# Expression of concern: Highly porous copper-supported magnetic nanocatalysts: made of volcanic pumice textured by cellulose and applied for the reduction of nitrobenzene derivatives

## TL;DR

The paper expresses concern about a study on a copper-based nanocatalyst made from volcanic pumice and cellulose for reducing nitrobenzene compounds.

## Contribution

The paper raises concerns about the validity or reliability of the original study's findings.

## Key findings

- The paper questions the accuracy or reproducibility of the original research.
- It highlights potential issues with the experimental methods or data interpretation.

## Abstract

Expression of concern for ‘Highly porous copper-supported magnetic nanocatalysts: made of volcanic pumice textured by cellulose and applied for the reduction of nitrobenzene derivatives’ by Reza Taheri-Ledari et al., RSC Adv., 2021, 11, 25284–25295, https://doi.org/10.1039/D1RA03538J.