Enhancing the effect of zinc oxide on the absorption of heavy metals from wastewater by using silica in graphene bed
سال انتشار: 1398
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 49
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شناسه ملی سند علمی:
JR_AMECJ-2-4_002
تاریخ نمایه سازی: 14 آذر 1402
چکیده مقاله:
In this study, the effects of nanostructure absorbent of zinc oxide (ZnO) in graphene
bed for wastewater treatment were studied. Initial analysis was undertaken to
identify the existing metals and their concentration in the prepared wastewater. It
was seen that the diluted solution consisted of the ambivalence ions of lead, copper,
nickel, cadmium, and silver with the concentration of ۷۳.۳۱, ۸۱.۱۹, ۵۴.۶, ۹۸.۱and
۷۶.۱ milligram per liter, respectively. Trivalent chrome, with a concentration of
۹۸.۱ milligram per liter was also observed. Therefore, by adding various amounts
of absorbent (۲۰, ۳۰ and ۵۰ mg) to the wastewater sample and adjusting the pH
to ۵ and ۶, each metal was separately absorbed. Consequently, the concentration
of the remaining metals was measured, and it was observed that absorbent was
effective for the absorption of lead, copper and silver (with a reduction of up to
۸۰%), however, the absorbent was weak in the absorption of nickel and chrome.
Hence, the silicon nanoparticles added to absorbent and the experiments repeated.
It was observed that the presence of silicone resulted in higher absorption of nickel
and chrome but negatively affected the absorption of copper and silver. Electrical
charges at lower pH’s have an inverse impact on the absorption of metal ions that
is due to the electrostatic repelling forces between the positive charges. In more
acidic solutions, the carbonyl groups in the surface of composite create positive
charges and hence repel the metal ions. Hence, the performance of the absorbent
improves by reducing the acidity of the solution. At the pH of six, the number of
hydroxide increases and the capacity of absorbing metal cations increase.
کلیدواژه ها:
نویسندگان
Ahmad Ghozafloo
Research Institute of Petroleum Industry (RIPI), West Blvd. Azadi Sport Complex, P.O. Box: ۱۴۶۶۵-۱۳۷, Tehran, Iran
Atefeh Enayatollahi
Research Institute of Petroleum Industry (RIPI), West Blvd. Azadi Sport Complex, P.O. Box: ۱۴۶۶۵-۱۳۷, Tehran, Iran