Study on Hexavalent Chromium Reduction Using Zero-Valent Magnesium in Aqueous Solution
Abstract:
Introduction
Chromium is an extremely important heavy metal which is used in different industries. It can be found in water resources due to insufficient treatment of industrial wastewater. The goal of this study was to survey the feasibility of application of hexavalent chromium reduction using granular magnesium as reducing agent and to investigate the affects of various operational parameters.
Methods
In this experimental study, zero-valent magnesium was used for the removal of hexavalent chromium from aqueous solution. Synthetic solution of chromium was prepared from dionized water. Several experimental steps was done in 250 ml glass beakers in a shaker incubator device and different operational parameters such as pH of solution, initial concentration of chromium, temperature, contact times, magnesium dose and intercurrent factors were investigated. Concentration changes of chromium were determined with spectrophotometer at an absorbance wavelength of 540 nm.
Results
The results indicated that chromium removal efficiency, using zero-valent magnesium, increases with contact times, magnesium dose, initial concentration of chromium and temperature. However, chromium removal efficiency decreased with increasing pH of solution. The highest removal efficiency was achieved in pH 3, initial concentration of chromium at 150 mg/L and magnesium at dose of 0.7 g/L, respectively. In addition, the presence of humic acid, hardness and alkalinity in solution extensively decreased the chromium removal efficiency.
Conclusion
The results showed that zero-valent magnesium, due to high oxidation and reduction potential, can be extensively effective for removing hexavalent chromium in aqueous solution.
Language:
Persian
Published:
Tolooe Behdasht, Volume:12 Issue:4, 2014
Pages:
202 - 214
magiran.com/p1258983  
روش‌های دسترسی به متن این مطلب
اشتراک شخصی
در سایت عضو شوید و هزینه اشتراک یک‌ساله سایت به مبلغ 300,000ريال را پرداخت کنید. همزمان با برقراری دوره اشتراک بسته دانلود 100 مطلب نیز برای شما فعال خواهد شد!
اشتراک سازمانی
به کتابخانه دانشگاه یا محل کار خود پیشنهاد کنید تا اشتراک سازمانی این پایگاه را برای دسترسی همه کاربران به متن مطالب خریداری نمایند!