# Carbon-Supported Hyperbranched Polyethyleneimines: Exploring into Polyamine/Anion Interactions to Design Efficient Polymer-Based Energy and Scavenger Materials

## TL;DR

This paper explores how a hybrid material made of polyethyleneimine on carbon can efficiently capture harmful anions, offering insights for designing better energy and scavenger materials.

## Contribution

The study introduces a novel method to predict polyamine/anion interactions using a hybrid material for efficient anion scavenging.

## Key findings

- The AC-HBPEI hybrid material effectively scavenges CrO42−, PO43−, AsO43−, and HgCl42− anions.
- Anion adsorption is determined by the complexing properties of HBPEI molecules.
- The study provides a tool to design efficient polymer-based materials for energy and scavenging applications.

## Abstract

The anion-complexation mechanism and anion-adsorption capacity of a hybrid material based on hyperbranched polyethyleneimine (HBPEI) covalently bonded onto an activated carbon (AC) is presented. The anion-scavenger behavior of this hybrid material toward CrO42−, PO43−, AsO43− and HgCl42− was explored by direct potentiometric and adsorption measurements, which revealed a novel approach to predict the interactions between the supported polymeric complexing units and the different anions. The results were analyzed by considering the reactivity data of the HBPEI/anion (HBPEI free in solution) and AC-HBPEI/anion systems. The results corroborated that the AC-HBPEI hybrid material is an excellent anion-complexing material, whose anion adsorption ability is defined by the complexing properties of the HBPEI molecules toward the anions. This assessment provides a straightforward tool to determine the type and strength of the interactions involved in supported polymer-based/anion systems, which can provide valuable information for predicting and designing efficient energy and scavenger materials.