In Situ Formation of Copper Phosphate on Hydroxyapatite for Wastewater Treatment

Abstract

Here, we control the surface activity of hydroxyapatite (HAp) in wastewater treatment which undergoes peroxodisulfate (PDS) activation. Loading the catalytically active Cu species on HAp forms a copper phosphate in the outer layer of HAp. This modification turns a low active HAp into a high catalytically active catalyst in the dye degradation process. The optimal operational conditions were established to be [Cu–THAp]0 = 1 g/L, [RhB]0 = 20 mg/L, [PDS]0 = 7.5 mmol/L, and pH = 3. The experiments indicate that the simultaneous presence of Cu-THAp and PDS synergistically affect the degradation process. Additionally, chemical and structural characterizations proved the stability and effectiveness of Cu-THAp. Therefore, this work introduces a simple approach to water purification through green and sustainable HAp-based materials.

Copper Phosphinate Complexes as Molecular Precursors for Ethanol Dehydrogenation Catalysts

“…Applying molecular precursors to prepare structure-controlled catalysts with homogeneously dispersed catalytic species on the support is a well-known and widely used method. − However, there is a lack of information on applying phosphorus-containing metal complexes (phosphates, phosphonates, and phosphinates) as precursors to nonoxidative ethanol dehydrogenation catalysts. Numerous studies have been conducted on copper phosphates − and phosphonates. − However, the application of phosphinate ligands for the formation of copper complexes has seen limited exploration, with a modest number of copper complexes based on phosphinate ligands present to date. − A small amount of the copper complexes with macrocyclic ligands possessing pendant phosphinate groups are also being studied for potential medical applications. − The formation of insoluble polymeric compounds is commonplace in such systems, which is a factor that limits their potential application as molecular precursors. Typical strategies employed for the isolation of molecular species include the utilization of bulky ligands, ,…”