Abstract
Indonesia has many zeolite producing areas yet untapped. Researchers developed the utilization of natural zeolites useful for the adsorption of naphthol dyes commonly found in batik waste. In this study researchers used natural zeolites from Purworejo and Ponorogo that are activated using hydrochloric acid that is used for adsorption. The purpose of this research is to know the effect of natural zeolite activation from Ponorogo and Purworejo on the effectiveness of adsorption of naphthol dyes widely used in batik industry. Natural zeolite was activated using HCl concentration of 1.3N; 1.8N; 3.2N; and 3.9N for 60 minutes. The methods are preparation of natural zeolite from Purworejo and Ponorogo, dealumination using hydrochloric acid, adsorption process of naphthol dyes using activated zeolite, and test of adsorption result with uv-vis spectrophotometry. The test results showed that the higher HCl concentration will increase adsorption capacity. This can be known from the concentration of naphthol dye which decreased both using natural zeolite Ponorogo and Purworejo. While the effectiveness of adsorption shows natural zeolite Purworejo has a greater adsorption capacity than Ponorogo with optimum conditions of dealumination using concentration HCl 3,9N.
Highlights
One of the most developed industries in Indonesia is batik industry
The purpose of this study is to examine the effect of HCl concentration in the zeolite adsorbent activation process on the effectiveness of naphthol adsorption dyes
After that the solution was filtered to separate the filtrate, the filtrate was measured its absorbance by UV-VIS Spectrophotometer, calculated the final concentration of the naphthol dye after adsorption process
Summary
One of the most developed industries in Indonesia is batik industry. Batik industry in 2006 amounted to 48,287 business units spread over 17 provinces, and employed 792,300 people [1]. The main source of waste in the batik industry is dyes, which are contain naphthol dyes. Natural zeolite is a group of minerals produced from hydrothermal processes in alkaline igneous rocks, and is a precipitate of volcanic activity which contains many silica elements [2]. Zeolites occur naturally on the soil surface. Today many types of natural zeolites have been found and grouped by their structural similarity. Synthetic zeolites have been produced, natural zeolites have an important role because of their abundant availability in nature, especially in Indonesia
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