查看文章

Green synthesis ultrasonic method is reported for the preparation of zinc oxide nanoparticles loaded on activated carbon (AC) derived from coffee waste. The zinc modified AC was used effectively for the elimination of malachite green (MG) from wastewater. The examined batch adsorption parameters are; initial pH (2–9), adsorbent dose (0.10–0.50 g/100 mL), mixing time (5–120 min), MG concentrations (25–300 mg/L) and temperature (298–318 K). XRD, SEM/EDS, FT-IR and TGA/DTA techniques were used to characterize the developed Zn (OH) 2-AC composite. The results demonstrated that the adsorption capacity of Zn (OH) 2-AC composite was improved with incremental of the initial dye concentration, pH, and temperature, and decreased as the Zn (OH) 2-AC composite dose was increased. The Langmuir isotherm model (R 2= 0. 97) showed better conventionality than the Freundlich model (R 2= 0. 80) with a …