توضیحات :
Journal of Advances in Environmental Health Research
Volume 5, Issue 4, Autumn 2017
Authors : Majid Hashemi , Mohammad Mehdi Amin , Sepideh Sadeghi , Nezamaddin Mengelizadeh , Farzaneh Mohammadi , Saeed Patastar , Afsaneh Chavoshani, Shima Rezaei
Abstract :
Chromium enters surface and ground waters through the wastewater of electroplating, textile, metallurgical, dye production, and other industries, leading to numerous adverse health effects. The potential property of nanoparticle adsorption of nickel oxide (NiO) and the economic nature of ultraviolet/hydrogen peroxide (UV/H۲O۲) process have eased the usage of these two processes for chromium removal. In this study, the parameters including chromium concentration, pH, and NiO dosage were examined by the adsorption process. Furthermore, following the separation of NiO nanoparticles by magnet and filtration, in UV/H۲O۲ reactor, the effects of H۲O۲ concentration, radiation time, and pH were studied on the removal efficiency. In the reactor containing NiO, with an increased dose of NiO from 0.2 to 1 g, the removal efficiency increased from 26 to 76%. Moreover, at different pHs (3, 5, 7, and 11) and reaction times (10, 20, 30, and 40 min), the maximum efficiency of 79% was obtained at pH = 3 and reaction time of 40 min. The isotherm of the adsorption followed the Langmuir model. In the UV/H۲O۲ reactor, elevation of H۲O۲ concentration from 20 to 100 µmol resulted in an elevated chromium removal efficiency at pH = 3 from 35 to 95%. In this process, pH = 3 was chosen as the optimum pH. The results indicated that the removal efficiency is highly influenced by pH, reaction time, dose of NiO nanoparticles, and H۲O۲. By optimizing the effective parameters, this process can be used to remove chromium in aqueous solutions.
Keyword : Chromium, Hydrogen peroxide, Industrial wastewater, Nickel oxide nanopowder, Ultraviolet
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