REMOVAL OF INORGANIC CONTAMINANTS FROM AQUEOUS SOLUTIONS USING FIBROUS CLAY-SUPPORTED ZERO-VALENT IRON NANO-PARTICLE COMPOSITES

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BAKHTIARI SOMAYEH; CHOGHADI SINA

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Journal: Environmental Sciences Year:2018 | Volume:15 | Issue:4 Page(s): 45-64

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Title

REMOVAL OF INORGANIC CONTAMINANTS FROM AQUEOUS SOLUTIONS USING FIBROUS CLAY-SUPPORTED ZERO-VALENT IRON NANO-PARTICLE COMPOSITES

Author(s)

BAKHTIARI SOMAYEH | CHOGHADI SINA | Issue Writer Certificate

Keywords

PALYGORSKITEQ1

SEPIOLITEQ2

PHOSPHOROUSQ2

CADMIUMQ2

NICKELQ2

Abstract

Introduction: In recent years, zero-valent iron has drawn a great deal of attention in wastewater treatment and ground water remediation. It can effectively remove priority water contaminants, but there are some disadvantages in the use of nZVI particles, such as a high tendency to agglomerate, lack of stability, secondary iron pollution, separation and recovery of the fine nZVI particles after utilization. Using supporting material for nZVI is a promising way to solve these problems. Clay minerals as abundant natural resources are appropriate candidates to act as supporting materials. In this study, the use of fibrous clays-supported nZVI composite for the remediation of contaminated aqueous solutions will be discussed.Materials and methods: SEPIOLITE and PALYGORSKITE nano zero-valent iron composites were made using green tea extract. In order to determine the sorption capacity of nZVI, SEPIOLITE and PALYGORSKITE composites for PHOSPHOROUS, CADMIUM and NICKEL based on isotherm models, different concentrations of these ions were equilibrated with the composites in 1% suspensions for 24 hours. After adsorption, the supernatant liquids were filtered and the residual pollutant concentrations were determined.Results and discussion: Results showed that Langmuir and Freundlich were the best models for describing p sorption on both composites. The estimated maximum adsorption capacity of the Sep-nZVI and Pal-nZVI using the Langmuir model (qmax) was 11.38 mg P/g and 8.57 mg P/g. The CADMIUM adsorption data for both sorbents was best fitted to the Langmuir, Fruendlich and Dubinin–Radushkevich models. Results clearly demonstrated the much higher Cd sorption potential of SEPIOLITE compared with PALYGORSKITE. The sorption capacities (qmax) of SEPIOLITE-nZVI and PALYGORSKITE nZVI composites for Ni were 11.14 and 32.3 mgr/gr, respectively. The Ni sorption affinity (KL) of PALYGORSKITE nZVI was also greater than that of SEPIOLITE-nZVI. The favourability of a sorption system can be predicted by the constant separation factor RL. In the currentstudy, RL values for PALYGORSKITE nZVI and SEPIOLITE-nZVI were greater than zero and less than unity, indicating favourable sorption of P, Cd and Ni onto the two composites.Conclusion: Fibrous clays and nano zero-valent iron can be used as efficient sorbents for phosphorus removal from urban wastewater and the removal of CADMIUM and NICKEL from industrial wastewater due to their environmentally friendly nature and high performance in pollutant removal.

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APA: Copy

BAKHTIARI, SOMAYEH, & CHOGHADI, SINA. (2018). REMOVAL OF INORGANIC CONTAMINANTS FROM AQUEOUS SOLUTIONS USING FIBROUS CLAY-SUPPORTED ZERO-VALENT IRON NANO-PARTICLE COMPOSITES. ENVIRONMENTAL SCIENCES, 15(4 ), 45-64. SID. https://sid.ir/paper/117723/en

Vancouver: Copy

BAKHTIARI SOMAYEH, CHOGHADI SINA. REMOVAL OF INORGANIC CONTAMINANTS FROM AQUEOUS SOLUTIONS USING FIBROUS CLAY-SUPPORTED ZERO-VALENT IRON NANO-PARTICLE COMPOSITES. ENVIRONMENTAL SCIENCES[Internet]. 2018;15(4 ):45-64. Available from: https://sid.ir/paper/117723/en

IEEE: Copy

SOMAYEH BAKHTIARI, and SINA CHOGHADI, “REMOVAL OF INORGANIC CONTAMINANTS FROM AQUEOUS SOLUTIONS USING FIBROUS CLAY-SUPPORTED ZERO-VALENT IRON NANO-PARTICLE COMPOSITES,” ENVIRONMENTAL SCIENCES, vol. 15, no. 4 , pp. 45–64, 2018, [Online]. Available: https://sid.ir/paper/117723/en

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