Adsorption of nitrate from aqueous solution with ZSM-۵/Fe nanosorbent based on optimizing of the isotherms conditions before determination by UV-Vis Spectrophotometry
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نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_AMECJ-4-4_003
تاریخ نمایه سازی: 14 آذر 1402
Abstract:
The life-threatening nature of high nitrate concentrations in various
water resources motivated the present study to investigate the nitrate
adsorption by ZSM-۵ nanozeolite and the feasibility of increasing
nitrate removal efficiency using iron-doped ZSM-۵ (ZSM-۵/Fe)
nanoadsorbent. The optimal adsorption conditions were determined
first by modeling the central composite design (CCD) using Design
Expert.۷ software based on four influential factors of contact time,
pH, adsorbent dosage and initial nitrate concentration. Then, the
isotherms of nitrate adsorption under optimized conditions were
investigated using the degree of fit of experimental data with
Langmuir and Freundlich models for mathematical modelling of
the nitrate adsorption process. Based on the test design results, the
highest nitrate removal efficiency (%۹۳.۱) was determined with UVVis
spectrophotometry at the contact time of ۱۵۰ min, pH value of
۳, the adsorbent dosage of ۴ g L-۱ and initial concentration of ۴۰ mg
L-۱. Analysis of adsorption isotherms also confirmed the greater fit
of the experimental data with the Freundlich equation, so that the
correction factor of the Freundlich equation was greater than the
Langmuir equation, due to the heterogeneous distribution of active
sites for adsorption on the ZSM-۵/Fe nanosorbent surface. Therefore,
it can be concluded that ZSM-۵/Fe is a high efficiency nanosorbent
for nitrate removal from water resources.
Keywords:
Authors
Mostafa Hassani
Department of Applied Chemistry, Faculty of Science, Islamic Azad University, South Tehran Branch,Tehran, Iran
Mohsen Zeeb
Department of Applied Chemistry, Faculty of Science, Islamic Azad University, South Tehran Branch,Tehran, Iran
Amirhossein Monzavi
Department of Polymer and Textile Engineering,Islamic Azad University,South Tehran Branch,Tehran, Iran
Zahra Khodadadi
Department of Applied Chemistry, Faculty of Science, Islamic Azad University, South Tehran Branch,Tehran, Iran