1、Adsorption properties of macroporous exchangers functionalized with

In this work, six macroporous weak-base anion exchange resins were synthesized, and the adsorption characteristics of the resins for three typical aromatic acids including benzenesulfonic acid (BSA), benzoic acid (BA), phenol (PH) were investigated.

2、Synthesis, adsorption and molecular simulation study of methylamine

In the present work, six kinds of the hyper-cross-linked resins were synthesized from the commercial available macroporous cross-linked chloromethylated polystyrene resins by regulating the...

3、Preparation of a Dual

A macroporous dual-functional acid–base covalent organic polymer catalyst poly (St-VBC)-NH2-SO3H was prepared using high internal phase emulsion polymerization using vinylbenzyl chloride (VBC), styrene (St), and divinylbenzene (DVB) as substrates ...

Research progress of modified macroporous adsorption resin in

modification of macroporous adsorption resin is an ideal way to improve its separation efficiency and selectivity. In this paper, recent advances in the preparation of modified macroporous adsorption r

Preparation of a Dual

The catalytic activity of the poly (St-VBC)-NH2-SO3H series with different acid/base densities was assessed for one-pot cascade C–C bond-forming reactions involving deacetylation–Henry reactions. The poly (St-VBC)-NH2-SO3H (20) sample bearing 1.82 mmol/g of N (base site) and 1.16 mmol/g (acid site) showed the best catalytic activity.

Research progress of modified macroporous adsorption resin in

The functional modification of macroporous adsorption resin is an ideal way to improve its separation efficiency and selectivity.

Fabrication of weakly basic

In the process of suspension polymerization, different feed ratios of divinylbenzene (DVB) and maleic anhydride (MAH) generated macroporous interpenetrating network resins (DMH) with different pore structures.

Macroporous polymeric resins as a tool to obtain bioactive compounds in

One of the most used techniques for these processes is through the application of macroporous polymeric resins (MPRs). MPRs have high adsorption and desorption capacities for substances such as polyphenols and sugars that are present in extracts and industrial effluents.

Studies on Adsorption Kinetics and Thermodynamics of Macroporous Resin

The RosA was purified using NK-109 macroporous resin and its adsorption kinetics, isotherms and thermodynamics were determined. The adsorption kinetics showed that the adsorption behavior of RosA in NK-109 resin conformed to the pseudo-second-order kinetic model.

Preparation of a Dual

Preparation of a Dual-Functionalized Acid–Base Macroporous Polymer via High Internal Phase Emulsion Templating as a Reusable Catalyst for One-Pot Deacetalization–Henry Reaction - PMC

In modern materials science and chemical engineering, macroporous resins, as a class of adsorbents with unique properties, are widely utilized in various industrial processes due to their excellent separation and purification capabilities. traditional macroporous resins often exhibit poor selectivity when handling specific acidic or basic substances, limiting their potential applications in fine chemical industries. To overcome this limitation, surface treatment of macroporous resins through acid-base modification technology has become a critical approach to enhancing their selectivity and efficiency. This article aims to explore the principles, processes, and practical significance of acid-base modification of macroporous resins.

Basic Characteristics of Macroporous Resins

Macroporous resins are porous polymeric compounds with numerous micropores inside, which can effectively adsorb molecules of various sizes. Due to their high specific surface area and robust mechanical strength, macroporous resins have become indispensable materials in many industrial applications. their limited adsorption capacity for acidic or basic substances is a major factor restricting their broader use in specific scenarios.

Necessity of Acid-Base Modification

In chemical production, processes such as acid elution and alkaline elution often require the separation or purification of acidic or basic substances. Traditional macroporous resins frequently fail to achieve ideal results in these processes due to their weak adsorption capacity for acidic or basic substances. acid-base modification can significantly enhance the adsorption capacity of macroporous resins for these substances, thereby expanding their application scope in fine chemical industries.

Principles of Acid-Base Modification

Acid-base modification is primarily achieved through two approaches: (1) introducing specific acid-base groups during resin synthesis and (2) forming an acid-base coating layer on the resin surface. Both methods can enhance the affinity of macroporous resins for specific acidic or basic substances.

1. Introduction of Acid-Base Groups: Acidic or basic monomers can be incorporated into the synthesis of macroporous resins through copolymerization or grafting. These acid-base groups can react chemically with target substances, improving adsorption capacity. For example, introducing sulfonate or phosphate groups can enhance the resin’s adsorption capacity for acidic substances.

2. Surface Acid-Base Coating: An acid-base coating layer is formed on the resin surface through chemical reactions. This process typically involves active sites such as hydroxyl or carboxyl groups on the resin surface, where acid-base ions or functional groups are introduced via acid-base reactions to improve adsorption specificity.

Processes of Acid-Base Modification

The modification process consists of three main steps: resin pretreatment, introduction of acid-base groups, and formation of the surface acid-base coating.

1. Pretreatment: Macropore resins are first pretreated to remove impurities and increase surface activity, ensuring the success of subsequent modifications.

2. Introduction of Acid-Base Groups: Suitable acid-base groups are selected based on desired properties and introduced through chemical reactions such as copolymerization or grafting.

3. Formation of Surface Coating: A layer of acid-base coating is applied to the resin surface using appropriate methods to enhance adsorption capacity for specific substances.

Practical Applications of Acid-Base Modification

Acid-base-modified macroporous resins have been successfully applied in multiple fields. For example, in wastewater treatment, they efficiently remove acidic or basic pollutants. In pharmaceutical separation, modified resins improve drug purity and recovery rates.

Acid-base modification of macroporous resins significantly enhances their adsorption capacity for specific acidic or basic substances and expands their applications in fine chemical industries. This modification technique effectively addresses the limitations of traditional macroporous resins in specialized scenarios. With ongoing technological advancements and growing application demands, acid-base-modified macroporous resins are expected to demonstrate greater potential and value in more fields.