University of Kashan Journal of Nanostructures 2251-7871 12 3 2022 07 01 Synthesis and Characterization ZnS-Ni Nanoparticles-Loaded Coconut Shell Activated Carbon for Removal of Crystal Violet: Experimental Design and Optimization 529 545 112045 10.22052/JNS.2022.03.006 EN Parisa Rostami Department of Chemistry, Faculty of Science, Arak Branch, Islamic Azad University, Arak, Iran Tahereh Momeni Isfahani Master of Science Student in Nano Chemistry, Arak Branch, Islamic Azad University, Arak, Iran Farnaz Maghazeii Department of mathematics and physics, Faculty of Science, Arak Branch, Islamic Azad University, Arak, Iran Journal Article 2022 01 18 In this work, we used ZnS-Ni/coco Ac nanocomposite as a cheap adsorbent for the elimination of Crystal Violet (CV) dye from an aqueous medium by an ultrasound-based adsorption method. First ZnS-Ni nanoparticles were synthesized by using the microwave-assisted co-precipitation method. These nanoparticles were then stabilized on activated carbons derived from coconut shells. The ZnS-Ni/coco AC composite was characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmitted electron microscopy (TEM), and energy-dispersive X-ray spectrometry (EDX). WE used response surface methodology (RSM) based on the central composite design (CCD) to study the effects of four various parameters including dye concentration, the amount of adsorbent, sonication time and pH on the process of adsorption. The optimal condition for removal of CV up to 98.96% was achieved for pH=6.31, 0.023 g of adsorbent for 16.06 mg/L dye concentration and sonication time of 5 minutes. Adsorption equilibrium and kinetic data were fitted with the Langmuir monolayer isotherm model (qmax=178.57 mg/g and R2= 0.9925) and like pseudo-second-order kinetics mechanism (R2=0.9994) https://jns.kashanu.ac.ir/article_112045_d0661c32a64a9abf0cb1f87dbbc5c7af.pdf