In 2022,Tang, Jiali; Chen, Yingbi; Wang, Shixing; Kong, Desong; Zhang, Libo published an article in Environmental Research. The title of the article was 《Highly efficient metal-organic frameworks adsorbent for Pd(II) and Au(III) recovery from solutions: Experiment and mechanism》.Name: 2,6-Diaminopyridine The author mentioned the following in the article:
With the boom of modern industry, the demand for precious metals palladium (Pd) and gold (Au) is increasing. However, the discharge of Pd(II) and Au(III) wastewater has caused environmental pollution and shortage of resources. Here, a new metal-organic frameworks adsorbent (MOF-AFH) was synthesized to efficiently sep. Pd(II) and Au(III) from the water. The adsorption behavior of Pd(II) and Au(III) was explored at the same time. When gold and palladium are adsorbed sep., the adsorption capacity of gold and palladium is 389.02 mg/g and 191.27 mg/g, resp. The equilibration time is 3 h. When gold and palladium coexist, the adsorption capacities of Au(III) and Pd(II) are 238.71 and 115.02 mg/g, resp. The exptl. results show that the adsorption of Pd(II) and Au(III) on MOF-AFH is a single-layer chem. adsorption, which is an endothermic process. MOF-AFH has excellent selectivity and after MOF-AFH is repeatedly used 4 times, the removal effect can still reach more than 90%. The adsorption mechanisms include reduction reaction and chelation with N and O-containing functional groups on the adsorbent. There is also electrostatic interaction for Au(III) adsorption. The adsorbent can be used to efficiently recover gold and palladium from wastewater. In the experimental materials used by the author, we found 2,6-Diaminopyridine(cas: 141-86-6Name: 2,6-Diaminopyridine)
2,6-Diaminopyridine(cas: 141-86-6) belongs to pyridine. Pyridine and its simple derivatives are stable and relatively unreactive liquids, with strong penetrating odours that are unpleasant.Name: 2,6-Diaminopyridine