EFFECT OF MIXED ANIONS (HCO3-, SO42-, CLO4-, CL-, NO4-) ON FE0 NANOPARTICLES REACTIVITY IN BATCH REACTOR EXPERIMENTS

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Nozad Narges; MOHAMMADZADEH AKBAR

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Seminar Paper

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Seminar: IRANIAN CHEMISTRY CONGRESS
Year:2014 | Issue:17

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Title

EFFECT OF MIXED ANIONS (HCO3-, SO42-, CLO4-, CL-, NO4-) ON FE0 NANOPARTICLES REACTIVITY IN BATCH REACTOR EXPERIMENTS

Author(s)

Nozad Narges | MOHAMMADZADEH AKBAR | Issue Writer Certificate

Keywords

FE0 NANOPARTICLES

MIXED ANIONS

REACTIVE NAVY BLUE SP-BR

Abstract

BACKGROUND: THE COMBINATION OF COLORED WASTEWATER IS VERY COMPLEX. THESE WASTEWATERS CONTAIN A VARIETY OF INORGANIC SALTS SUCH AS SULFATE, CHLORIDE AND CARBONATE SALTS WHICH ARE USED AS A BUFFER. IN THIS PROJECT THE EFFECT OF MANY HIGH USED SALTS, SUCH AS SULFATE, CHLORIDE, NITRATE, PERCHLORATE, CARBONATE, AND SODIUM BICARBONATE HAS BEEN INVESTIGATED ON DECOLORIZATION PROCESS BY ZERO IRON NANOPARTICLES. BECAUSE THE EFFECT OF PERCHLORATE IS NEGLIGIBLE ON ZERO IRON ACTIVITY [1], THE IRON SOLUTION CONTAINING PERCHLORATE IS USED AS A WITNESS (TO EQUAL IONIC STRENGTH OF THE SOLUTION) IN THE ASSESSMENT OF IRON SOLUTION CONTAINING OTHER ANIONS.METHODS: TO PERFORM THESE EXPERIMENTS, THE REACTIVE NAVY BLUE SP-BR DYE SOLUTION WITH A CONCENTRATION OF 20 MG L-1 AND THE IRON NANOPARTICLES WITH A CONCENTRATION OF 150MG L-1 WERE USED. CONCENTRATIONS OF VARIOUS ANIONS IN SOLUTION WERE EQUAL TO THE 100 MG L-1. IN THIS STUDY, ZERO IRON NANOPARTICLES WERE SYNTHESIZED BY CHEMICAL DEPOSITION METHOD.RESULTS: THE EFFECT OF ANIONS ON THE ACTIVITY OF ZERO IRON NANOPARTICLES WAS STUDIED AT PH=6. DECOLORIZATION EFFICIENCY AT 15, 30, 45, 60 AND 90 MIN, IN THE PRESENCE OF PERCHLORATE WAS EQUAL TO 58, 80, 85, 89 AND 91%, RESPECTIVELY. DECOLORIZATION EFFICIENCY AT THE SAME TIMES FOR CHLORIDE WAS 55, 70, 82, 85, 90% AND FOR NITRATE WAS 38, 53, 60, 64, 66% AND FOR BICARBONATE WAS 33, 40, 45, 49 AND 50% RESPECTIVELY.CONCLUSION: THE ANIONS WERE RANKED: SO42-<CL-<CLO4-<NO3-<HCO3-(FROM MOST ENHANCED TO MOST INHIBITED, WITH INITIAL PH 6). THE CARBONATE AND BICARBONATE ACTS AS AN OXIDIZER AND CAUSED TO DISSOLUTION THE FE0 TO FE 2+ AND BY FORMATION THE PRECIPITATES SUCH AS IRON CARBONATE (FECO3) AND (FE2 (CO3) (OH) 2), LEADS TO FORMATION A PASSIVE LAYER THAT COVERED THE ACTIVE SITES ON THE SURFACE OF IRON NANOPARTICLES AND REDUCED THEIR ACTIVITY [2]. ALSO NITRATE BY CONSUMPTION ZERO IRON AND CONVERTED TO AMMONIUM COMPETES WITH POLLUTANT AND THUS REDUCES THE EFFICIENCY OF DECOLORIZATION. CHLORIDE AND SULFATE IONS HAVE BEEN IDENTIFIED AS ENHANCING OF CORROSION AND PROBABLY BY INCREASE IN IRON CORROSION RATE CAN INCREASE THE DECOLORIZATION REACTION RATE [3].

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APA: Copy

Nozad, Narges, & MOHAMMADZADEH, AKBAR. (2014). EFFECT OF MIXED ANIONS (HCO₃^-, SO₄^2-, CLO₄^-, CL^-, NO₄^-) ON FE⁰ NANOPARTICLES REACTIVITY IN BATCH REACTOR EXPERIMENTS. IRANIAN CHEMISTRY CONGRESS. SID. https://sid.ir/paper/913517/en

Vancouver: Copy

Nozad Narges, MOHAMMADZADEH AKBAR. EFFECT OF MIXED ANIONS (HCO₃^-, SO₄^2-, CLO₄^-, CL^-, NO₄^-) ON FE⁰ NANOPARTICLES REACTIVITY IN BATCH REACTOR EXPERIMENTS. 2014. Available from: https://sid.ir/paper/913517/en

IEEE: Copy

Narges Nozad, and AKBAR MOHAMMADZADEH, “EFFECT OF MIXED ANIONS (HCO₃^-, SO₄^2-, CLO₄^-, CL^-, NO₄^-) ON FE⁰ NANOPARTICLES REACTIVITY IN BATCH REACTOR EXPERIMENTS,” presented at the IRANIAN CHEMISTRY CONGRESS. 2014, [Online]. Available: https://sid.ir/paper/913517/en