Speciation and removal of selenium (IV, VI) from water and wastewaters based on dried activated sludge before determination by flame atomic absorption spectrometry
عنوان مقاله: Speciation and removal of selenium (IV, VI) from water and wastewaters based on dried activated sludge before determination by flame atomic absorption spectrometry
شناسه ملی مقاله: JR_AMECJ-4-1_003
منتشر شده در در سال 1400
شناسه ملی مقاله: JR_AMECJ-4-1_003
منتشر شده در در سال 1400
مشخصات نویسندگان مقاله:
Mahdiyeh Ghazizadeh - Department of Chemistry, Kerman Branch, Islamic Azad University, Kerman, Iran, P. O. Box ۱۶۷-۷۶۳۵۱۳۱
Abdollah Abbasloo - Department of Chemistry, Kerman Branch, Islamic Azad University, Kerman, Iran, P. O. Box ۱۶۷-۷۶۳۵۱۳۱
Farzaneh Bivar - Department of Chemical engineering, Sirjan Branch, Islamic Azad University, Kerman, Iran, P.O. Box ۱۸۷-۷۸۱۸۵
خلاصه مقاله:
Mahdiyeh Ghazizadeh - Department of Chemistry, Kerman Branch, Islamic Azad University, Kerman, Iran, P. O. Box ۱۶۷-۷۶۳۵۱۳۱
Abdollah Abbasloo - Department of Chemistry, Kerman Branch, Islamic Azad University, Kerman, Iran, P. O. Box ۱۶۷-۷۶۳۵۱۳۱
Farzaneh Bivar - Department of Chemical engineering, Sirjan Branch, Islamic Azad University, Kerman, Iran, P.O. Box ۱۸۷-۷۸۱۸۵
In recent decades, large amount of pollutants enters to the environment
due to development of technology. Therefore, it is necessary to use
ecofriendly sorbent to eliminate pollutants. In this research, ۰.۵ g of
a dried activated sludge (DAS) was used for speciation selenium and
removal of selenite [Se(IV)] from water and wastewater samples.
The effect of operating parameters such as solution pH, the amount
of bio-sorbent, contact time, temperature and initial concentration
of selenium were studied by flame atomic absorption spectrometry
(F-AAS). Kinetic data was adjusted to the Langmuir and Freundlich
kinetic equations. The resulted showed that the Langmuir equation
with a correlation coefficient of ۰.۹۸۲۵ has the best match to
tetravalent selenium biosorption on DAS. The FT-IR results showed
that the biosorption mechanism of Se(IV) on DAS is due to functional
groups on the DAS surface (Se(IV)…. DAS). For reduction of soluble
selenate [Se(VI), SeO۴
۲−] to selenite [Se(IV), SeO۳
۲−], the concentrated
HCl was used at ۷۰oC (۳۰ min). So, the Se(VI) reduced to Se(IV)
and total selenium (TSe) was determined and the Se (VI) was simply
calculated by difference of TSe from Se(IV) content. The method was
validated based on spiking samples in water and wastewater samples
by F-AAS and using HG-AAS.
کلمات کلیدی: Selenium, Water and wastewater, Speciation, Activated sludge, Biosorption, Isotherms
صفحه اختصاصی مقاله و دریافت فایل کامل: https://civilica.com/doc/1841487/