Modified Yogyakarta natural zeolites as adsorbent for removal toxic gas in shrimp pound water Available to Purchase

One of the adsorbents of natural materials is zeolite. Natural zeolite needs to be activated first one of them with dealumination and calcination so that it is expected to increase its adsorption power. Natural zeolites need to be modified because they generally have not very high thermal stability, not uniform pore size and low catalytic activity so modifications need to be made to improve the adsorption and catalytic properties of natural zeolites. In this study used natural zeolite from Yogyakarta because it has a high enough silicate compound content so it is suspected to have high adsorption capability. Modification of zeolite in the form of dealumination namely with sulfuric acid (H₂SO₄) and calcination. The research began with the preparation of tools and materials, the initial analysis of pond (tambak) water quality was continued by activation of zeolite using sulphuric acid solution, followed by calcination process. The results showed that modified zeolite is more effective for NH₄⁺ and NO₂⁻ absorption than oven/non-modified zeolite. The highest NH₄⁺ and NO₂⁻ removal percentages were 51.28% and 100% respectively on variable Z6 with H₂SO₄ concentration of 0.8 M and dealumination time of 6.8 hours. Modified zeolites have a longer stay time to reach the equilibrium point so that they can absorb NH₄⁺ and NO₂⁻ more.