A new effective nano-adsorbent and antibacterial material of hydroxyapatite

In the present work, nano-particles of potassium-substituted hydroxyapatite with formula of (Ca2.94K2.06)(PO4)(0.94)(CO3)(2.06)(OH) (KHA) are 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 analyses. 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 (q(m)) 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 strain growth with the lowest concentration of 125 mu g/mL.