Vol. 6, Issue 8 (2019)
Removal of heavy metals from industrial wastes of Mobarakeh Isfahan steel with tomato pulp
Author(s): Sifatullah Shakir, Allah Nazar Atif, Sayed Attaul Haq Banuree
Abstract: The demand for clean water is increasing due to population growth. One of the ways to solve the problem of water scarcity is to treat contaminated water through the removal of pollutants. The use of adsorbents to remove pollutants is one of the promising methods. Tomato pomace is a plant waste, and in this study, its adsorption potential for selected pollutants in water was studied. We report the performance of tomato peel before and after correction with ethylene diamine (EDA) on the adsorption of copper, lead, and cadmium in aqueous solution. The content of the adsorbed substance was 5.27 mg.g-1, 2.12 mg.g-1 and 2.16 mg.g-1 2.16, respectively, for Cu, Cd and Pb with modified adsorbent, respectively. For unbleached adsorbent, the amounts of mg.g-1 were 3.29 mg.g-1 4.57 and 1.05 mg.g-1 were reported. The pH for maximum absorption was between pH 4 and pH 6. In a separate study, it was determined that g0.1 was washed out of dried tomato pellets, 20 mg of solvent organic carbon (DOC), using ml of distilled disintegrated distilled water. The solution was green. The leach process causes secondary contamination. Reducing tomato pomace with EDA reduced the content of the DOC by half (50%), and removed the green color. Kinetic studies showed that the absorbent could absorb 95% of the metal in less than 10 minutes (in standard synthetic solution). Then, the adsorbed metals were removed from HNO3 using M0.5 solution, indicating that the adsorbent can be regenerated. In addition, this study showed that the reform improved the absorbent thermal stability so that, even when the temperature increased to 1000˚C, more than 80% of the modified adsorbent (as compared to 50% of the unpolished tomato pumice) did not break down, indicating that These modifications have had a significant impact on the thermal stability of tomato scum.