Preparation of Adsorbent for Mercury Ion and Sulfide Ion from Waste Tire Rubber
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Abstract
Waste tires tends to cause grave environment problems because the number of used tires arise annually while rubber tyres are not eco-friendly as they are non-biodegradable. In this study, waste tire rubber was modified to be an adsorbent by using oxidation reaction in the mixture of the HNO3/NaNO2 (1.0% w/v.) system. Waste tire rubber was modified at 30°C for 4 hours with different volumes of HNO3 (20 to 40 ml). The optimum condition was the use of 35 ml HNO3 that showed the highest carboxyl content (1.26 mmol/g). SEM images demonstrated that the porosity of raw waste tire rubber increased after the modification. BET surface area showed that the surface area of the modified waste tire rubber was 215 times larger than that of raw waste tire rubber. %CHNS/O analysis revealed that %O increased after the oxidation reaction. FT-IR revealed that the carboxyl group or carbonyl group was successfully introduced into the modified waste tire rubber. In case of mercury ion adsorption, the maximum capacities from Langmuir isotherm of raw waste tire rubber and the modified waste tire rubber were 7.07 and 4.33 mg/g, respectively. Moreover, the maximum sulfide ion adsorption capacities of both adsorbents were 22.47 and 123.46 mg/g, respectively.
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