Optimization of Nitrate and Nitrite Anions Adsorption on Modified Silica using Batch Method

Abstract

Ammonia inorganic compounds are compounds that are often found because it is soluble in ground water which causes health hazards that are carcinogenic, mutagenic, tetratogenic and cause metamoglobinemia. Ammonia compounds that have negative effects on humans are nitrate and nitrite anions. Disposal of liquid waste and the use of fertilizers cause nitrates and nitrites to dissolve so that it has a negative impact on groundwater. One of the efforts to overcome nitrate and nitrite in waste is by adsorping with adsorbent., where the adsorbent used is DMA modified silica. Characterization by adsorption of nitrites and nitrates from aqueous solution at various pH, concentrartions, and contact times. The result showed that silica modification with DMA increased the adsorption capacity of nitrates and nitrtites. The Langmuir isotherm yields a regression coefficient R2 = for 0.9809 for nitrate and 0.9469 for nitrite. Nitrate adsorption capacity of 0.1669 mg g-1 with an initial nitrate concentration of 60 ppm at pH 8 with stirring for 120 minutes while the maximum adsorption capacity of nitrite was 0.1669 mg g-1 with an initial nitrite concentration of 40 ppm at pH 6 with stirring for 120 minutes.