International Journal of Eco-Innovation in Science and Engineering Vol 3 (01), 2022 (35-40) https://ijeise.upnjatim.ac.id/ E-ISSN: 2721-8775 E-ISSN: 2721-8775/ijeise.upnjatim.ac.id/ 35 Article Synthesis and Modification of Nano-Precipitated Calcium Carbonate (PCC) with Addition of Ethylene Glycol Sani 1* , Mega Rosilina 1 , Mochamad Titus Maulana 1 , A.R.Yelvia Sunarti 1 , Srie Muljani 1 , and Dwi Hery Astuti 1 , Isni Utami 1 1 Department of Chemical Engineering, Faculty of Engineering, Universitas Pembangunan Nasional “Veteran” Jawa Timur, Surabaya 60294, Indonesia *Corresponding author: sanisjamsu@gmail.com |Phone number: +62813 32452800 Received: 21 st February 2022; Revised: 22 nd April 2022; Accepted: 18 th May 2022; Available online: 19 th May 2021; Published regularly: May and November. Abstract ZA fertilizer waste (Ammonium sulfate) is waste generated from the industrial process of producing ZA fertilizer. The waste contains very high calcium and has the potential to be used as a raw material in the manufacture of Precipitated Calcium Carbonate (PCC). PCC with certain qualities can be developed in the field of advanced materials, with size modification into nanoparticles. One method to produce nanoparticles is using the coprecipitation method, with the help of a polymer solution. This study aims to produce Nano-PCC by finding the best conditions of CaCl2: Ethylene Glycol mole ratio and stirring speed. Nano-PCC is synthesized by reacting fertilizer waste with HCl to form a CaCl 2 solution. Then, the solution is mixed with ethylene glycol to prevent particle agglomeration so that the size obtained will be smaller. The mixture is then reacted with Na2CO3 to form precipitated calcium carbonate (PCC). In this study, the variables were the mole ratio of CaCl 2: ethylene glycol (1:12, 1:14, 1:18, 1:20) and stirring speed (350, 500, 650, 800, and 950 rpm). Based on PSA analysis, the Nano-PCC obtained at the smallest CaCl2: ethylene glycol ratio 1:12, stirring speed 950 rpm was 51.83 nm. Based on Scherrer’s calculations with XRD, the particle size obtained was 48.25 nm. SEM analysis showed that the crystals formed were dominated by vaterite crystals, with a size range of 55.71-607.79 nm. Keywords: ZA fertilize waste, Nano Precipitated Calcium Carbonate (PCC), Coprecipitation, Ethylene Glycol 1. Introduction ZA fertilizer waste (Ammonium Sulfate) is waste generated from the industrial process of producing ZA fertilizer. The amount of ZA fertilizer waste increases along with the increase in ZA fertilizer production in Indonesia. From several studies, ZA waste produced is known to contain high calcium, amounting to 92.52%. Therefore, ZA fertilizer waste has the potential as raw material for Precipitated Calcium Carbonate (PCC) manufacture. Precipitated Calcium Carbonate (PCC) is a widely studied material. The versatility and design of CaCO3 particles have aroused considerable interest in both the scientist and the industrial community due to their wide field of applications and biocompatibility. PCC is widely used as filler in paints, pigments, plastics, fibres and cement, according to its characteristics, such as morphology and size [1]. PCC has been widely used in various fields of health, food, and industry. Generally, PCC has a particle size from 0.1 to 3 m. PCC with certain qualities can be developed as an advanced material, by turning it into nanoparticles. The synthesis of nanoparticles can change the properties and functions of a material. The research of [2] stated that the addition of Nano PCC can increase the tensile strength and