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Use of Zinc Oxide Nano-photocatalyst as a Recyclable Catalyst for Removal of Arsenic and Lead Ions from Polluted Water
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M.H Moafi    , M* Ardestani * , N Mehrdadi |
| University of Tehran, Tehran, Iran |
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Abstract: (1241 Views) |
Background & objectives: Considering the effects of pollutants of industrial origin, such as heavy toxic metals-containing wastewater, on rivers and surface waters and the importance of their removal, in this study, the preparation, characterization and evaluation of zinc oxide nanophotocatalyst based on magnetic organic-metallic frameworks (ZnO@IL-mSiO2@Cr-MIL-101), abbreviated as ZISM nanophotocatalysts, was evaluated in removing of lead (Pb2+) and arsenic (As3+) metals from aqueous samples.
Methods: This experimental study was performed using a ZnO-based nano-photocatalyst and a reactor consisting of an ultraviolet (UV) source and a reaction chamber for water samples contaminated with lead (Pb2+) and arsenic (As3+). To determine the removal efficiency of contaminants by ZISM nano-photocatalyst, the effect of various parameters including contaminant concentration, amount of nano-photocatalyst, pH and reaction time were investigated.
Results: The results showed that with increasing the amount of ZISM nano-photocatalyst and pH, the removal of lead and arsenic increased. The maximum removal of Pb2+ and As3+ was obtained 99.8 and 98.3, in initial concentration of 5 mg/L, nano-photocatalyst dose of 250 mg/L, pH =8 mg/L and reaction time of 60 min.
Conclusions: According to the results, the ZISM nano-photocatalyst emerged as an efficient and recyclable nano-photocatalyst, which was a potential and environmentally friendly process for the removal of toxic heavy metals as hazardous water pollutants. This photocatalyst showed good recyclability in 5 consecutive periods. |
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| Keywords: Zinc Oxide, Lead, Arsenic, Photocatalyst, Metal Organic Framework |
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Full-Text [PDF 996 kb]
(478 Downloads)
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Type of Study: Research |
Subject:
General
Received: 2021/05/25 | Accepted: 2021/04/30 | Published: 2021/04/30
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