In the present work, nano-particles of potassium substituted hydroxyapatite with formula of -Ca2.94K2.06--PO4-0.94-CO3-2.06-OH- -KHA- is reported showing effective adsorption of Congo red dye in the room temperature. Synthesized sol-gel-derived KHA was identified by XRD, FTIR, TGA/DTA, and EDXA analysis. Moreover, the size of nano-particles and micro-strain of the synthesized KHA were measured using Williamson-Hall -W–H- plots and TEM in amount of 65–70 nm. The capacity of equilibrium adsorption -qm- for 100 ppm of Congo red was evaluated as high as 505.19 mg g–1 under optimum conditions. The adsorption charts and kinetic results obtained at ambient conditions well fitted with the Langmuir equation and the pseudo–first–order model with correlation coefficients of 0.9939 and 0.9867, respectively. The obtained results obviously show that the new synthesized KHA can be used for industrial wastewater purification in a good manner. The title nano-material also shows excellent antibacterial activity as highly prevention of bacteria strains growth with the lowest concentration of 125 µg/mL.

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