Adsorption characteristics of Copper (II) ion on Cu-doped ZnO nanomaterials based on green synthesis from Piper Chaudocanm L. leaves extract

In this study, Cu-doped ZnO nanomaterials were fabricated by the sol–gel method using the extract of Piper chaudocanum L. leaves and the mixture of Zn (II) and Cu (II) salts. The Cu-doped ZnO nanomaterials changed from the Zn 1−x Cu x O solid solution into the ZnO/CuO nanocomposites with increasing Cu content from 1 to 10%. The monodisperse particles agglomerate into a block; the pyramidal blocks tent to form a longer and narrower in width at high Cu content with increasing porosity and adsorption sites. The pH pzc of ZSCu10 was about 8.8. The Cu (II) adsorption increased with increasing the Cu content while the optimum conditions were found to be pH 7; adsorption time 120 min and adsorption efficiency at 1.0 g/l ZSCu10 or 10 ppm Cu (II) reached about 99%. The adsorption isotherms were fitted well with the Langmuir model while adsorption kinetics followed pseudo-second-order.