Characterization of Calcined Lobong Limestone
Sanusi Gugule 1, Deitje Adolfien Katuuk 2, Feti Fatimah 3, and Chaleb Paul Maanari 1

1 Department of Chemistry, Manado State University, Indonesia
2 Department of Education Management, Manado State University, Indonesia
3 Department of Chemistry, Sam Ratulangi University, Indonesia

Abstract

This study aims to produce and characterize CaO (calcium oxide) from limestone which is a natural product of Lobong Village. Calcination is thermal decomposition of limestone to remove carbon so that it can produce calcium oxide. One of the functions of CaO is as environmentally friendly catalyst which does not produce toxic or hazardous waste and it is possible to reuse. CaO resulting from the calcination process at a temperature of 900oC for 1.5 h was characterized using XRD, SEM, FTIR, and EDS. XRD analysis of calcinated limestone produced 2&#952- (h k l) diffraction peaks, namely 32.228o (1 1 1), 37.389o (2 0 0), 53.864o (2 2 0), 64.169o (3 1 1), and 67.404o (2 2 2) which indicates the dominance of CaO. SEM analysis shows that the morphological structure of Lobong limestone after calcination is more porous than before one. Studied by FTIR shows that the chemical bonds of carbonate groups in the calcined limestone is decreasing. EDS analysis also shows that the mapping of carbon which forms carbonate in calcined limestone is decreasing.

Keywords: Calcium Oxide, Limestone, Calcination, XRD, SEM, FTIR, EDS

Topic: Optimization Research Based on Local Resources