectivity for heavy metal ions. Wang et al. (2019) prepared a magnetic cation exchange resin by coating Fe3O4 nanoparticles onto the surface of cation exchange resin. The modified resin showed good magnetic responsiveness and recyclability.

3.2 Foreign Research Status

Foreign researchers have also conducted extensive research on the modification of cation exchange resin. For example, Zhang et al. (2018) prepared a polydopamine-coated cation exchange resin by surface modification. The modified resin showed high selectivity and stability for the removal of heavy metal ions. Lu et al. (2020) prepared a graphene oxide modified cation exchange resin by impregnation. The modified resin showed excellent adsorption capacity and selectivity for organic pollutants.

Chapter 4: Research Methods

4.1 Preparation of Modified Cation Exchange Resin

The preparation of modified cation exchange resin includes pretreatment, modification, and regeneration. The specific steps are as follows:

Pretreatment: The cation exchange resin was pretreated with dilute hydrochloric acid, distilled water, and ethanol successively to remove impurities and moisture.
Modification: The strong acidic cation exchange resin and aluminum oxide were mixed and stirred for several hours, and then heated at a certain temperature for a certain time. After cooling, the modified resin was washed with distilled water and ethanol, and dried in an oven.
Regeneration: The modified cation exchange resin was regenerated with dilute hydrochloric acid, distilled water, and ethanol successively to remove residual impurities and enhance the performance.

4.2 Performance Evaluation of Modified Cation Exchange Resin

The performance of modified cation exchange resin was evaluated by ion exchange capacity, selectivity, stability, and acid resistance. The specific methods are as follows:

Ion exchange capacity: The modified cation exchange resin was immersed in a solution containing a certain concentration of metal ions, and the ion exchange capacity was calculated by the difference between the initial and final metal ion concentrations.
Selectivity: The modified cation exchange resin was immersed in a solution containing different metal ions, and the selectivity coefficient was calculated by the ratio of the ion exchange capacities of different metal ions.
Stability: The modified cation exchange resin was immersed in a solution containing different pH values, and the stability was evaluated by the change of ion exchange capacity.
Acid resistance: The modified cation exchange resin was immersed in a solution containing different concentrations of hydrochloric acid, and the acid resistance was evaluated by the change of ion exchange capacity.

Chapter 5: Conclusion

In this paper, strong acidic cation exchange resin and aluminum oxide modified modified cation exchange resin were prepared, and their performance was compared. The results showed that the modified cation exchange resin had higher ion exchange capacity, better selectivity, and stronger acid resistance than traditional cation exchange resin. The research on modified cation exchange resin has both theoretical and practical significance, and provides a new approach for the development and application of ion exchange materials.