Hydrothermal tuning of the morphology and particle size of hydrozincite nanoparticles using different counterions to produce nanosized ZnO as an efficient adsorbent for textile dye removal

摘要: The current study aimed to investigate the effect of counterions on hydrothermally synthesized hydrozincite (zinc hydroxide carbonate), which was thermally converted generate ZnO nanostructures, are an efficient nanoadsorbent for removal Reactive Black 5 (RB5) dye from wastewater. Hydrozincite nanospheres and flower-like structures were prepared using various zinc salts (sulfate, acetate, nitrate) ammonium carbonate in a molar ratio 1:3, respectively, at 120 °C 3 h. morphology crystallite size precursor effectively controlled via parameters hydrothermal reaction. Interestingly, sulfate optimum counterion, as salt produced pure with smallest (∼13.57 nm), consequently decomposed 400 1 h produce nanosized (∼10 nm). compositions as-synthesized products determined by means FT-IR, FE-SEM, HR-TEM, XRD, zeta potential, BET, thermal analyses. An adsorption showed much higher capacity (80.9 mg g−1) as-prepared nanoparticles toward RB5 dye. followed pseudo-second-order kinetics. In addition, equilibrium best described Langmuir isotherm model calculated thermodynamic parameters, ΔG0 (from −4.027 −7.533 kJ mol−1), ΔH0 (30.798 Ea (29.105 indicate spontaneous, endothermic, physisorptive nature process.