Polyphosphonate covalent organic frameworks (IMAGE) Heinrich-Heine University Duesseldorf Caption On the basis of phosphonic acid, the research team has developed a stable covalent organic framework, which is capable of capturing carbon dioxide (CO2). (Fig.: HHU/Gündog Yücesan) Credit HHU/Gündog Yücesan Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.